Battery pack and energy storage cabinet

Abstract

A battery pack and a battery cabinet. The battery pack comprises a battery module (02) and an integrated busbar (03). The integrated busbar (03) comprises an insulating support frame (1), connecting bars (2), and a sampling plate (3). The insulating support frame (1) comprises a flue (121) and a plurality of channels (122). A base of the flue (121) faces a column of battery cell explosion-proof valves (0212), and two side walls of the flue (121) are located at two sides of the column of battery cell explosion-proof valves (0212). The base of the flue (121) is provided with openings of the plurality of channels (122); one end of the side wall of each of the plurality of channels (122) is connected to the corresponding opening, and the other end thereof is connected to a battery cell (021). Temperature sensors (32) pass through the channels (122) and are in contact with the battery cells (021), the channels (122) are positioned offset from the battery cell explosion-proof valves (0212), and the side walls of the plurality of channels (122) separate the temperature sensors (32) from the battery cell explosion-proof valves (0212).

Description

Battery pack and energy storage cabinet

[0001] The present disclosure claims priority to the Chinese patent application No. 202411315086.7, filed on September 19, 2024, and entitled "Battery pack and energy storage cabinet", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present disclosure relates to the technical field of energy storage, in particular to a battery pack and a battery cabinet. BACKGROUND

[0003] The battery pack includes a battery module and an integrated busbar. The integrated busbar can also be referred to as a cells contact system (CCS).

[0004] In the related art, the integrated busbar includes a connection busbar and a sampling plate, and the connection busbar and the sampling plate are pressed together by a hot stamping film. The connection busbar connects the cells in the battery module in series or in parallel. The sampling plate is electrically connected with the connection busbar, and is used to collect the temperature of the connection busbar and send the collected temperature to a battery management unit (BMU).

[0005] However, the temperature of the connection busbar obtained by the battery management unit does not accurately represent the temperature of the cells, which is not conducive to the temperature control protection of the cells by the battery management unit, and reduces the safety of the battery pack. In addition, when the cells are in thermal runaway, a large amount of smoke will be sprayed out, and if the smoke spreads randomly, it will corrode the connection busbar and the sampling plate, which will further worsen the thermal runaway phenomenon of the battery pack, which also reduces the safety of the battery pack. SUMMARY

[0006] The present disclosure provides a battery pack and a battery cabinet. The plurality of temperature sensors of the integrated busbar of the battery pack can be in contact with the plurality of cells of the battery module, and directly collect the temperature of the cells. Moreover, a flue for the smoke sprayed out by the cell explosion-proof valve to flow is formed between the integrated busbar and the battery module. The technical solutions of the battery pack and the battery cabinet are described as follows.

[0007] In a first aspect, the present disclosure provides a battery pack. The battery pack comprises a housing, a battery module and an integrated busbar. The battery module and the integrated busbar are located in the interior of the housing. The battery module comprises at least one column of battery cells, each column of battery cells comprising a plurality of battery cells. The integrated busbar comprises an insulating support, a connecting busbar and a sampling board. The insulating support is arranged on the battery module in the opening direction of the explosion-proof valve of the battery cell, and the sampling board and the connecting busbar are arranged on the insulating support. The connecting busbar is used to electrically connect the at least one column of battery cells. The insulating support comprises a flue comprising a groove bottom and two first side walls, the flue is buckled on the column of battery cells, the groove bottom of the flue faces the explosion-proof valve of the column of battery cells, and the two first side walls of the flue are located on both sides of the explosion-proof valve of the column of battery cells. The groove bottom of the flue is provided with openings of a plurality of channels. The side walls of the plurality of channels extend in the opening direction of the explosion-proof valve, one end of the side walls of the plurality of channels communicates with the openings, and the other end of the side walls of the plurality of channels is connected to the battery cells. The temperature sensor electrically connected to the sampling board passes through the channel and contacts the battery cell. The position of the channel is staggered with the explosion-proof valve, and the side walls of the plurality of channels separate the temperature sensor and the explosion-proof valve.

[0008] The battery pack provided by the present disclosure is applied to application scenarios such as data centers, site energy, industrial and commercial energy storage or power station energy storage. The insulating support can be made of high-temperature-resistant plastic material, and the high-temperature resistance of the insulating support is better than that of the hot-pressing film, so that in the early stage of thermal runaway of the battery module, the sampling board will not be melted and damaged under the heat insulation effect of the insulating support. Two connecting busbars are electrically connected to two columns of pole columns of the battery module to realize series connection or parallel connection of a plurality of battery cells. The circuit board of the sampling board is a flexible printed circuit (FPC) or a printed circuit board (PCB). The opening direction of the explosion-proof valve of the battery cell is the direction from low to high of the battery module.

[0009] The technical scheme provided by the present disclosure is characterized in that: the smoke emitted by the explosion-proof valve of the battery cell flows into the flue, and under the blocking effect of the two side walls of the flue, the smoke cannot flow to the two sides of the flue, thereby reducing the risk of short circuit of the battery module and further reducing the possibility of further deterioration of thermal runaway of the battery pack. In addition, one end of the side wall of the plurality of channels is connected to the opening of the groove bottom of the flue, and the other end of the side wall is connected to the battery cell. On the one hand, the temperature sensor can pass through the channel and directly contact the battery cell. In this way, the temperature collected by the temperature sensor is the temperature of the battery cell, so that the temperature obtained by the battery management unit (BMU) is the temperature of the battery cell, which is beneficial to the temperature control protection of the battery cell by the battery management unit and improves the safety of the battery pack. On the other hand, the inside of the channel is separated from the inside of the flue, so that the smoke emitted by the explosion-proof valve of the battery cell cannot enter the channel, and the smoke emitted by the explosion-proof valve of the battery cell cannot be directly emitted to the side of the integrated busbar away from the battery module. In this way, the smoke cannot corrode the sampling plate and the connecting bus, thereby reducing the failure risk of the sampling plate and the short circuit risk of the battery module, and further reducing the possibility of further deterioration of thermal runaway of the battery pack.

[0010] In an implementation manner, the side wall of the plurality of channels, the side wall of the flue and the top wall of the battery cell form a containing cavity, and the temperature sensor is located in the containing cavity. The side wall of the plurality of channels forms an incomplete ring, and the gap of the ring is closed by the side wall of the flue, so that the inside of the channel is separated from the inside of the flue.

[0011] In an implementation manner, the side wall of the plurality of channels and the top wall of the battery cell form a containing cavity, and the temperature sensor is located in the containing cavity. The side wall of the plurality of channels forms a complete ring, and the side wall of the plurality of channels separates the inside of the channel from the inside of the flue.

[0012] In an implementation manner, the temperature sensor is located between the connecting bus and the explosion-proof valve of the battery cell, and the height of the side wall of the channel is higher than the explosion-proof valve of the battery cell and the temperature sensor.

[0013] In an implementation, the insulation support includes a main plate. The main plate includes two busbar fixing portions and a sampling plate fixing portion between the two busbar fixing portions. The two busbar fixing portions are respectively used for fixing the busbars. The sampling plate fixing portion is used for fixing the sampling plate, and the flue and the channel are arranged in the sampling plate fixing portion. The insulation support includes a first side plate connected to one end of the sampling plate fixing portion, the first side plate extends along the height direction of the battery module, and a gap is formed between the first side plate and the side wall of the battery module, and the gap is in communication with the flue. In this way, the flue gas in the flue can flow out through the gap and flow into the inside of the shell. Wherein, the first side plate is arranged in a spaced manner with the bottom wall of the shell, so that the flue gas in the gap can flow out smoothly.

[0014] In an implementation, the battery pack further includes a battery pack explosion-proof valve arranged in the shell wall opposite to the first side plate.

[0015] In this way, when the amount of flue gas discharged by the flue is too large to cause the pressure inside the shell to be too large, the battery pack explosion-proof valve is opened to reduce the possibility of explosion of the battery pack. And since the shell wall where the battery pack explosion-proof valve is located is opposite to the first side plate, when the battery pack explosion-proof valve is opened, the flue gas flowing out from the gap can be discharged from the battery pack explosion-proof valve more quickly, improving the exhaust efficiency of the flue gas.

[0016] In an implementation, the height of the battery pack explosion-proof valve is lower than the height of the bottom end of the first side plate. In this way, it is beneficial for the first side plate to guide the flue gas towards the battery pack explosion-proof valve.

[0017] In an implementation, the groove bottom of the flue includes a plurality of first grooves, and the plurality of first grooves are respectively arranged opposite to a plurality of cell explosion-proof valves of the battery module. Wherein, the groove bottom thickness of the first groove is smaller than the thickness of the groove bottom of the flue. The first groove is used to thin the insulation support to weaken the strength of the part where the first groove is located. In this way, in the late stage of thermal runaway, when the flue gas sprayed by the cell explosion-proof valve is too much and the temperature is too high, the flue gas sprayed by the cell explosion-proof valve can break through the part of the sampling plate fixing portion where the first groove is located. It is beneficial for the flue gas sprayed by the cell explosion-proof valve to quickly spread in the inside of the shell, reducing the possibility of explosion of the battery pack.

[0018] In an implementation, each busbar includes two second grooves. The groove bottoms of the two second grooves each have a positioning through hole, and the two positioning through holes are respectively opposite to two pole columns connected with the busbar. Wherein, the positioning through hole is used to position the relative position relationship between the busbar and the pole column during the welding process of the busbar and the pole column. Each busbar is used for electrically connecting with the pole columns of two cells to connect the two cells in series or parallel.

[0019] The technical scheme provided by the present disclosure has the following beneficial effects. On the one hand, the two second grooves are arranged at positions corresponding to the two pole columns of the connecting row, so that the thickness of the part of the connecting row used for welding with the pole columns is reduced, thereby improving the reliability of the welding of the connecting row with the two pole columns. On the other hand, the thickness of the part of the connecting row between the two second grooves is not reduced, so that the connecting row can still bear a large current.

[0020] In an implementation manner, the side of the connecting row fixing portion facing away from the battery module comprises a plurality of accommodating grooves. The groove bottom of the accommodating groove has two openings, and the two pole columns of the battery module pass through the two openings respectively. Each connecting row is located in one accommodating groove.

[0021] The technical scheme provided by the present disclosure has the following beneficial effects. On the one hand, the accommodating grooves are arranged on the connecting row fixing portion, which facilitates the fixation of the connecting row. On the other hand, the slot opening of the accommodating groove faces the top cover of the shell, so that most of the area of the connecting row faces the top cover and is exposed, which facilitates the heat of the connecting row to be transferred to the top cover and dissipated through the top cover.

[0022] In an implementation manner, the two opposite side walls of each accommodating groove are provided with buckles, and the two opposite side walls of each connecting row are provided with buckles, and the two buckles are located in the two buckles respectively. The connecting manner of the buckles facilitates the buckling of the connecting row and the connecting row fixing portion.

[0023] In an implementation manner, the height of the side wall of the accommodating groove is higher than the height of the connecting row.

[0024] The technical scheme provided by the present disclosure has the following beneficial effects. When a conductive foreign matter (such as a screw) falls on the integrated busbar and is opposite to the two adjacent accommodating grooves, under the action of the side wall between the two adjacent accommodating grooves, one end of the conductive foreign matter sinks and contacts the connecting row on one side of the side wall, and the other end of the conductive foreign matter is raised and cannot contact the connecting row on the other side of the side wall, so that the connecting rows on the two sides of the side wall are not short-circuited. This improves the safety of the battery pack during use and during production.

[0025] In an implementation manner, the insulating support further comprises a second side plate connected to one end of the main plate and arranged opposite to the first side plate. The integrated busbar further comprises a first pole output row and a second pole output row. One end of the first pole output row is fixed to the end of the connecting row fixing portion away from the second side plate and is electrically connected to the pole column of the battery cell away from the second side plate. One end of the second pole output row is fixed to the end of the connecting row fixing portion close to the second side plate and is electrically connected to the pole column of the battery cell close to the second side plate. The other end (i.e. the external connection end) of the first pole output row and the second pole output row is fixed to the second side plate. One of the first pole output row and the second pole output row is a positive pole output row, and the other is a negative pole output row. The arrangement of the second side plate facilitates the fixation of the external connection end of the first pole output row and the second pole output row.

[0026] In an implementation manner, the insulating support further comprises a third side plate. The third side plate is connected to one side of the main body plate and located between the first side plate and the second side plate. The first side plate is provided with a first limiting groove, and the third side plate is provided with a second limiting groove. The first pole output row comprises a first segment, a second segment and a third segment connected in sequence, the first segment extends into the first limiting groove, the second segment extends into the second limiting groove, and the third segment is fixed to the second side plate. The first limiting groove and the second limiting groove are provided, on the one hand, so that the first side plate and the third side plate can separate the first pole output row from the side wall of the battery module, thereby avoiding the first pole output row and the second pole output row from igniting by arc between the battery module. On the other hand, the first side plate and the third side plate also separate the first pole output row from the shell, thereby reducing the risk of electric shock.

[0027] In an implementation manner, the integrated busbar further comprises at least one insulating sleeve. The insulating sleeve surrounds the first pole output row and / or the second pole output row. The material of the insulating sleeve comprises a ceramic composite material.

[0028] The technical solution provided by the present disclosure is that the insulating sleeve separates the first pole output row and the second pole output row from the battery module by surrounding the first pole output row and / or the second pole output row, thereby avoiding the first pole output row and the second pole output row from igniting by arc between the battery module. At the same time, the insulating sleeve also separates the first pole output row and the second pole output row from the shell, thereby avoiding the risk of electric shock.

[0029] In an implementation manner, the integrated busbar further comprises a fuse, and the fuse is connected in series with the first pole output row or the second pole output row. The fuse is fixed to the side of the second side plate away from the battery module. In this way, when the battery module is short-circuited and the current of the first pole output row and the second pole output row is too large, the fuse will be blown, thereby achieving short-circuit protection.

[0030] In an implementation manner, the circuit board comprises a first plate body and a second plate body. The first plate body is fixed to the sampling plate fixing portion, and the second plate body is bent relative to the first plate body, and a part of the second plate body is fixed to the second side plate. The sampling plate further comprises a data output connector, and the data output connector is fixed to one end of the second plate body away from the first plate body. The data output connector is used for interfacing with the battery management unit to output the information collected by the sampling plate to the battery management unit, so that the battery management unit can manage the battery cells in the battery pack based on the received information.

[0031] In an implementation manner, the sampling plate further comprises an OT terminal connector, and the OT terminal connector is fixed to the second plate body and electrically connected to the data output connector. The integrated busbar further comprises at least one OT terminal. The OT terminal is arranged on the first pole output row and / or the second pole output row, and the OT terminal is electrically connected to the OT terminal connector.

[0032] The OT terminal includes an OT temperature acquisition terminal and an OT voltage acquisition terminal. The OT temperature acquisition terminal is configured to acquire the temperature of the first pole output row and / or the second pole output row, and the OT voltage acquisition terminal is configured to acquire the voltage of the first pole output row and / or the second pole output row. The information acquired by the OT terminal can be transmitted to the data output connector via the OT terminal connector, and then transmitted to the battery management unit via the data transmission connector.

[0033] In an implementation, the shell includes a bottom shell, a top cover, and an end cover assembly. The bottom shell or the top cover is provided with a port opposite to the second side plate, and the end cover assembly seals the port. The end cover assembly includes a receiving cavity, and the battery pack further includes a battery management unit, which is located in the receiving cavity of the end cover assembly and electrically connected. Since the battery management unit is arranged in the receiving cavity of the end cover assembly, the battery management unit and the battery module are separated by the end cover assembly, reducing the possibility of spark generated by the battery management unit being transmitted to the battery module.

[0034] In an implementation, the end cover assembly includes a first end plate, a cover plate, and a partition plate. The first end plate is located at the port and is provided with a connector through hole for the data output connector to pass through. The cover plate is fixedly connected with the first end plate, and a receiving cavity is enclosed between the cover plate and the first end plate. The partition plate is located in the receiving cavity and seals a part of the connector through hole. A gap is formed between the partition plate and the hole wall of the connector through hole. The second plate body passes through the gap. The battery management unit is fixed to the side of the partition plate away from the first end plate.

[0035] The technical solution provided by the present disclosure sets the connector through hole on the first end plate, so that the data output connector can extend to the other side of the first end plate through the connector through hole, ensuring the normal docking of the data output connector and the battery management unit. By setting the partition plate to seal a part of the connector through hole, only leaving a gap for the second plate body to pass through, and arranging the battery management unit on the side of the partition plate away from the first end plate, the battery management unit and the battery module are almost completely separated by the first end plate and the partition plate, reducing the possibility of spark generated by the battery management unit being transmitted to the battery module.

[0036] In an implementation, the integrated busbar further includes a first insulating sheet attached to the side of the second side plate facing the battery module.

[0037] The first insulating sheet includes a ceramic composite material, which can be referred to as a first ceramic composite strip. The first insulating sheet can separate the battery module from other electrical components (such as fuses and connectors), preventing sparks generated by other electrical components from being transmitted to the battery module.

[0038] In a second aspect, the present disclosure provides a battery cabinet. The battery cabinet comprises a cabinet body and a plurality of battery packs according to any one of the first aspect. The plurality of battery packs are electrically connected and located in the interior of the cabinet body. The plurality of battery packs are connected in series or in parallel. The battery pack comprises a battery pack explosion-proof valve, and the battery pack explosion-proof valves of the plurality of battery packs are all in communication with a cabinet body flue of the cabinet body. In this way, the flue gas discharged by the battery pack explosion-proof valve is discharged through the cabinet body flue, avoiding the flue gas sprayed after the battery pack explosion-proof valve explodes from polluting the environment. BRIEF DESCRIPTION OF DRAWINGS

[0039] FIG. 1 is a schematic diagram of a battery pack according to an embodiment of the present disclosure;

[0040] FIG. 2 is a schematic diagram of a battery pack according to an embodiment of the present disclosure;

[0041] FIG. 3 is an exploded view of a battery pack according to an embodiment of the present disclosure;

[0042] FIG. 4 is a schematic diagram of a battery module and an integrated busbar according to an embodiment of the present disclosure;

[0043] FIG. 5 is an exploded view of an integrated busbar according to an embodiment of the present disclosure;

[0044] FIG. 6 is a partial enlarged view of the portion enclosed by frame A in FIG. 5;

[0045] FIG. 7 is a schematic diagram of a conductive bar according to an embodiment of the present disclosure;

[0046] FIG. 8 is a schematic diagram of an integrated busbar according to an embodiment of the present disclosure;

[0047] FIG. 9 is a partial enlarged view of the portion enclosed by frame D in FIG. 8;

[0048] FIG. 10 is a schematic diagram of a sampling plate according to an embodiment of the present disclosure;

[0049] FIG. 11 is a partial enlarged view of the portion enclosed by frame E in FIG. 10;

[0050] FIG. 12 is a schematic diagram of the bottom of an integrated busbar according to an embodiment of the present disclosure;

[0051] FIG. 13 is a partial enlarged view of the portion enclosed by frame G in FIG. 12;

[0052] FIG. 14 is a sectional view of an integrated busbar and a battery module according to an embodiment of the present disclosure;

[0053] FIG. 15 is a partial enlarged view of the portion enclosed by frame H in FIG. 14;

[0054] FIG. 16 is a partial sectional view of an integrated busbar according to an embodiment of the present disclosure;

[0055] FIG. 17 is a schematic diagram of a connection row, a first pole output row, a second pole output row, and a fuse according to an embodiment of the present disclosure;

[0056] FIG. 18 is a schematic diagram of a current path of a battery module according to an embodiment of the present disclosure;

[0057] FIG. 19 is a schematic diagram of a second pole output row and an insulating sleeve according to an embodiment of the present disclosure;

[0058] FIG. 20 is a schematic diagram of a first pole output row and an insulating sleeve according to an embodiment of the present disclosure;

[0059] FIG. 21 is a partial enlarged view of a portion enclosed by a box B in FIG. 5;

[0060] FIG. 22 is a partial enlarged view of a portion enclosed by a box C in FIG. 5;

[0061] FIG. 23 is a partial enlarged view of a portion enclosed by a box I in FIG. 17;

[0062] FIG. 24 is a partial enlarged view of a portion enclosed by a box F in FIG. 10;

[0063] FIG. 25 is a schematic diagram of an end cover assembly, a battery management unit, a positive output terminal, and a negative output terminal according to an embodiment of the present disclosure;

[0064] FIG. 26 is a schematic diagram of a first end plate and a partition plate according to an embodiment of the present disclosure;

[0065] FIG. 27 is a front view of an end cover assembly according to an embodiment of the present disclosure;

[0066] FIG. 28 is a schematic diagram of a sampling plate and an end cover assembly according to an embodiment of the present disclosure;

[0067] FIG. 29 is an exploded view of a battery module according to an embodiment of the present disclosure;

[0068] FIG. 30 is an exploded view of a cladding assembly according to an embodiment of the present disclosure;

[0069] FIG. 31 is a schematic diagram of a battery cabinet according to an embodiment of the present disclosure;

[0070] FIG. 32 is a schematic diagram of a battery pack and a connection according to an embodiment of the present disclosure;

[0071] FIG. 33 is a partial enlarged view of a portion enclosed by a box J in FIG. 31.

[0072] Legend 001, battery pack, 002, cabinet, 0021, cabinet flue, 003, connecting piece; 01, shell, 011, bottom shell, 0111, port, 012, top cover, 013, end cover assembly, 0131, first end plate, 01310, gap, 01311, perforation, 0132, cover plate, 0133, partition plate; 02, battery module, 021, battery cell, 0211, pole, 0212, battery cell explosion-proof valve, 0213, slot, 022, cladding assembly, 0220, insulating sheet, 0221, bottom plate, 0222, side plate, 0223, second end plate, 0224, tightening band, 0225, flexible partition plate; 03, integrated busbar; 04, battery pack explosion-proof valve; 05, battery management unit, 051, battery management unit connector; 06, heat-conducting pad; 07, second insulating sheet; 08, positive output terminal; 09, negative output terminal; 1, insulating support, 10, main plate, 11, connecting row fixing part, 111, accommodating groove, 112, opening, 113, buckle, 114, side wall, 115, positioning strip, 116, fourth groove, 12, sampling plate fixing part, 121, flue, 122, channel, 123, first groove, 124, positioning pin, 13, first side plate, 130, gap, 131, first limiting groove, 14, second side plate, 15, third side plate, 151, second limiting groove, 16, fuse cover plate; 2, connecting row, 21, second groove, 22, positioning through hole, 23, bayonet, 24, positioning port; 3, sampling plate, 31, circuit board, 311, first plate body, 3111, opening, 3112, connecting strip, 3113, pin shaft hole, 312, second plate body, 32, temperature sensor, 33, nickel sheet, 34, data output connector, 35, OT terminal connector; 4, first pole output row, 41, positive aluminum sheet, 411, first section, 4111, first pole inner connection end, 412, second section, 413, third section, 42, positive copper sheet; 5, second pole output row, 51, negative aluminum sheet, 511, second pole inner connection end, 52, first negative copper sheet, 53, second negative copper sheet; 6, fuse; 7, insulating sleeve; 8, OT terminal, 81, OT temperature sampling terminal, 82, OT pressure sampling terminal; 9, first insulating sheet. DETAILED DESCRIPTION

[0073] Generally, in order to increase the capacity of the battery pack, a plurality of battery cells connected in series or in parallel are included in the battery pack. In order to detect the working state, the state of charge, the risk of thermal runaway, and the thermal management demand of the battery cell in real time, the temperature of the battery cell needs to be detected in real time. By monitoring the temperature of the battery in real time, potential risks such as overheating or overcooling of the battery can be effectively prevented, thereby improving the service life and safety of the battery. Therefore, the temperature sampling accuracy is crucial for the efficient and safe use of the battery.

[0074] In the related art, a battery pack includes a shell, a battery module and an integrated busbar, which can also be referred to as a cells contact system (CCS). The integrated busbar includes a connection bar and a sampling plate, which are pressed together by a hot stamping film. The connection bar is welded with the pole of a cell in the battery module to realize the series or parallel connection of the cells in the battery module. A temperature sensor (such as a thermistor) is arranged on the connection bar, and the sampling plate is electrically connected with the temperature sensor on the connection bar. The sampling plate can collect the temperature of the connection bar through the temperature sensor and send the temperature of the connection bar as the temperature of the cell to a battery management unit (BMU).

[0075] However, the temperature of the connection bar is not equal to the temperature of the cell, and after the temperature of the cell rises, the heat needs a certain time to conduct to the connection bar, which makes the temperature obtained by the battery management unit inaccurate and not timely. This is not conducive to the temperature control protection of the battery management unit on the cell, and reduces the safety of the battery pack.

[0076] In addition, an anti-explosion valve is arranged on the cell, and when the cell has a thermal runaway phenomenon, the anti-explosion valve will spray out high-temperature and corrosive smoke. The smoke will corrode the connection bar and the sampling plate, which may further worsen the thermal runaway phenomenon of the cell and reduce the safety of the battery pack.

[0077] In view of the above technical problems, the present embodiment provides a new battery pack 001. The battery pack 001 provided by the present embodiment can be applied to application scenarios such as data centers, site energy, industrial and commercial energy storage and power station energy storage. For example, the battery pack 001 is applied to an uninterruptible power supply (UPS) in a data center.

[0078] FIGS. 1 and 2 show the external view of the battery pack 001. FIG. 3 shows the explosion view of the battery pack 001. As shown in FIGS. 1-3, the battery pack 001 includes a shell 01, a battery module 02 and an integrated busbar 03. The battery module 02 and the integrated busbar 03 are located inside the shell 01.

[0079] FIG. 4 shows a schematic diagram of the battery module 02 and the integrated busbar 03. As shown in FIG. 4, the battery module 02 includes at least one column of battery cells 021, and each column of battery cells 021 includes a plurality of battery cells 021. Each battery cell 021 includes two poles 0211 (positive and negative poles), and the poles 0211 of each column of battery cells 021 are arranged in two columns. An explosion-proof valve 0212 is arranged between the two poles 0211 of each battery cell 021. The explosion-proof valve 0212 is used to release pressure when the battery cell 021 is in thermal runaway to prevent the battery cell 021 from exploding. Among them, in order to realize that when the internal pressure of the battery cell 021 is too large, the smoke in the battery cell 021 breaks through the explosion-proof valve 0212, the structural strength of the explosion-proof valve 0212 is relatively low.

[0080] FIG. 5 shows an exploded view of the integrated busbar 03. As shown in FIG. 5 and FIG. 4, the integrated busbar 03 includes an insulating support 1, two groups of connection bars 2, and a sampling plate 3. The insulating support 1 can be made of high-temperature-resistant plastic material, and the high-temperature resistance of the insulating support 1 is better than that of the hot-pressed film in the related art. Therefore, in the early stage of thermal runaway of the battery module 02, the sampling plate 3 on the insulating support 1 will not be melted and damaged under the heat insulation effect of the insulating support 1. The insulating support 1 includes a main plate 10, and the main plate 10 includes two connection bar fixing portions 11 and a sampling plate fixing portion 12 located between the two connection bar fixing portions 11. The two groups of connection bars 2 are fixed to the two connection bar fixing portions 11, respectively, and are connected (such as welded) to the two columns of poles 0211 of the battery module 02, respectively, so as to connect the plurality of battery cells 021 of the battery module 02 in series or parallel.

[0081] FIG. 6 shows a partial enlarged view of the portion framed by frame A in FIG. 5. As shown in FIG. 5 and FIG. 6, the side of the connection bar fixing portion 11 away from the battery module 02 includes a plurality of accommodating grooves 111, and the groove bottom of the accommodating groove 111 is provided with two openings 112 for the two poles 0211 connected by the connection bar 2 to pass through. Each connection bar 2 is limited in one accommodating groove 111.

[0082] The technical scheme provided by the embodiments of the present disclosure sets the accommodating groove 111 on the side of the connection bar fixing portion 11 away from the battery module 02. On the one hand, it is convenient for fixing the connection bar 2. On the other hand, the groove opening of the accommodating groove 111 faces the top cover 012 of the shell 01, and most of the area of the connection bar 2 faces the top cover 012, which is beneficial to the heat conduction of the connection bar 2 to the top cover 012 and the dissipation of the heat through the top cover 012. It should be noted that in the related art, in order to prevent conductive foreign matter, the side of the connection bar 2 facing the top cover 012 is coated, which is not conducive to the heat dissipation of the connection bar 2.

[0083] In some examples, as shown in FIG. 3, the battery pack 001 further comprises a plurality of heat-conducting pads 06. The heat-conducting pads 06 are attached to the connecting bars 2, and the heat-conducting pads 06 are used to conduct heat of the connecting bars 2 to the top cover 012 of the shell 01.

[0084] In some examples, as shown in FIG. 6, the opposite two side walls of the accommodating groove 111 are provided with buckles 113. FIG. 7 shows a schematic view of the connecting bar 2. As shown in FIG. 7, the opposite two side walls of the connecting bar 2 are provided with buckles 23. FIG. 8 shows a schematic view of the integrated busbar 03, and FIG. 9 shows a partial enlarged view of the part framed by the box D in FIG. 8. As shown in FIG. 9, the two buckles 113 are respectively located in the two buckles 23. The buckling connection facilitates the installation of the connecting bar 2.

[0085] In some examples, as shown in FIG. 6, the size of the buckle 113 along the length direction of the connecting bar fixing portion 11 is L1. As shown in FIG. 7, the size of the buckle 23 along the length direction of the connecting bar fixing portion 11 is L2, and L1 is less than L2. In this way, as shown in FIG. 9, there is a gap between the two side walls of the buckle 23 and the buckle 113, and the connecting bar 2 can be offset in the length direction of the connecting bar fixing portion 11, which makes the alignment of the connecting bar 2 and the pole 0211 more accurate during the welding of the connecting bar 2 and the pole 0211.

[0086] In some examples, as shown in FIG. 6, the distance between the head of the buckle 113 and the groove bottom of the accommodating groove 111 is d1. As shown in FIG. 7, the thickness of the connecting bar 2 at the buckle 23 is d2, and d2 is less than d1. As shown in FIG. 9, there is a gap between the bottom of the buckle 23 and the head of the buckle 113. In this way, the connecting bar 2 can be offset in the thickness direction of the connecting bar fixing portion 11. This facilitates the adjustment of the posture of the connecting bar 2 during the welding of the connecting bar 2 and the pole 0211, and improves the reliability of the welding.

[0087] In some examples, as shown in FIG. 6, the accommodating groove 111 is further provided with a positioning strip 115. As shown in FIG. 7, the side wall of the connecting bar 2 is further provided with a positioning port 24, and the positioning strip 115 extends into the positioning port 24.

[0088] In some examples, as shown in FIG. 9, the height of the side wall 114 of the accommodating groove 111 is higher than the height of the connecting bar 2. In this way, when a conductive foreign matter (such as a screw) falls on the integrated busbar 03 and contacts the side wall 114, one end of the conductive foreign matter sinks and contacts the connecting bar 2 on one side of the side wall 114, and the other end of the conductive foreign matter is raised and cannot contact the connecting bar 2 on the other side of the side wall 114, so that the connecting bars 2 on both sides of the side wall 114 are not short-circuited, and the safety of the battery pack 001 during use and during manufacturing is improved.

[0089] The connection bar 2 is used to realize series connection or parallel connection of the battery cells 021. The greater the current carried by the connection bar 2, the greater the thickness of the connection bar 2 needs to be. However, the greater the thickness of the connection bar 2, the more difficult it is to weld the connection bar 2 to the pole 0211 of the battery cell 021, and there may be a case that the laser welding is not penetrable.

[0090] In order to take into account large current and improve the reliability of welding the connection bar 2 to the pole 0211, in some examples, as shown in FIG. 7, the side of the connection bar 2 away from the battery module 02 is provided with two second grooves 21, and the groove bottoms of the two second grooves 21 are provided with positioning through holes 22. The two positioning through holes 22 are used to be opposite to the positions of the two poles 0211 connected by the connection bar 2, so as to facilitate positioning of the connection bar 2 when the connection bar 2 is welded to the pole 0211. The connection bar 2 can be made of aluminum, which can be referred to as an aluminum bar. When assembling the battery pack, a camera can take pictures of the positioning through hole 22 and the pole 0211, and analyze whether the square positioning through hole 22 is coaxial with the circular groove (as shown in FIG. 4) on the pole 0211, so as to position the relative positions of the connection bar 2 and the pole 0211.

[0091] The technical scheme provided by the embodiments of the present disclosure enables two second grooves 21 at positions corresponding to the two poles 0211 of the connection bar 2, so that the thickness of the part of the connection bar 2 welded to the pole 0211 is relatively thin, which is conducive to improving the reliability of welding the connection bar 2 to the two poles 0211. On the other hand, the thickness of the part between the two second grooves 21 on the connection bar 2 is not reduced, so the connection bar 2 can still carry large current. The arrow in FIG. 6 shows the direction of current flow.

[0092] As shown in FIG. 6, the sampling plate fixing part 12 includes a plurality of channels 122, and the plurality of channels 122 penetrate the sampling plate fixing part 12 along the thickness direction. Moreover, the positions of the channels 122 are staggered with the positions of the battery cell explosion-proof valves 0212 of the battery module 02.

[0093] FIG. 10 shows a schematic view of the sampling plate 3. FIG. 11 shows a partial enlarged view of the part boxed in FIG. 10. As shown in FIG. 10 and FIG. 11, the sampling plate 3 includes a circuit board 31 and a plurality of temperature sensors 32. As shown in FIG. 8 and FIG. 9, the circuit board 31 is fixed to the side of the sampling plate fixing part 12 away from the battery module 02. The plurality of temperature sensors 32 are respectively located in the plurality of channels 122 and are in contact with the plurality of battery cells 021 in the battery module 02. The circuit board 31 of the sampling plate 3 is a flexible printed circuit (FPC) or a printed circuit board (PCB). The temperature sensor can be a thermistor.

[0094] The technical scheme provided by the embodiment of the present disclosure is characterized in that the sampling plate fixing portion 12 of the insulating support 1 is provided with a plurality of channels 122, so that the plurality of temperature sensors 32 can pass through the plurality of channels 122 respectively and contact the plurality of battery cells 021 of the battery module 02. In this way, the temperature collected by the temperature sensor 32 is the temperature of the battery cell 021, and the temperature sampling accuracy of the sampling plate 3 is high. This makes the temperature obtained by the battery management unit 05 more accurate and timely, which is beneficial to the temperature control protection of the battery management unit on the battery cell 021, and improves the safety of the battery pack 001.

[0095] In addition, the structural strength at the battery cell explosion-proof valve 0212 of the battery cell 021 is low. Therefore, by setting the position of the channel 122 to be staggered with the battery cell explosion-proof valve 0212 of the battery cell 021, the temperature sensor 32 will not contact the battery cell explosion-proof valve 0212, thereby avoiding damaging the battery cell explosion-proof valve 0212 during the connection of the temperature sensor 32 and the battery cell 021.

[0096] In some examples, as shown in FIG. 4, the portion of the battery cell 021 opposite to the channel 122 is provided with a slot 0213 for exposing the metal material of the battery cell 021. The temperature sensor 32 contacts the bottom of the slot 0213. In this way, the temperature sensor 32 directly contacts the metal material of the battery cell 021, further improving the temperature sampling accuracy and timeliness of the temperature sensor 32. It can be understood that, since the structural strength at the battery cell explosion-proof valve 0212 is low, the slot 0213 cannot be provided at the battery cell explosion-proof valve 0212. Or, it is difficult to provide the slot 0213 without damaging the battery cell explosion-proof valve 0212.

[0097] In some examples, the bottom of the slot 0213 is marked with an information code (such as a two-dimensional code), and the information code is used to identify the battery cell 021. In related technologies, in order to mark the information code on the battery cell 021, a slot 0213 generally needs to be provided on the battery cell 021, and the information code is marked on the metal material at the bottom of the slot 0213 of the battery cell 021. That is, the technical scheme provided by the embodiment of the present disclosure reuses the slot 0213 where the information code is located, so that no new slot 0213 needs to be added on the battery cell 021, reducing the processing difficulty of the battery cell 021 and reducing the cost.

[0098] The embodiments of the present disclosure do not limit the implementation manner of the electrical connection between the circuit board 31 and the temperature sensor 32. In some examples, as shown in FIGS. 10 and 11, the circuit board 31 includes a plurality of openings 3111. As shown in FIG. 9, in the direction perpendicular to the sampling plate fixing portion 12, the plurality of openings 3111 are respectively adjacent to or communicated with the plurality of channels 122, and one side wall of each opening 3111 extends a connecting strip 3112. Each connecting strip 3112 extends into a corresponding channel 122 and is connected with a temperature sensor 32. The connecting strip 3112 is integrally formed with the circuit board 31. In other examples, the circuit board 31 and the temperature sensor 32 are electrically connected through an electrical connection line.

[0099] The embodiments of the present disclosure do not limit the arrangement manner of the channel 122, the opening 3111, the temperature sensor 32 and the slot 0213, as long as the arrangement manner of the channel 122, the opening 3111, the temperature sensor 32 and the slot 0213 is the same.

[0100] In some examples, as shown in FIGS. 5 and 6, the plurality of channels 122 of the sampling plate fixing portion 12 are arranged along the length direction of the sampling plate fixing portion 12, and adjacent two channels 122 are respectively close to different connection row fixing portions 11.

[0101] In order to facilitate batch processing of the slot 0213, the slots 0213 are all at the same position of the battery cell 021, for example, the slots 0213 of the battery cell 021 are all close to the negative pole. Assuming that the plurality of battery cells 021 are in series, the poles 0211 of adjacent two battery cells 021 are opposite in polarity, which makes the slots 0213 of adjacent two battery cells 021 close to the poles 0211 of different columns, and further makes adjacent two channels 122 close to different connection row fixing portions 11. Of course, assuming that the plurality of battery cells 021 are not in series, the arrangement manner of the channel 122 will be adaptively changed following the arrangement manner of the slot 0213.

[0102] In some examples, as shown in FIGS. 9-11, the sampling plate 3 further includes a plurality of nickel sheets 33, one end of the nickel sheet 33 is electrically connected with the circuit board 31, and the other end is electrically connected with the connection row 2 in the connection row 2. The sampling plate 3 is used to collect the voltage of the battery cell 021 through the nickel sheet 33.

[0103] As mentioned above, after the cell rupture valve 0212 of the battery cell 021 opens, the smoke (possibly mixed with liquid) sprayed by the cell rupture valve 0212 is high in temperature and corrosive. If the smoke is allowed to spread freely, the smoke may corrode the pole 0211, the connection busbar 2 and the sampling plate 3, causing the battery module 02 to short circuit and the sampling plate 3 to fail, which may further exacerbate the thermal runaway of the battery pack 001. Moreover, since the passage 122 is provided in the sampling plate fixing portion 12 and extends through the thickness direction, the smoke should also be prevented from flowing into the side of the integrated busbar 03 away from the battery module 02 through the passage 122.

[0104] FIG. 12 shows a schematic view of the side of the integrated busbar 03 facing the battery module 02, and FIG. 13 shows a partial enlarged view of the portion framed by box G in FIG. 12. In order to make the smoke sprayed by the cell rupture valve 0212 controllable, in some examples, as shown in FIG. 12 and FIG. 13, the side of the sampling plate fixing portion 12 facing the battery module 02 includes a flue 121, which includes a groove bottom and two side walls. The flue 121 is the portion framed by the dashed line in FIG. 12 and FIG. 13. FIG. 14 shows a cross-sectional view of the battery pack. FIG. 15 shows a partial enlarged view of the portion framed by box H in FIG. 14. FIG. 16 shows a schematic view of the inside of the flue 121 after the sampling plate fixing portion 12 is partially opened on the side away from the battery module 02. As can be seen from FIG. 14-FIG. 16, the flue 121 is buckled on a row of battery cells 021, and the groove bottom of the flue 121 faces the cell rupture valve 0212 of the row of battery cells 021. The two side walls of the flue 121 are located on both sides of the cell rupture valve 0212 of the row of battery cells 021. In addition, the side walls of the flue 121 are located between the two connection busbar fixing portions 11, so the side walls of the flue 121 separate the flue 121 from the two connection busbar fixing portions 11, and further separate the flue 121 from the connection busbar 2 and the pole 0211.

[0105] As shown in FIG. 13 and FIG. 16, the groove bottom of the flue 121 is provided with openings of a plurality of passages 122. The side walls of the plurality of passages 122 extend in the opening direction of the cell rupture valve 0212, one end of the side walls of the plurality of passages 122 is connected with the openings, and the other end abuts against the battery cell 021. The temperature sensor 32 passes through the passage 122 to contact the battery cell 021, and the position of the passage 122 is staggered with the cell rupture valve 0212. The side walls of the plurality of passages 122 separate the temperature sensor 32 and the cell rupture valve 0212.

[0106] The technical scheme provided by the embodiments of the present disclosure is that the smoke sprayed by the explosion-proof valve 0212 of the battery cell 021 flows along the flue 121, and under the blocking effect of the two side walls of the flue 121, the smoke flowing into the flue 121 will not spread to the two sides of the flue 121, and thus will not corrode the pole 0211 and the connecting busbar 2 on the two sides of the flue 121, thereby reducing the risk of short circuit and the possibility of further deterioration of thermal runaway of the battery pack 001. In addition, since one end of the side wall of the channel 122 is connected with the opening and the other end abuts against the battery cell 021, the inside of the channel 122 is separated from the flue 121, so that the smoke in the flue 121 will not be directly sprayed to the side of the integrated busbar 03 away from the battery module 02 through the channel 122, and thus the smoke will not corrode the sampling plate 3 and the connecting busbar 2, thereby reducing the risk of failure of the sampling plate 3 and the possibility of further deterioration of thermal runaway of the battery pack 001.

[0107] In some examples, as shown in FIGS. 13 and 16, the side wall of the channel 122, the side wall of the flue 121 and the top wall of the battery cell 021 form a containing cavity, and the temperature sensor 32 is located in the containing cavity. For example, the channel 122 includes three side walls, and the three side walls form an incomplete ring, and the gap of the ring is closed by the side wall of the flue 121 to achieve the separation of the inside of the channel 122 and the inside of the flue 121.

[0108] In some examples, as shown in FIGS. 13 and 16, the side wall of the channel 122, the side wall of the flue 121 and the top wall of the battery cell 021 form a containing cavity, and the temperature sensor 32 is located in the containing cavity. For example, the channel 122 includes three side walls, and the three side walls form an incomplete ring, and the gap of the ring is closed by the side wall of the flue 121 to achieve the separation of the inside of the channel 122 and the inside of the flue 121.

[0109] In some examples, as shown in FIG. 16, the temperature sensor 32 is located between the connecting busbar 2 and the explosion-proof valve 0212 of the battery cell 021, and the height of the side wall of the channel 122 is higher than the explosion-proof valve 0212 of the battery cell 021 and the temperature sensor 32.

[0110] In some examples, as shown in FIG. 2, the battery pack 001 further comprises a battery pack explosion-proof valve 04, and the battery pack explosion-proof valve 04 is arranged on the shell wall of the shell 01. In this way, when the amount of smoke sprayed by the explosion-proof valve 0212 of the battery cell 021 is large, the battery pack explosion-proof valve 04 will release pressure when the pressure in the inside of the shell 01 is too large, thereby avoiding explosion of the battery pack 001. The shell 01 is a sealed shell.

[0111] In some examples, as shown in FIGS. 14 and 15, the insulation support 1 further comprises a first side plate 13 connected to one end of the main plate 10 of the insulation support 1. The first side plate 13 extends along the height direction of the battery module 02, and a gap 130 is formed between the first side plate 13 and the battery module 02. The gap 130 is in communication with the flue 121. In this way, the flue gas in the flue 121 can flow out of the gap 130 and into the interior of the shell 01. In examples, the first side plate 13 is perpendicular to the main plate 10, and the first side plate 13 is arranged in a spaced-apart manner with the bottom wall of the shell 01. Of course, in other examples, the insulation support 1 can not include the first side plate 13, and one end of the flue 121 is open. In this way, the flue gas can directly flow out through the opening.

[0112] In some examples, the battery pack explosion-proof valve 04 is located on the shell wall of the shell 01 opposite to the first side plate 13. Then the flue gas in the flue 121 flows towards the battery pack explosion-proof valve 04. In this way, after the battery pack explosion-proof valve 04 is opened, the flue gas can flow out more quickly through the battery pack explosion-proof valve 04, improving the flue gas exhaust efficiency.

[0113] In some examples, the height of the battery pack explosion-proof valve 04 is lower than the height of the bottom end of the first side plate 13. In this way, the first side plate 13 can guide the flue gas towards the battery pack explosion-proof valve 04.

[0114] In some examples, as shown in FIGS. 12 and 13, the sampling plate fixing portion 12 comprises a plurality of first grooves 123 on the side facing the battery module 02. The plurality of first grooves 123 are respectively opposite to the plurality of cell explosion-proof valves 0212 of the battery module 02. Among them, the first groove 123 is used to weaken the strength of the part where it is located, so that in the case that the cell explosion-proof valve 0212 sprays too much flue gas and the temperature is too high in the later stage of thermal runaway, the flue gas sprayed by the cell explosion-proof valve 0212 can break through the first groove 123. In this way, it is beneficial to the flue gas sprayed by the cell explosion-proof valve 0212 to quickly spread in the interior of the shell 01, reducing the possibility of explosion of the battery pack 001.

[0115] It should be noted that in the early stage of thermal runaway, the flue gas sprayed by the cell explosion-proof valve 0212 is less and the temperature is lower, and the flue gas sprayed by the cell explosion-proof valve 0212 will not break through the first groove 123, so the flue gas sprayed by the cell explosion-proof valve 0212 still flows along the flue 121. That is, the first groove 123 is designed for the case that the thermal runaway of the cell 021 is extremely serious.

[0116] In some examples, as shown in FIGS. 12 and 13, the first groove 123 is an annular groove. Of course, in other examples, the first groove 123 can also be a rectangular groove, a circular groove, an elliptical groove, etc.

[0117] In addition, as shown in FIGS. 12 and 13, the connecting strip fixing portion 11 is provided with a plurality of fourth grooves 116 on the side facing the battery module 02, and the fourth grooves 116 are in communication with the openings 112. The fourth grooves 116 are used for the pole posts 0211 of the battery cells 021 to extend into, so as to preliminarily limit the pole posts 0211.

[0118] FIG. 17 shows a schematic diagram of the connecting strip 2, the first pole output strip 4, the second pole output strip 5, and the fuse 6. FIG. 18 shows a schematic diagram of the electrical connection relationship of a plurality of battery cells 021. As shown in FIG. 18, under the electrical connection of the connecting strip 2, the plurality of battery cells 021 are sequentially connected in series.

[0119] In addition, in order to facilitate the battery pack 001 to output electrical energy, in addition to the connecting strip 2, as shown in FIG. 17, the integrated busbar 03 further includes a first pole output strip 4 and a second pole output strip 5. One end of the first pole output strip 4 and the second pole output strip 5 is fixed on the connecting strip fixing portion 11, and is respectively used for welding with a pole post 0211. Under the action of the connecting strip 2, the first pole output strip 4 and the second pole output strip 5, the current path of the battery module 02 is as shown in FIG. 17. One of the first pole output strip 4 and the second pole output strip 5 is a positive pole output strip, and the other is a negative pole output strip.

[0120] FIG. 19 shows a schematic diagram of the second pole output strip 5. In some examples, as shown in FIG. 19, the second pole inner connecting end 511 of the second pole output strip 5 also includes a second groove 21, and the groove bottom of the second groove 21 is also provided with a positioning through hole 22. The positioning through hole 22 is used for being opposite to the position of the pole post 0211 connected with the second pole inner connecting end 511, so as to facilitate the welding of the second pole inner connecting end 511 and the pole post 0211. It should be noted that the second groove 21 of the second pole inner connecting end 511 and the positioning through hole 22 have the same function as the second groove 21 and the positioning through hole 22 on the connecting strip 2. The difference is that the connecting strip 2 is provided with two second grooves 21 and two positioning through holes 22, while the second pole inner connecting end 511 only needs to be welded with one pole post 0211, so only one second groove 21 and one positioning through hole 22 are provided.

[0121] FIG. 20 shows a schematic diagram of the first pole output row 4. In some examples, as shown in FIG. 20, the first pole inner terminal 4111 of the first pole output row 4 also includes a second groove 21, and the groove bottom of the second groove 21 is also provided with a positioning through hole 22. The positioning through hole 22 is used to be opposite to the position of the pole column 0211 to which the first pole inner terminal 4111 is connected, so as to facilitate the welding of the first pole inner terminal 4111 and the pole column 0211. It should be noted that the functions of the second groove 21 and the positioning through hole 22 of the first pole inner terminal 4111 are the same as those of the second groove 21 and the positioning through hole 22 on the connection row 2. The only difference is that the connection row 2 is provided with two second grooves 21 and two positioning through holes 22, while the first pole inner terminal 4111 only needs to be welded with one pole column 0211, so only one second groove 21 and one positioning through hole 22 are provided.

[0122] In some examples, as shown in FIG. 19, the two side walls opposite to the second pole inner terminal 511 of the second pole output row 5 also include two clamping holes 23. The part of the connection row fixing part 11 corresponding to the second pole inner terminal 511 is also provided with a receiving groove 111, and two buckles 113 are arranged in the receiving groove 111, which are respectively clamped with the two clamping holes 23 of the second pole inner terminal 511.

[0123] In some examples, as shown in FIG. 20, the two side walls opposite to the first pole inner terminal 4111 of the first pole output row 4 also include two clamping holes 23. The part of the connection row fixing part 11 corresponding to the first pole inner terminal 4111 is also provided with a receiving groove 111, and two buckles 113 are arranged in the receiving groove 111, which are respectively clamped with the two clamping holes 23 of the first pole inner terminal 4111.

[0124] In some examples, as shown in FIG. 5, the insulating support 1 further includes a second side plate 14 connected to one end of the main body plate 10. The second side plate 14 is bent towards the battery module 02 relative to the main body plate 10. Among them, the second side plate 14 is perpendicular to the main body plate 10, and is arranged opposite to the first side plate 13.

[0125] In some examples, as shown in FIG. 5, the outer terminals of the first pole output row 4 and the second pole output row 5 are fixed to the second side plate 14.

[0126] In some examples, as shown in FIG. 5, one end of the second pole output row 5 is fixed to one end of the connection row fixing part 11 close to the second side plate 14, and is electrically connected to one pole column 0211 of the battery cell 021 close to the second side plate 14. One end of the first pole output row 4 is fixed to one end of the connection row fixing part 11 away from the second side plate 14, and is electrically connected to one pole column 0211 of the battery cell 021 away from the second side plate 14.

[0127] As shown in FIG. 20, the first pole output row 4 includes a first segment 411, a second segment 412 and a third segment 413 connected in sequence. As shown in FIG. 5, the insulating support 1 further includes a third side plate 15 connected to one side of the main body plate 10 and located between the first side plate 13 and the second side plate 14. The first segment 411 is fixedly connected to the first side plate 13, the second segment 412 is fixedly connected to the third side plate 15, and the third segment 413 is fixedly connected to the second side plate 14. In some examples, the third side plate 15 is perpendicular to the main body plate 10.

[0128] FIG. 21 shows a partial enlarged view of the portion framed by block B in FIG. 5, and FIG. 22 shows a partial enlarged view of the portion framed by block C in FIG. 5. In some examples, as shown in FIGS. 5, 21 and 22, the first side plate 13 is provided with a first limiting slot 131, and the third side plate 15 is provided with a second limiting slot 151. The first segment 411 extends into the first limiting slot 131, and the second segment 412 extends into the second limiting slot 151. In this way, the first side plate 13 and the third side plate 15 can not only separate the first pole output row 4 from the side wall of the battery module 02, but also separate the first pole output row 4 from the shell 01.

[0129] In some examples, as shown in FIGS. 19 and 20, the integrated busbar 03 further includes an insulating sleeve 7 surrounding the first pole output row 4 and / or the second pole output row 5. In this way, the insulating sleeve 7 separates the first pole output row 4 and the second pole output row 5 from the battery module 02, avoiding the occurrence of arc ignition between the first pole output row 4 and the second pole output row 5 and the battery module 02. At the same time, the insulating sleeve 7 also separates the first pole output row 4 and the second pole output row 5 from the shell 01, avoiding the occurrence of electric shock. In some examples, the material of the insulating sleeve 7 includes a ceramic composite material.

[0130] The implementation of the first pole output row 4 and the second pole output row 5 is described below.

[0131] In some examples, the second pole output row 5 is a negative pole output row, and as shown in FIG. 19, the second pole output row 5 includes a negative pole aluminum sheet 51 and a first negative pole copper sheet 52 connected in series. In some examples, the insulating sleeve 7 surrounds the negative pole aluminum sheet 51.

[0132] In some examples, as shown in FIG. 20, the first pole output row 4 includes a positive pole aluminum sheet 41 and a positive pole copper sheet 42 connected in series. In some examples, the positive pole aluminum sheet 41 includes the first segment 411, the second segment 412 and the third segment 413. The positive pole copper sheet 42 is fixed to the third segment 413. The insulating sleeve 7 surrounds the positive pole aluminum sheet 41, for example, the first segment 411 and the second segment 412 of the positive pole aluminum sheet 41.

[0133] FIG. 23 shows a partial enlarged view of the part framed by I in FIG. 17. As shown in FIG. 17 and FIG. 23, the integrated busbar 03 further comprises a fuse 6 in series with the first pole output bus 4 or the second pole output bus 5. In this way, when the battery module 02 is short-circuited so that the current of the first pole output bus 4 and the second pole output bus 5 is too large, the fuse 6 will melt to achieve short-circuit protection.

[0134] In some examples, as shown in FIG. 5, the fuse 6 is fixed to the side of the battery module 02 away from the second side plate 14.

[0135] In some examples, as shown in FIG. 16 and FIG. 23, the second pole output bus 5 further comprises a second negative copper sheet 53, and the two ends of the fuse 6 are electrically connected to the first negative copper sheet 52 and the second negative copper sheet 53 respectively.

[0136] In some examples, as shown in FIG. 5, the integrated busbar 03 further comprises a fuse cover plate 16, which is buckled on the second side plate 14 and covers the fuse 6.

[0137] In some examples, as shown in FIG. 10, the circuit board 31 comprises a first plate body 311 and a second plate body 312. As shown in FIG. 5, the first plate body 311 is fixed to the sampling plate fixing part 12, and a part of the second plate body 312 is fixed to the second side plate 14, and the second plate body 312 is provided with a data output connector 34. The data output connector 34 is used to output the temperature collected by the temperature sensor 32 and the voltage collected by the nickel sheet 33. As shown in FIG. 9, the sampling plate fixing part 12 is provided with a positioning pin 124 on the side away from the battery module 02. As shown in FIG. 11, the first plate body 311 is provided with a pin shaft hole 3113, and the positioning pin 124 passes through the pin shaft hole 3113 to realize the positioning of the first plate body 311.

[0138] FIG. 24 shows a partial enlarged view of the part framed by the dashed line F in FIG. 10. In some examples, as shown in FIG. 24, the sampling plate 3 further comprises an OT terminal connector 35, which is electrically connected to the data output connector 34. As shown in FIG. 23, the integrated busbar 03 further comprises an OT terminal 8 (or a circular cold-pressed terminal), which is arranged on the first pole output bus 4 and / or the second pole output bus 5, and the OT terminal 8 is electrically connected to the OT terminal connector 35. The OT terminal 8 comprises an OT temperature sampling terminal 81 and an OT voltage sampling terminal 82. The OT temperature sampling terminal 81 is used to collect the temperature of the first pole output bus 4 and / or the second pole output bus 5, and a temperature sensor (such as a thermistor) is arranged inside the tube column structure of the OT temperature sampling terminal 81. The OT voltage sampling terminal 82 is used to collect the voltage of the first pole output bus 4 and / or the second pole output bus 5.

[0139] In some examples, as shown in FIG. 23, the OT terminal 8 includes three OT temperature sampling terminals 81 and one OT pressure sampling terminal 82. The three OT temperature sampling terminals 81 are fixed to the positive copper sheet 42, the first negative copper sheet 52 and the second negative copper sheet 53 respectively. The OT pressure sampling terminal 82 is fixed to the second negative copper sheet 53. Of course, the OT pressure sampling terminal 82 can also be fixed to the positive copper sheet 42 or the first negative copper sheet 52.

[0140] In some examples, in order to facilitate the fixation of the OT terminal connector 35, a reinforcing plate is arranged between the second plate body 312 and the second side plate 14. The reinforcing plate can be a PCB plate to improve the stability of the fixation of the OT terminal connector 35.

[0141] In some examples, as shown in FIG. 5, the integrated busbar 03 further includes a first insulating sheet 9 attached to the side of the second side plate 14 facing the battery module 02. In this way, the first insulating sheet 9 separates the battery module 02 from each connector, the battery management unit 05, the fuse 6, the output end of the second pole output busbar 5 and the output end of the first pole output busbar 4, avoiding the transmission of arc sparks to the battery module 02 and causing short circuit of the battery module 02. The material of the first insulating sheet 9 can include ceramic composite material, and the first insulating sheet 9 can also be referred to as a first ceramic composite strip.

[0142] Next, the implementation of the shell 01 is exemplarily described.

[0143] In some examples, as shown in FIG. 3, the shell 01 includes a bottom shell 011, a top cover 012 and an end cover assembly 013. The part of the bottom shell 011 or the top cover 012 opposite to the second side plate 14 is provided with a port 0111, and the end cover assembly 013 seals the port 0111. The end cover assembly 013 includes a receiving cavity. The battery pack 001 further includes a battery management unit 05, and the data output connector 34 of the sampling plate 3 and the battery management unit 05 are located in the receiving cavity and electrically connected. Thus, the data output connector 34 can send the collected data to the battery management unit 05.

[0144] Figure 25 shows an exploded view of the end cover assembly 013. As shown in Figure 25, the end cover assembly 013 includes a first end plate 0131, a cover plate 0132, and a partition plate 0133. The first end plate 0131 is located at the port 0111, and the first end plate 0131 is provided with a connector through hole 01311 that is in communication with the port 0111 and is used for the data output connector 34 to pass through. The cover plate 0132 is fixedly connected with the first end plate 0131, and a containing cavity is enclosed between the cover plate 0132 and the first end plate 0131. Figures 26 and 27 show schematic diagrams of the relative positions of the partition plate 0133 and the first end plate 0131. As shown in Figures 26 and 27, the partition plate 0133 is located in the containing cavity. The partition plate 0133 encloses a portion of the connector through hole 01311, and a gap 01310 is formed between the partition plate 0133 and the hole wall of the connector through hole 01311. As shown in Figure 28, the plate body of the sampling plate 3 passes through the gap 01310. The battery management unit 05 is fixed to the side of the partition plate 0133 that faces away from the first end plate 0131.

[0145] The size of the connector through hole 01311 is greater than the size of the data output connector 34, so that the data output connector 34 can pass through the connector through hole 01311 and be electrically connected with the battery management unit 05. After the data output connector 34 passes through the connector through hole 01311, the partition plate 0133 is used to enclose most of the connector through hole 01311, and only the gap 01310 for the second plate body 312 to pass through is left.

[0146] The technical solutions provided by the embodiments of the present disclosure are that the first end plate 0131 and the partition plate 0133 are arranged between the battery management unit 05 and the battery module 02, so that the first end plate 0131 and the partition plate 0133 separate the battery management unit 05 and the battery module 02, avoiding the transmission of sparks from the battery management unit 05 to the battery module 02 and causing damage to the battery module 02. In addition, by arranging the partition plate 0133 to enclose most of the connector through hole 01311 on the first end plate 0131 and only leaving the gap 01310 for the second plate body 312 to pass through, the isolation effect of the partition plate 0133 and the first end plate 0131 is improved.

[0147] Figure 30 shows an exploded view of the cladding assembly 022 of the battery module 02. As shown in Figure 30, the battery module 02 further includes a cladding assembly 022, and the cladding assembly 022 includes a bottom plate 0221, two side plates 0222, and two second end plates 0223. The bottom plate 0221, the two side plates 0222, and the two second end plates 0223 enclose a containing cavity, and a plurality of battery cells 021 are located in the containing cavity. One or more of the bottom plate 0221, the two second end plates 0223, and the two side plates 0222 include an insulating sheet 0220. The material of the insulating sheet 0220 can include a ceramic composite material, and the insulating sheet 0220 can also be referred to as a ceramic composite strip.

[0148] In some examples, as shown in FIGS. 29 and 30, the cladding assembly 022 further comprises a tightening band 0224, which tightens the bottom plate 0221, the two second end plates 0223, and the two side plates 0222 on the plurality of battery cells 021. In examples, as shown in FIGS. 29 and 30, there are two tightening bands 0224, which are arranged along the height direction of the battery module 02.

[0149] In some examples, as shown in FIG. 30, the battery module 02 further comprises a plurality of flexible separators 0225, each of which is arranged between two adjacent battery cells 021.

[0150] In some examples, as shown in FIG. 3, the battery pack 001 further comprises a second insulating sheet 07, which covers the side of the battery module 02 away from the integrated busbar 03. In this way, the second insulating sheet 07 separates the integrated busbar 03 from the upper cover 012 of the shell 01, reducing the risk of electric shock for users. The material of the second insulating sheet 07 can include a ceramic composite material, and the second insulating sheet 07 can also be referred to as a second ceramic composite strip.

[0151] Next, the assembly steps of the integrated busbar 03 are described by way of example.

[0152] First, the first insulating sheet 9 is attached to the side of the second side plate 14 of the insulating support 1 facing the battery module 02.

[0153] Second, the positive copper sheet 42 is assembled on the positive aluminum sheet 41 by means of a screw. The insulating sleeve 7 is wrapped around the positive aluminum sheet 41. The assembled first pole output busbar 4 is inserted into the first limiting groove 131 of the first side plate 13 and the second limiting groove 151 of the third side plate 15 of the insulating support 1.

[0154] Third, each connection busbar 2 is respectively inserted into the plurality of accommodating grooves 111 of the two connection busbar fixing portions 11.

[0155] Fourth, the first negative copper sheet 52 is assembled on the side of the second side plate 14 of the insulating support 1 away from the battery module 02. The insulating sleeve 7 is wrapped around the negative aluminum sheet 51, and the negative aluminum sheet 51 and the first negative copper sheet 52 are assembled together. Then, the negative aluminum sheet 51 is assembled on the insulating support 1.

[0156] Fifth, the sampling plate 3 is assembled in place by means of the pin shaft hole 3113 and the positioning pin 124 on the sampling plate fixing portion 12, and the nickel sheet 33 is welded on the connection busbar 2, the first pole output busbar 4, and the second pole output busbar 5.

[0157] Sixth, the fuse 6 is connected in series with the first negative copper sheet 52, the second negative copper sheet 53 is connected in series with the fuse 6, and the fuse cover plate 16 is buckled.

[0158] In summary, the battery pack 001 provided by the embodiments of the present disclosure integrates temperature detection design, voltage detection design, directional smoke exhaust design, high-temperature insulation design, connection row variable cross-section design (i.e., the second groove 21 is provided) and short-circuit protection design. The battery pack 001 provided by the embodiments of the present disclosure realizes multiple safety, and guarantees the safety of the battery pack 001 at each stage of avoiding thermal runaway of the battery cell 021, early thermal runaway of the battery cell 021 and late thermal runaway of the battery cell 021, and can more quickly monitor whether the battery pack 001 is in a safe state.

[0159] The embodiments of the present disclosure also provide a battery cabinet. As shown in FIG. 31, the battery cabinet includes a cabinet body 002 and a plurality of battery packs 001. The plurality of battery packs 001 are electrically connected and located inside the cabinet body 002. Among them, the plurality of battery packs 001 can be connected in series or in parallel.

[0160] As shown in FIGS. 31 and 32, the battery cabinet includes a connecting piece 003, which is used to connect the positive output terminal 08 and the negative output terminal 09 of the battery pack 001 with the positive output terminal 08 and the negative output terminal 09 of other battery packs 001, so as to realize series connection or parallel connection of different battery packs 001.

[0161] FIG. 33 shows a partial enlarged view of the part framed by block J in FIG. 31. As shown in FIG. 33, the battery pack explosion-proof valve 04 of each of the plurality of battery packs 001 is in communication with the cabinet flue 0021 of the cabinet body 002. In this way, the smoke sprayed by the battery pack explosion-proof valve 04 of the battery pack 001 flows into the cabinet flue 0021 for directional smoke exhaust, and will not diffuse randomly, thereby improving the safety of the battery cabinet.

[0162] The terms used in the embodiments of the present disclosure are only used to explain the embodiments of the present disclosure, and are not intended to limit the present disclosure. Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should be understood as the usual meaning understood by a person with ordinary skills in the art to which the present disclosure belongs. The above is only an optional embodiment of the present disclosure, and does not limit the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A battery pack, characterized by, The battery pack comprises a shell (01), a battery module (02) and an integrated busbar (03), the battery module (02) and the integrated busbar (03) are located inside the shell (01); The battery module (02) comprises at least one column of battery cells (021), each column of battery cells (021) comprises a plurality of battery cells (021); The integrated busbar (03) comprises an insulating support (1), a connecting busbar (2) and a sampling plate (3), the insulating support (1) is arranged on the battery module (02) in the opening direction of the battery cell explosion-proof valve (0212) of the battery cell (021), the sampling plate (3) and the connecting busbar (2) are arranged on the insulating support (1), and the connecting busbar (2) is used for electrically connecting the at least one column of battery cells (021); The insulating support (1) comprises a flue (121) and a plurality of channels (122), the flue (121) comprises a groove bottom and two side walls, the flue (121) is buckled on a column of battery cells (021), the groove bottom faces the battery cell explosion-proof valve (0212) of the column of battery cells (021), and the two side walls are located on both sides of the battery cell explosion-proof valve (0212) of the column of battery cells (021); The groove bottom of the flue (121) is provided with an opening of the plurality of channels (122), the side walls of the plurality of channels (122) extend along the opening direction of the battery cell explosion-proof valve (0212), one end of the side walls of the plurality of channels (122) is connected with the opening, and the other end of the side walls of the plurality of channels (122) is connected with the battery cell (021); A temperature sensor (32) electrically connected with the sampling plate (3) penetrates through the channel (122) to contact the battery cell (021), the position of the channel (122) is staggered with the battery cell explosion-proof valve (0212), and the side walls of the plurality of channels (122) separate the temperature sensor (32) and the battery cell explosion-proof valve (0212).

2. The battery pack of claim 1, wherein, The side walls of the channel (122), the side walls of the flue (121) and the top wall of the battery cell (021) surround a containing cavity, and the temperature sensor (32) is located in the containing cavity.

3. The battery pack of claim 1, wherein, The side walls of the channel (122) and the top wall of the battery cell (021) surround a containing cavity, and the temperature sensor (32) is located in the containing cavity.

4. The battery pack of any one of claims 1-3, wherein, The temperature sensor (32) is located between the connecting busbar (2) and the battery cell explosion-proof valve (0212), and the height of the side walls of the channel (122) is higher than the battery cell explosion-proof valve (0212) and the temperature sensor (32).

5. The battery pack of any one of claims 1-4, wherein, The insulating support (1) comprises a main plate (10), the main plate (10) comprises two connecting busbar fixing parts (11) and a sampling plate fixing part (12) located between the two connecting busbar fixing parts (11), the two connecting busbar fixing parts (11) are respectively used for fixing the connecting busbar (2), the sampling plate fixing part (12) is used for fixing the sampling plate (3), and the flue (121) and the channel (122) are arranged on the sampling plate fixing part (12). The insulating support (1) comprises a first side plate (13) connected with one end of the sampling plate fixed part (12), the first side plate (13) extends along the height direction of the battery module (02), and has a gap (130) between the first side plate (13) and the side wall of the battery module (02), the gap (130) is communicated with the flue (121).

6. The battery pack of claim 5, wherein, The battery pack (001) further comprises a battery pack explosion-proof valve (04) arranged on the shell wall opposite to the first side plate (13) of the shell (01).

7. The battery pack of claim 5 or 6, wherein, The groove bottom of the flue (121) comprises a plurality of first grooves (124), and the plurality of first grooves (124) are arranged opposite to a plurality of cell explosion-proof valves (0212) of the battery module (02) respectively.

8. The battery pack of any one of claims 5-7, wherein, Each of the connection rows (21) comprises two second grooves (21), and the groove bottoms of the two second grooves (21) are provided with positioning through holes (22), and the two positioning through holes (22) are opposite to two pole columns (0211) connected with the connection row (21) respectively.

9. The battery pack of any one of claims 5-7, wherein, The side of the connection row fixed part (11) away from the battery module (02) comprises a plurality of accommodating grooves (111), and the groove bottoms of the accommodating grooves (111) are provided with two openings (112), and two pole columns (0211) of the battery module (02) pass through the two openings (112) respectively. Each of the connection rows (21) is located in one of the accommodating grooves (111) and is welded with the two pole columns (0211).

10. The battery pack of claim 9, wherein, Each of the accommodating grooves (111) is provided with buckles (113) on the opposite two side walls, each of the connection rows (21) is provided with a buckle opening (23) on the opposite two side walls, and two buckles (113) are located in two buckle openings (23) respectively.

11. The battery pack of claim 9 or 10, wherein, The height of the side wall of the accommodating groove (111) is higher than the height of the connection row (21).

12. The battery pack of any one of claims 5-11, wherein, The insulating support (1) further comprises a second side plate (14) connected with one end of the main plate (10) and arranged opposite to the first side plate (13). The integrated busbar (03) further comprises a first pole output row (4) and a second pole output row (5), one end of the first pole output row (4) is fixed to the end of the connection row fixed part (11) away from the second side plate (14) and is electrically connected with the pole column (0211) of the cell (021) away from the second side plate (14), and one end of the second pole output row (5) is fixed to the end of the connection row fixed part (11) close to the second side plate (14) and is electrically connected with the pole column (0211) of the cell (021) close to the second side plate (14). The other end of the first pole output row (4) and the second pole output row (5) is fixed to the second side plate (14), wherein one of the first pole output row (4) and the second pole output row (5) is a positive pole output row, and the other is a negative pole output row.

13. The battery pack of claim 12, wherein, The insulating support (1) further comprises a third side plate (15) connected to one side of the main body plate (10) and located between the first side plate (13) and the second side plate (14); The first side plate (13) is provided with a first limiting groove (131), and the third side plate (15) is provided with a second limiting groove (151); The first pole output row (4) comprises a first section (411), a second section (412) and a third section (413) connected in sequence, the first section (411) extends into the first limiting groove (131), the second section (412) extends into the second limiting groove (151), and the third section (413) is fixed to the second side plate (14).

14. The battery pack of claim 12 or 13, wherein, The integrated busbar (03) further comprises a fuse (6) connected in series with the first pole output row (4) or the second pole output row (5), and the fuse (6) is fixed to the second side plate (14) away from the battery module (02).

15. The battery pack of any one of claims 12-14, wherein, The integrated busbar (03) further comprises at least one insulating sleeve (7) sleeving the first pole output row (4) and / or the second pole output row (5).

16. The battery pack of any one of claims 12-15, wherein, The circuit board (31) comprises a first plate body (311) and a second plate body (312), the first plate body (311) is fixed to the sampling plate fixing portion (12), and the second plate body (312) is bent relative to the first plate body (311), and a part of the second plate body (312) is fixed to the second side plate (14). The sampling plate (3) further comprises a data output connector (34) fixed to one end of the second plate body (312) away from the first plate body (311).

17. The battery pack of claim 16, wherein, The sampling plate (3) further comprises an OT terminal connector (35) fixed to the second plate body (312) and electrically connected to the data output connector (34). The integrated busbar (03) further comprises at least one OT terminal (8) provided on the first pole output row (4) and / or the second pole output row (5), and the at least one OT terminal (8) is electrically connected to the OT terminal connector (35).

18. The battery pack of claim 16 or 17, wherein, The shell (01) comprises a bottom shell (011), a top cover (012) and an end cover assembly (013), one of the bottom shell (011) and the top cover (012) is provided with a port (0111) opposite to the second side plate (14), the end cover assembly (013) seals the port (0111), and the end cover assembly (013) comprises a containing cavity. The battery pack (001) further comprises a battery management unit (05), and the battery management unit (05) and the data output connector (34) are located in the containing cavity and are electrically connected.

19. The battery pack of claim 18, wherein, The end cover assembly (013) comprises a first end plate (0131), a cover plate (0132) and a partition plate (0133). The first end plate (0131) is located at the port (0111), and the first end plate (0131) is provided with a connector through hole (01311) for the data output connector (34) to pass through; The cover plate (0132) and the first end plate (0131) form the containing cavity, the partition plate (0133) is located in the containing cavity and closes a part of the connector through hole (01311), and a gap (01310) is formed between the partition plate (0133) and the hole wall of the connector through hole (01311); The second plate body (312) passes through the gap (01310), and the battery management unit (05) is fixed to the side of the partition plate (0133) away from the first end plate (0131).

20. The battery pack of any one of claims 12-19, wherein, The integrated busbar (03) further comprises a first insulating sheet (9) attached to the side of the second side plate (14) facing the battery module (02).

21. A battery cabinet, characterized by The battery cabinet comprises a cabinet body (002) and a plurality of battery packs (001) according to any one of claims 1-20, and the plurality of battery packs (001) are electrically connected and located in the interior of the cabinet body (002). The battery pack (001) comprises a battery pack explosion-proof valve (04), and the battery pack explosion-proof valves (04) of the plurality of battery packs (001) are all in communication with the cabinet flue (0021) of the cabinet body (002).

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