Battery pack

Abstract

The utility model discloses an embodiment proposes a kind of battery pack. The outer surface of the upper shell of the battery pack is equipped with exhaust port;In the height direction of battery pack, the BMS plate is installed in the upper shell;The first end of the communication pin is electrically connected the BMS plate, the tail end of the communication pin extends and exceeds the BMS plate towards the direction parallel to the plate body plane where the BMS plate is located;Each of the first conductive row and the second conductive row is connected on the BMS plate, each of the first conductive row and the second conductive row extends out the BMS plate along the direction parallel to the plate body plane of the BMS plate and towards the exhaust port, at least part of the exhaust port is located between the first conductive row and the second conductive row;The switch unit is located between the first conductive row and the second conductive row. Therefore, the battery pack of the embodiment of the utility model helps to improve the flowability of gas in the shell and the advantage of improving the safety of battery pack.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery pack. Background Technology

[0002] The battery pack includes a casing and battery modules, with the battery modules housed within the casing. To monitor and control the charging and discharging of the battery modules, a BMS (Battery Management System) board is also installed inside the casing. In related technologies, the conductive busbars extend perpendicular to the thickness of the BMS board, which not only occupies the ventilation space within the casing and hinders the dissipation of high-temperature gases, but also makes it difficult for heat to dissipate from the inside of the casing, thus affecting the battery pack's operating efficiency and safety. Utility Model Content

[0003] In view of this, the present invention aims to provide a battery pack to solve the problem in the prior art where the large space occupied by the conductive busbars inside the casing leads to the obstruction of high-temperature gas inside the casing, affecting the safety of the battery pack.

[0004] This utility model provides a battery pack.

[0005] The battery pack includes an upper housing, a lower housing, a battery module, a first conductive busbar, a second conductive busbar, a switching unit, and communication pins.

[0006] The upper housing has an exhaust port on its outer surface, and the lower housing is sealed to the upper housing and forms a receiving cavity inside it, the receiving cavity being connected to the exhaust port; the battery module is disposed in the receiving cavity;

[0007] In the height direction of the battery pack, the BMS board is disposed on the battery module and mounted on the upper housing; the first end of the communication pin is electrically connected to the BMS board, and the tail end of the communication pin extends in a direction parallel to the plane of the BMS board and beyond the BMS board; each of the first conductive bar and the second conductive bar is connected to the BMS board, and each of the first conductive bar and the second conductive bar extends out of the BMS board in a direction parallel to the plane of the BMS board and toward the exhaust port, and at least a portion of the exhaust port is located between the first conductive bar and the second conductive bar in the orthographic projection of the plane where the exhaust port is located; the switching unit is disposed on the BMS board and is located between the first conductive bar and the second conductive bar. Specifically, the first conductive bar and the second conductive bar are spaced apart in the width direction of the battery pack, and the switching unit is located between the first conductive bar and the second conductive bar.

[0008] The battery pack of this embodiment extends the first conductive busbar, the second conductive busbar, and the communication pin along a direction parallel to the plane of the BMS board. This reduces the space occupied by the first conductive busbar, the second conductive busbar, and the communication pin in the height direction. With a fixed housing height, this means more space is provided for gas flow, reducing potential physical obstructions during gas exhaust and making exhaust smoother. This allows for a rapid and effective exhaust mechanism to prevent thermal runaway in the event of battery failure or overheating, thereby improving the safety of the battery pack.

[0009] Meanwhile, connecting each of the first and second conductive bars to the side of the BMS board opposite to the exhaust port helps to reduce the length of the gas guide path, thereby further reducing the obstruction of gas in the casing and further improving the safety of the battery pack.

[0010] Furthermore, since the switching unit is a heat-generating element, placing it between the first and second conductive bars helps to dissipate the heat generated by the switching unit through the vent in a timely manner along the space between the first and second conductive bars. This further enhances the safety of the battery pack.

[0011] Therefore, the battery pack of this utility model embodiment helps to reduce gas stagnation in the casing and improve battery pack safety.

[0012] In one embodiment, the switching unit is disposed on the BMS board in a region near the exhaust port, and the switching unit and the exhaust port are disposed opposite to each other in the length direction of the battery pack.

[0013] In one embodiment, the first conductive bus and the second conductive bus are welded to the BMS board at a distance from each other in the width direction of the battery pack, and the distance between the portion of each of the first conductive bus and the second conductive bus extending out of the BMS board in the width direction of the battery pack gradually increases or remains constant along the direction from the BMS board to the exhaust port.

[0014] In one embodiment, each of the first and second conductive busbars includes a connected base portion and an extension portion, the base portion being at least partially connected to the BMS board, the base portion extending along the length direction of the battery pack, the extension portion extending along the width direction of the battery pack, and the base portion and the extension portion having a chamfered portion at the connection.

[0015] In one embodiment, the BMS board has multiple heat dissipation holes in the area near the first and second conductive busbars.

[0016] Furthermore, the first conductive busbar covers at least a portion of the plurality of heat dissipation holes.

[0017] Furthermore, the second conductive busbar covers at least a portion of the plurality of heat dissipation holes.

[0018] In one embodiment, the battery pack of this utility model further includes an input port disposed on the inner surface of the upper housing, and an output port disposed on the outer surface of the upper housing. The communication pin extends from the input port to the output port. The cross-section formed along the length direction perpendicular to the battery pack is smaller than the cross-section of the input port.

[0019] In one embodiment, the voltage of the communication pin is less than 10V.

[0020] In one embodiment, at least one of the first conductive bus and the second conductive bus is provided with a protrusion, and the BMS board is provided with an embedded hole, in which the protrusion is embedded.

[0021] In one embodiment, the battery pack of this utility model further includes a plurality of TVS tubes, which are disposed on the side of the BMS board facing the battery module.

[0022] In one embodiment, the battery pack of this utility model has multiple protrusions and multiple recesses. The multiple protrusions are spaced apart along the length direction of the battery pack. The multiple protrusions are correspondingly disposed in the multiple recesses. One of the multiple recesses is a circular recess, and the other recess is an oval recess.

[0023] In one embodiment, the projection of the battery pack in the height direction of the battery pack, and the projection of the plurality of TVS tubes fall into the projection of the first conductive busbar and / or the projection of the second conductive busbar.

[0024] In one embodiment, the distance between the TVS tube and the recessed hole in the battery pack of this utility model is less than 10mm.

[0025] In one embodiment, the BMS board of the battery pack of this utility model is connected to the upper housing by self-tapping screws.

[0026] In one embodiment, the battery module of the battery pack of this utility model includes a plurality of cells arranged in parallel, and the cells are pouch cells.

[0027] In one embodiment, the battery pack of this utility model further includes an insulating film disposed between the battery module and the BMS board.

[0028] In one embodiment, the battery cell of the battery pack of the present utility model includes a film shell, an electrode assembly, and a tab. The tab is led out of the cell shell from one side of the electrode assembly in the height direction, and the film shell and the tab are coated and connected through the tab adhesive layer.

[0029] The tab adhesive layer includes a first layer, a second layer, and a third layer that are stacked in sequence. Among them, the melting point S1 of the first layer, the melting point S2 of the second layer, and the melting point S3 of the third layer satisfy: S1 < S2, S3 < S2. The melting point S1 of the first layer and the melting point S3 of the third layer satisfy: 80°C < S1 ≤ 135°C, S1 = S3. The melting point S4 of the PP layer of the film shell is 155 - 175°C. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a perspective view of the battery pack of the embodiment of the present utility model.

[0031] Figure 2 is an exploded view of the battery pack of the embodiment of the present utility model.

[0032] Figure 3 is an exploded view of the battery pack of the embodiment of the present utility model, omitting the upper housing.

[0033] Figure 4 is another exploded view of the battery pack of the embodiment of the present utility model, omitting the upper housing.

[0034] Figure 5 is a top view of the battery pack of the embodiment of the present utility model, omitting the upper housing.

[0035] Figure 6 is a perspective view of the cooperation of the BMS board, the first conductive bar, and the second conductive bar, etc. of the embodiment of the present utility model Figure 1 where the upper surface is the side facing the battery module.

[0036] Figure 7 is a perspective view of the cooperation of the BMS board, the first conductive bar, and the second conductive bar, etc. of the embodiment of the present utility model Figure 2 where the upper surface is the side away from the battery module.

[0037] Figure 8 is a perspective view of the cooperation of the BMS board, the first conductive bar, and the second conductive bar, etc. of the embodiment of the present utility model Figure 3 where the upper surface is the side away from the battery module.

[0038] Figure 9 is a top view of the cooperation of the BMS board, the first conductive bar, and the second conductive bar, etc. of an embodiment of the present utility model.

[0039] Figure 10 This is a top view of the BMS board, the first conductive busbar, and the second conductive busbar in another embodiment of this utility model.

[0040] Figure 11 This is an exploded view of the BMS board, the first conductive busbar, and the second conductive busbar according to another embodiment of the present invention.

[0041] Figure 12 This is a cross-sectional view of the tab adhesive layer and the tab mating in an embodiment of this utility model.

[0042] Explanation of reference numerals in the attached figures:

[0043] Upper casing 1; Exhaust port 101;

[0044] Lower housing 2;

[0045] Battery module 3;

[0046] BMS board 4; heat dissipation hole 41; circular recessed hole 42; oval hole 43;

[0047] Communication pin 5;

[0048] First conductive busbar 6; base portion 61; extension portion 62; chamfered portion 63; protrusion portion 64;

[0049] Second conductive busbar 7;

[0050] Switching unit 8;

[0051] TVS tube 9;

[0052] Insulating and thermally conductive adhesive 10;

[0053] Insulating film 11; Input port 12; Output port 13;

[0054] Tab adhesive layer 14; first layer 141; second layer 142; third layer 143;

[0055] Extreme ear 15. Detailed Implementation

[0056] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0057] The following is for reference. Figures 1-12 The following is a description of a battery pack according to an embodiment of the present invention. The switching unit 8 is shown only in some of the figures.

[0058] The battery pack of this utility model embodiment may include an upper shell 1, a lower shell 2, a battery module 3, a first conductive bar 6, a second conductive bar 7, a switch unit 8, and a communication pin 5.

[0059] The upper housing 1 has an exhaust port 101 on its outer surface. The lower housing 2 is sealed to the upper housing 1 and forms a receiving cavity inside it. The receiving cavity is connected to the exhaust port 101. The battery module 3 is disposed in the receiving cavity. In the height direction of the battery pack, the BMS board 4 is disposed on the battery module 3 and is mounted on the upper housing 1. The first end of the communication pin 5 is electrically connected to the BMS board 4, and the tail end of the communication pin 5 extends in a direction parallel to the plane of the BMS board 4 and extends beyond the BMS board 4. Each of the first conductive busbar 6 and the second conductive busbar 7 is connected to the BMS board 4, and each of the first conductive busbar 6 and the second conductive busbar 7 extends out of the BMS board 4 in a direction parallel to the plane of the BMS board 4 and toward the exhaust port 101. In the orthographic projection of the plane where the exhaust port 101 is located, at least a portion of the projection of the exhaust port 101 is located between the first conductive busbar 6 and the second conductive busbar 7. The switch unit 8 is disposed on the BMS board 4 and is located between the first conductive busbar 6 and the second conductive busbar 7. Specifically, the first conductive bar 6 and the second conductive bar 7 are arranged at intervals along the width direction of the battery pack, and the switch unit 8 is located between the first conductive bar 6 and the second conductive bar 7.

[0060] The battery pack of this embodiment extends the first conductive busbar 6, the second conductive busbar 7, and the communication pin 5 along a direction parallel to the plane of the BMS board 4. This reduces the space occupied by the first conductive busbar 6, the second conductive busbar 7, and the communication pin 5 in the height direction. With a fixed housing height, this means more space is provided for gas flow, reducing physical obstructions that gas may encounter during exhaust, making exhaust smoother. This allows for a rapid and effective exhaust mechanism to prevent thermal runaway in the event of battery failure or overheating, thereby improving the safety of the battery pack.

[0061] Meanwhile, connecting each of the first conductive busbar 6 and the second conductive busbar 7 to the side of the BMS board 4 opposite to the exhaust port 101 helps to reduce the length of the gas guide path, thereby further reducing the obstruction of gas in the casing and further improving the safety of the battery pack.

[0062] Furthermore, since the switching unit 8 is a heat-generating element, placing it between the first conductive bar 6 and the second conductive bar 7 helps to dissipate the heat generated by the switching unit 8 through the exhaust port 101 in a timely manner along the space between the first conductive bar 6 and the second conductive bar 7. This further enhances the safety of the battery pack.

[0063] Therefore, the battery pack of this utility model embodiment helps to reduce gas stagnation in the casing and improve battery pack safety.

[0064] It should be noted that the length, width, and height are described based on the battery pack, and the length, width, and height directions are set perpendicular to each other. The length direction is perpendicular to... Figure 1 The X-direction shown is the width direction and Figure 1 The Y-axis shown is the height direction. Figure 1 The Z direction shown is... Figure 3 The up and down directions are shown in the diagram.

[0065] Optionally, the switching unit 8 can be at least one MOSFET or at least one relay, the first conductive bus 6 can be the positive output bus of the battery cell, and the second conductive bus 7 can be the total positive output bus.

[0066] Optionally, insulating and thermally conductive adhesive 10 is provided on both the outer and bottom walls of the battery module 3. This is to achieve fixation and heat dissipation between the lower housing 2 and the battery module 3, thereby further improving the safety of the battery pack.

[0067] Furthermore, such as Figure 3 and Figure 7 As shown, along the height direction of the battery pack, the BMS board 4 has a first surface that is positioned opposite to the front surface (e.g., ...). Figure 3 The lower surface shown) and the second surface (e.g., Figure 3 As shown in the diagram, the first surface faces the battery module 3, and the communication pin 5, switch unit 8, first conductive bus 6, and second conductive bus 7 are all disposed on the second surface. It can be understood that the communication pin 5, switch unit 8, first conductive bus 6, and second conductive bus 7 are all located on the side of the BMS board 4 facing away from the battery module 3.

[0068] The battery pack of this embodiment, by allocating the communication pin 5, switch unit 8, first conductive bar 6, and second conductive bar 7 to the second surface, i.e., the side facing away from the battery module 3, reduces the chance of the electrical connections in this part being directly exposed to the risk of thermal runaway or other malfunctions that may be caused by the battery module 3. This helps prevent electrical accidents such as short circuits and arcing, and improves the overall safety of the system. Simultaneously, it can also isolate the electromagnetic interference between them and the battery module 3 to a certain extent, helping to reduce the impact of electromagnetic interference on communication signals and improve the stability and reliability of the system.

[0069] like Figure 7 , Figure 9 and Figure 10As shown, the switch unit 8 and the exhaust port 101 are arranged opposite each other in the length direction, and the switch unit 8 is located on the BMS board 4 near the exhaust port 101, that is, on the side of the BMS board 4 near the exhaust port 101. It can be understood that since the switch unit 8 is located between the first conductive bar 6 and the second conductive bar 7, the switch unit 8 is also located near the exhaust port 101.

[0070] The battery pack of this utility model embodiment, by having the switching unit 8 and the exhaust port 101 arranged opposite each other in the length direction, helps to further reduce the length of the gas guiding path, thereby further reducing the obstruction of gas in the housing, and further improving the safety of the battery pack.

[0071] Optionally, the projection of the switching unit 8 onto the plane containing the exhaust port 101 at least partially overlaps with the projection of the exhaust port 101. This allows the heat generated by the switching unit 8 to be discharged more smoothly through the exhaust port 101, further reducing the obstruction of gas within the casing and thus further improving the safety of the battery pack.

[0072] like Figure 5 , Figure 9 and Figure 10 As shown, the first conductive bus 6 and the second conductive bus 7 are welded to the BMS board 4 at a distance in the width direction, and the distance between the portions of the first conductive bus 6 and the second conductive bus 7 extending out of the BMS board 4 in the width direction increases along the direction from the BMS board 4 to the exhaust port 101.

[0073] The battery pack of this embodiment increases the spacing in the width direction of the portions of the first conductive bar 6 and the second conductive bar 7 extending out of the BMS plate 4. This means an increased exhaust cross-section, allowing for smoother gas flow guidance. The lower outlet velocity reduces impact on the surrounding environment, minimizing turbulence and noise, resulting in more uniform and gentle exhaust. This further reduces the impact of exhaust on components surrounding the exhaust port 101. Simultaneously, the slower airflow velocity and larger air-guiding area provide more time and contact area for heat absorption, contributing to improved heat dissipation.

[0074] Optionally, the spacing between the portions of the first conductive bar 6 and the second conductive bar 7 extending out of the BMS plate 4 gradually increases in the width direction. This gradually increasing width allows for more uniform and gentler discharge, further reducing the impact of exhaust on components surrounding the exhaust port 101, thereby improving the safety of the battery pack.

[0075] This invention is not limited to this embodiment. In other embodiments, the distance between the portions of the first conductive busbar 6 and the second conductive busbar 7 extending out of the BMS board 4 in the width direction remains unchanged. This design occupies relatively little space in the width direction of the accommodating cavity, which facilitates the placement of other electrical components.

[0076] like Figures 9 to 11 As shown, each of the first conductive busbar 6 and the second conductive busbar 7 includes a connected base portion 61 and an extension portion 62. At least a portion of the base portion 61 is connected to the BMS board 4. The base portion 61 extends in the length direction, the extension portion 62 extends in the width direction, and the base portion 61 and the extension portion 62 are provided with a chamfered portion 63 at the connection.

[0077] In this embodiment of the battery pack, a chamfered portion 63 is provided at the connection point between the base portion 61 and the extension portion 62 of each of the first conductive bar 6 and the second conductive bar 7. This allows airflow to be guided more smoothly to the exhaust port 101, avoiding the problem of dead airflow. As a result, the smoothness of exhaust is further improved.

[0078] Optionally, the base portion 61 and the extension portion 62 transition at the connection with a rounded corner or a chamfered corner.

[0079] like Figure 8 and Figure 11 As shown, multiple heat dissipation holes 41 are provided on the BMS board 4 near the first conductive busbar 6 and the second conductive busbar 7. Because the first conductive busbar 6 and the second conductive busbar 7 house the heat-generating switching unit 8, and because the first conductive busbar 6 and the second conductive busbar 7 are the positive terminals of the battery module and the battery pack, respectively, their heat generation is significant. The heat dissipation holes 41 help dissipate this heat more quickly, preventing localized overheating and thus protecting the switching unit 8 and other sensitive electronic components from high-temperature damage. This is beneficial for extending the service life of the switching unit 8.

[0080] In some embodiments, the first conductive bus covers at least a portion of the plurality of heat dissipation holes. This improves the heat dissipation efficiency of the first conductive bus.

[0081] In some embodiments, the second conductive bus covers at least a portion of the plurality of heat dissipation holes. Similarly, this can improve the heat dissipation efficiency of the first conductive bus.

[0082] like Figure 10 As shown, the battery pack of this embodiment further includes an input port 12 disposed on the inner surface of the upper housing 1, and an output port 13 disposed on the outer surface of the upper housing 1 (the output port 13 is only for illustrative purposes regarding its position and volume). The communication pin 5 extends from the input port 12 into the output port 13. The cross-section formed along the length direction perpendicular to the battery pack is smaller than the cross-section of the input port 12 than that of the output port 13. It can be understood that the input port 12 is disposed within the accommodating cavity, while the output port 13 is formed on the outer surface of the upper housing 1.

[0083] The battery pack of this utility model achieves the transformation of the small end inside the cavity to the large end outside the cavity by making the cross-section of the input port 12 disposed in the accommodating cavity smaller than that of the output port 13 located on the outer surface of the upper housing 1. With the lengths of the output port 13 and the input port 12 being constant, the design of reducing the cross-sectional area reduces the space occupied by the input port 12 in the accommodating cavity. This not only facilitates the layout of the input port 12, but also helps to reduce the obstruction of gas in the accommodating cavity.

[0084] The voltage of communication pin 5 is below 10V. Preferably, the voltage of communication pin 5 is below 5V.

[0085] The battery pack of this embodiment features a communication pin 5 with a voltage below 10V. Lower voltage means a lower risk of electric shock, thus improving operator safety. Simultaneously, reducing voltage decreases power loss in the communication lines, which helps extend the overall system's uptime. Furthermore, using a lower voltage avoids the risk of damage to other sensitive electronic components on the BMS board 4, especially integrated circuits and sensors designed for low-voltage operation. Therefore, a communication pin 5 voltage below 10V not only enhances the safety of operators and related sensitive components but also reduces power loss.

[0086] like Figure 11 As shown, at least one of the first conductive busbar 6 and the second conductive busbar 7 has a protrusion 64 on its base portion 61, and the BMS plate 4 has an insert hole in which the protrusion 64 is inserted. Preferably, each of the first conductive busbar 6 and the second conductive busbar 7 has a protrusion 64 on its base portion 61.

[0087] In this embodiment of the battery pack, the protrusions 64 on the conductive bars (first conductive bar 6 and second conductive bar 7) are embedded in the recesses on the BMS board 4, which helps to position and fix the conductive bars to the BMS board 4. Moreover, when welding the conductive bars, welding is performed through the recesses and the protrusions 64, which increases the welding area between the conductive bars and the BMS board 4, thus further improving the reliability of the conductive bar welding.

[0088] Optionally, the base portion 61 of at least one of the first conductive busbar 6 and the second conductive busbar 7 is fixed to the BMS board 4 by reflow soldering.

[0089] like Figure 6 and Figure 11 As shown, there are multiple protrusions 64 and multiple recesses. The multiple protrusions 64 are spaced apart along the length direction of the battery pack (i.e., the extension direction of the base portion 61). The multiple protrusions 64 are correspondingly disposed in the multiple recesses. One of the multiple recesses is a circular recess 42, and the other recess is an oblong recess 43. Specifically, the length direction of the oblong recess 43 is consistent with the length direction of the battery pack.

[0090] In this embodiment of the battery pack, one of the recesses in the BMS board 4 is set as a circular recess 42. This circular hole can precisely limit the protrusion 64, preventing relative movement between the conductive busbar and the BMS board 4 when the battery pack vibrates during operation. Simultaneously, the oblong hole 43 helps compensate for dimensional errors during manufacturing and installation, improving adaptability during assembly. Especially when precise alignment of multiple holes is required, one point is first fixed using the circular recess 42, and then the oblong hole is used to adjust the position of the remaining parts, simplifying the assembly process and making assembly easier.

[0091] like Figure 6 and Figure 11 As shown, the battery pack of this embodiment also includes TVS tubes 9 (transient voltage suppressor tubes), and multiple TVS tubes 9 are disposed on the side of the BMS board 4 facing the battery module 3; in the height direction, the projections of the multiple TVS tubes 9 fall into the projections of the first conductive bus 6 and / or the second conductive bus 7. For example, Figure 6 As shown, the projection of a portion of the TVS tube 9 falls within the projection of the first conductive busbar 6, while the projection of another portion of the TVS tube 9 falls within the projection of the second conductive busbar 7.

[0092] In this embodiment of the battery pack, the projection of the TVS diode 9 falls within the projection of the conductor bus, meaning that the TVS diode 9 and the conductor bus are directly opposite each other. This shortens the electrical path length from the interference source to the TVS diode 9. This design allows the TVS diode 9 to more directly and quickly respond to and absorb overvoltages or transient voltages introduced through the conductors. This enables the TVS diode 9 to clamp voltage faster and more effectively, reducing the damage of voltage spikes to the BMS and other connected devices, thus improving the protection efficiency of the circuit and providing better protection.

[0093] Furthermore, since the lead busbar is part of the heat dissipation path, placing it directly opposite the TVS tube 9 may help dissipate heat more effectively. This helps maintain the operating temperature of the TVS tube 9 within a safe range, thereby extending its service life.

[0094] The BMS board 4 has embedded holes, and the distance between each TVS diode 9 and the embedded hole is less than 10mm. Similarly, a larger distance means that the electrical path from the interference source to the TVS diode 9 becomes longer, which increases the signal transmission time delay and causes the TVS diode 9 to respond to transient voltages to a decrease, thereby affecting its protection effect.

[0095] Optionally, the distance between each TVS tube 9 and the recess is 1mm, 2mm, 3mm, 4mm, 6mm, 8mm, or 9mm.

[0096] The BMS board 4 is connected to the upper housing 1 by self-tapping screws. Fixing the BMS board 4 firmly on the upper housing 1 enhances the stability and durability of the overall structure and reduces damage caused by vibration or other mechanical stresses. Self-tapping screws have a certain tolerance capacity for slight position errors, and even if the hole positions are slightly offset, they can effectively fix the components, improving the flexibility of assembly.

[0097] As Figure 3 shown, the battery pack of the embodiment of the present utility model further includes an insulating film 11, and the insulating film 11 is disposed between the battery module 3 and the BMS board 4.

[0098] For the battery pack of the embodiment of the present utility model, the insulating film 11 disposed between the battery module 3 and the BMS board 4 can provide electrical isolation for both, preventing accidental short circuits between the battery module 3 and the BMS board 4. Effectively blocking the abnormal flow of current, the insulating film 11 reduces the risk of electric shock, thereby improving the safety of the entire battery system.

[0099] Optionally, the insulating film 11 can be a polyimide insulating film 11, a polyester insulating film 11 or a polycarbonate insulating film 11.

[0100] As Figure 3 and Figure 12 shown, the battery module 3 includes a plurality of parallelly arranged battery cells, and the battery cells are soft-pack battery cells. Each battery cell includes a film shell, an electrode assembly and a tab 15. The tab 15 is led out of the battery cell shell from one side in the height direction of the electrode assembly, and the film shell and the tab 15 are coated and connected through a tab adhesive layer 14; the tab adhesive layer 14 includes a first layer 141, a second layer 142 and a third layer 143 which are sequentially stacked. Among them, the melting point S1 of the first layer 141, the melting point S2 of the second layer 142, and the melting point S3 of the third layer 143 satisfy: S1 < S2, S3 < S2, and the melting point S1 of the first layer 141 and the melting point S3 of the third layer 143 satisfy: 80°C < S1 ≤ 135°C, S1 = S3, and the melting point S4 of the PP layer of the film shell is 155 - 175°C. It should be noted that the "melting point" refers to the temperature at which a substance changes from a solid state to a liquid state, that is, when the substance is heated to the melting point, it will start to melt.

[0101] During operation, the soft-pack battery continuously generates gas due to side reactions (e.g., electrolyte decomposition, SEI / CEI membrane recombination, lithium salt decomposition, moisture reaction, etc.). When the gas pressure reaches a certain level, it can break through weak points in the cell's encapsulation, such as the junction between the tab 15 and the PP layer of the casing. In this embodiment, the battery pack uses a layered tab adhesive layer 14, with each layer having a corresponding melting point (S2 > S1 = S3). Even if the battery pack experiences a short circuit due to a drop, causing a temperature increase inside the cell, or under high-temperature conditions, the first layer 141 and the third layer 143 can melt upon heating, absorbing some of the heat within the cavity and releasing the gas generated inside, preventing explosions, fires, or other dangerous situations. The second layer 142 retains its adhesiveness, preventing the tab adhesive layer 14 from losing its bonding strength and fixing function to the tab 15 due to a low melting point.

[0102] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications or equivalent substitutions made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

[0103] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0104] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0105] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0106] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0107] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0108] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A battery pack, characterized by, include: The upper housing has an exhaust port on its outer surface; The lower housing is sealed to the upper housing and forms an accommodating cavity inside, the accommodating cavity being connected to the exhaust port; A battery module, wherein the battery module is disposed within the accommodating cavity; The BMS board is disposed on the battery module along the height direction of the battery pack, and the BMS board is mounted on the upper housing; A communication pin, the first end of which is electrically connected to the BMS board, and the tail end of which extends in a direction parallel to the plane of the BMS board and beyond the BMS board. A first conductive bus and a second conductive bus, each of the first conductive bus and the second conductive bus being connected to the BMS board, and each of the first conductive bus and the second conductive bus extending out of the BMS board along a direction parallel to the board plane and toward the exhaust port, wherein at least a portion of the exhaust port projection is located between the first conductive bus and the second conductive bus in the orthographic projection of the plane containing the exhaust port. A switching unit is disposed on the BMS board and is located between the first conductive busbar and the second conductive busbar.

2. The battery pack according to claim 1, characterized in that, The switching unit is located on the side of the BMS board near the exhaust port, and the switching unit and the exhaust port are arranged opposite to each other in the length direction of the battery pack.

3. The battery pack according to claim 2, characterized in that, The first conductive bus and the second conductive bus are welded to the BMS board at a distance from each other in the width direction of the battery pack, and the distance between the portion of each of the first conductive bus and the second conductive bus extending out of the BMS board in the width direction of the battery pack gradually increases or remains constant along the direction from the BMS board to the exhaust port. And / or, each of the first conductive bus and the second conductive bus includes a connected base portion and an extension portion, the base portion being at least partially connected to the BMS board, the base portion extending along the length direction of the battery pack, the extension portion extending along the width direction of the battery pack, and the base portion and the extension portion having a chamfered portion at the connection.

4. The battery pack according to claim 2, characterized in that, The BMS board has multiple heat dissipation holes in the area near the first and second conductive bars; The first conductive busbar covers at least a portion of the plurality of heat dissipation holes; and / or The second conductive busbar covers at least a portion of the plurality of heat dissipation holes.

5. The battery pack according to claim 1, characterized in that, It also includes an input port disposed on the inner surface of the upper housing, and an output port disposed on the outer surface of the upper housing. The communication pin extends from the input port to the output port. The cross-section formed along the length direction perpendicular to the battery pack is smaller than the cross-section of the input port. And / or, the voltage of the communication pin is below 10V.

6. The battery pack according to claim 1, characterized in that, At least one of the first conductive bar and the second conductive bar is provided with a convex portion, and the BMS board is provided with a fitting hole, and the convex portion is fitted into the fitting hole; And / or, it further includes a plurality of TVS tubes, and the plurality of TVS tubes are arranged on one side of the BMS board facing the battery module.

7. The battery pack according to claim 6, wherein Both the convex portion and the fitting hole have a plurality of them. The plurality of convex portions are arranged at intervals along the length direction of the battery pack, and the plurality of convex portions are correspondingly arranged in the plurality of fitting holes one by one. One of the plurality of fitting holes is a circular fitting hole, and the other fitting hole is an oval-shaped fitting hole.

8. The battery pack according to claim 6, wherein In the projection in the height direction of the battery pack, the projections of the plurality of TVS tubes fall into the projection of the first conductive bar and / or the projection of the second conductive bar; And / or, the distance between the TVS tube and the fitting hole is less than 10 mm.

9. The battery pack according to any one of claims 1-8, wherein The BMS board is connected to the upper housing by self-tapping screws; And / or, the battery module includes a plurality of juxtaposed battery cells, and the battery cells are soft-pack battery cells; And / or, it further includes an insulating film, and the insulating film is arranged between the battery module and the BMS board.

10. The battery pack according to claim 9, wherein The battery cell includes a film shell, an electrode assembly and a tab. The tab is led out of the battery cell shell from one side of the electrode assembly in the height direction, and the film shell and the tab are coated and connected through the tab adhesive layer; The tab adhesive layer includes a first layer, a second layer and a third layer which are sequentially laminated. Among them, the melting point S1 of the first layer, the melting point S2 of the second layer, and the melting point S3 of the third layer satisfy: S1 < S2, S3 < S2, and the melting point S1 of the first layer and the melting point S3 of the third layer satisfy: 80°C < S1 ≤ 135°C, S1 = S3, and the melting point S4 of the PP layer of the film shell is 155-175°C.

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