Battery pack and energy storage system

Abstract

The invention provides a battery pack and an energy storage system. The battery pack may include a housing, a cell busbar, and a plurality of cells. An access hole and a cover plate are arranged at the top of the shell, and the cover plate seals the access hole. A pole is arranged at the top of the battery cell, the battery cell busbar is connected with the pole, and the connection point of the battery cell busbar and the pole faces the access hole. And when the battery pack works normally, the cover plate covers the access hole. When the battery pack breaks down, the access hole can be exposed by opening the cover plate. The electrical connection state of the connection points can be directly checked through the access hole, the connection points can be overhauled, the operation is simple and convenient, the whole shell does not need to be disassembled, and therefore the overhauling process is simplified.

Description

Technical Field

[0001] This application relates to the field of energy technology, and in particular to a battery pack and energy storage system. Background Technology

[0002] Currently, residential energy storage battery packs typically employ a highly integrated, sealed structural design. To ensure the battery pack's dustproof and waterproof protection level as well as structural strength, most battery packs use a single sheet metal or engineering plastic casing, which integrates key components such as battery modules, battery management system (BMS), electrical connection cables, fuses, and contactors.

[0003] The internal electrical connections of a battery pack may include series and parallel copper busbars or cable connections between modules, terminal fastening points, etc. These electrical connections ensure the safe and stable operation of the battery pack. If these connections are loose, corroded, or have poor connections, it can lead to increased contact resistance, which can cause localized overheating, arcing, or even fire under high current operating conditions. When a battery pack experiences faults such as abnormal voltage, impedance imbalance, or communication failures, it is usually necessary to check the internal electrical connections. Routine maintenance or diagnostics that require access to internal wiring often involve disassembling the entire battery pack casing. This process is not only cumbersome and time-consuming, requiring technicians to use specialized tools for disassembly and repair, but also carries a high risk of accidental damage to surrounding cables or components during disassembly and assembly. Summary of the Invention

[0004] This application provides a battery pack and energy storage system that allows for the inspection and maintenance of electrical connections within the battery pack via an access port, simplifying the maintenance process.

[0005] In a first aspect, this application provides a battery pack. The battery pack specifically includes a casing, a cell busbar, and multiple battery cells located within the casing. The casing has an access port and a cover plate at its top, with the cover plate sealing the access port. Each of the multiple battery cells has a terminal post at its top. The cell busbar connects to the terminals of the multiple battery cells, with the connection point between the cell busbar and the terminals of the multiple battery cells facing the access port.

[0006] In the battery pack of this application, the outer casing is provided with a maintenance port. When the battery pack is working normally, a cover plate closes to the maintenance port to seal it, thus forming a sealed outer casing. When the battery pack malfunctions, the cover plate is opened to expose the maintenance port. Through the maintenance port, the electrical connection status of the connection points between the cell busbar and the terminal post can be directly viewed, and these connection points can be inspected and repaired. The operation is simple and does not require disassembling the entire outer casing, thus simplifying the maintenance process. Furthermore, to facilitate direct disassembly or installation of these connection points through the maintenance port, at least part of these connection points are exposed along the height direction of the battery pack; that is, the projection of the maintenance port along the height direction covers at least a portion of these connection points.

[0007] In one possible technical solution, the outer casing may include a first casing and a second casing, which are connected side-by-side along the width direction of the battery pack. A cell busbar and the aforementioned multiple cell units are located within the first casing, while an electronic control module is housed within the second casing. An inspection port and a cover are located at the top of the first casing. A positive electrode module busbar and a negative electrode module busbar are also provided within the outer casing. One end of the positive electrode module busbar is connected to the total positive terminal of the multiple cell units, and the other end extends into the second casing and connects to the electronic control module. One end of the negative electrode module busbar is connected to the total negative terminal of the multiple cell units, and the other end extends into the second casing and connects to the electronic control module. The connection points of the positive electrode module busbar to the total positive terminal and the negative electrode module busbar to the total negative terminal both face the inspection port, allowing for inspection of these connection points through the inspection port after opening the cover.

[0008] In practical applications, in addition to battery modules, the battery pack may also include an electronic control box. The electronic control module in the control box can be used to monitor, control, and protect the operation of the battery pack. Specifically, the first housing is used to house the battery modules, which include the aforementioned multiple battery cells and cell busbars. The second housing serves as the electronic control box. The total positive terminal of the battery modules is electrically connected to the electronic control module through a positive terminal module busbar, and the total negative terminal of the multiple battery modules is electrically connected to the electronic control module through a negative terminal module busbar. When the battery pack malfunctions, it may be necessary to disconnect the battery modules from the electronic control box. Through the access port, the positive terminal module busbar and the negative terminal module busbar can be removed from the battery modules, thereby disconnecting the battery modules from the electronic control module for maintenance of the battery modules.

[0009] In one possible technical solution, a partition is provided between the first and second housings to isolate the multiple battery cells and the electronic control module, thereby achieving electrical isolation. The positive and negative electrode module busbars respectively pass through the partition. The second housing has a first flue, which is isolated from the electronic control module. The inlet of the first flue is located in the partition and communicates with the first housing, while the outlet of the first flue is located at the top of the second housing. When thermal runaway occurs in a battery cell, the gas emitted by the battery module can enter the first flue through the inlet on the partition and exit through the outlet along the first flue without affecting the electronic control module, thus improving the safety of the battery pack.

[0010] In one possible technical solution, an explosion-proof valve is installed at the outlet of the first flue. When the battery pack is operating normally, the top of the first housing is sealed by a cover plate, and the first flue is sealed by the explosion-proof valve to ensure the airtightness of the housing. When a cell experiences thermal runaway, the high-temperature gas generated by the faulty cell enters the first flue through an inlet on the separator, and the explosion-proof valve can be opened to release the pressure and gas in the battery pack.

[0011] In one possible technical solution, the inlet of the first flue includes multiple holes, and the aforementioned array of holes is distributed on the partition. These holes can isolate larger particles (such as positive electrode material and negative electrode material) and prevent these particles from being ejected with the airflow.

[0012] In one possible technical solution, the second housing also includes a second flue, which is isolated from the electronic control module. The inlet of the second flue is located at the bottom of the second housing, and the outlet is located at the top of the second housing, extending through the second housing along its height. The battery pack of this application can be applied to an energy storage system. The cabinet of the energy storage system includes multiple battery packs, which can be stacked along the height of the cabinet, with the height of the battery packs being the same as the height of the cabinet. When a lower battery pack experiences thermal runaway, the gas discharged from the lower battery pack can enter the second flue of the upper battery pack, and thus be discharged from the outlet of the second flue of the topmost battery pack, preventing high-temperature gas from accumulating around the faulty battery pack.

[0013] In one possible technical solution, the second housing further includes a first power terminal and a second power terminal, with the first power terminal located at the top of the second housing and the second power terminal located at the bottom of the second housing. The second housing includes a first side and a second side opposite to each other along the length of the battery pack. The first and second flues are arranged along the length and positioned close to the first side. The first and second power terminals are positioned close to the second side. In this way, one side of the electrical control box is used for exhaust, and the other side is used for electrical connection, achieving electrical isolation.

[0014] In one possible technical solution, a first power terminal has a first latching portion, and a second power terminal has a second latching portion. In this solution, the first latching portion and the second latching portion are mating. When multiple battery packs are stacked, the second latching portion of the second power terminal of the upper battery pack can engage with the first latching portion of the first power terminal of the lower battery pack. This allows adjacent battery packs to be relatively fixed when stacked. Specifically, the first latching portion can be located on the inner wall of the first power terminal, and the second latching portion can be located on the outer wall of the second power terminal; or, the first latching portion can be located on the outer wall of the first power terminal, and the second latching portion can be located on the inner wall of the second power terminal. In another possible technical solution, the first latching portion can be a protrusion, and the second latching portion can be a groove. When the second latching portion of the upper battery pack is inserted into the first latching portion of the lower battery pack, the protrusion can be accommodated and limited within the groove, thereby fixing the first power terminal and the second power terminal relatively.

[0015] In one possible technical solution, the positive electrode module busbar includes a copper busbar or a cable, and the negative electrode module busbar also includes a copper busbar or a cable. When the positive electrode module busbar is a copper busbar, both ends of the positive electrode module busbar can be connected to the main positive electrode / electrical control module via bolts. When the positive electrode module busbar is a cable, both ends of the cable are provided with ring terminals (also called open barrel terminals, or OT terminals for short), and the OT terminals at both ends of the cable are connected to the main positive electrode / electrical control module via bolts. When the negative electrode module busbar is a copper busbar, both ends of the negative electrode module busbar can be connected to the main negative electrode / electrical control module via bolts. When the negative electrode module busbar is a cable, both ends of the cable are provided with OT terminals, and the OT terminals at both ends of the cable are connected to the main negative electrode / electrical control module via bolts.

[0016] In one possible technical solution, a flexible circuit board is also provided inside the casing. The flexible circuit board is connected to the top of the cell busbar and faces the inspection port. The flexible circuit board can be used to collect and transmit cell status signals. Typically, the flexible circuit board is located on top of the cell busbar, and the cell busbar is electrically connected to the flexible circuit board. When the battery pack malfunctions, the flexible circuit board can be directly inspected or disassembled through the inspection port after opening the cover.

[0017] In one possible technical solution, the flexible circuit board has multiple openings, and each of the multiple battery cells has a pressure relief valve on its top, with the pressure relief valves facing the multiple openings and inspection ports. When a battery cell experiences thermal runaway, the pressure relief valve opens, allowing high-temperature gas to escape through the openings, thus preventing the flexible circuit board from blocking the gas escape.

[0018] In one possible technical solution, the area of ​​the access port is smaller than the area of ​​the top of the housing, in order to ensure the structural strength and sealing reliability of the housing.

[0019] In one possible technical solution, the top of the casing is further provided with a first inclined surface, and the bottom of the casing is further provided with a second inclined surface, with the first inclined surface parallel to the second inclined surface. Thus, when two battery packs are stacked, the first inclined surface contacts and moves relative to the second inclined surface, thereby guiding the second power terminal of the upper battery pack and the first power terminal of the lower battery pack to dock.

[0020] Secondly, this application also provides an energy storage system. The energy storage system includes a cabinet and multiple battery packs as described in the first aspect, with the battery packs stacked along the height of the cabinet. Each battery pack in the energy storage system has an inspection port, which is normally covered by a cover to ensure the battery pack's airtightness. When a battery pack in the energy storage system malfunctions, the cover of the malfunctioning battery pack can be opened to expose the inspection port. Through the inspection port, the electrical connection status of the connection points inside the battery pack can be directly viewed, and these connection points can be inspected and repaired. The operation is simple and does not require disassembling the entire casing, thus simplifying the battery pack maintenance process of the energy storage system. Attached Figure Description

[0021] Figure 1 A schematic diagram of an energy storage system provided in an embodiment of this application;

[0022] Figure 2 A schematic diagram of a battery pack provided in an embodiment of this application;

[0023] Figure 3 Another schematic diagram of the battery pack provided in the embodiments of this application;

[0024] Figure 4 An exploded view of the battery pack provided in an embodiment of this application;

[0025] Figure 5 A schematic diagram of the first housing provided in an embodiment of this application;

[0026] Figure 6 for Figure 2 Exploded view of the battery pack;

[0027] Figure 7 for Figure 3 Exploded view of the battery pack;

[0028] Figure 8 for Figure 6 Further exploded view of the battery pack;

[0029] Figure 9 This is a schematic diagram of a battery module provided in an embodiment of this application;

[0030] Figure 10 for Figure 9 Exploded view of the battery module;

[0031] Figure 11 A top view of the battery pack provided in an embodiment of this application;

[0032] Figure 12 This is a partial schematic diagram of a battery pack provided in an embodiment of this application;

[0033] Figure 13 A schematic diagram of the second housing provided in an embodiment of this application;

[0034] Figure 14 for Figure 13 An exploded view of the second shell;

[0035] Figure 15 for Figure 13 Another exploded view of the second shell;

[0036] Figure 16 An exploded view of the second housing provided in an embodiment of this application;

[0037] Figure 17 Another schematic diagram of the second housing provided in the embodiments of this application;

[0038] Figure 18 Another schematic diagram of the battery pack provided in the embodiments of this application;

[0039] Figure 19 Another schematic diagram of the battery pack provided in the embodiments of this application;

[0040] Figure 20 An exploded view of another structure of the battery pack provided in an embodiment of this application;

[0041] Figure 21 for Figure 20 Another schematic diagram of the battery pack;

[0042] Figure 22 for Figure 20 A schematic diagram of the battery module.

[0043] Figure label:

[0044] 10-Energy storage system, 11-Rack, 12-Control module, 20-Battery pack, 21-Casing, 22-Battery module, 23-Mounting base, 211-First casing, 212-Second casing, 213-Inspection port, 214-Cover plate, 215-Baffle plate, 216-First flue, 217-Explosion-proof valve, 218-Second flue, 219-Back plate, 220-Heat sink, 221-Battery cell, 222-Restraint strap, 223-Positive terminal, 224-Negative terminal, 225-Flexible circuit board, 22 6-Circuit board support, 227-Positive module busbar, 228-Negative module busbar, 229-Cell busbar, 230-Opening, 231-First inlet, 232-First outlet, 233-Second inlet, 234-Second outlet, 235-First power terminal, 236-Second power terminal, 237-Explosion relief valve, 238-First snap-fit ​​part, 239-Second snap-fit ​​part, 240-First bevel, 241-Second bevel, 242-First OT terminal, 243-Second OT terminal Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. The same reference numerals in different drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted. The terms expressing position and direction described in the embodiments of this application are illustrative based on the accompanying drawings, but changes can be made as needed, and all such changes are included within the scope of protection of this application. The accompanying drawings of the embodiments of this application are only for illustrating relative positional relationships and do not represent actual scale.

[0046] It should be noted that specific details are set forth in the following description to facilitate understanding of this application. However, the embodiments of this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the embodiments of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0047] To facilitate understanding of the battery pack and energy storage system provided in the embodiments of this application, their application scenarios are described below. With the popularization of distributed energy systems, residential energy storage devices, as core components of home energy management, are becoming increasingly important. Residential energy storage battery packs provide a stable and economical power supply to households by storing surplus photovoltaic power generation or charging during off-peak hours, and also possess emergency backup power capabilities. Currently, residential energy storage battery packs are developing towards higher energy density, more compact modular designs, and longer service life.

[0048] Figure 1A schematic diagram of the energy storage system provided in the embodiments of this application, such as... Figure 1 As shown, the energy storage system 10 includes a cabinet 11. The cabinet 11 can accommodate multiple battery packs 20, which are stacked along the height H of the cabinet 11. To facilitate management of the multiple battery packs 20, in some embodiments, the cabinet 11 also houses a control module 12. The control module 12 is connected to the multiple battery packs 20 and is used to manage the charging and discharging of the battery packs 20. The energy storage system 10 is connected to an external photovoltaic system to achieve energy storage and intelligent scheduling.

[0049] The battery pack 20 typically uses a sealed casing to ensure its dustproof and waterproof protection level as well as structural strength. Commonly, the casing can be made of sheet metal or engineering plastics, and its interior integrates key components such as battery modules, BMS, electrical connection cables, fuses, and contactors.

[0050] The reliability of the electrical connections within a battery pack determines its safe and stable operation. Faulty electrical connections can lead to increased contact resistance, potentially causing localized overheating, arcing, or even fire under high-current operating conditions. Troubleshooting typically involves inspecting the internal electrical connections of the battery pack. Inspecting internal wiring often requires disassembling the entire battery pack casing. This process is cumbersome, time-consuming, and labor-intensive, and carries the risk of accidental damage to cables or components. This is especially true in residential energy storage systems, where battery packs are smaller than those used in energy storage containers, demanding greater flexibility in installation and maintenance.

[0051] In view of this, this application provides a battery pack and an energy storage system to allow for maintenance of electrical connections within the battery pack via an inspection port, thereby simplifying the maintenance process.

[0052] Figure 2 This is a schematic diagram of a battery pack provided in an embodiment of this application. Figure 3 Another schematic diagram of the battery pack provided in the embodiments of this application is shown below. Figure 2 and Figure 3 As shown, the battery pack 20 includes a housing 21. For ease of explanation, the height of the battery pack 20 is denoted as H, the same as the height of the cabinet 11; the length of the battery pack 20 is denoted as L; and the width of the battery pack 20 is denoted as W. Two mounting bases 23 are provided on the top of the housing 21, which can be used to install handles. Thus, the battery pack 20 can be lifted using the two handles when assembling or disassembling the energy storage system 10.

[0053] Within the battery pack 20, the interior of the outer casing 21 can accommodate a battery module and an electronic control module. The outer casing 21 can be partitioned to house the battery module and the electronic control module. Specifically, the outer casing 21 includes a first housing 211 and a second housing 212. The first housing 211 is used to house the battery module, and the second housing 212 is used to house the electronic control module. The electronic control module can be used to monitor, control, and protect the operation of the battery module. Figure 4 This is an exploded view of the battery pack provided in an embodiment of this application. Figure 5 A schematic diagram of the first housing provided for an embodiment of this application, as shown below. Figure 4 and Figure 5 As shown, the top of the first housing 211 is provided with an inspection port 213 and a cover plate 214, and the cover plate 214 seals the inspection port 213. After opening the cover plate 214, the inside of the battery pack 20 can be inspected through the inspection port 213.

[0054] Figure 6 for Figure 2 Exploded view of the battery pack. Figure 7 for Figure 3 Exploded view of the battery pack, such as Figure 6 and Figure 7 As shown, the first housing 211 and the second housing 212 are detachably connected, for example, through threaded connections, adhesive bonding, riveting, etc. To ensure the sealing of the connection between the first housing 211 and the second housing 212, a sealing ring can be provided between them to ensure the dustproof and waterproof protection level of the outer casing 21. For example... Figure 5 As shown, the side of the first housing 211 facing the second housing 212 does not need to be provided with a side plate, and the sealing of the first housing 211 is achieved by connecting the first housing 211 and the second housing 212.

[0055] Figure 8 for Figure 6 Further exploded view of the battery pack. Figure 9 This is a schematic diagram of the battery module provided in the embodiments of this application, such as... Figure 8 and Figure 9 As shown, the battery module 22 is located inside the first housing 211 and is electrically connected to the electronic control module. The battery module 22 includes a plurality of battery cells 221, which are arranged along the length direction L of the battery pack 20 and are bound together by restraint straps 222 to prevent excessive expansion of the battery cells 221 from causing damage to the internal structure, loosening of connectors, or deformation of the housing 21.

[0056] Please continue to refer to this. Figure 9The battery module 22 also includes a cell busbar 229. In some embodiments, a plurality of cells 221 are arranged along the length direction L, and the positive and negative terminals of each cell 221 are arranged in the same order along the width direction W. The cell busbar 229 may include a positive cell busbar and a negative cell busbar. In this embodiment, the positive cell busbar can be arranged along the length direction L and connect to the positive terminals of the plurality of cells 221, and the negative cell busbar can be arranged along the length direction L and connect to the negative terminals of the plurality of cells 221.

[0057] In other embodiments, multiple battery cells 221 are arranged along the length direction L, and the positive and negative terminals of adjacent battery cells 221 are arranged in opposite order along the width direction W. That is, in two adjacent battery cells 221, the positive terminal of one battery cell 221 is adjacent to the negative terminal of the other battery cell 221, and the negative terminal of one battery cell 221 is adjacent to the positive terminal of the other battery cell 221. The battery cell module 22 includes multiple battery cell busbars 229, and adjacent terminals of two adjacent battery cells 221 are connected through the battery cell busbars 229.

[0058] In addition, since the terminal protrudes from the top surface of the cell 221, the cell bus 229 has a bent structure corresponding to the terminal, so that the cell bus 229 can cover the top of the cell 22 and the top of the terminal.

[0059] Please continue to refer to this. Figure 9 In some embodiments, the plurality of battery cells 221 include a total positive electrode 223 and a total negative electrode 224. The total positive electrode 223 and the total negative electrode 224 extend along the width direction and the length direction L. The total positive electrode 223 and the total negative electrode 224 can be electrically connected to an electronic control module.

[0060] Figure 10 for Figure 9 Exploded view of the battery module, such as Figure 9 and Figure 10 As shown, the battery module 22 also includes a flexible circuit board 225 and a circuit board support 226. The circuit board support 226 is located on top of the cell busbar 229, and the flexible circuit board 225 is located on top of the circuit board support 226. The circuit board support 226 can separate the flexible circuit board 225 from the cell busbar 229. The flexible circuit board 225 can be used to collect and transmit the status signals of the cell 221 and needs to be electrically connected to the cell 221. To simplify the structure of the battery module 22, the cell busbar 229 is electrically connected to the flexible circuit board 225.

[0061] Figure 11 A top view of the battery pack provided in an embodiment of this application, as shown below. Figure 11As shown, in order to facilitate the inspection and maintenance of the connection points between the battery busbar 229 and the terminals of the multiple battery cells 221, and the connection points between the flexible circuit board 225 and the battery busbar 229, all of the above connection points can face the inspection port 213.

[0062] When the battery pack 20 is operating normally, the cover 214 closes onto the inspection port 213 to seal it, thus forming a sealed outer casing 21. When the battery pack 20 malfunctions, the cover 214 is opened to expose the inspection port 213. Through the inspection port 213, the electrical connection status of the connection points between the cell busbar 229 and the terminals can be directly inspected, and these connection points can be repaired. The operation is simple and does not require disassembling the entire outer casing 21, thus simplifying the maintenance process.

[0063] Furthermore, in order to facilitate the direct disassembly or installation of these connection points through the access port 213, at least part of these connection points are exposed to the access port 213 along the height direction H of the battery pack 20. That is, the projection of the access port 213 along the height direction H covers at least a portion of these connection points.

[0064] In one embodiment, the cover plate 214 is detachably mounted on the top surface of the first housing 211 by means of screws or other connections. In order to ensure the sealing and waterproofing of the housing 21, the periphery of the access port 213 extends away from the battery module 22 and is provided with a protrusion. A sealing ring is also provided between the cover plate 214 and the top surface of the first housing 211. The sealing ring surrounds the outer periphery of the protrusion, thereby improving the sealing performance of the cover plate 214.

[0065] In some embodiments, the area of ​​the access port 213 is smaller than the area of ​​the top of the housing 21 to ensure the structural strength and sealing reliability of the housing 21.

[0066] Furthermore, the shape of the access port 213 is not limited; for example, it can be rectangular, elliptical, circular, or other irregular shapes. This application does not impose any specific restrictions.

[0067] like Figure 10 and Figure 11 As shown, along the height direction H, portions of the battery busbar 229 and the flexible circuit board 225 can face the access port 213. That is, the projection of the access port 213 along the height direction H can overlap with both the battery busbar 229 and the flexible circuit board 225. It is understood that when maintenance personnel perform maintenance, they can view the interior of the first housing 211 from various directions through the access port 213, not just from the viewport. Figure 11 The portion of the circuit board 225 exposed to the access port 213 is inspected. Therefore, the connection points between the flexible circuit board 225 and the multiple battery busbars 229 can all be inspected through the access port 213.

[0068] Figure 12 This is a partial schematic diagram of the battery pack provided in an embodiment of this application, such as... Figure 11 and Figure 12 As shown, a positive electrode module busbar 227 and a negative electrode module busbar 228 are also provided inside the outer casing 21. One end of the positive electrode module busbar 227 is connected to the main positive electrode 223, and the other end of the positive electrode module busbar 227 extends into the second casing 212 and is connected to the electronic control module. One end of the negative electrode module busbar 228 is connected to the main negative electrode 224, and the other end of the negative electrode module busbar 228 extends into the second casing 212 and is connected to the electronic control module.

[0069] In the aforementioned battery pack 20, the cell bus 229 enables electrical connection and grouping of cells 221 within the battery module 22, and carries and distributes module-level current; the positive module bus 227 and the negative module bus 228 enable series and parallel connection and system integration between modules, carry the total current of the battery pack 20, and serve as high-voltage electrical interfaces connected to the disconnection unit of the battery module 22.

[0070] The main positive terminal 223 is electrically connected to the electronic control module via the positive terminal module bus 227, and the main negative terminal 224 is electrically connected to the electronic control module via the negative terminal module bus 228. When the battery pack 20 malfunctions, it may be necessary to disconnect the battery module 22 from the electronic control box. The connection points of the positive terminal module bus 227 and the main positive terminal 223, and the connection points of the negative terminal module bus 228 and the main negative terminal 224, can both face the inspection port 213. Through the inspection port 213, the positive terminal module bus 227 can be disconnected from the main positive terminal 223, and the negative terminal module bus 228 can be disconnected from the main negative terminal 224, thereby disconnecting the battery module 22 from the electronic control module for maintenance of the battery module 22.

[0071] Figure 13 This is a schematic diagram of the second housing provided in an embodiment of this application. Figure 14 for Figure 13 An exploded view of the second shell, as shown below. Figure 13 and Figure 14 As shown, in some embodiments, a partition 215 is provided between the first housing 211 and the second housing 212. The partition 215 is connected to the second housing 212, thereby forming a receiving space between the partition 215 and the housing 212, in which the electronic control module is placed. The partition 215 can isolate the plurality of battery cells 221 and the electronic control module to achieve electrical isolation. The positive electrode module bus 227 and the negative electrode module bus 228 respectively pass through the partition 215.

[0072] Figure 15 for Figure 13 Another exploded view of the second shell, Figure 16 An exploded view of the second housing provided in an embodiment of this application, as shown below. Figure 15 and Figure 16As shown, the second housing 212 is provided with a first flue 216, which is isolated from the electronic control module. The first inlet 231 of the first flue 216 is located on the partition 215 and communicates with the first housing 211, and the first outlet 232 of the first flue 216 is located at the top of the second housing 212.

[0073] The aforementioned first flue 216 can be located along the length direction L on one side of the electronic control module, and the first flue 216 is isolated from the housing space used to house the electronic control module. When the battery cell 221 experiences thermal runaway, the gas discharged from the battery module 22 can enter the first flue 216 through the first inlet 231 on the separator 215, and be discharged from the first outlet 232 along the first flue 216 without affecting the electronic control module, thereby improving the safety of the battery pack 20.

[0074] Please refer to Figure 15 and Figure 16 In some embodiments, the first outlet 232 of the first flue 216 is equipped with an explosion-proof valve 217. When the battery pack 20 is operating normally, the top of the first housing 211 is sealed by the cover plate 214, and the first flue 216 is sealed by the explosion-proof valve 217 to ensure the airtightness of the housing 21. When the battery cell 221 experiences thermal runaway, the high-temperature gas generated by the faulty battery cell 221 enters the first flue 216 and can open the explosion-proof valve 217, thereby releasing the pressure and gas in the battery pack 20.

[0075] like Figure 15 As shown, in some embodiments, the first inlet 231 of the first flue 216 includes a plurality of holes, which are arranged in an array on the partition 215. These holes can isolate larger particles (e.g., positive and negative electrode materials) and prevent these particles from being ejected with the airflow and polluting the external environment.

[0076] Figure 17 Another schematic diagram of the second housing provided in the embodiments of this application, as shown below. Figure 17As shown, in some embodiments, the second housing 212 is further provided with a second flue 218, which is isolated from the electronic control module. Specifically, the second housing 212 is also provided with a back plate 219, which is connected to the second housing 212, and the second flue 218 is formed between the back plate 219 and the back of the second housing 212. The second inlet 233 of the second flue 218 is located at the bottom of the second housing 212, and the second outlet 234 of the second flue 218 is located at the top of the second housing 212. The second flue 218 penetrates the second housing 212 along its height. When the lower battery pack 20 experiences thermal runaway, the gas discharged from the first outlet 232 of the lower battery pack 20 can enter the second flue 218 of the upper battery pack 20 from the second inlet 233 of the upper battery pack and be discharged from the second outlet 234 of the upper battery pack 20. In this way, the high-temperature gas passes through the battery pack 20 above the faulty battery pack 20 in sequence, and can be discharged from the second outlet 234 of the second flue 218 of the uppermost battery pack 20, thus preventing the high-temperature gas from accumulating around the faulty battery pack 20.

[0077] like Figure 16 and Figure 17 As shown, the first flue 216 and the second flue 218 are located on both sides of the second housing 212, so that the first flue 216 and the second flue 218 can be isolated by the second housing 212 itself.

[0078] In addition, the electronic control module generates heat during operation. To dissipate heat in a timely manner, multiple heat sinks 220 are provided on the back side of the second housing 212. The heat sinks 220 extend along the height direction H, and the multiple heat sinks 220 are arranged in parallel along the length direction L.

[0079] Figure 18 This is another schematic diagram of the battery pack provided in an embodiment of this application. Figure 19 Another schematic diagram of the battery pack provided in the embodiments of this application is shown below. Figure 18 and Figure 19 As shown, in some embodiments, the second housing 212 is further provided with a first power terminal 235 and a second power terminal 236. The first power terminal 235 is located at the top of the second housing 212, and the second power terminal 236 is located at the bottom of the second housing 212. The second housing 212 includes a first side and a second side opposite to each other along the length direction of the battery pack 20. The first flue 216 and the second flue 218 are arranged along the length direction and disposed close to the first side. The first power terminal 235 and the second power terminal 236 are disposed close to the second side. In this way, one side of the electrical control box is used for exhaust, and the other side is used for electrical connection, achieving electrical isolation.

[0080] like Figure 10As shown, in some embodiments, the flexible circuit board 225 is provided with multiple openings 230, and each of the multiple battery cells 221 is provided with a pressure relief valve 237. The pressure relief valves 237 of the multiple battery cells 221 face the multiple openings 230 and the inspection port 213. When thermal runaway occurs in the battery cell 221 inside the battery module 22, the pressure relief valve 237 of the battery cell 221 is opened, and a large amount of high-temperature gas or flame enters the outer casing 21. The high-temperature gas or flame enters the first flue 216 through the first inlet 231, and is then discharged to the external environment through the first flue 216, preventing high-temperature gas from accumulating inside the battery pack 20 and causing more serious safety hazards.

[0081] like Figure 18 and Figure 19 As shown, in some embodiments, the first power terminal 235 is provided with a first latching portion 238, and the second power terminal 236 is provided with a second latching portion 239, with the first latching portion 238 and the second latching portion 239 mating. When multiple battery packs 20 are stacked, the second latching portion 239 of the second power terminal 236 of the upper battery pack 20 can be engaged with the first latching portion of the first power terminal 235 of the lower battery pack 20. In this way, two adjacent battery packs 20 can be relatively fixed when stacked. Specifically, the first latching portion 238 can be located on the inner wall of the first power terminal 235, and the second latching portion 239 can be located on the outer wall of the second power terminal 236. Alternatively, the first latching portion 238 can be located on the outer wall of the first power terminal 235, and the second latching portion 239 can be located on the inner wall of the second power terminal 236. In one embodiment, the first latching portion 238 can be a protrusion and the second latching portion 239 can be a groove. When the second latching portion 239 of the upper battery pack 20 is inserted into the first latching portion 238 of the lower battery pack 20, the protrusion can be accommodated in the groove and limited in the groove, thereby fixing the first power terminal 235 and the second power terminal 236 relative to each other.

[0082] like Figure 18 and Figure 19 As shown, in order to guide the second power terminal 236 of the upper battery pack 20 and the first power terminal 235 of the lower battery pack 20 to dock, the top of the housing 21 is also provided with a first inclined surface 240, and the bottom of the housing 21 is also provided with a second inclined surface 241, with the first inclined surface 240 and the second inclined surface 241 being parallel. In this way, when the two battery packs 20 are stacked, the first inclined surface 240 contacts the second inclined surface 241 and moves relative to it.

[0083] In the battery pack 20 of this application, the positive terminal module busbar 227 includes a copper busbar or cable, and the negative terminal module busbar 228 includes a copper busbar or cable. For example... Figure 8As shown, the positive module busbar 227 can be a copper busbar, and the negative module busbar 228 can be a copper busbar. The two ends of the copper busbar of the positive module busbar 227 can be connected to the main positive terminal 223 / electrical control module by bolts, and the two ends of the copper busbar of the negative module busbar 228 can be connected to the main negative terminal 224 / electrical control module by bolts.

[0084] Figure 20 This is an exploded view of another structure of the battery pack provided in an embodiment of this application. Figure 21 for Figure 20 Another schematic diagram of the battery pack, Figure 22 for Figure 20 A schematic diagram of the battery module. (See attached diagram.) Figure 20 , Figure 21 and Figure 22 As shown, the positive electrode module busbar 227 can be a cable, and each end of the cable of the positive electrode module busbar 227 is provided with a first OT terminal 242. The negative electrode module busbar 228 can be a cable, and each end of the cable of the negative electrode module busbar 228 is provided with a second OT terminal 243. The first OT terminal 242 of the positive electrode module busbar 227 near the battery module 22 is connected to the main positive terminal 223 by bolts, and the first OT terminal 242 of the positive electrode module busbar 227 near the electronic control module is connected to the electronic control module by bolts. The second OT terminal 243 of the negative electrode module busbar 228 near the battery module 22 is connected to the main negative terminal 224 by bolts, and the second OT terminal 243 of the negative electrode module busbar 228 near the electronic control module is connected to the electronic control module by bolts.

[0085] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery pack, characterized in that, Includes a housing, and a battery bus and multiple battery cells located within the housing, wherein: The top of the casing is provided with an inspection port and a cover plate, and the cover plate seals the inspection port; the top of each of the multiple battery cells is provided with a positive terminal and a negative terminal; the battery cell busbar connects to the terminals of the multiple battery cells, and the connection point between the battery cell busbar and the terminals of the multiple battery cells faces the inspection port.

2. The battery pack as described in claim 1, characterized in that, The outer casing includes a first casing and a second casing, which are connected side-by-side along the width of the battery pack; the battery cell busbar and the plurality of battery cells are located inside the first casing, and the second casing contains an electronic control module; the inspection port and the cover plate are located on the top of the first casing; The housing also includes a positive electrode module bus and a negative electrode module bus; one end of the positive electrode module bus is connected to the total positive electrode of the plurality of battery cells, and the other end of the positive electrode module bus extends into the second housing and is connected to the electronic control module; one end of the negative electrode module bus is connected to the total negative electrode of the plurality of battery cells, and the other end of the negative electrode module bus extends into the second housing and is connected to the electronic control module; the connection points of the positive electrode module bus and the total positive electrode, and the connection points of the negative electrode module bus and the total negative electrode, both face the inspection port.

3. The battery pack as described in claim 2, characterized in that, A partition is provided between the first housing and the second housing, the partition isolating the plurality of battery cells and the electronic control module; the positive electrode module bus and the negative electrode module bus respectively pass through the partition; The second housing is provided with a first flue, which is isolated from the electronic control module; the inlet of the first flue is located on the partition and communicates with the first housing, and the outlet of the first flue is located at the top of the second housing.

4. The battery pack as described in claim 3, characterized in that, An explosion-proof valve is installed at the outlet of the first flue.

5. The battery pack as described in claim 3 or 4, characterized in that, The inlet of the first flue includes multiple holes, and the array of multiple holes is distributed on the partition plate.

6. The battery pack as described in any one of claims 3-5, characterized in that, The second housing is also provided with a second flue, which is isolated from the electronic control module; the inlet of the second flue is located at the bottom of the second housing, the outlet of the second flue is located at the top of the second housing, and the second flue penetrates the second housing along the height direction.

7. The battery pack as described in claim 6, characterized in that, The second housing is further provided with a first power terminal and a second power terminal, the first power terminal being located at the top of the second housing and the second power terminal being located at the bottom of the second housing; the second housing includes a first side and a second side opposite to each other along the length direction of the battery pack; the first flue and the second flue are arranged along the length direction and disposed close to the first side; the first power terminal and the second power terminal are disposed close to the second side.

8. The battery pack as described in claim 7, characterized in that, The first power terminal is provided with a first snap-fit ​​portion, and the second power terminal is provided with a second snap-fit ​​portion.

9. The battery pack as described in any one of claims 2-8, characterized in that, The positive electrode module busbar includes a copper busbar or a cable; the negative electrode module busbar includes a copper busbar or a cable.

10. The battery pack according to any one of claims 1-9, characterized in that, The housing also contains a flexible circuit board, which is connected to the top of the battery cell busbar and faces the inspection port.

11. The battery pack as claimed in claim 10, characterized in that, The flexible circuit board has multiple openings, and each of the multiple battery cells has a pressure relief valve on its top, with the pressure relief valves of the multiple battery cells facing the multiple openings and the inspection port.

12. The battery pack according to any one of claims 1-11, characterized in that, The area of ​​the access port is smaller than the area of ​​the top of the outer casing.

13. The battery pack as described in any one of claims 1-12, characterized in that, The top of the outer casing is provided with a first inclined surface, and the bottom of the outer casing is provided with a second inclined surface, the first inclined surface being parallel to the second inclined surface.

14. An energy storage system, characterized in that, It includes a cabinet and a plurality of battery packs as described in any one of claims 1-13, wherein the plurality of battery packs are stacked along the height direction of the cabinet.

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