Battery pack

Abstract

The invention provides a battery pack, the battery pack comprises a plurality of first side plates connected in sequence, at least one first side plate is internally provided with a first pressure relief channel, battery cells in a first battery cell module can be subjected to pressure relief through a cavity and the first pressure relief channel, and battery cells in a second battery cell module can be subjected to pressure relief through a second pressure relief channel. The two battery cell modules can independently release pressure, so that mutual influence of the plurality of battery cell modules under thermal runaway or thermal spread of the battery pack is effectively prevented, and the safety of the battery pack is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack. Background Art

[0002] Since electric vehicles have high requirements for battery system energy and structural strength of battery packs, batteries play a vital role in these models, which directly determines the vehicle's endurance, power performance and charging efficiency. In related technologies, there are few battery system solutions for double-layer large cylindrical cells, and the upper and lower pressure relief chambers are not independently developed and designed, which will cause the two layers of pressure relief systems to affect each other during thermal runaway. Summary of the invention

[0003] The embodiments of the present application provide a battery pack that can improve the technical problem of mutual influence of multi-layer modules of the battery pack during thermal runaway.

[0004] An embodiment of the present application provides a battery pack, the battery pack comprising:

[0005] The box body comprises a bottom plate and a plurality of first side plates connected in sequence, wherein the plurality of first side plates are arranged around the periphery of the bottom plate and form a containing space with the bottom plate, and at least one of the first side plates is provided with a first pressure relief channel;

[0006] A partition, fixed in the accommodation space, and dividing the accommodation chamber into a first chamber and a second chamber;

[0007] A first battery cell module is disposed in the first chamber, and the first battery cell module can release pressure through the cavity and the first pressure relief channel;

[0008] The second battery cell module is disposed in the second chamber, and the second battery cell module can release pressure through the second pressure relief channel.

[0009] In some embodiments, a plurality of second side panels connected in sequence are arranged in the accommodation space, each of the second side panels is attached to one of the first side panels, and at least one of the second side panels is provided with a second pressure relief channel and a cavity isolated from each other, the cavity is connected to the first pressure relief channel, and the second pressure relief channel is connected to the pressure relief outlet;

[0010] In some embodiments, a first pressure relief space is provided in the partition, the first pressure relief space is communicated with the cavity, and is communicated with the first pressure relief channel through the cavity.

[0011] In some embodiments, the battery pack further includes a first connecting beam, the first connecting beam being connected between the partition and the first side plate, the first connecting beam being provided with a first pressure conducting channel, and the first pressure conducting channel connecting the first pressure relief space and the first pressure relief channel.

[0012] In some embodiments, the separator includes a first bracket and a partition, the first bracket is used to support the first battery cell module, and the first bracket and the partition are spaced apart to form a first pressure relief space;

[0013] The first connecting beam includes a first connecting plate and a second connecting plate connected to each other, the first connecting plate is connected to a side of the first bracket facing the bottom plate for supporting the first bracket, and the second connecting plate is connected to a side of the partition facing the bottom plate for supporting the partition.

[0014] The first battery cell module includes a first sub-module and a second sub-module, the first sub-module and the second sub-module are spaced apart in the first chamber, the first sub-module and the second sub-module are respectively provided with a partition, each partition also includes a baffle, the baffle is connected between the first bracket and the partition to separate the first pressure relief space corresponding to the first sub-module and the second sub-module, the battery pack also includes a first support rib, one end of the first support rib is connected to the first connecting beam, and the other end of the first support rib is connected to the baffle.

[0015] In some embodiments, the second battery cell module includes a third sub-module and a fourth sub-module, and the third sub-module and the fourth sub-module are spaced apart in the second chamber. The battery pack also includes a crossbeam and a second support rib, and the crossbeam is arranged between the third sub-module and the fourth sub-module to separate the third sub-module and the fourth sub-module, one end of the second support rib is connected to the second side panel, and the other end of the second support rib is connected to the crossbeam.

[0016] In some embodiments, the first bracket is a plastic bracket, and the partition is a PCM composite partition.

[0017] In some embodiments, the battery pack further includes a seal, and the seal is disposed between the second side plate and the first connecting beam.

[0018] In some embodiments, the first side panel further includes a plurality of ribs, a first side wall and a second side wall arranged opposite to each other, the plurality of ribs being connected between the first side wall and the second side wall, the first side panel further includes a bottom wall arranged close to the bottom plate, the bottom wall, one of the ribs, the first side wall and the second side wall forming the first pressure relief channel.

[0019] In some embodiments, the box body also includes a second bracket and a second connecting beam, the second bracket is used to support the second battery cell module, the second bracket and the bottom plate are spaced apart to form a second pressure relief space, the second connecting beam is provided with a second pressure conducting channel, and the second pressure conducting channel connects the second pressure relief space and the second pressure relief channel.

[0020] In some embodiments, the battery pack further includes a support member, one end of the support member is connected to one of the first side plates, and the other end of the support member is connected to the first connecting beam.

[0021] In some embodiments, the battery pack further includes a first explosion-proof valve and a second explosion-proof valve, wherein the first explosion-proof valve is mounted on the first side plate, and the first explosion-proof valve is used to control the pressure relief of thermal runaway of the first battery cell module;

[0022] The first side plate is provided with the pressure relief outlet, and the second explosion-proof valve is installed at the pressure relief outlet. The battery pack also includes an isolation sleeve, which passes through the first side plate and connects the second pressure relief channel and the pressure relief outlet. The second explosion-proof valve is used to control the pressure relief of thermal runaway of the second battery cell module.

[0023] In some embodiments, the battery pack includes a first side plate extending along a first direction and two first side plates extending along a second direction, the first side plate extending along the first direction is connected between the two first side plates extending along the second direction, and the first side plates extending along different directions are at least partially provided with the first pressure relief channel, and the first pressure relief channels provided in the first side plates extending along different directions are interconnected, and the first direction is perpendicular to the second direction;

[0024] The first explosion-proof valve and the second explosion-proof valve are installed on the first side plate extending along a first direction.

[0025] In some embodiments, the battery pack includes two first explosion-proof valves and two second explosion-proof valves, the two second explosion-proof valves are installed at intervals in the middle of the first side panel, and the two second explosion-proof valves are arranged between the two first explosion-proof valves.

[0026] Beneficial effects of the embodiments of the present application:

[0027] The battery pack of the present application includes a plurality of first side plates connected in sequence, and a first pressure relief channel is provided in at least one of the first side plates. The battery cells of the first battery cell module can be relieved of pressure through the first pressure relief channel, and the battery cells of the second battery cell module can be relieved of pressure through the second pressure relief channel. The two battery cell modules can relieve pressure independently, thereby effectively preventing thermal runaway of the battery pack or mutual influence of multiple battery cell modules under heat spread, thereby improving the safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 A top view of the battery pack provided in the embodiment of the present application Figure 1 ;

[0030] Figure 2 yes Figure 1 A schematic diagram of the cross section of the battery pack along AA is provided;

[0031] Figure 3 yes Figure 2 An enlarged schematic diagram of a battery pack portion A is provided;

[0032] Figure 4 A top view of the battery pack provided in the embodiment of the present application Figure 2 ;

[0033] Figure 5 yes Figure 4 A schematic cross-sectional view of the battery pack along the BB is provided;

[0034] Figure 6 yes Figure 6 An enlarged schematic diagram of a battery pack portion B is provided;

[0035] Figure 7 is an exploded view of a battery pack provided in an embodiment of the present application;

[0036] Figure 8 yes Figure 7 The structure of the box provided Figure 1 ;

[0037] Fig. 9 yes Figure 8 An enlarged schematic diagram of a box part C is provided;

[0038] Fig.10 yes Figure 8 An enlarged schematic diagram of a local portion D of the box is provided;

[0039] Fig.11 yes Figure 7 The structure of the box provided Figure 2 ;

[0040] Fig.12 yes Fig.11 An enlarged schematic diagram of a local E of the box is provided;

[0041] Fig.13is a side view of a battery pack provided in an embodiment of the present application;

[0042] Fig.14 yes Fig.13 A schematic cross-sectional view of the battery pack along CC is provided;

[0043] Fig.15 yes Fig.14 An enlarged schematic diagram of a local F of the battery pack is provided;

[0044] Fig.16 yes Fig.13 A top view of the box is provided.

[0045] Reference numerals:

[0046] 1000, battery pack;

[0047] 10. Box body; 11. First side plate; 110. First pressure relief channel; 111. First side wall; 112. Second side wall; 113. Muscle body; 1131. Fourth pressure relief port; 114. Bottom wall; 12. Bottom plate;

[0048] 20, second side plate; 201, second pressure relief channel; 202, cavity; 131, third side wall; 1311, third pressure relief port; 132, fourth side wall;

[0049] 30. separator; 301. first pressure relief space; 31. first bracket; 32. partition;

[0050] 40. A first battery cell module; 50. A second battery cell module;

[0051] 60, first connecting beam; 601, first pressure-conducting channel; 61, first connecting plate; 611, first pressure relief port; 612, second pressure relief port; 62, second connecting plate;

[0052] 70. Seals;

[0053] 80, second connecting beam; 801, second pressure-conducting channel; 803, second bracket; 804, second pressure-relieving space;

[0054] 90, support member; 901, first support plate; 902, second support plate; 903, enclosure plate;

[0055] 100. first supporting rib; 1001. baffle;

[0056] 200, second supporting rib; 2001, crossbeam;

[0057] 300, the first explosion-proof valve;

[0058] 400. Second explosion-proof valve; 4001. Isolation sleeve. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the directional words such as "upper" and "lower" used generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0060] Please refer to Figure 1-Figure 2 , Figure 1 A top view of the battery pack provided in the embodiment of the present application Figure 1 , Figure 2 yes Figure 1 The provided battery pack is a cross-sectional diagram along the AA size. Figure 3 yes Figure 2 An enlarged schematic diagram of a battery pack local A is provided. The present application provides a battery pack 1000, the battery pack 1000 includes a box body 10, the box body 10 includes a bottom plate 12 and a plurality of first side plates 11 connected in sequence, the plurality of first side plates 11 are arranged around the periphery of the bottom plate 12, and form the accommodation space with the bottom plate 12, and at least one of the first side plates 11 is provided with a first pressure relief channel 110. The battery pack 1000 also includes a partition 30, a first battery cell module 40 and a second battery cell module 50, the partition 30 is fixed in the accommodation space, and divides the accommodation chamber into a first chamber and a second chamber. The first battery cell module 40 is arranged in the first chamber, and the first battery cell module 40 can relieve pressure through the cavity 202 and the first pressure relief channel 110, and the second battery cell module 50 is arranged in the second chamber, and the second battery cell module 50 can relieve pressure through the second pressure relief channel 201.

[0061] In some examples, the second chamber is located between the partition 30 and the bottom plate 12, and the first chamber is located between the partition 30 and the side away from the bottom plate 12. This application is described by taking this as an example. In some examples, the first chamber may be located between the partition 30 and the bottom plate 12, and the second chamber may be located between the partition 30 and the side away from the bottom plate 12.

[0062] In some examples, the cells of the first cell module 40 and the second cell module 50 are both cylindrical cells, and this application uses this as an example for explanation. In some examples, the cells may also be square cells.

[0063] In electrical equipment, especially electric vehicles, high requirements are placed on the energy of the battery system and the structural strength of the battery pack. The battery directly determines the vehicle's endurance, power performance, and charging efficiency. In related technologies, there are relatively few battery system solutions for double-layer large cylindrical cells, and none of them have independently developed a pressure relief design. As a result, the two layers of the pressure relief system will affect each other during thermal runaway, and the pressure relief chamber may even be too large to open the valve normally, ultimately affecting the overall safety of the battery pack.

[0064] The battery pack 1000 provided in the present application comprises a plurality of first side panels 11 connected in sequence, and at least one of the first side panels 11 is provided with a first pressure relief channel 110. When the battery cells in the first battery cell module 40 need to be relieved of pressure, gas can enter the first pressure relief channel 110 from the battery cells. When the battery cells in the second battery cell module 50 need to be relieved of pressure, gas can enter the second pressure relief channel 201 from the battery cells. Since the first pressure relief channel 110 and the second pressure relief channel 201 are isolated from each other, the first battery cell module 40 and the second battery cell module 50 can achieve independent pressure relief of the double-layer modules, thereby effectively preventing the battery pack 1000 from thermal runaway or mutual influence of multiple battery cell modules under heat spread, thereby improving the safety of the battery pack 1000.

[0065] In some embodiments, the box body 10 is provided with a pressure relief outlet, and the battery pack 1000 also includes a plurality of second side panels 20 connected in sequence, the second side panels 20 are arranged in the accommodating space, each second side panel 20 is attached to one of the first side panels 11, and at least one of the second side panels 20 is provided with a second pressure relief channel 201 and a cavity 202 isolated from each other, the cavity 202 is connected to the first pressure relief channel 110, and the second pressure relief channel 201 is connected to the pressure relief outlet.

[0066] It is understandable that, since the first side plate 11 is arranged on the outside and the second side plate 20 is arranged on the inside, the pressure relief paths of the two pressure relief channels are not the same. The first battery cell module 40 passes through the cavity 202 in the second side plate 20, so that the gas can enter the first pressure relief channel 110 in the first side plate 11, complete the flow of gas from the inside to the outside, and then release pressure to the outside from the pressure relief structure on the first side plate 11. The gas of the second battery cell module 50 flows in the second pressure relief channel 201, but due to the obstruction of the first side plate 11, the second pressure relief channel 201 needs to cooperate with the pressure relief outlet on the box body 10, so that the gas can finally flow from the inside to the outside to complete the pressure relief.

[0067] In some embodiments, a first pressure relief space 301 is provided in the partition 30 . The first pressure relief space 301 is communicated with the cavity 202 , and is communicated with the first pressure relief channel 201 through the cavity 202 .

[0068] Specifically, the separator 30 is used to separate the first battery cell module 40 and the second battery cell module 50. The first pressure relief space 301 can prevent the thermal runaway gas generated by the first battery cell module 40 from entering the second chamber, and at the same time ensure that the first battery cell module 40 of the battery can safely release pressure when the internal pressure increases, thereby avoiding serious consequences such as battery expansion, rupture, fire or explosion due to gas accumulation.

[0069] In some embodiments, the battery pack 1000 also includes a first connecting beam 60, which is connected between the partition 30 and the first side plate 11, and the first connecting beam 60 is provided with a first pressure-conducting channel 601, which connects the first pressure relief space 301 and the first pressure relief channel 110.

[0070] Specifically, the first connecting beam 60 includes a first side surface facing the first pressure relief space 301 and a first bottom surface facing the second side panel 20, the second side panel 20 includes a side panel top surface facing the first bottom surface, the first side surface is provided with a first pressure relief port 611, the first bottom surface is provided with a second pressure relief port 612, and the side panel top surface is correspondingly provided with another second pressure relief port 612, and the gas in the first pressure relief space 301 can enter the cavity 202 through the first pressure relief port 611 and the second pressure relief port 612.

[0071] The first side plate 11 includes a first side wall 111 and a second side wall 112 that are oppositely arranged, and the second side plate 20 includes a third side wall 131 and a fourth side wall 132 that are oppositely arranged, the second side wall 112 is attached to the third side wall 131, the second side wall 112 is provided with a third pressure relief port 1311, and the third side wall 131 is correspondingly provided with another third pressure relief port 1311, and the gas in the cavity 202 enters the first pressure relief channel 110 through the third pressure relief port 1311.

[0072] In some embodiments, the partition 30 includes a first bracket 31 and a partition 32, the first bracket 31 is used to support the first battery module 40, and the first bracket 31 and the partition 32 are spaced apart to form a first pressure relief space 301. The first connecting beam 60 includes a first connecting plate 61 and a second connecting plate 62, the first connecting plate 61 is connected to a side of the first bracket 31 facing the bottom plate 12, and is used to support the first bracket 31, and the second connecting plate 62 is connected to a side of the partition 32 facing the bottom plate 12, and is used to support the partition 32.

[0073] It can be understood that the first connecting beam 60 can not only conduct pressure relief for the first battery cell module 40 , but also improve the supporting strength of the battery pack 1000 . The first connecting plate 61 provides support for the first bracket 31 , and the second connecting plate 62 provides support for the partition 32 .

[0074] In some examples, the first connecting plate 61 and the first bracket 31 can be connected by welding, screwing, riveting, etc., such as screwing by screws, bolts, studs and other structures, and the second connecting plate 62 and the partition 32 can be connected by welding, screwing, riveting, etc., such as screwing by screws, bolts, studs and other structures, which is not limited in this application.

[0075] Please refer to Figure 4-Figure 6 , Figure 4 A top view of the battery pack provided in the embodiment of the present application Figure 2 , Figure 5 yes Figure 4 The provided schematic diagram of the cross section of the battery pack along the BB, Figure 6 yes Figure 6 An enlarged schematic diagram of a battery pack part B is provided. In some embodiments, the battery pack 1000 further includes a seal 70 , and the seal 70 is attached between the second side plate 20 and the first connecting beam 60 .

[0076] Specifically, the seal 70 is attached between the first bottom surface of the first connecting plate 61 and the top surface of the side plate of the second side plate 20, and the first bottom surface and the top surface of the side plate can be fixed through the seal 70 by means of studs, bolts and other structures. Since the second pressure relief port 612 is provided between the first bottom surface and the top surface of the side plate, the seal 70 can effectively prevent the gas from leaking from between the two contact surfaces when entering the cavity 202 from the second pressure relief port 612. In addition, the seal 70 also has the function of reducing friction and wear, and can extend the service life of the parts. The seal 70 can be made of materials such as rubber and silicone, and the present application does not limit the material of the seal 70.

[0077] In some embodiments, the first side plate 11 further includes a plurality of ribs 113, a first side wall 111 and a second side wall 112 arranged opposite to each other, the plurality of ribs 113 are connected between the first side wall 111 and the second side wall 112, the first side plate 11 further includes a bottom wall 114 arranged close to the bottom plate 12, the bottom wall 114, the ribs 113, the first side wall 111 and the second side wall 112 form a first pressure relief channel 110.

[0078] Specifically, the first side panel 11 includes a plurality of ribs 113 arranged at intervals, one end of the rib 113 is connected to the first side wall 111, and the other end is connected to the second side wall 112. The provision of the rib 113 can effectively limit the deformation of the first side wall 111 and the second side wall 112, thereby ensuring the stability of the structure.

[0079] In some examples, the ribs 113 include a first rib and a second rib, the first rib is close to the bottom wall 114 and is provided with a fourth pressure relief port 1131, the second rib is provided on the side of the first rib away from the bottom wall 114, the third pressure relief port 1311 is provided between the first rib and the second rib, the second rib without the fourth pressure relief port 1131 can prevent the gas from flowing in a direction away from the bottom plate 12, and the second rib, the bottom wall 114, the first side wall 111 and the second side wall 112 form a first pressure relief channel 110. After the gas enters the first pressure relief channel 110 from the third pressure relief port 1311, the gas in the first pressure relief channel 110 can flow toward the bottom wall 114 through the fourth pressure relief port 1131 and finally be led out to the outside.

[0080] In some embodiments, the box body 10 also includes a second bracket 803 and a second connecting beam 80, the second bracket 803 is used to support the second battery cell module 50, the second bracket 803 and the bottom plate 12 are spaced apart to form a second pressure relief space 804, the second connecting beam 80 is provided with a second pressure conducting channel 801, and the second pressure conducting channel 801 connects the second pressure relief space 804 and the second pressure relief channel 201.

[0081] Specifically, the second connecting beam 80 includes a second side surface facing the second pressure relief space 804, the second side surface is provided with a fifth pressure relief port, the fourth side wall 132 is provided with a sixth pressure relief port, the fifth pressure relief port and the sixth pressure relief port are arranged correspondingly, and the gas in the second pressure relief space 804 can enter the second pressure relief channel 201 through the fifth pressure relief port and the sixth pressure relief port.

[0082] Please refer to Figure 7 , Figure 7 It is an exploded view of the battery pack provided in the embodiment of the present application. In some embodiments, the CTP (Ce ll to Pack) design is adopted between the entire battery pack 1000 and the battery cell module, and the overall height of the battery pack 1000 is between 110mm-320mm, and the length is between 1000mm-2100mm. By directly installing the battery cells (Ce ll) in the battery pack 1000 in a reasonable arrangement, the structure of the battery pack 1000 is simpler and the energy density is higher, which can reduce additional components and complex assembly processes, while improving the overall performance of the battery system, and can also effectively reduce weight and cost.

[0083] Please refer to Figure 8-Figure 9 , Figure 8 yes Figure 7 The structure of the box provided Figure 1 , Fig. 9 yes Figure 8An enlarged schematic diagram of a box part C is provided. In some embodiments, the battery pack 1000 further includes a support member 90 , one end of the support member 90 is connected to one of the first side plates 11 , and the other end is connected to the first connecting beam 60 .

[0084] Specifically, the support member 90 includes a first support plate 901 and a second support plate 902 and two enclosures 903 that are vertically connected. The first support plate 901 is connected to the first side plate 11, the second support plate 902 is connected to the top of the first connecting beam 60, and the enclosure 903 is a triangular structure. The two enclosures 903 are arranged opposite to each other, one right-angled side of the triangle is connected to the first support plate 901, and the other right-angled side of the triangle is connected to the second support plate 902.

[0085] Among them, the support member 90 can be an integrally formed structure, the first support plate 901 can be connected to the second side wall 112 by screwing, riveting, clamping, etc., and the other support plate 902 can be connected to the top of the first connecting beam 60 by screwing, riveting, clamping, etc.

[0086] Please refer to Fig.10 , Fig.10 yes Figure 8 An enlarged schematic diagram of a local portion D of the box is provided. In some embodiments, the first battery module 40 includes a first submodule and a second submodule, the first submodule and the second submodule are arranged at intervals in the first chamber, and the first submodule and the second submodule are provided with a partition 30, each of which further includes a baffle 1001, and the baffle 1001 is connected between the first bracket 31 and the partition 32 to separate the first pressure relief space 301 corresponding to the first submodule and the second submodule, and the battery pack 1000 further includes a first support rib 100, the first support rib 100 is a triangular structure, one right-angled side of the first support rib 100 is connected to the first connecting beam 60, and the other right-angled side of the first support rib 100 is connected to one end of the baffle 1001. Among them, the first support rib 100 can be fixed to the second connecting plate 62 by a screw, a bolt, a stud or the like. The first support rib 100 is provided to ensure the stability of the structure of the partition 30 and improve the support effect on the first battery module 40.

[0087] Please refer to Figure 11-Figure 12 , Fig.11 yes Figure 7 The structure of the box provided Figure 2 , Fig.12 yes Fig.11An enlarged schematic diagram of a local E of the box is provided. In some embodiments, the second battery cell module 50 includes a third submodule and a fourth submodule, and the third submodule and the fourth submodule are arranged at intervals in the second chamber. The battery pack 1000 also includes a crossbeam 2001, and the crossbeam 2001 is arranged between the third submodule and the fourth submodule. The battery pack 1000 also includes a second support rib 200, and one end of the second support rib 200 is connected to the box 10, and the other end of the second support rib 200 is connected to the crossbeam 2001. For example, the second support rib 200 can be connected obliquely between the second side plate 20 and the crossbeam 2001 to improve the support strength of the structure. By strengthening the structure at both ends of the crossbeam 2001, the impact is reduced when the side column hits the extrusion condition, and the force is evenly decomposed to the box 10, reducing the stress concentration at both ends of the crossbeam 2001.

[0088] In some embodiments, the first bracket 31 is a plastic bracket, such as PC+ABS mixed plastic, which can have the easy processing of ABS and the excellent thermal stability of PC; the partition 32 can be a PCM composite partition, such as PCM composite steel plate. PCM material has the advantages of both organic polymers and thin plate substrates, has good formability, high strength and easy processing, and can usually provide higher strength and rigidity than a single material. For example, a steel plate can be combined with a high-strength alloy or a reinforced fiber layer to form a composite steel plate to enhance its tensile strength, compressive strength and bending resistance. The first bracket 31 and the partition 32 are made of different materials, which can be better suitable for the battery pack 1000.

[0089] Please refer to Figure 12-Figure 15 , Fig.13 is a side view of a battery pack provided in an embodiment of the present application, Fig.14 yes Fig.13 The cross-sectional diagram of the battery pack along CC is provided. Fig.15 yes Fig.14 An enlarged schematic diagram of a local F of the battery pack is provided. In some embodiments, the battery pack 1000 further includes a first explosion-proof valve 300 and a second explosion-proof valve 400, wherein the first explosion-proof valve 300 is installed on the first side plate 11, and the first explosion-proof valve 300 is used to control the pressure relief of the first battery cell module 40 due to thermal runaway. The first side plate 11 is provided with the pressure relief outlet, and the second explosion-proof valve 400 is installed on the pressure relief outlet. The battery pack 1000 further includes an isolation sleeve 4001, which passes through the first side plate 11 and connects the second pressure relief channel 201 and the pressure relief outlet, and the second explosion-proof valve 400 is used to control the pressure relief of the second battery cell module 50 due to thermal runaway.

[0090] When gas accumulates inside the battery due to overcharging, short circuit, high temperature or internal chemical reaction, causing the internal pressure of the battery to increase, the explosion-proof valve can automatically open to release excess gas to prevent the battery casing from rupturing or exploding due to excessive pressure.

[0091] Specifically, the second explosion-proof valve 400 includes a sealing plate and a valve core, the sealing plate is installed on the pressure relief port, the valve core is connected to the sealing plate and protrudes toward the second side plate 20, the isolation sleeve 4001 is located in the first pressure relief channel 110, and the extension length of the isolation sleeve 4001 in the first side plate 11 can be equal to the width of the first pressure relief channel 110, or it can be partially penetrated through the first side plate 11 and extend into the second pressure relief channel 201. The valve core is arranged in the isolation sleeve 4001. When the battery is working normally, the valve core is in a closed state to ensure that the battery does not leak gas.

[0092] When the pressure exceeds the set threshold, the valve core will be forced to move or rupture due to the driving force of the gas or the spring load of the explosion-proof valve, allowing the gas inside the battery to be quickly released through this channel.

[0093] It can be understood that the first explosion-proof valve 300 also includes a sealing plate and a valve core that are similar or identical to those of the second explosion-proof valve 400 , and the present application will not repeat them here.

[0094] When gas accumulates inside the battery due to overcharging, short circuit, high temperature or internal chemical reaction, causing the internal pressure of the battery to increase, the explosion-proof valve can automatically open to release excess gas to prevent the battery casing from rupturing or exploding due to excessive pressure.

[0095] Please refer to Fig.16 , Fig.16 yes Fig.13 A top view of the box is provided. In some embodiments, the battery pack 1000 includes a first side plate 11 extending along a first direction and two first side plates 11 extending along a second direction, the first side plate 11 extending along the first direction is connected between the two first side plates 11 extending along the second direction, and the first side plates 11 extending along different directions are at least partially provided with the first pressure relief channel 110, the first pressure relief channels 110 provided in the first side plates 11 extending along different directions are interconnected, the first direction is perpendicular to the second direction, and the first explosion-proof valve 300 and the second explosion-proof valve 400 are installed on the first side plate 11 extending along the first direction.

[0096] It can be understood that the first pressure relief channel 110 and the second pressure relief channel 201 both form an annular pressure relief path. The first pressure relief channel 110 is arranged outside the second pressure relief channel 201. The annular path can make full use of the space of the battery pack 1000. When the battery is thermally runaway, the release of gas can be evenly distributed through the entire annular channel and released through the explosion-proof valve. Compared with the traditional single pressure relief channel, the annular structure helps to release pressure more smoothly and evenly.

[0097] In some embodiments, the battery pack 1000 includes two first explosion-proof valves 300 and two second explosion-proof valves 400 , the two second explosion-proof valves 400 are installed at intervals in the middle of the first side plate 11 , and the two second explosion-proof valves 400 are arranged between the two first explosion-proof valves 300 .

[0098] It can be understood that the battery pack 1000 includes two first side panels 11 extending along the second direction, and the gas of the first battery module 40 and the second battery module 50 will escape from both sides. The two first explosion-proof valves 300 and the two second explosion-proof valves 400 can facilitate the pressure relief of gas on different sides. In addition, since the second pressure relief channel 201 is located inside, in order to allow the gas in the second pressure relief channel 201 to be smoothly relieved to the outside, the pressure relief path of the second pressure relief channel 201 is longer than the pressure relief path of the first pressure relief channel 110 to avoid blocking the pressure relief of the first pressure relief channel 110. Therefore, the second explosion-proof valve 400 is arranged in the middle of the first side panel 11, and the first explosion-proof valve 300 is arranged on both sides of the two second explosion-proof valves 400.

[0099] The first direction may be a length direction of the battery pack 1000 , and the second direction may be a width direction of the battery pack 1000 .

[0100] The battery pack 1000 provided in the present application is applied to electrical equipment, which may be electric vehicles, electric tools, electric bicycles, energy storage systems, drones, mobile devices, etc.

[0101] In some examples, the electrical device is an electric vehicle. It is understandable that the power battery is the core of the electric vehicle and can provide driving power for the electric vehicle. The battery pack 1000 provided in the present application can prevent the two-layer pressure relief system from interfering with each other or the valve cannot be opened normally due to the large volume of the pressure relief chamber, thereby improving the safety of the power vehicle.

[0102] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A battery pack, characterized in that: The battery pack comprises: A box body, the box body comprising a bottom plate and a plurality of first side plates connected in sequence, the plurality of first side plates being arranged around the periphery of the bottom plate and forming a receiving space with the bottom plate, the box body being provided with a first pressure relief channel and a second pressure relief channel isolated from each other; A partition, fixed in the accommodation space, and dividing the accommodation chamber into a first chamber and a second chamber; A first battery cell module is disposed in the first chamber, and the first battery cell module can release pressure through the first pressure relief channel; The second battery cell module is disposed in the second chamber, and the second battery cell module can release pressure through the second pressure relief channel.

2. The battery pack according to claim 1, characterized in that: The box body is provided with a pressure relief outlet, and at least one of the first side panels is provided with a first pressure relief channel; The battery pack also includes a plurality of second side panels connected in sequence, wherein the second side panels are arranged in the accommodating space, each of the second side panels is attached to one of the first side panels, and at least one of the second side panels is provided with a second pressure relief channel and a cavity isolated from each other, wherein the cavity is connected to the first pressure relief channel, and the second pressure relief channel is connected to the pressure relief outlet.

3. The battery pack according to claim 2, characterized in that: A first pressure relief space is provided in the partition, the first pressure relief space is communicated with the cavity, and is communicated with the first pressure relief channel through the cavity.

4. The battery pack according to claim 3, characterized in that: The battery pack further includes a first connecting beam connected between the partition and the first side plate, the first connecting beam being provided with a first pressure conducting channel connecting the first pressure relief space and the first pressure relief channel.

5. The battery pack according to claim 4, characterized in that: The separator comprises a first bracket and a partition, the first bracket is used to support the first battery cell module, and the first bracket and the partition are spaced apart to form a first pressure relief space; The first connecting beam includes a first connecting plate and a second connecting plate connected to each other, the first connecting plate is connected to a side of the first bracket facing the bottom plate for supporting the first bracket, and the second connecting plate is connected to a side of the partition facing the bottom plate for supporting the partition.

6. The battery pack according to claim 5, characterized in that: The first battery cell module includes a first sub-module and a second sub-module, the first sub-module and the second sub-module are spaced apart in the first chamber, the battery pack also includes a baffle, the baffle is connected between the first bracket and the partition to separate the first pressure relief space corresponding to the first sub-module and the second sub-module, the battery pack also includes a first support rib, one end of the first support rib is connected to the first connecting beam, and the other end of the first support rib is connected to the baffle.

7. The battery pack according to claim 5, characterized in that: The second battery cell module includes a third sub-module and a fourth sub-module, and the third sub-module and the fourth sub-module are spaced apart in the second chamber. The battery pack also includes a crossbeam and a second supporting rib, and the crossbeam is arranged between the third sub-module and the fourth sub-module to separate the third sub-module and the fourth sub-module, and one end of the second supporting rib is connected to the second side plate, and the other end of the second supporting rib is connected to the crossbeam.

8. The battery pack according to claim 5, characterized in that: The first bracket is a plastic bracket, and the partition is a PCM composite partition.

9. The battery pack according to claim 4, characterized in that: The battery pack further includes a seal, which is disposed between the second side plate and the first connecting beam.

10. The battery pack according to claim 4, characterized in that: The battery pack further includes a support member, one end of which is connected to one of the first side plates, and the other end of which is connected to the first connecting beam.

11. The battery pack according to any one of claims 1 to 10, characterized in that: The first side plate also includes a plurality of ribs, a first side wall and a second side wall arranged opposite to each other, wherein the plurality of ribs are connected between the first side wall and the second side wall, and the first side plate also includes a bottom wall arranged close to the bottom plate, and the bottom wall, one of the ribs, the first side wall and the second side wall form the first pressure relief channel.

12. The battery pack according to any one of claims 1 to 10, characterized in that: The box body also includes a second bracket and a second connecting beam, the second bracket is used to support the second battery cell module, the second bracket and the bottom plate are spaced apart to form a second pressure relief space, the second connecting beam is provided with a second pressure conducting channel, and the second pressure conducting channel connects the second pressure relief space and the second pressure relief channel.

13. The battery pack according to any one of claims 1 to 10, characterized in that: The battery pack further includes a first explosion-proof valve and a second explosion-proof valve, wherein the first explosion-proof valve is installed on the first side plate, and the first explosion-proof valve is used for decompression of thermal runaway of the first battery cell module; The first side plate is provided with the pressure relief outlet, and the second explosion-proof valve is installed at the pressure relief outlet. The battery pack also includes an isolation sleeve, which passes through the first side plate and connects the second pressure relief channel and the pressure relief outlet. The second explosion-proof valve is used for pressure relief in case of thermal runaway of the second battery cell module.

14. The battery pack according to claim 13, characterized in that: The battery pack includes a first side plate extending along a first direction and two first side plates extending along a second direction, the first side plate extending along the first direction is connected between the two first side plates extending along the second direction, the first side plates extending along different directions are at least partially provided with the first pressure relief channels, and the first pressure relief channels provided in the first side plates extending along different directions are interconnected, and the first direction is perpendicular to the second direction; The first explosion-proof valve and the second explosion-proof valve are installed on the first side plate extending along a first direction.

15. The battery pack according to claim 13, characterized in that: The battery pack includes two first explosion-proof valves and two second explosion-proof valves, the two second explosion-proof valves are installed at intervals in the middle of the first side plate, and the two second explosion-proof valves are arranged between the two first explosion-proof valves.

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