Battery module and battery pack

Abstract

The invention discloses a battery module, the battery module comprises a plurality of battery monomers and a heat dissipation unit, the plurality of battery monomers are arranged in parallel and are tightly arranged and connected to form a battery pack structure with a stable structure; the heat dissipation unit is arranged at the electrical connection ends of the plurality of single batteries, can avoid the electrodes of the plurality of single batteries, and is attached to the corresponding end surface of each single battery; the heat dissipation unit comprises a heat conduction plate and a cover plate, and the bottom side surface of the heat conduction plate is connected to the end surfaces of the electrical connection ends of the plurality of battery monomers, so that when the battery module operates, heat generated by each battery monomer can be transmitted to the heat conduction plate through the electrical connection end of the battery monomer so as to perform heat dissipation work; and the bottom side surface of the cover plate is correspondingly matched with the top side surface of the heat conducting plate, so that the cover plate can be correspondingly buckled to the top side of the heat conducting plate. According to the battery module, heat conduction and heat dissipation can be carried out on the plurality of battery monomers 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 single cells (also called cells) connected in series and / or in parallel. It is an important energy storage unit in lithium batteries, electric vehicles, energy storage systems and other electronic devices. The battery module realizes the storage and release of energy by combining multiple cells into a whole. Specifically, the battery module can absorb electrical energy and store it in chemical form. The voltage can be increased by connecting cells in series, and the energy capacity of the battery module can be increased by connecting cells in parallel to provide the power required by the equipment. On this basis, the BMS can monitor the voltage, temperature and other states of each cell in real time to prevent overcharging, over-discharge or overheating. The battery module is usually composed of a single cell, a battery management system (BMS), a bracket and a fixed frame, a thermal management system, connectors and a protective shell. The thermal management system usually includes structural parts such as liquid cooling, air cooling or a heat spreader, and is placed under the control of the BMS to prevent overheating or overcooling of the battery during use. The battery pack is a complete energy storage and output device composed of multiple battery modules, which is used to provide power to the equipment 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] In order to ensure that the battery module has sufficient heat dissipation performance, existing battery modules and the battery packs composed of them usually manage the battery heat through liquid cooling. Based on this, the battery pack needs to be equipped with a liquid cooling plate and a coolant circulation device to realize the liquid cooling function of the battery module, or the battery module is wrapped by phase change material to realize the 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 battery pack structure with a stable 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 surfaces 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 passing 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 arranged through the heat conducting plate corresponding to a plurality of positive terminals and a plurality of negative terminals of a plurality of battery cells, thereby forming two rows of avoidance structures arranged in parallel along the arrangement direction of the battery cells; a plurality of first heat dissipation parts respectively correspond to a plurality of battery cells one by one and are arranged between the two rows of avoidance holes, and a plurality of first heat dissipation parts are arranged along the arrangement direction of the battery cells; a plurality of second heat dissipation parts are arranged on both sides of a 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 a plurality of avoidance holes and a plurality of first heat dissipation parts on the corresponding side; a 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 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 straddle the top side of the first heat conducting hole.

[0009] In one embodiment, each of the second heat dissipation parts is provided with a second heat conduction hole and a first guide plate, the second heat conduction hole is through-set in 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 of the embodiments, 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 through-set in the heat conduction plate; the second guide plate is set 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 of the embodiments, the second guide plate is configured as a J-shaped plate, and the width direction of the second guide plate is configured to be perpendicular to the airflow direction.

[0013] In one of the embodiments, 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.

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

[0015] In one of the embodiments, 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 stably support the cover plate.

[0016] A battery pack is composed of the above-mentioned battery modules connected in series, and the battery pack also includes a shell and a thermal management system, the 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 a plurality of heat dissipation units; the control unit is connected to the fan in communication to control the start and stop and the rotation speed of the fan.

[0017] In one embodiment, the above-mentioned air duct includes a main duct and a plurality of 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 plurality of battery modules; the plurality of branch ducts correspond one-to-one to the plurality of battery modules, respectively, 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 of the embodiments, the shell is provided with a plurality of heat dissipation holes at the air inlet and air outlet ends corresponding to 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 of the embodiments, the battery pack further comprises a PTC heating film, and the PTC heating film is coated on the top side surface and the bottom side surface of the plurality of battery modules.

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

[0022] The above-mentioned battery module can conduct heat and dissipate heat for several battery cells through the heat dissipation unit. When the battery module is in operation, the heat generated by each battery cell can be transmitted 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 correspondingly buckled to the top side of the heat conduction plate, and a heat dissipation duct is formed between the cover plate and the heat conduction plate to guide the airflow passing through the heat dissipation unit, so that the airflow entering the heat dissipation unit from one end of the heat dissipation duct can fully exchange heat with the heat conduction plate, and then blown out from the other end of the heat dissipation duct to the outside of the battery module, thereby realizing 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 evenly conduct heat to the battery cells, which greatly improves the temperature uniformity of each battery cell during actual operation, and is beneficial to maintaining the effectiveness, stability, accuracy and efficiency of 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 A schematic diagram of the structure of a battery module in one embodiment; Figure 2 A schematic diagram of an exploded structure of a battery module in one embodiment; Figure 3 for Figure 2 An enlarged structural schematic diagram of the M portion in the illustrated embodiment; Figure 4 is a schematic diagram of the structure of a battery pack in one embodiment; Figure 5 Schematic diagram of the explosion structure of a battery pack in one embodiment. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0025] 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 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, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0029] 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 a central 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 a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0030] 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 battery pack structure with a stable 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 running, 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 passing 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 is fully heat exchanged with the heat conducting plate 210, and then 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 parts 211, a plurality of second heat dissipation parts 212 and a plurality of third heat dissipation parts 213; the plurality of avoidance holes b are arranged through the heat conducting plate 210 corresponding to a plurality of positive terminals and a plurality of negative terminals of a plurality of battery cells 100, 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 parts 211 correspond to the plurality of battery cells 100 one by one and are arranged between the two rows of avoidance holes b. The first heat dissipation parts 211 are arranged along the arrangement direction of the battery cells 100, so as to form a corresponding heat dissipation structure for each battery cell 100; the second heat dissipation parts 212 are arranged on both sides of the first heat dissipation parts 211 along the arrangement direction of the battery cells 100, so as to form two parallel rows of heat dissipation structures, and each row of second heat dissipation parts 212 is arranged between the avoidance holes b and the first heat dissipation parts 211 on the corresponding side; the third heat dissipation parts 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 battery cells 100 through the first heat dissipation parts 211, the second heat dissipation parts 212 and the third heat dissipation parts 213 and evenly conduct heat to the battery cells 100, which greatly improves the temperature uniformity of each battery cell 100 during actual operation, and is conducive to maintaining the effectiveness, stability, accuracy and efficiency of the thermal management of the battery module 10.

[0031] Furthermore, each first heat dissipation portion 211 is provided with a first heat conducting hole c and a plurality of heat dissipation fins 2111, and 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 arranged across the top side of the first heat conducting hole c, so that the heat generated during the operation of the battery cell 100 can be conducted to the heat conducting plate 210, and 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, so as to promote rapid heat dissipation of the heat conducting plate 210, thereby improving the heat dissipation efficiency of the heat conducting plate 210, and the first heat conducting hole c can cause the corresponding battery cell 100 to directly contact with the airflow inside the heat dissipation duct a, which can further improve the gas fluidity on the surface of the battery cell 100 and enhance the heat dissipation efficiency.

[0032] Further, each second heat dissipation portion 212 is provided with a second heat conduction hole d and a first guide plate 2121, wherein the second heat conduction hole d is provided through the heat conduction plate 210; the first guide plate 2121 is provided on the top side of the second heat conduction hole d, and one end of the first guide plate 2121 is connected to the surface of the heat conduction plate 210, so that the first guide plate 2121 can limit the gas flow direction on the top side of the second heat conduction hole d, so as to promote the airflow in the heat dissipation duct a to flow to the battery cell 100 on the bottom side of the heat conduction plate 210 through the second heat conduction hole d, thereby improving the gas flow on the surface of the battery cell 100. Specifically, the first guide plate 2121 is provided as a J-shaped plate, and the width direction of the first guide plate 2121 is provided along the airflow direction, and the curved end of the first guide plate 2121 is provided on the top side of the first heat conduction hole c, so as to realize the airflow guiding function of the first guide plate 2121 on the airflow.

[0033] Further, each third heat dissipation portion 213 is provided with a third heat conducting hole e and a second guide plate 2131, wherein the third heat conducting hole e is provided through the heat conducting plate 210; the second guide plate 2131 is provided on the top side of the third heat conducting hole e, and one end of the second guide plate 2131 is connected to the surface of the heat conducting plate 210, so that the second guide plate 2131 can limit the gas flow direction on the top side of the third heat conducting hole e, so as to promote the airflow on the surface of the battery cell 100 to flow back to the heat dissipation duct a on the top side of the heat conducting plate 210 through the third heat conducting hole e, so as to ensure that the airflow after completing heat absorption is discharged to the outside of the battery module 10 through the heat dissipation duct a. Specifically, the second guide plate 2131 is provided as a J-shaped plate, and the width direction of the second guide plate 2131 is provided perpendicular to the airflow direction, so as to realize that the hot airflow flowing out from 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.

[0034] 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 edge 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 arranged at the edge of the bottom surface of the cover plate 220 corresponding to the two first snap-fitting portions 214. The two second snap-fitting portions 221 can be snapped with the corresponding first snap-fitting portions 214, so as to ensure a stable connection between the cover plate 220 and the heat conducting plate 210.

[0035] Furthermore, the heat conducting plate 210 is also provided with a plurality of supporting portions 215, which are arranged on the top side surface of the heat conducting plate 210, and each supporting 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.

[0036] See also Figures 1 to 5 The present invention also discloses a battery pack 1, which is composed of the above-mentioned plurality of battery modules 10 connected in series, and the battery pack 1 also includes a shell 20 and a thermal management system, the plurality of battery modules 10 and the thermal management system are 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 0 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, so that the fan 40 can blow the external room temperature air into each heat dissipation unit 200 through the air duct 50 for heat exchange, and the airflow after the heat exchange 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 shell 20 to complete the heat dissipation process of the battery pack 1; the control unit 30 is connected to the fan 40 in communication to control the start and stop and the speed of the fan 40. Specifically, the air duct 50 includes a main duct 51 and a plurality of branch ducts 52, wherein 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 plurality of battery modules 10; the plurality of branch ducts 52 correspond to the plurality of battery modules 10 one by one, respectively, 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 deliver cooling airflow to each heat dissipation unit 200 through the plurality of branch ducts, thereby effectively improving the heat dissipation efficiency of the battery pack 1.

[0037] 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.

[0038] In one embodiment, the control unit 30 includes a plurality of temperature sensors (not shown), and each battery module 10 is subjected to temperature detection via two temperature sensors.

[0039] In one embodiment, the battery pack 1 further includes a PTC heating film 60 , and the PTC heating film 60 is coated on the top side surface and the bottom side surface of the plurality of battery modules 10 .

[0040] In actual application, when the temperature of the battery module 10 is lower than 15°C: stop the fan and start the PTC heating film 60 to preheat the battery; when the battery temperature is between 15°C and 35°C: run the fan at a low speed to maintain stable heat dissipation; when the battery temperature is higher than 35°C: run the fan at a high speed to maximize heat dissipation; when the battery temperature is higher than 50°C or the fan fails: reduce the load or stop the battery and issue a high temperature alarm.

[0041] In summary, the battery module disclosed in the present invention can conduct heat and dissipate heat for a number of battery cells through a heat dissipation unit. When the battery module is in operation, 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, so that 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 passing through the heat dissipation unit, so that the airflow entering the heat dissipation unit from one end of the heat dissipation duct can fully exchange heat with the heat conducting plate, and then blown out from the other end of the heat dissipation duct to the outside of the battery module, thereby realizing 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 evenly conduct heat to the battery cells, which greatly improves the temperature uniformity of each battery cell during actual operation, and is beneficial to maintaining the effectiveness, stability, accuracy and efficiency of 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.

[0042] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0043] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A battery module, characterized in that: include: A plurality of battery cells and a heat dissipation unit, wherein the battery cells are arranged in parallel and closely connected to each other, thereby forming a battery pack structure with a stable structure; the heat dissipation unit is arranged at the electrical connection end of the battery cells, the heat dissipation unit can avoid the electrodes of the battery cells, and is 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 ends of the battery cells, so that 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 to dissipate heat; 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, and 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 arranged through the heat conducting plate corresponding to a plurality of positive terminals and a plurality of negative terminals of a plurality of battery cells, thereby forming two rows of avoidance structures arranged in parallel along the arrangement direction of the battery cells; a plurality of first heat dissipation parts respectively correspond to a plurality of battery cells one by one and are arranged between the two rows of avoidance holes, and a plurality of first heat dissipation parts are arranged along the arrangement direction of the battery cells; a plurality of second heat dissipation parts are arranged on both sides of a 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 a plurality of avoidance holes and a plurality of first heat dissipation parts on the corresponding side; a 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.

2. The battery module according to claim 1, characterized in that: Each first heat dissipation part 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 straddle the top side of the first heat conduction hole.

3. The battery module according to claim 2, characterized in that: Each second heat dissipation part is provided with a second heat conduction hole and a first guide plate. The second heat conduction hole is through-set in the heat conduction plate; the first guide plate is set on the top side of the second heat conduction hole, and one end of the first guide plate is connected to the surface of the heat conduction plate.

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

5. The battery module according to claim 4, characterized in that: Each third heat dissipation part is provided with a third heat conduction hole and a second guide plate. The third heat conduction hole is through-set in the heat conduction plate; the second guide plate is set on the top side of the third heat conduction hole, and one end is connected to the surface of the heat conduction plate.

6. The battery module according to claim 5, 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.

7. The battery module according to claim 6, characterized in that: The heat conducting plate is further provided with two first buckling parts, and the two first buckling parts are respectively arranged at the edges of the top side surface of the heat conducting plate.

8. The battery module according to claim 7, characterized in that: The cover plate is provided with two second buckling parts respectively corresponding to the two first buckling parts and arranged at the edge of the bottom surface of the cover plate, and the two second buckling parts can be buckled with the corresponding first buckling parts.

9. The battery module according to claim 8, characterized in that: The heat conducting plate is further provided with a plurality of supporting parts, which are arranged on the top side surface of the heat conducting plate, and each supporting part extends toward the cover plate by a preset height to stably support the cover plate.

10. A battery pack, the battery pack being composed of a plurality of battery modules according to any one of claims 1 to 9 connected in series, characterized in that: The battery pack also includes a shell and a thermal management system, and several battery modules and the thermal management system are 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 the speed of the fan.

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