Pressure relief rack assembly and battery module

Abstract

A pressure relief rack assembly (10b) and a battery module (10). The pressure relief rack assembly (10b) comprises: a pressure relief rack (11), wherein accommodating recesses (102) and pressure relief openings (103) are formed on the side of the pressure relief rack (11) facing a first direction, and the accommodating recesses (102) are used for mounting busbars (13); and a protective cover (12) in which a material channel (104) is formed, wherein the protective cover (12) covers the pressure relief openings (103), such that the material channel (104) is communicated with the pressure relief openings (103) and the protective cover (12) isolates the pressure relief openings (103) from the accommodating recesses (102), and a hot material ejected from the pressure relief openings (103) is discharged into the material channel (104).

Description

A pressure relief bracket assembly and battery module

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 13, 2023, with application number 2023234043866. The entire contents of the above application are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a pressure relief bracket assembly and a battery module. Background Art

[0003] With the rapid development of new energy technologies, battery modules have been widely used in various new energy vehicles and energy storage power stations. Battery modules usually include multiple battery cells, which are electrically connected through a bus installed on a CCS bracket. During the use of the battery module, if short circuits, overcharges, etc. occur, a large amount of heat will accumulate inside the battery cells, resulting in thermal runaway. Thermal runaway will cause the internal pressure of the battery cells to be too high, causing fire or even explosion. Technical issues

[0004] Related technologies generally use a pressure relief vent on the CCS bracket to release the pressure generated by thermal runaway. However, this method will cause hot substances ejected from the pressure relief vent, such as electrolyte, to scatter on the bus, thereby causing the thermal runaway of the battery module to spread, causing an explosion and posing a safety hazard. Technical Solutions

[0005] In a first aspect, the present application provides a pressure relief bracket assembly, which includes: a pressure relief bracket, wherein a accommodating groove and a pressure relief port are formed on one side of the pressure relief bracket facing the first direction, and the accommodating groove is used to install a bus; a protective cover, which forms a material channel, and the protective cover is arranged on the pressure relief port so that the material channel is connected to the pressure relief port and the protective cover isolates the pressure relief port and the accommodating groove.

[0006] In a second aspect, the present application provides a battery module, which includes a plurality of battery cells and a pressure relief bracket assembly. A bus is provided in the receiving groove, and the bus is electrically connected to the plurality of battery cells respectively. Beneficial effects

[0007] The beneficial effects of a pressure relief bracket assembly and a battery module provided by the present application are as follows: the pressure relief bracket assembly includes: a pressure relief bracket, a side of the pressure relief bracket facing the first direction is formed with a accommodating groove and a pressure relief port, the accommodating groove is used to install a bus; a protective cover, a material channel is formed, the protective cover is arranged on the pressure relief port, so that the material channel is connected with the pressure relief port and the protective cover isolates the pressure relief port and the accommodating groove, so that when a thermal runaway phenomenon occurs in a battery cell, the pressure generated by the thermal runaway phenomenon is released through the pressure relief port, and at the same time, the hot material ejected from the pressure relief port is discharged into the material channel, and due to the isolation effect of the protective cover on the pressure relief port and the accommodating groove, the hot material ejected from the pressure relief port is prevented from scattering on the bus, thereby avoiding the spread of thermal runaway of the battery module and explosion, thereby reducing safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] FIG1 is a schematic diagram of the three-dimensional structure of a battery module embodiment provided by the present application;

[0009] FIG2 is a schematic diagram of the exploded structure of the battery module in FIG1 ;

[0010] FIG3 is a schematic cross-sectional view of the battery module in FIG1 with the FF direction upward;

[0011] FIG4 is a schematic diagram of the three-dimensional structure of the pressure relief bracket assembly in FIG2;

[0012] FIG5 is a schematic diagram of the exploded structure of the pressure relief bracket assembly in FIG4;

[0013] FIG6 is a cross-sectional schematic diagram of the pressure relief bracket assembly in FIG3;

[0014] FIG7 is a schematic cross-sectional view of the housing in FIG3 . Modes for Carrying Out the Invention

[0015] Please refer to Figures 1 and 2 together. Figure 1 is a three-dimensional structural diagram of an embodiment of a battery module 10 provided in this application, and Figure 2 is a schematic diagram of the exploded structure of the battery module 10 in Figure 1. The battery module 10 in this embodiment includes multiple battery cells 10a and a pressure relief bracket assembly 10b.

[0016] Please refer to Figures 3, 4, 5 and 6 together. Figure 3 is a cross-sectional schematic diagram of the battery module 10 in Figure 1 with the FF upward, Figure 4 is a three-dimensional structural schematic diagram of the pressure relief bracket assembly 10b in Figure 2, Figure 5 is a decomposed structural schematic diagram of the pressure relief bracket assembly 10b in Figure 4, and Figure 6 is a cross-sectional schematic diagram of the pressure relief bracket assembly 10b in Figure 3. The pressure relief bracket assembly 10b includes a pressure relief bracket 11 and a protective cover 12.

[0017] Among them, a accommodating groove 102 and a pressure relief port 103 are formed on the side of the pressure relief bracket 11 facing the first direction A. The accommodating groove 102 is used to install a bus 13, and the bus 13 is electrically connected to multiple battery cells 10a respectively. It can be understood that the number of accommodating grooves 102 and buses 13 can be set according to actual needs and there is no limitation on this.

[0018] The protective cover 12 is formed with a material channel 104, and the protective cover 12 is arranged to cover the pressure relief port 103, so that the material channel 104 is connected to the pressure relief port 103 and the protective cover 12 isolates the pressure relief port 103 and the accommodating tank 102, so that when the battery cell 10a has a thermal runaway phenomenon, the pressure generated by the thermal runaway phenomenon is released through the pressure relief port 103. At the same time, the hot material ejected from the pressure relief port 103 is discharged into the material channel 104, and due to the isolation effect of the protective cover 12 on the pressure relief port 103 and the accommodating tank 102, the hot material ejected from the pressure relief port 103 is prevented from scattering on the bus 13, thereby avoiding the spread of thermal runaway of the battery module 10 and the explosion, thereby reducing safety hazards.

[0019] Among them, the material channel 104 extends along the second direction B, and the second direction B is arranged to intersect with the first direction A. In this embodiment, the second direction B and the first direction A are perpendicular to each other. The end of the protective cover 12 in the second direction B is also formed with a material release port 105 connected to the material channel 104, so that the hot material discharged from the pressure relief port 103 into the material channel 104 is discharged through the material release port 105, avoiding the accumulation of hot material in the material channel 104. The material release port 105 is formed on the side of the protective cover 12 facing the first direction A.

[0020] The protective cover 12 is also formed with an exhaust port 106 that is connected to the material channel 104. The exhaust port 106 is formed on the end of the protective cover 12 opposite to the material release port 105, so that when the battery cell 10a has a thermal runaway phenomenon, the high-temperature gas generated by the thermal runaway phenomenon is discharged from the pressure relief port 103 into the material channel 104, and then discharged through the exhaust port 106. That is, the protective cover 12 in this embodiment can not only discharge hot materials through the material release port 105 set at one end, but also discharge high-temperature gases through the exhaust port 106 set at the other end. During use, the battery module 10 is placed in the state shown in Figure 3. In this state, the material release port 105 is located at the bottom of the protective cover 12, and the exhaust port 106 is located at the top of the protective cover 12. When the battery cell 10a has a thermal runaway phenomenon, the hot material sprayed from the pressure relief port 103 to the material channel 104, such as the electrolyte, will flow along the material channel 104 to the material release port 105 at the bottom due to the action of gravity, while the high-temperature gas sprayed from the pressure relief port 103 to the material channel 104 will flow along the material channel 104 to the exhaust port 106 at the top.

[0021] The pressure relief bracket 11 in this embodiment is further formed with a harness channel 107 , and the protective cover 12 is further formed with a harness notch 108 connected to the harness channel 107 , so that the collection harness connected to the bus 13 is led out through the harness notch 108 and the harness channel 107 in sequence.

[0022] The pressure relief bracket 11 includes a bracket body 111 and a pressure relief body 112. The bracket body 111 is formed with a accommodating groove 102. The pressure relief body 112 includes a pressure relief portion 1121 and a partition 1122. The pressure relief portion 1121 is connected to the bracket body 11 and is formed with a pressure relief port 103. The partition 1122 is connected to the pressure relief portion 1121 and is spaced apart from the bracket body 111 to form a wiring harness channel 107. The protective cover 12 is covered on the pressure relief portion 1121 and the partition 1122 so that the wiring harness gap 108 is connected to the wiring harness channel 107. Through this arrangement, on the one hand, the collection wiring harness is led out through the wiring harness gap 108 and the wiring harness channel 107 in sequence. On the other hand, the collection wiring harness is separated from the material channel 104 by the partition 1122 to avoid damage to the collection wiring harness caused by hot materials.

[0023] 2 and 3 , the battery module 10 in this embodiment further includes a battery management unit 10 c , which is electrically connected to the bus 13 . In this embodiment, the battery management unit 10 c is electrically connected to the bus 13 via the aforementioned acquisition harness.

[0024] Among them, the battery management unit 10c is arranged on the side of the protective cover 12 away from the pressure relief bracket 11. Through this arrangement, the protective cover 12 isolates the battery management unit 10c from the pressure relief port 103, preventing hot substances ejected from the pressure relief port 103 from scattering on the battery management unit 10c, thereby avoiding the spread of thermal runaway of the battery module 10 and causing explosion, thereby reducing safety hazards.

[0025] The battery management unit 10c is arranged on the side of the protective cover 12 facing the first direction A, and as described above, the material release port 105 is arranged at the end of the protective cover 12 in the second direction B, so that the hot material is blocked by the protective cover 12 during the process of being ejected from the pressure relief port 103, and will not be directly ejected onto the battery management unit 10c through the material release port 105.

[0026] Please refer to Figures 2, 3 and 7 again. Figure 7 is a cross-sectional schematic diagram of the shell 10d in Figure 3. The battery module 10 in this embodiment also includes a shell 10d. The shell 10d is formed with a accommodating space 109 and a vent 110 connected to the accommodating space 109. The pressure relief bracket assembly 10b is arranged in the accommodating space 109. The vent 110 is installed with an explosion-proof valve 115 so that when the battery cell 10a experiences thermal runaway, the high-temperature gas generated by the thermal runaway phenomenon is discharged into the accommodating space 109 through the exhaust port 106, and then discharged when the explosion-proof valve 115 is opened.

[0027] In which, the shell 10d includes an upper shell 113 and a lower shell 114, the upper shell 113 forms a first sub-space 1091, and the lower shell 114 forms a second sub-space 1092. The first sub-space 1091 and the second sub-space 1092 together form an accommodating space 109, the air vent 110 is formed in the upper shell 113 and communicates with the first sub-space 1091, and the pressure relief bracket assembly 10b is arranged in the second sub-space 1092.

Claims

1. A pressure relief bracket assembly, comprising: A pressure relief bracket, wherein a receiving groove and a pressure relief port are formed on one side of the pressure relief bracket facing the first direction, and the receiving groove is used for installing a busbar; A protective cover is formed with a material channel, and the protective cover is arranged on the pressure relief port so that the material channel is communicated with the pressure relief port and the protective cover isolates the pressure relief port and the accommodating groove.

2. The pressure relief bracket assembly according to claim 1, wherein: The material channel is extended along a second direction, the second direction is arranged to intersect with the first direction, and a material release port communicating with the material channel is formed at an end of the protective cover in the second direction.

3. The pressure relief bracket assembly according to claim 2, wherein: The substance release port is formed on one side of the protective cover facing the first direction.

4. The pressure relief bracket assembly according to claim 2, wherein: The protective cover is also formed with an exhaust port communicated with the material channel, and the exhaust port is formed at an end of the protective cover opposite to the material release port.

5. The pressure relief bracket assembly according to claim 1, wherein: The pressure relief bracket is also formed with a wiring harness channel, and the protective cover is also formed with a wiring harness notch connected to the wiring harness channel.

6. The pressure relief bracket assembly according to claim 5, wherein: The pressure relief bracket includes a bracket body and a pressure relief body, the bracket body is formed with the battery accommodating space and the accommodating groove, the pressure relief body includes a pressure relief portion and a partition portion, the pressure relief portion is connected to the bracket body and is formed with the pressure relief port, the partition portion is connected to the pressure relief portion and is spaced apart from the bracket body to form the wiring harness channel, and the protective cover is provided on the pressure relief portion and the partition portion so that the wiring harness notch is connected to the wiring harness channel.

7. A battery module, comprising a plurality of battery cells and the pressure relief bracket assembly according to any one of claims 1 to 6, wherein the busbar is provided in the receiving groove, and the busbar is electrically connected to the plurality of battery cells respectively.

8. The battery module according to claim 7, further comprising a battery management unit, wherein the battery management unit is electrically connected to the bus bar and is disposed on a side of the protective cover away from the pressure relief bracket.

9. The battery module according to claim 7, further comprising a shell, wherein the shell is formed with a containing space and a vent hole communicating with the containing space, the pressure relief bracket assembly is disposed in the containing space, and the vent hole is installed with an explosion-proof valve.

10. The battery module according to claim 9, wherein: The shell includes an upper shell and a lower shell, the upper shell forms a first sub-space, the lower shell forms a second sub-space, the first sub-space and the second sub-space together form the accommodating space, the air vent is formed in the upper shell and communicates with the first sub-space, and the pressure relief bracket assembly is arranged in the second sub-space.

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