Battery modules and battery packs

Abstract

The present invention discloses a battery module, which includes: a plurality of battery cells and a heat dissipation unit. The battery cells are arranged parallel to each other and closely connected to form a structurally stable battery pack structure; the heat dissipation unit is arranged at the electrical connection ends of the battery cells, and the heat dissipation unit can avoid the electrodes of the battery cells and is attached to the corresponding end face of each battery cell; the heat dissipation unit includes a heat conducting plate and a cover plate, the bottom surface of the heat conducting plate is connected to the end face of the electrical connection ends of the battery cells, so that when the battery module is in operation, the heat generated by each battery cell can be transferred to the heat conducting plate through its electrical connection end for heat dissipation; the bottom surface of the cover plate corresponds to the top surface of the heat conducting plate, so that the cover plate can be correspondingly buckled to the top side of the heat conducting plate. The battery module of the present invention can conduct heat and dissipate heat from the battery cells through the heat dissipation unit.

Description

Technical Field

[0001] The present invention relates to the technical field of battery modules, and in particular to a battery module. Background Art

[0002] A battery module is a battery unit composed of multiple individual batteries (also known as cells) connected in series and / or parallel. It is a critical energy storage unit in lithium-ion batteries, electric vehicles, energy storage systems, and other electronic devices. By combining multiple cells into a single unit, a battery module enables the storage and release of energy. Specifically, a battery module absorbs electrical energy and stores it in a chemical form. Connecting cells in series increases the voltage, while connecting cells in parallel increases the module's energy capacity to provide the power required by the device. Furthermore, a battery management system (BMS) monitors the voltage, temperature, and other conditions of each cell in real time to prevent overcharging, overdischarge, or overheating. A battery module typically consists of individual batteries, a battery management system (BMS), a bracket and mounting frame, a thermal management system, connectors, and a protective casing. The thermal management system typically includes components such as liquid cooling, air cooling, or a vapor chamber, and, under the control of the BMS, prevents the battery from overheating or overcooling during use. A battery pack, a complete energy storage and output device consisting of multiple battery modules, is used to provide power to a device or system. It is one of the core components in modern energy storage and power supply systems and is widely used in electric vehicles, energy storage systems, consumer electronic devices and other fields.

[0003] To ensure that the battery module has sufficient heat dissipation performance, existing battery modules and the battery packs they consist of usually use liquid cooling to manage battery thermal performance. Based on this, the battery pack needs to be equipped with a liquid cooling plate and a coolant circulation device to achieve the liquid cooling function of the battery module, or the battery module is wrapped with phase change material to achieve heat dissipation of the battery pack. However, this type of heat dissipation method greatly increases the overall weight of the battery module, which is not conducive to weight-sensitive application scenarios. Summary of the Invention

[0004] Based on this, it is necessary to provide a battery module to address the technical problem that the existing battery module heat dissipation mechanism is heavy.

[0005] A battery module includes a plurality of battery cells and a heat dissipation unit. The battery cells are arranged in parallel and closely connected to form a structurally stable battery pack structure. The heat dissipation unit is arranged at the electrical connection ends of the battery cells. The heat dissipation unit can avoid the electrodes of the battery cells and is attached to the corresponding end face of each battery cell.

[0006] The heat dissipation unit includes a heat conducting plate and a cover plate. The bottom surface of the heat conducting plate is connected to the end faces of the electrical connection ends of several battery cells. Therefore, when the battery module is running, the heat generated by each battery cell can be transmitted to the heat conducting plate through its electrical connection end for heat dissipation. The bottom surface of the cover plate corresponds to the top surface of the heat conducting plate. Therefore, the cover plate can be correspondingly buckled to the top side of the heat conducting plate, and a heat dissipation duct is formed between the cover plate and the heat conducting plate to guide the airflow flowing through the heat dissipation unit.

[0007] The heat conducting plate is provided with a plurality of avoidance holes, a plurality of first heat dissipation parts, a plurality of second heat dissipation parts and a plurality of third heat dissipation parts; the plurality of avoidance holes are corresponding to the plurality of positive ends and the plurality of negative ends of the plurality of battery cells and are arranged through the heat conducting plate, thereby forming two rows of avoidance structures arranged in parallel along the arrangement direction of the battery cells; the plurality of first heat dissipation parts respectively correspond to the plurality of battery cells one by one and are arranged between the two rows of avoidance holes, and the plurality of first heat dissipation parts are arranged along the arrangement direction of the battery cells; the plurality of second heat dissipation parts are arranged on both sides of the plurality of first heat dissipation parts along the arrangement direction of the plurality of battery cells, thereby forming two rows of heat dissipation structures arranged in parallel, and each row of second heat dissipation parts is arranged between the plurality of avoidance holes and the plurality of first heat dissipation parts on the corresponding side; the plurality of third heat dissipation parts are arranged on both side edges of the heat conducting plate along the arrangement direction of the plurality of battery cells.

[0008] In one embodiment, each of the above-mentioned first heat dissipation parts is provided with a first heat conducting hole and a plurality of heat dissipation fins. The first heat conducting hole is provided through the heat conducting plate. The plurality of heat dissipation fins are arranged in parallel along the extension direction of the first heat conducting hole and are provided across the top side of the first heat conducting hole.

[0009] In one embodiment, each of the above-mentioned second heat dissipation parts is provided with a second heat conduction hole and a first guide plate, the second heat conduction hole is set through the heat conduction plate; the first guide plate is set on the top side of the second heat conduction hole, and one end is connected to the surface of the heat conduction plate.

[0010] In one embodiment, the first guide plate is configured as a J-shaped plate, and the width direction of the first guide plate is arranged along the airflow direction.

[0011] In one embodiment, each of the third heat dissipation parts is provided with a third heat conduction hole and a second guide plate. The third heat conduction hole is provided through the heat conduction plate. The second guide plate is provided on the top side of the third heat conduction hole and one end is connected to the surface of the heat conduction plate.

[0012] In one embodiment, the second guide plate is configured as a J-shaped plate, and the width direction of the second guide plate is perpendicular to the airflow direction.

[0013] In one embodiment, the heat conducting plate is further provided with two first buckling portions, and the two first buckling portions are respectively provided at the edges of the top surface of the heat conducting plate.

[0014] In one embodiment, the cover plate is provided with two second buckling portions, which are respectively provided at the edge of the bottom surface of the cover plate corresponding to the two first buckling portions, and the two second buckling portions can be buckled with the corresponding first buckling portions.

[0015] In one embodiment, the heat conducting plate is further provided with a plurality of supporting portions, which are provided on the top surface of the heat conducting plate, and each supporting portion extends toward the cover plate by a preset height to provide stable support for the cover plate.

[0016] A battery pack is composed of several battery modules connected in series, and the battery pack also includes a shell and a thermal management system. The several battery modules and the thermal management system are all installed inside the shell, wherein the thermal management system includes a control unit, a fan and an air duct, the control unit is arranged at one end of the shell; the fan is arranged on the side wall of the shell, and the air inlet side of the fan is arranged toward the outside of the shell; one end of the air duct is connected to the air outlet side of the fan, and the other end of the air duct extends to one end of several heat dissipation units; the control unit is communicated with the fan to control the start and stop and speed of the fan.

[0017] In one embodiment, the above-mentioned air duct includes a main duct and several branch ducts, one end of the main duct is connected to the air outlet side of the fan, and the other end of the main duct extends a preset distance along the arrangement direction of the several battery modules; the several branch ducts correspond one-to-one to the several battery modules, wherein one end of each branch duct is connected to the main duct, and the other end of each branch duct is connected to the end of the corresponding heat dissipation unit.

[0018] In one embodiment, the housing is provided with a plurality of heat dissipation holes corresponding to the air inlet ends and the air outlet ends of the plurality of heat dissipation units.

[0019] In one embodiment, the control unit includes a plurality of temperature sensors, and each battery module is subjected to temperature detection via two temperature sensors.

[0020] In one embodiment, the battery pack further includes a PTC heating film, which is coated on the top and bottom surfaces of the battery modules.

[0021] In one of the embodiments, when the battery module temperature is lower than 15°C: the fan is stopped and the PTC heating film is started to preheat the battery; when the battery temperature is between 15°C and 35°C: the fan runs at low speed to maintain stable heat dissipation; when the battery temperature is higher than 35°C: the fan runs at high speed to maximize heat dissipation; when the battery temperature is higher than 50°C or the fan fails: the load is reduced or the battery is stopped, and a high temperature alarm is issued.

[0022] The battery module described above can dissipate heat from several battery cells through the heat dissipation unit. When the battery module is in operation, the heat generated by each battery cell can be transferred to the heat conduction plate through its electrical connection end for heat dissipation. The bottom surface of the cover plate corresponds to the top surface of the heat conduction plate, so that the cover plate can be snapped onto the top side of the heat conduction plate. A heat dissipation duct is formed between the cover plate and the heat conduction plate to guide the airflow through the heat dissipation unit. The airflow entering the heat dissipation unit from one end of the heat dissipation duct fully exchanges heat with the heat conduction plate, and is then blown out of the battery module from the other end of the heat dissipation duct, thereby achieving air cooling of the battery module. The heat conducting plate can fully cover a plurality of battery cells through a plurality of first heat dissipation parts, a plurality of second heat dissipation parts and a plurality of third heat dissipation parts and uniformly conduct heat to the battery cells, thereby greatly improving the temperature uniformity of each battery cell during actual operation, and is beneficial to maintaining the effectiveness, stability, accuracy and efficiency of the thermal management of the battery module. Compared with the existing liquid-cooled battery module and the battery pack composed of the same, the air-cooled battery module can greatly reduce the overall weight of the module and the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of a battery module in one embodiment;

[0024] Figure 2 This is a schematic diagram of the exploded structure of a battery module in one embodiment;

[0025] Figure 3 for Figure 2 An enlarged structural diagram of part M in the illustrated embodiment;

[0026] Figure 4 is a schematic structural diagram of a battery pack in one embodiment;

[0027] Figure 5 Schematic diagram of the explosion structure of a battery pack in one embodiment. DETAILED DESCRIPTION

[0028] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] In the description of the present invention, 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", "counterclockwise", "axial", "radial", "circumferential" and the like to 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 invention and simplifying the description, rather than indicating or implying 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 limiting the present invention.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0031] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0032] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0034] See also Figures 1 to 3The present invention discloses a battery module 10, which includes a plurality of battery cells 100 and a heat dissipation unit 200. The plurality of battery cells 100 are arranged in parallel and closely connected to form a structurally stable battery pack structure; the heat dissipation unit 200 is arranged at the electrical connection ends of the plurality of battery cells 100. The heat dissipation unit 200 can avoid the electrodes of the plurality of battery cells 100 and is attached to the corresponding end surface of each battery cell 100. Based on this, the heat dissipation unit 200 can conduct heat and dissipate heat for the plurality of battery cells 100. Specifically, the heat dissipation unit 200 includes a heat conducting plate 210 and a cover plate 220. The bottom surface of the heat conducting plate 210 is connected to the end surfaces of the electrical connection ends of several battery cells 100. Therefore, when the battery module 10 is in operation, the heat generated by each battery cell 100 can be transmitted to the heat conducting plate 210 through its electrical connection end for heat dissipation. The bottom surface of the cover plate 220 corresponds to the top surface of the heat conducting plate 210. Therefore, the cover plate 220 can be correspondingly buckled to the top side of the heat conducting plate 210. A heat dissipation duct a is formed between the cover plate 220 and the heat conducting plate 210 to guide the airflow flowing through the heat dissipation unit 200, so that the airflow entering the heat dissipation unit 200 from one end of the heat dissipation duct a can fully exchange heat with the heat conducting plate 210, and then be blown out from the other end of the heat dissipation duct a to the outside of the battery module 10, thereby realizing air cooling of the battery module 10. More specifically, the heat conducting plate 210 is provided with a plurality of avoidance holes b, a plurality of first heat dissipation portions 211, a plurality of second heat dissipation portions 212, and a plurality of third heat dissipation portions 213; the plurality of avoidance holes b are corresponding to the plurality of positive terminals and the plurality of negative terminals of the plurality of battery cells 100 and are provided through the heat conducting plate 210, thereby forming two rows of avoidance structures arranged in parallel along the arrangement direction of the battery cells 100, so as to facilitate the electrical connection of the plurality of battery cells 100; the plurality of first heat dissipation portions 211 correspond to the plurality of battery cells 100 one by one and are provided between the two rows of avoidance holes b. The first heat dissipation portions 211 are arranged along the arrangement direction of the battery cells 100, thereby forming a corresponding heat dissipation structure for each battery cell 100. A plurality of second heat dissipation portions 212 are arranged on both sides of the first heat dissipation portions 211 along the arrangement direction of the battery cells 100, thereby forming two parallel rows of heat dissipation structures. Each row of second heat dissipation portions 212 is arranged between the plurality of avoidance holes b and the plurality of first heat dissipation portions 211 on the corresponding side. A plurality of third heat dissipation portions 213 are arranged on both side edges of the heat conducting plate 210 along the arrangement direction of the battery cells 100. Based on the above arrangement, the heat conducting plate 210 can fully cover the plurality of battery cells 100 through the plurality of first heat dissipation portions 211, the plurality of second heat dissipation portions 212, and the plurality of third heat dissipation portions 213, and uniformly conduct heat to the battery cells 100, significantly improving the temperature uniformity of each battery cell 100 during actual operation, and facilitating the effective, stable, accurate, and efficient thermal management of the battery module 10.

[0035] Furthermore, each first heat dissipation portion 211 is provided with a first heat conducting hole c and a plurality of heat dissipation fins 2111. The first heat conducting hole c is provided through the heat conducting plate 210. The plurality of heat dissipation fins 2111 are arranged in parallel along the extension direction of the first heat conducting hole c and are provided astride the top side of the first heat conducting hole c. Thus, the heat generated by the battery cell 100 during operation can be transferred to the heat conducting plate 210. The heat absorbed by the heat conducting plate 210 can be efficiently heat-exchanged with the airflow in the heat dissipation duct a through the plurality of heat dissipation fins 2111, thereby promoting rapid heat dissipation of the heat conducting plate 210, thereby improving the heat dissipation efficiency of the heat conducting plate 210. The first heat conducting hole c can promote direct contact between the corresponding battery cell 100 and the airflow inside the heat dissipation duct a, which can further improve the gas flow on the surface of the battery cell 100 and enhance the heat dissipation efficiency.

[0036] Furthermore, each second heat dissipation portion 212 is provided with a second heat conduction hole d and a first deflector 2121. The second heat conduction hole d is provided through the heat conduction plate 210. The first deflector 2121 is provided on the top side of the second heat conduction hole d and connected to the surface of the heat conduction plate 210 at one end. Thus, the first deflector 2121 can restrict the flow of gas on the top side of the second heat conduction hole d, thereby promoting the airflow in the heat dissipation duct a to flow through the second heat conduction hole d to the battery cells 100 on the bottom side of the heat conduction plate 210, thereby improving the gas flow on the surface of the battery cells 100. Specifically, the first deflector 2121 is provided as a J-shaped plate, and the width of the first deflector 2121 is provided along the direction of airflow. The curved end of the first deflector 2121 is provided on the top side of the first heat conduction hole c, thereby realizing the first deflector 2121's function of guiding airflow.

[0037] Furthermore, each third heat dissipation portion 213 is provided with a third heat conducting hole e and a second deflector 2131. The third heat conducting hole e is provided through the heat conducting plate 210. The second deflector 2131 is provided on the top side of the third heat conducting hole e and connected to the surface of the heat conducting plate 210 at one end. Thus, the second deflector 2131 can restrict the flow of gas on the top side of the third heat conducting hole e, thereby promoting the airflow on the surface of the battery cell 100 to flow back through the third heat conducting hole e to the heat dissipation duct a on the top side of the heat conducting plate 210. This ensures that the airflow after heat absorption is discharged to the outside of the battery module 10 through the heat dissipation duct a. Specifically, the second deflector 2131 is provided as a J-shaped plate, and the width direction of the second deflector 2131 is provided perpendicular to the airflow direction, so that the hot airflow flowing out of the bottom side of the heat conducting plate 210 can be laterally merged into the heat dissipation airflow output to the outside of the battery module 10.

[0038] Furthermore, the heat conducting plate 210 is also provided with two first snap-fitting portions 214, and the two first snap-fitting portions 214 are respectively arranged at the edges of the top surface of the heat conducting plate 210. Correspondingly, the cover plate 220 is provided with two second snap-fitting portions 221, which are respectively corresponding to the two first snap-fitting portions 214 and are arranged at the edges of the bottom surface of the cover plate 220. The two second snap-fitting portions 221 can be snapped with the corresponding first snap-fitting portions 214, so that the cover plate 220 and the heat conducting plate 210 are stably connected.

[0039] Furthermore, the heat conducting plate 210 is also provided with a plurality of support portions 215, which are arranged on the top side surface of the heat conducting plate 210, and each support portion 215 extends toward the cover plate 220 by a preset height to stably support the cover plate 220, thereby maintaining the spatial stability of the heat dissipation duct a.

[0040] See also Figures 1 to 5 The present invention also discloses a battery pack 1, which is composed of the above-mentioned multiple battery modules 10 connected in series, and the battery pack 1 also includes a shell 20 and a thermal management system. The multiple battery modules 10 and the thermal management system are all installed inside the shell 20, wherein the thermal management system includes a control unit 30, a fan 40 and an air duct 50, the control unit 30 is arranged at one end of the shell 20; the fan 40 is arranged on the side wall of the shell 20, and the air inlet side of the fan 40 is arranged toward the outside of the shell 20; the air duct 50 One end of the air duct 50 is connected to the air outlet side of the fan 40, and the other end of the air duct 50 extends to one end of the plurality of heat dissipation units 200. Thus, the fan 40 can blow the external room temperature air through the air duct 50 into each heat dissipation unit 200 for heat exchange. After completing the heat exchange, the air flow is blown out from the other end of the heat dissipation unit 200 and then flows back to the outside of the battery pack 1 through the housing 20 to complete the heat dissipation process of the battery pack 1. The control unit 30 is in communication with the fan 40 to control the start and stop and the speed of the fan 40. Specifically, the air duct 50 includes a main duct 51 and several branch ducts 52, one end of the main duct 51 is connected to the air outlet side of the fan 40, and the other end of the main duct 51 extends a preset distance along the arrangement direction of the several battery modules 10; the several branch ducts 52 correspond to the several battery modules 10 one by one, wherein one end of each branch duct 52 is connected to the main duct 51, and the other end of each branch duct 52 is connected to the end of the corresponding heat dissipation unit 200, so that the fan 40 can independently transport cooling air to each heat dissipation unit 200 through the several branch ducts, thereby effectively improving the heat dissipation efficiency of the battery pack 1.

[0041] Furthermore, the shell 20 is provided with a plurality of heat dissipation holes at the air inlet and outlet ends corresponding to the plurality of heat dissipation units 200, so that the heat dissipation airflow of the battery pack 1 can form an exchange channel with the air environment outside the battery pack 1 through the plurality of heat dissipation holes, thereby promoting the heat dissipation work inside the battery pack 1.

[0042] In one embodiment, the control unit 30 includes a plurality of temperature sensors (not shown), and each battery module 10 is temperature-detected by two temperature sensors.

[0043] In one embodiment, the battery pack 1 further includes a PTC heating film 60 , which is coated on the top and bottom surfaces of the battery modules 10 .

[0044] In actual application, when the temperature of the battery module 10 is lower than 15°C: the fan is stopped and the PTC heating film 60 is started to preheat the battery; when the battery temperature is between 15°C and 35°C: the fan runs at low speed to maintain stable heat dissipation; when the battery temperature is higher than 35°C: the fan runs at high speed to maximize heat dissipation; when the battery temperature is higher than 50°C or the fan fails: the load is reduced or the battery is stopped, and a high temperature alarm is issued.

[0045] In summary, the battery module disclosed in the present invention can dissipate heat from a plurality of battery cells through a heat dissipation unit. When the battery module is in operation, the heat generated by each battery cell can be transferred to the heat conduction plate through its electrical connection end for heat dissipation. The bottom surface of the cover plate corresponds to the top surface of the heat conduction plate, so that the cover plate can be snapped onto the top side of the heat conduction plate. A heat dissipation duct is formed between the cover plate and the heat conduction plate to guide the airflow through the heat dissipation unit. The airflow entering the heat dissipation unit from one end of the heat dissipation duct undergoes sufficient heat exchange with the heat conduction plate, and is then blown out from the other end of the heat dissipation duct to the outside of the battery module, thereby achieving air cooling of the battery module. The heat conducting plate can fully cover a plurality of battery cells through a plurality of first heat dissipation parts, a plurality of second heat dissipation parts and a plurality of third heat dissipation parts and uniformly conduct heat to the battery cells, thereby greatly improving the temperature uniformity of each battery cell during actual operation, and is beneficial to maintaining the effectiveness, stability, accuracy and efficiency of the thermal management of the battery module. Compared with the existing liquid-cooled battery module and the battery pack composed of the same, the air-cooled battery module can greatly reduce the overall weight of the module and the battery pack.

[0046] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A battery module, characterized in that: include: A plurality of battery cells and heat dissipation units, wherein the battery cells are arranged parallel to each other and closely connected to form a stable battery pack structure; the heat dissipation units are arranged at the electrical connection ends of the battery cells, the heat dissipation units can avoid the electrodes of the battery cells, and are attached to the corresponding end surface of each battery cell; The heat dissipation unit includes a heat conducting plate and a cover plate. The bottom surface of the heat conducting plate is connected to the end surfaces of the electrical connection terminals of the plurality of battery cells. Thus, when the battery module is in operation, the heat generated by each battery cell can be transferred to the heat conducting plate through its electrical connection terminal for heat dissipation. The bottom surface of the cover plate corresponds to the top surface of the heat conducting plate. Thus, the cover plate can be correspondingly fastened to the top side of the heat conducting plate. A heat dissipation air duct is formed between the cover plate and the heat conducting plate to guide the airflow flowing through the heat dissipation unit. The heat conducting plate is provided with a plurality of avoidance holes, a plurality of first heat dissipation parts, a plurality of second heat dissipation parts and a plurality of third heat dissipation parts; the plurality of avoidance holes are corresponding to the plurality of positive terminals and the plurality of negative terminals of the plurality of battery cells and are provided through the heat conducting plate, thereby forming two rows of avoidance structures arranged in parallel along the arrangement direction of the battery cells; the plurality of first heat dissipation parts respectively correspond to the plurality of battery cells and are provided between the two rows of avoidance holes, and the plurality of first heat dissipation parts are provided along the arrangement direction of the battery cells; the plurality of second heat dissipation parts are provided on both sides of the plurality of first heat dissipation parts along the arrangement direction of the plurality of battery cells, thereby forming two rows of heat dissipation structures arranged in parallel, and each row of second heat dissipation parts is provided between the plurality of avoidance holes and the plurality of first heat dissipation parts on the corresponding side; the plurality of third heat dissipation parts are provided on both side edges of the heat conducting plate along the arrangement direction of the plurality of battery cells; Each first heat dissipation portion is provided with a first heat conduction hole and a plurality of heat dissipation fins, the first heat conduction hole is provided through the heat conduction plate; the plurality of heat dissipation fins are arranged in parallel along the extension direction of the first heat conduction hole and are provided across the top side of the first heat conduction hole; Each second heat dissipation portion is provided with a second heat conduction hole and a first guide plate, the second heat conduction hole is provided through the heat conduction plate; the first guide plate is provided on the top side of the second heat conduction hole, and one end is connected to the surface of the heat conduction plate; The first guide plate is configured as a J-shaped plate, and a width direction of the first guide plate is arranged along an airflow direction.

2. The battery module according to claim 1, wherein: Each third heat dissipation portion is provided with a third heat conduction hole and a second guide plate. The third heat conduction hole is provided through the heat conduction plate. The second guide plate is provided on the top side of the third heat conduction hole and one end is connected to the surface of the heat conduction plate.

3. The battery module according to claim 2, characterized in that: The second guide plate is configured as a J-shaped plate, and a width direction of the second guide plate is configured to be perpendicular to an airflow direction.

4. The battery module according to claim 3, characterized in that: The heat conducting plate is further provided with two first buckling portions, and the two first buckling portions are respectively provided at the edges of the top side surface of the heat conducting plate.

5. The battery module according to claim 4, characterized in that: The cover plate is provided with two second buckling portions which are respectively arranged at the edge of the bottom surface of the cover plate corresponding to the two first buckling portions. The two second buckling portions can be buckled with the corresponding first buckling portions.

6. The battery module according to claim 5, characterized in that: The heat conducting plate is further provided with a plurality of supporting portions, which are arranged on the top side surface of the heat conducting plate, and each supporting portion extends toward the cover plate by a preset height to stably support the cover plate.

7. A battery pack, comprising a plurality of battery modules according to any one of claims 1 to 6 connected in series, characterized in that: The battery pack also includes a shell and a thermal management system. Several battery modules and the thermal management system are installed inside the shell. The thermal management system includes a control unit, a fan and an air duct. The control unit is arranged at one end of the shell; the fan is arranged on the side wall of the shell, and the air inlet side of the fan is arranged toward the outside of the shell; one end of the air duct is connected to the air outlet side of the fan, and the other end of the air duct extends to one end of several heat dissipation units; the control unit is communicated with the fan to control the start and stop and speed of the fan.

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