Battery pack

Abstract

The utility model relates to the technical field of new energy batteries, in particular to a battery pack. The battery pack comprises a power module, a first busbar, a second busbar and a communication wire harness. The power module is provided with a first side face and a second side face which are opposite, the positive electrode of the power module and the negative electrode of the power module are arranged on the first side face, and the first connector of the power module is arranged on the second side face. The first busbar is at least partially arranged on the side, away from the second side face, of the first side face, one end of the first busbar is electrically connected with the positive electrode of the power module, and the other end of the first busbar is electrically connected with the second connector. The second busbar is at least partially arranged on the side, away from the second side face, of the first side face, one end of the second busbar is electrically connected with the negative electrode of the power module, and the other end of the second busbar is electrically connected with the third connector. The communication wire harness is at least partially arranged on the side, away from the first side face, of the second side face, one end of the communication wire harness is electrically connected with the first connector, and the other end is electrically connected with the fourth connector.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery technology, and in particular to a battery pack. Background Technology

[0002] Battery packs provide energy for vehicle operation, and their internal components consist of numerous battery cells connected in series and parallel to form modules. Battery packs for rail transit are also currently playing a power source role in the field of hybrid powertrain retrofitting of locomotives.

[0003] In the prior art, the high-voltage busbar inside the battery pack is usually close to the low-voltage wiring harness, which causes the high-voltage busbar to generate strong electromagnetic interference to the low-voltage wiring harness, thereby affecting the signal transmission in the low-voltage wiring harness. Utility Model Content

[0004] This invention provides a battery pack for reducing the electromagnetic interference caused by high-voltage busbars to low-voltage wiring harnesses.

[0005] This utility model provides a battery pack, comprising:

[0006] A power module having a first side and a second side facing away from each other, the positive terminal and the negative terminal of the power module being disposed on the first side, and the first connector of the power module being disposed on the second side;

[0007] The first busbar is at least partially disposed on the side of the first side away from the second side, and one end of the first busbar is electrically connected to the positive terminal of the power module, and the other end is electrically connected to the second connector.

[0008] A second busbar, at least partially disposed on the side of the first side opposite to the second side, wherein one end of the second busbar is electrically connected to the negative terminal of the power module, and the other end is electrically connected to the third connector; and

[0009] A communication harness, wherein at least part of the communication harness is disposed on the side of the second side opposite to the first side, and one end of the communication harness is electrically connected to the first connector and the other end is electrically connected to the fourth connector.

[0010] In some embodiments, the system further includes a housing having a receiving cavity for accommodating the power module. The housing has opposing first and second sidewalls. The first sidewall has a first fixing bracket for fixing the first busbar, and the second sidewall has a second fixing bracket for fixing the communication harness.

[0011] In some embodiments, the system also includes an MSD and a third busbar, wherein one end of the second busbar away from the negative terminal of the power module is electrically connected to the MSD, one end of the third busbar is electrically connected to the MSD, and the other end is electrically connected to the third connector;

[0012] The enclosure also includes a third sidewall, which is connected between the first sidewall and the second sidewall. The second connector, the third connector, the fourth connector, and the MSD are all disposed on the third sidewall.

[0013] The cavity is provided with a third fixing bracket spaced apart from the third sidewall. The side surface of the third fixing bracket facing away from the third sidewall is used to fix the second busbar. The third busbar is fixed between the third fixing bracket and the third sidewall.

[0014] In some implementations, it also includes:

[0015] A limiting block, wherein the limiting block is disposed on the third sidewall; and

[0016] An insulating block is disposed on the third sidewall. The insulating block has a first surface and a second surface facing away from each other. The first surface is provided with a limiting groove for accommodating the limiting block, and the second surface is used to fix the second connector and the third connector.

[0017] In some embodiments, the second connector has a first connecting portion and a second connecting portion connected together, the first connecting portion being disposed on the third sidewall, the second connecting portion being disposed on the second surface, the extending direction of the second connecting portion being parallel to the third sidewall, and the first busbar being electrically connected to the second connecting portion;

[0018] The third connector has a third connecting portion and a fourth connecting portion connected together. The third connecting portion is disposed on the third sidewall, and the fourth connecting portion is disposed on the second surface. The extending direction of the fourth connecting portion is parallel to the third sidewall, and the MSD is electrically connected to the fourth connecting portion.

[0019] In some embodiments, the third sidewall is provided with mounting holes; the battery pack further includes:

[0020] A first mounting plate is disposed within the receiving cavity;

[0021] A second mounting plate is connected between the bottom surface of the first mounting plate and the third side wall;

[0022] A third mounting plate, wherein the third mounting plate is connected between the side of the first mounting plate and the third sidewall; and

[0023] BMU, which is detachably mounted on the first mounting plate.

[0024] In some implementations, it also includes:

[0025] A liquid-cooled plate, the liquid-cooled plate connecting the first sidewall and the second sidewall, the liquid-cooled plate and the first sidewall and the second sidewall forming the receiving cavity; and

[0026] A heat-conducting layer is located between the liquid cooling plate and the power module.

[0027] In some embodiments, the number of power modules is at least two, and the first sides of at least two power modules have the same orientation; the battery pack also includes a fourth busbar for connecting two adjacent power modules in series, the fourth busbar being disposed on the side of the first side away from the second side.

[0028] In some embodiments, the power module includes battery cells and a CCS, wherein the CCS includes:

[0029] Support frame, the support frame being mounted on the battery cell;

[0030] A cover, the cover being mounted on the side of the support frame opposite to the battery cell; and

[0031] The FPC includes a wiring harness panel and the first connector. The wiring harness panel is disposed between the support frame and the cover. The first connector is soldered to the wiring harness panel for electrical connection with the wiring harness panel.

[0032] In some embodiments, the support frame is provided with welding holes, through which the terminals of the battery cell pass; the CCS also includes a plate, which is disposed between the cover and the support frame, and the plate is welded to the terminal of the battery cell; the support frame is also provided with a clearance groove, which is used to avoid detection components that detect the plate.

[0033] This application provides a battery pack that, compared with the prior art, has at least the following advantages:

[0034] The positive and negative terminals of the power module are both located on the first side of the power module, and the first connector is located on the second side opposite to the first side. This makes the first busbar electrically connected to the positive terminal of the power module and the second busbar electrically connected to the negative terminal of the power module located on the side of the first side away from the second side, while the communication harness electrically connected to the first connector is located on the side of the second side away from the first side. This increases the distance between the communication harness and the first busbar and the distance between the communication harness and the second busbar, reducing the electromagnetic interference caused by the strong magnetic field generated by the first and second busbars when transmitting large currents, and ensuring the signal transmission effect of the communication harness. Attached Figure Description

[0035] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0036] Figure 1 This is an exploded view of the battery pack in an embodiment of this application;

[0037] Figure 2 This is a structural schematic diagram of the box body from a first-view perspective in an embodiment of this application;

[0038] Figure 3 This is a structural schematic diagram of the box body in the embodiment of this application from a second perspective;

[0039] Figure 4 This is a schematic diagram of the insulating block structure in an embodiment of this application;

[0040] Figure 5 This is a schematic diagram of the structure of the second connector and the third connector in the embodiments of this application;

[0041] Figure 6 This is an exploded view of the power module in an embodiment of this application;

[0042] Figure 7 This is an exploded view of the CCS in the embodiments of this application;

[0043] Figure 8 This is a schematic diagram of the FPC structure in the embodiments of this application;

[0044] Figure 9 This is a schematic diagram of the support frame in an embodiment of this application.

[0045] Figure label:

[0046] 100-battery pack;

[0047] 1-Power module; 11-Battery cell; 12-CCS; 121-Support frame; 1211-Welding hole; 1212-Allowing groove; 122-Cover; 123-FPC; 1231-Wire harness panel; 1232-Voltage acquisition piece; 1233-Temperature acquisition device; 124-Bar plate;

[0048] 1a - First side view; 1c - Third side view;

[0049] 11-First connector; 12-Second connector; 121-First connecting part; 122-Second connecting part; 13-Third connector; 131-Third connecting part; 132-Fourth connecting part; 14-Fourth connector;

[0050] 21-First motherboard; 22-Second motherboard; 23-Third motherboard; 24-Fourth motherboard;

[0051] 41-Box body; 41a-Receiving cavity; 411-First side wall; 412-Second side wall; 413-Third side wall; 4131-Mounting hole; 414-Fourth side wall; 415-First fixing bracket; 416-Second fixing bracket; 417-Third fixing bracket; 418-Liquid cooling plate; 4191-First water nozzle; 4192-Second water nozzle;

[0052] 42-Box lid; 43-Sealing gasket; 44-Fire detector; 45-Fire sprinkler head;

[0053] 51-MSD; 52-BMU;

[0054] 71-Limiting block; 72-Insulating block; 721-First surface; 722-Second surface; 723-Limiting groove;

[0055] 81 - First mounting plate. Detailed Implementation

[0056] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0057] In this application, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0058] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0059] The technical solution of this application will be further described below with reference to specific embodiments and accompanying drawings.

[0060] Please see Figure 1 This application provides a battery pack 100, including a power module 1, a first busbar 21, a second busbar 22, and a communication harness (not shown in the figure). The power module 1 has a first side and a second side (not shown in the figure) facing away from each other. The positive and negative terminals of the power module 1 are both disposed on the first side, and the first connector 11 of the power module 1 is disposed on the second side. The first busbar 21 is at least partially disposed on the side of the first side facing away from the second side, and one end of the first busbar 21 is electrically connected to the positive terminal of the power module 1, and the other end is electrically connected to the second connector 12. The second busbar 22 is at least partially disposed on the side of the first side facing away from the second side, and one end of the second busbar 22 is electrically connected to the negative terminal of the power module 1, and the other end is electrically connected to the third connector 13. The communication harness is at least partially disposed on the side of the second side facing away from the first side, and one end of the communication harness is electrically connected to the first connector 11, and the other end is electrically connected to the fourth connector 14.

[0061] Among them, the first busbar 21 and the second busbar 22 are high-voltage busbars, the communication harness is a low-voltage harness, the second connector 12 is a positive high-voltage connector, the third connector 13 is a negative high-voltage connector, and the fourth connector 14 is a low-voltage connector.

[0062] In this embodiment, the first connector 11 receives signals such as voltage and temperature from the battery cell 11 of the power module 1, and transmits these signals to a monitoring device via a communication harness and a fourth connector 14 to continuously monitor the battery cell 11 of the power module 1. In some embodiments, the communication harness can be soldered to the fourth connector 14 to enhance the connection stability between the communication harness and the fourth connector 14, prevent loosening between them, and thus improve the reliability of the signal transmission from the communication harness.

[0063] In addition, the rail vehicle connects the second connector 12 and the third connector 13, so that the positive terminal of the power module 1, the first busbar 21, the second connector 12, the rail vehicle, the third connector 13, the second busbar 22 and the negative terminal of the power module 1 form a high-voltage circuit. That is, the large current of the power module 1 flows back to the negative terminal of the power module 1 through the positive terminal of the power module 1, the first busbar 21, the second connector 12, the rail vehicle, the third connector 13 and the second busbar 22 in sequence, so as to supply power to the rail vehicle.

[0064] It is understandable that, since the first busbar 21 and the second busbar 22 will generate strong magnetic fields when transmitting large currents, if the communication harness is close to the first busbar 21 or the second busbar 22, the strong magnetic field generated by the first busbar 21 or the second busbar 22 will cause strong electromagnetic interference to the communication harness, thereby affecting the transmission of signals by the communication harness. To address this issue, in this embodiment, both the positive and negative terminals of the power module 1 are located on the first side of the power module 1, and the first connector 11 is located on the second side opposite to the first side. This ensures that the first busbar 21, which is electrically connected to the positive terminal of the power module 1, is at least partially located on the side of the first side away from the second side, and the second busbar 22, which is electrically connected to the negative terminal of the power module 1, is also at least partially located on the side of the first side away from the second side. The communication harness, which is electrically connected to the first connector 11, is at least partially located on the side of the second side away from the first side. This increases the distance between the communication harness and the first busbar 21, and also increases the distance between the communication harness and the second busbar 22. This effectively reduces the electromagnetic interference caused by the strong magnetic field generated by the first busbar 21 and the second busbar 22 when transmitting large currents, thus ensuring the signal transmission effect of the communication harness.

[0065] It should be noted that both the first busbar 21 and the second busbar 22 can be partially located on the side of the first side away from the second side, and the communication harness can be partially located on the side of the second side away from the first side. Alternatively, both the first busbar 21 and the second busbar 22 can be entirely located on the side of the first side away from the second side, and the communication harness can be entirely located on the side of the second side away from the first side. No limitation is made here.

[0066] In the example of this application, the power module 1 also has a third side surface, which is connected between the first side surface and the second side surface. The second connector 12, the third connector 13, and the fourth connector 14 are all disposed directly opposite the third side surface. It should be noted that the second connector 12, the third connector 13, and the fourth connector 14 being disposed directly opposite the third side surface means that, under a projection perpendicular to the third side surface, the projections of the second connector 12, the third connector 13, and the fourth connector 14 all fall within the third side surface.

[0067] The second connector 12 can be located near the first side when projected perpendicular to the third side. Therefore, the end of the first busbar 21 away from the positive terminal of the power module 1 extends from the first side to the third side to connect to the second connector 12. Similarly, the third connector 13 can be located near the first side when projected perpendicular to the third side. Therefore, the end of the second busbar 22 away from the positive terminal of the power module 1 can extend from the first side to the third side to connect to the third connector 13. The fourth connector 14 can be located near the second side when projected perpendicular to the third side. Therefore, the end of the communication harness away from the first connector 11 extends from the second side to the third side to connect to the fourth connector 14. Understandably, the projections of the second connector 12 and the third connector 13 on the third side are close to the first side, and the projection of the fourth connector 14 on the third side is close to the second side. Therefore, the distance between the end of the communication harness used to connect the fourth connector 14 and the end of the first busbar 21 used to connect the second connector 12 is still relatively far. Similarly, the distance between the end of the communication harness used to connect the fourth connector 14 and the end of the second busbar 22 used to connect the third connector 13 is still relatively far. The strong magnetic field generated by the first busbar 21 and the second busbar 22 when transmitting large current will not cause strong electromagnetic interference to the communication harness, thus ensuring the signal transmission effect of the communication harness.

[0068] In other examples, the second connector 12 and the third connector 13 can be located on the side of the first side away from the second side, and the fourth connector 14 can be located on the side of the second side away from the first side. Therefore, the distance between the end of the communication harness used to connect the fourth connector 14 and the end of the first busbar 21 used to connect the second connector 12 is greater. Similarly, the distance between the end of the communication harness used to connect the fourth connector 14 and the end of the second busbar 22 used to connect the third connector 13 is greater. The strong magnetic field generated by the first busbar 21 and the second busbar 22 when transmitting large current will not cause strong electromagnetic interference to the communication harness, thus ensuring the effectiveness of the communication harness in transmitting signals.

[0069] Please continue reading. Figure 1 , Figure 2 and Figure 3In some embodiments, the battery pack 100 further includes a housing 41, which has a receiving cavity for accommodating the power module 1. The housing 41 has opposing first sidewalls 411 and second sidewalls 412. The first sidewall 411 is provided with a first fixing bracket 415 for fixing the first busbar 21, and the second sidewall 412 is provided with a second fixing bracket 416 for fixing the communication harness.

[0070] The housing 41 serves as a carrier for the power module 1. By placing the power module 1 inside the housing 41, the power module 1 can be protected.

[0071] When the power module 1 is installed in the receiving cavity, the first side of the power module 1 is adjacent to and approximately directly opposite the first side wall 411 of the housing 41, and the second side of the power module 1 is adjacent to and approximately directly opposite the second side wall 412 of the housing 41. The first busbar 21 is fixed by a first fixing bracket 415 provided on the first side wall 411, and the communication harness is fixed by a second fixing bracket 416 provided on the second side wall 412.

[0072] In the example of this application, the positive terminal of the power module 1 can be located near the edge of the first side away from the third side, while the negative terminal of the power module 1 can be located near the edge of the first side connecting the third side. Therefore, the length of the first busbar 21 extending on the first side is significantly greater than the length of the second busbar 22 on the second side. Therefore, only the first fixing bracket 415 for fixing the first busbar 21 can be provided on the first sidewall 411.

[0073] In some embodiments, the battery pack 100 also includes a cover 42 and a sealing gasket 43. When the power module 1 is installed in the receiving cavity, the cover 42 is installed on the housing 41, and the sealing gasket 43 is disposed between the cover 42 and the housing 41 to seal the receiving cavity. In addition, a fire detector 44 and a fire sprinkler head 45 are provided on the cover 42. When the fire detector 44 detects a fire in the battery pack 100, the fire sprinkler head 45 can be opened to extinguish the fire in time.

[0074] Please continue reading. Figure 1 , Figure 2 and Figure 3In some embodiments, the battery pack 100 further includes an MSD51 (Manual Service Disconnect) and a third busbar 23. One end of the second busbar 22, away from the negative terminal of the power module 1, is electrically connected to the MSD51. One end of the third busbar 23 is electrically connected to the MSD51, and the other end is electrically connected to the third connector 13. The housing 41 also includes a third sidewall 413, which is connected between the first sidewall 411 and the second sidewall 412. The second connector 12, the third connector 13, the fourth connector 14, and the MSD51 are all disposed on the third sidewall 413. A third fixing bracket 417, spaced apart from the third sidewall 413, is provided within the receiving cavity. The surface of the third fixing bracket 417 facing away from the third sidewall 413 is used to fix the second busbar 22. The third busbar 23 is fixed between the third fixing bracket 417 and the third sidewall 413.

[0075] In this embodiment, the positive terminal of power module 1, the first busbar 21, the second connector 12, the rail vehicle, the third connector 13, the third busbar 23, MSD51, the second busbar 22, and the negative terminal of power module 1 form a high-voltage circuit. By setting MSD51 in the high-voltage circuit, when the battery pack 100 needs maintenance, MSD51 can quickly disconnect the high-voltage circuit to ensure the safety of maintenance work.

[0076] In this example, when the power module 1 is installed in the receiving cavity, the third side of the power module 1 is approximately adjacent to and directly opposite the third sidewall 413 of the housing 41. The projection of the second connector 12 on the third side can be located at the middle of the third side, and the projection of the third connector 13 on the third side can be located near the bottom wall of the receiving cavity, thus maintaining a certain distance between the second connector 12 and the third connector 13 to prevent interference between them. Furthermore, since the negative terminal of the power module 1 can be located near the edge where the first side connects to the third side, the third fixing bracket 417 can be provided only on the bottom wall of the receiving cavity to fix the second busbar 22. For example, the surface of the third fixing bracket 417 facing away from the third sidewall 413 is used to fix the second busbar 22, and the third busbar 23 is fixed between the third fixing bracket 417 and the third sidewall 413. That is, the third fixing bracket 417 separates and fixes the second busbar 22 and the third busbar 23.

[0077] Please refer to the following: Figure 1 , Figure 3 and Figure 4In some embodiments, the battery pack 100 further includes a limiting block 71 and an insulating block 72. The limiting block 71 is disposed on the third sidewall 413. The insulating block 72 is disposed on the third sidewall 413 and has a first surface 721 and a second surface 722 facing away from each other. The first surface 721 is provided with a limiting groove 723 for accommodating the limiting block 71, and the second surface 722 is used to fix the second connector 12 and the third connector 13.

[0078] During the installation of the limiting block 71 and the insulating block 72, the limiting block 71 is first installed on the third side wall 413, and then the limiting groove 723 of the insulating block 72 is aligned with the limiting block 71 for installation, so that the limiting block 71 is accommodated in the limiting groove 723. The limiting block 71 can limit the insulating block 72, preventing the insulating block 72 from rotating or shifting when the second connector 12 and the third connector 13 are installed on the second surface 722, thereby avoiding the internal copper plates of the second connector 12 and the third connector 13 from rotating or shifting, and enhancing the reliability of the second connector 12 and the third connector 13.

[0079] Please refer to the following: Figure 1 and Figure 5 In some embodiments, the second connector 12 has a first connecting portion 121 and a second connecting portion 122 connected together. The first connecting portion 121 is disposed on the third sidewall 413, and the second connecting portion 122 is disposed on the second surface 722. The extending direction of the second connecting portion 122 is parallel to the third sidewall 413, and the first busbar 21 is electrically connected to the second connecting portion 122. The third connector 13 has a third connecting portion 131 and a fourth connecting portion 132 connected together. The third connecting portion 131 is disposed on the third sidewall 413, and the fourth connecting portion 132 is disposed on the second surface 722. The extending direction of the fourth connecting portion 132 is parallel to the third sidewall 413, and the MSD51 is electrically connected to the fourth connecting portion 132.

[0080] The second connecting part 122 and the third connecting part 131 can be generally plate-shaped structures.

[0081] In this embodiment, the first connecting portion 121 is disposed on the third sidewall 413 and is used for electrical connection with the rail vehicle. The second connecting portion 122 is disposed on the second surface 722 and is electrically connected to the first busbar 21. The extending direction of the second connecting portion 122 is approximately parallel to the third sidewall 413, thereby forming a structure where the second connector 12 is not directly facing the power module 1. Since the third sidewall 413 is approximately parallel to the third side of the power module 1, even if the housing 41 is impacted and the second connector 12 collides with the power module 1, it is the second connecting portion 122 of the second connector 12 that collides with the power module 1, which can prevent the first connecting portion 121 of the second connector 12 from piercing the power module 1, thus enhancing the safety of the battery pack 100.

[0082] Similarly, the third connecting portion 131 is disposed on the third sidewall 413 and is used for electrical connection with the rail vehicle. The fourth connecting portion 132 is disposed on the second surface 722 and is electrically connected to the MSD51. The extending direction of the fourth connecting portion 132 is approximately parallel to the third sidewall 413, thereby forming a structure where the third connector 13 is not directly facing the power module 1. Since the third sidewall 413 is approximately parallel to the third sidewall of the power module 1, even if the housing 41 is impacted and the third connector 13 collides with the power module 1, it is the fourth connecting portion 132 of the third connector 13 that collides with the power module 1, which can prevent the third connecting portion 131 of the third connector 13 from piercing the power module 1, thus enhancing the safety of the battery pack 100.

[0083] Please refer to the following: Figure 1 and Figure 3 In some embodiments, the third sidewall 413 is provided with mounting holes 4131. The battery pack 100 also includes a first mounting plate 81, a second mounting plate (not shown in the figure), a third mounting plate (not shown in the figure), and a BMU52 (Battery Monitoring Unit). The first mounting plate 81 is disposed within the receiving cavity, the second mounting plate is connected between the bottom surface of the first mounting plate 81 and the third sidewall 413, the third mounting plate is connected between the side surface of the first mounting plate 81 and the third sidewall 413, and the BMU52 is detachably disposed on the first mounting plate 81.

[0084] The first mounting plate 81 is disposed within the receiving cavity and is approximately parallel to the third side wall 413. A gap is formed between the first mounting plate 81 and the third side wall 413 to allow the wiring harness of the BMU52 to extend into the receiving cavity and electrically connect to the power module 1. When the BMU52 is detachably mounted on the first mounting plate 81, BMU52 maintenance, software upgrades, and troubleshooting can be performed without opening the housing 41.

[0085] The second mounting plate is connected between the bottom surface of the first mounting plate 81 and the third side wall 413, and the third mounting plate is connected between the side surface of the first mounting plate 81 and the third side wall 413. This makes the gap between the top surface of the first mounting plate 81 and the third side wall 413 the only gap for the wiring harness of the BMU52 to extend into the receiving cavity and make electrical connection with the power module 1. Therefore, the second mounting plate and the third mounting plate can prevent foreign objects from falling into the receiving cavity when performing BMU52 maintenance, software upgrades and troubleshooting.

[0086] Please refer to it again. Figure 1 , Figure 2 and Figure 3 In some embodiments, the battery pack 100 further includes a liquid cooling plate 418 and a heat-conducting layer (not shown in the figure). The liquid cooling plate 418 connects the first sidewall 411 and the second sidewall 412, and the liquid cooling plate 418, the first sidewall 411, and the second sidewall 412 form a receiving cavity. The heat-conducting layer is located between the liquid cooling plate 418 and the power module 1.

[0087] The battery pack 100 also includes a fourth sidewall 414 opposite to the third sidewall 413. The fourth sidewall 414 is connected between the first sidewall 411 and the second sidewall 412. The liquid cooling plate 418 serves as the bottom wall of the housing 41 and is connected to the first sidewall 411, the second sidewall 412, the third sidewall 413, and the fourth sidewall 414. The liquid cooling plate 418, the first sidewall 411, the second sidewall 412, the third sidewall 413, and the fourth sidewall 414 together form a receiving cavity. The liquid cooling plate 418 can be welded to the first sidewall 411, the second sidewall 412, the third sidewall 413, and the fourth sidewall 414, or it can be connected in other ways, which are not limited here.

[0088] The heat-conducting layer can enhance the heat exchange efficiency between the liquid cooling plate 418 and the power module 1, enabling the liquid cooling plate 418 to exchange heat efficiently with the power module 1 and ensuring that the power module 1 operates at a suitable ambient temperature.

[0089] In some embodiments, the third sidewall 413 may be provided with a first water nozzle 4191 and a second water nozzle 4192. Both the first water nozzle 4191 and the second water nozzle 4192 are connected to the liquid cooling plate 418. The coolant used for heat exchange with the battery cell 11 can flow into the liquid cooling plate 418 through the first water nozzle 4191, and after heat exchange with the battery cell 11 in the liquid cooling plate 418, it flows out of the liquid cooling plate 418 through the second water nozzle 4192. The first water nozzle 4191 and the second water nozzle 4192 can be welded to the third sidewall 413, and the structure of the first water nozzle 4191 and the second water nozzle 4192 for connecting to the external liquid cooling pipe can be provided with threads or flanges.

[0090] Please refer to it again. Figure 1In some embodiments, the number of power modules 1 is at least two, and the first sides of at least two power modules 1 have the same orientation. The battery pack 100 also includes a fourth busbar 24 for connecting two adjacent power modules 1 in series, the fourth busbar 24 being disposed on the side of the first side away from the second side.

[0091] In this embodiment, at least two power modules 1 are arranged along a preset direction, and two adjacent power modules 1 are connected in series through a fourth busbar 24, thereby connecting at least two power modules 1 in series.

[0092] It is understandable that the fourth busbar 24 is also a high-voltage busbar. Therefore, the first busbar 21 will also generate a strong magnetic field when transmitting large current. By placing the fourth busbar 24 on the side away from the second side of the first side, the distance between the communication harness and the fourth busbar 24 is increased, reducing the electromagnetic interference caused by the strong magnetic field generated by the fourth busbar 24 when transmitting large current to the communication harness, and ensuring the signal transmission effect of the communication harness.

[0093] Please refer to the following: Figure 6 , Figure 7 and Figure 8 In some embodiments, the power module 1 includes a battery cell 11 and a CCS 12 (Cell Connection System). The CCS 12 includes a support frame 121, a cover 122, and an FPC 123 (Flexible Printed Circuit). The support frame 121 is mounted on the battery cell 11, and the cover 122 is mounted on the side of the support frame 121 opposite to the battery cell 11. The FPC 123 includes a wiring harness panel 1231 and a first connector 11. The wiring harness panel 1231 is disposed between the support frame 121 and the cover 122, and the first connector 11 is soldered to the wiring harness panel 1231 for electrical connection.

[0094] The cover 122 is connected to the side of the support frame 121 away from the battery cell 11 so that the FPC 123 can be installed between the support frame 121 and the cover 122.

[0095] In some more specific embodiments, FPC123 further includes a voltage acquisition chip 1232 and a temperature acquisition device 1233, both electrically connected to the wiring harness panel 1231. The voltage acquisition chip 1232 acquires the voltage of the battery cell 11 and generates a voltage signal, which is transmitted to the wiring harness panel 1231. The temperature acquisition device 1233 acquires the temperature of the battery cell 11 and generates a temperature signal, which is also transmitted to the wiring harness panel 1231. After receiving the voltage and temperature signals from the battery cell 11, the wiring harness panel 1231 transmits them to a monitoring device via the first connector 11, the communication harness, and the fourth connector 14 to continuously monitor the voltage and temperature of the battery cell 11.

[0096] In this embodiment, welding the first connector 11 to the wire harness panel 1231 can improve the connection stability between the first connector 11 and the wire harness panel 1231, thereby improving the stability of the electrical connection between the first connector 11 and the wire harness panel 1231 and ensuring the vibration resistance and reliability of the CCS12.

[0097] Please refer to the following: Figure 7 and Figure 9 In some embodiments, the support frame 121 is provided with welding holes 1211, through which the terminals of the battery cell 11 pass. The CCS 12 also includes a strip 124, which is disposed between the cover 122 and the support frame 121 and is welded to the terminals of the battery cell 11. The support frame 121 is also provided with a clearance groove 1212, which is used to avoid detection components that inspect the strip 124.

[0098] The power module 1 generally includes multiple battery cells 11, which are connected in series and in parallel through a plate 124 to form the power supply structure of the power module 1.

[0099] It is understood that the electrical connection between the electrode plate 124 and the terminal of the battery cell 11 is generally achieved by welding. However, if there are defects such as weak welding between the electrode plate 124 and the battery cell 11, the power module 1 may fail to supply power to the rail vehicle normally. To solve this problem, in this embodiment, multiple clearance slots 1212 are provided in the support frame 121. The multiple clearance slots 1212 correspond one-to-one with multiple electrode plates 124. Each clearance slot 1212 is located adjacent to the corresponding electrode plate 124. The detection component can use the clearance slots 1212 to check whether the electrode plate 124 and the terminal of the battery cell 11 are firmly welded. For example, the detection component can be a pry bar. The pry bar can abut against the electrode plate 124 through the clearance slot 1212 to check the welding quality of the electrode plate 124 and avoid unstable welding of the electrode plate 124.

[0100] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery pack, characterized in that, include: A power module having a first side and a second side facing away from each other, the positive terminal and the negative terminal of the power module being disposed on the first side, and the first connector of the power module being disposed on the second side; The first busbar is at least partially disposed on the side of the first side away from the second side, and one end of the first busbar is electrically connected to the positive terminal of the power module, and the other end is electrically connected to the second connector. The second busbar is at least partially disposed on the side of the first side away from the second side, and one end of the second busbar is electrically connected to the negative terminal of the power module, and the other end is electrically connected to the third connector. as well as A communication harness, wherein at least part of the communication harness is disposed on the side of the second side opposite to the first side, and one end of the communication harness is electrically connected to the first connector and the other end is electrically connected to the fourth connector.

2. The battery pack according to claim 1, characterized in that, It also includes a housing, which has a receiving cavity for accommodating the power module. The housing has a first side wall and a second side wall opposite to each other. The first side wall is provided with a first fixing bracket for fixing the first busbar, and the second side wall is provided with a second fixing bracket for fixing the communication harness.

3. The battery pack according to claim 2, characterized in that, It also includes an MSD and a third busbar. One end of the second busbar, away from the negative terminal of the power module, is electrically connected to the MSD. One end of the third busbar is electrically connected to the MSD, and the other end is electrically connected to the third connector. The enclosure also includes a third sidewall, which is connected between the first sidewall and the second sidewall. The second connector, the third connector, the fourth connector, and the MSD are all disposed on the third sidewall. The cavity is provided with a third fixing bracket spaced apart from the third sidewall. The side surface of the third fixing bracket facing away from the third sidewall is used to fix the second busbar. The third busbar is fixed between the third fixing bracket and the third sidewall.

4. The battery pack according to claim 3, characterized in that, Also includes: A limiting block is disposed on the third side wall; as well as An insulating block is disposed on the third sidewall. The insulating block has a first surface and a second surface facing away from each other. The first surface is provided with a limiting groove for accommodating the limiting block, and the second surface is used to fix the second connector and the third connector.

5. The battery pack according to claim 4, characterized in that, The second connector has a first connecting portion and a second connecting portion connected together. The first connecting portion is disposed on the third sidewall, and the second connecting portion is disposed on the second surface. The extending direction of the second connecting portion is parallel to the third sidewall, and the first busbar is electrically connected to the second connecting portion. The third connector has a third connecting portion and a fourth connecting portion connected together. The third connecting portion is disposed on the third sidewall, and the fourth connecting portion is disposed on the second surface. The extending direction of the fourth connecting portion is parallel to the third sidewall, and the MSD is electrically connected to the fourth connecting portion.

6. The battery pack according to claim 3, characterized in that, The third sidewall is provided with mounting holes; the battery pack also includes: A first mounting plate is disposed within the receiving cavity; A second mounting plate is connected between the bottom surface of the first mounting plate and the third side wall; A third mounting plate, wherein the third mounting plate is connected between the side of the first mounting plate and the third sidewall; and BMU, which is detachably mounted on the first mounting plate.

7. The battery pack according to claim 2, characterized in that, Also includes: A liquid cooling plate, which connects the first sidewall and the second sidewall, and the liquid cooling plate, together with the first sidewall and the second sidewall, forms the receiving cavity; as well as A heat-conducting layer is located between the liquid cooling plate and the power module.

8. The battery pack according to any one of claims 1-7, characterized in that, The number of power modules is at least two, and the first side of at least two power modules has the same orientation; the battery pack also includes a fourth busbar for connecting two adjacent power modules in series, and the fourth busbar is disposed on the side of the first side away from the second side.

9. The battery pack according to any one of claims 1-7, characterized in that, The power module includes battery cells and a CCS (cell-cell system), the CCS including: Support frame, the support frame being mounted on the battery cell; A cover, the cover being mounted on the side of the support frame opposite to the battery cell; and The FPC includes a wiring harness panel and the first connector. The wiring harness panel is disposed between the support frame and the cover. The first connector is soldered to the wiring harness panel for electrical connection with the wiring harness panel.

10. The battery pack according to claim 9, characterized in that, The support frame is provided with welding holes, and the terminal of the battery cell passes through the welding holes; the CCS also includes a plate, which is disposed between the cover and the support frame, and the plate is welded to the terminal of the battery cell; the support frame is also provided with a clearance groove, which is used to avoid the detection device for detecting the plate.

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