Combustible gas absorption assembly and battery pack

Abstract

The utility model provides a combustible gas absorption assembly and a battery pack. The combustible gas absorption assembly comprises a fixed support plate and a plurality of absorption tanks. The fixed support plate is used for covering the end side of the battery cell fixing bracket, a plurality of tank body mounting holes are formed in the fixed support plate, and each tank body mounting hole is aligned with the end side of the corresponding cylindrical battery cell. Each absorption tank is arranged in the corresponding tank body mounting hole, and a reaction medium filling cavity is formed in each absorption tank. When thermal runaway occurs, combustible gas can be released from the end side of the cylindrical battery cell, so that the combustible gas can quickly and timely contact and penetrate through the reaction medium filling cavity of the absorption tank, and the combustible gas in the thermal runaway gas can be fully contacted with the porous reaction medium to perform adsorption reaction; therefore, the concentration of combustible gas in the thermal runaway gas can be efficiently reduced, so that the possibility of violent explosion of the battery pack is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the field of battery packs, in particular to a combustible gas absorption component and a battery pack. Background Art

[0002] With the rapid popularization of new energy batteries, the safety of new energy battery packs has also received people's attention. This is because when the battery module is in use or charging, many battery cells will continuously generate heat and cause high temperature pressure inside the battery module, or the battery cells may be squeezed, punctured, short-circuited or damaged by other external forces, which may lead to thermal runaway of the battery cells, causing the thermal runaway to spread from one battery cell to multiple battery cells, thereby generating more thermal runaway gases.

[0003] The main flammable gas components (such as CO and H2) in the known thermal runaway gas are the main factors that cause the thermal runaway gas to continue to spread and damage between multiple battery cells. When the concentration of the flammable gas inside the battery pack accumulates to the explosion limit, it will cause the battery pack to explode rapidly. In order to prevent the possible flammable gas from continuing to spread and damage inside the battery pack, it is necessary to reduce the concentration of the flammable gas, thereby reducing the explosion risk of the battery pack. Prior art such as application number CN116995341A proposes a battery module with a flame retardant structure, including: a battery rack, a plurality of battery cells and a phase change material column. The battery cell is arranged in the battery cell accommodating hole of the battery rack, and the phase change material column is arranged in the phase change material accommodating hole of the battery rack. The boiling point of the phase change material of the phase change material column is higher than the maximum operating temperature of the battery cell and lower than the auto-ignition temperature of the battery cell. The gaseous phase change material is non-flammable. Since the non-flammable gaseous phase change material will push the combustible gas and the combustion-supporting gas away from the abnormally high temperature battery cell, the battery cell will not catch fire and avoid a violent combustion reaction.

[0004] However, the design of the battery module with a flame retardant structure has the following problems:

[0005] Since the phase change material of the battery module in the prior art is arranged on the bracket between the installation positions of two adjacent battery cells, when the battery cell has thermal runaway, the combustible gas will be mainly released from both ends of the battery cell. At this time, the phase change material is converted into non-flammable gaseous phase change material and the gaseous phase change material pushes the combustible gas away from the high-temperature battery cell for a long time, resulting in poor responsiveness of the phase change material and failure to quickly reduce the concentration of the combustible gas, thereby failing to quickly reduce the risk of a violent explosion of the battery pack or delay the threshold required for the battery pack to cause a violent explosion. Utility Model Content

[0006] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a combustible gas absorption component which can effectively reduce the concentration of combustible gas.

[0007] The purpose of this utility model is achieved through the following technical solutions:

[0008] A combustible gas absorption component, comprising:

[0009] A fixed support plate, the fixed support plate is used to cover the end side of the battery cell fixing bracket, the fixed support plate is provided with a plurality of tank body mounting holes, each of the tank body mounting holes is aligned with the end side of the corresponding cylindrical battery cell;

[0010] A plurality of absorption tanks are provided, each of which is arranged in a corresponding mounting hole of the tank body, and a reaction medium filling cavity is formed in each of the absorption tanks.

[0011] In one embodiment, the fixing support plate is glued to the battery cell fixing bracket; and / or,

[0012] The fixed support plate is screwed to the battery cell fixing bracket.

[0013] In one embodiment, each of the absorption tanks is snap-connected to the corresponding tank body mounting hole; and / or,

[0014] Each of the absorption tanks is interference-connected with the corresponding tank body mounting hole.

[0015] In one embodiment, each of the absorption tanks is a plastic absorption tank.

[0016] In one embodiment, each of the absorption tanks is cylindrical, conical or truncated cone in shape.

[0017] A battery pack, comprising any of the above-mentioned combustible gas absorption components, the battery pack also comprising a fixing component and a plurality of cylindrical cells;

[0018] The fixing assembly includes a battery cell fixing bracket and a fuse plate. The battery cell fixing bracket is provided with a plurality of placement grooves. Each cylindrical battery cell is arranged in a corresponding placement groove. A bare hole is provided at the bottom of each placement groove. The fuse plate cover is arranged at one end of each bare hole away from the cylindrical battery cell.

[0019] In one embodiment, the number of the battery cell fixing brackets is two, namely a first battery cell fixing bracket and a second battery cell fixing bracket, the first battery cell fixing bracket is provided with a plurality of first placement grooves, each of which has a first bare hole at the bottom, the second battery cell fixing bracket is provided with a plurality of second placement grooves, each of which has a second bare hole at the bottom, and both ends of each cylindrical battery cell are respectively installed in the corresponding first placement groove and the second placement groove;

[0020] The number of the fuse plates is two, namely a first fuse plate and a second fuse plate. The first fuse plate cover is disposed in the plurality of the first placement grooves, and the second fuse plate cover is disposed in the plurality of the second placement grooves.

[0021] In one embodiment, the first battery cell fixing bracket is detachably connected to the second battery cell fixing bracket.

[0022] In one embodiment, the first fuse plate cover is disposed at one end of each of the first bare holes away from the cylindrical battery cell, and the second fuse plate cover is disposed at one end of each of the second bare holes away from the cylindrical battery cell.

[0023] In one of the embodiments, the battery pack further includes a plurality of top guide plates and a plurality of bottom guide plates, each of the top guide plates respectively abuts against one end of the plurality of cylindrical battery cells, and each of the bottom guide plates respectively abuts against the other end of the plurality of cylindrical battery cells; and / or, the fuse plate is a fiber fuse plate.

[0024] Compared with the prior art, the utility model has at least the following advantages:

[0025] Since a reaction medium filling cavity is formed in each absorption tank, the reaction medium filling cavity can be filled with porous reaction medium, each absorption tank is arranged in the corresponding tank body mounting hole, the fixed support plate cover is arranged on the end side of the battery cell fixing bracket, and the tank body mounting hole is aligned with the end side of the corresponding cylindrical battery cell, so that each absorption tank can also be aligned with the end side of the corresponding cylindrical battery cell. When the battery pack has thermal runaway, the combustible gas will be released from the end side of the cylindrical battery cell, so that the combustible gas can quickly and timely contact and penetrate the reaction medium filling cavity of the absorption tank, so that the combustible gas in the thermal runaway gas can fully contact with the porous reaction medium and undergo adsorption reaction, thereby effectively reducing the concentration of the combustible gas in the thermal runaway gas, thereby effectively reducing the possibility of a violent explosion of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 This is a schematic structural diagram of a combustible gas absorption assembly in one embodiment;

[0028] Figure 2 for Figure 1A semi-sectional schematic diagram showing the snap connection between the absorption tank of the combustible gas absorption assembly and the fixed support plate;

[0029] Figure 3 is a schematic structural diagram of a battery pack in another embodiment;

[0030] Figure 4 for Figure 3 A schematic diagram of an exploded structure of a first battery cell fixing bracket and a second battery cell fixing bracket of the battery pack shown;

[0031] Figure 5 for Figure 3 The structural explosion diagram of the battery pack shown;

[0032] Figure 6 for Figure 3 Schematic diagram of the structural explosion of the battery pack shown. DETAILED DESCRIPTION

[0033] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings. The drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0034] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0036] The present disclosure provides a combustible gas absorption assembly, comprising a fixed support and a plurality of absorption tanks. The fixed support plate is used to cover the end side of the battery cell fixed support, and the fixed support plate is provided with a plurality of tank body mounting holes, each of which is aligned with the end side of the corresponding cylindrical battery cell. Each of the absorption tanks is arranged in the corresponding tank body mounting hole, and a reaction medium filling cavity is formed in each of the absorption tanks.

[0037] See also Figure 1 to Figure 2 In order to better understand the combustible gas absorption assembly 10 of the present application, the combustible gas absorption assembly 10 is further explained below:

[0038] A combustible gas absorption assembly 10 of one embodiment includes a fixed support plate 100 and a plurality of absorption tanks 200. The fixed support plate 100 is used to cover the end side of the battery cell fixing bracket, and the fixed support plate 100 is provided with a plurality of tank body mounting holes 101, each of which is aligned with the end side of the corresponding cylindrical battery cell. Each of the absorption tanks 200 is disposed in the corresponding tank body mounting hole 101, and a reaction medium filling cavity 201 is formed in each of the absorption tanks 200.

[0039] In the present embodiment, since a reaction medium filling cavity 201 is formed in each absorption tank 200, the reaction medium filling cavity 201 can be filled with a porous reaction medium, and each absorption tank 200 is arranged in the corresponding tank body mounting hole 101, and the fixed support plate 100 covers the end side of the battery cell fixing bracket, and the tank body mounting hole 101 is aligned with the end side of the corresponding cylindrical battery cell, so that each absorption tank 200 can also be aligned with the end side of the corresponding cylindrical battery cell. When the battery pack has thermal runaway, the combustible gas will be released from the end side of the cylindrical battery cell, so that the combustible gas can quickly and timely contact and penetrate the reaction medium filling cavity 201 of the absorption tank 200, so that the combustible gas in the thermal runaway gas can fully contact with the porous reaction medium and undergo an adsorption reaction, thereby being able to efficiently reduce the concentration of the combustible gas in the thermal runaway gas, thereby effectively reducing the possibility of a violent explosion of the battery pack.

[0040] It should be noted that the porous reaction medium can be graphene, graphene sprayed with precious metal platinum, CoO, SnO2 or PtO, so that the porous reaction medium can reliably adsorb and react with combustible gas components in the runaway gas under high temperature conditions, such as H2 and CO in cylindrical lithium batteries. The porous reaction medium can adsorb H2 and simultaneously reduce CO to non-flammable CO2 gas, thereby effectively reducing the concentration of combustible gas in the thermal runaway gas, thereby effectively reducing the possibility of a violent explosion of the battery pack during thermal runaway, thereby improving the safety performance of the battery pack and delaying the threshold required for the battery pack to cause an explosion, thereby gaining more time for humans to take solutions when the battery pack thermally runs away.

[0041] like Figure 1 As shown, in one embodiment, the fixing support plate 100 is glued to the battery cell fixing bracket, so that the fixing support plate 100 is reliably fixed to the battery cell fixing bracket. In this embodiment, the fixing support plate 100 and the battery cell fixing bracket are fixed by bonding with liquid glue.

[0042] It is understood that in other embodiments, the fixing support plate 100 is not limited to being glued to the battery cell fixing bracket. For example, in one embodiment, the fixing support plate 100 is screwed to the battery cell fixing bracket.

[0043] like Figure 1 and Figure 2 As shown, in one of the embodiments, each absorption tank 200 is snap-connected with the corresponding tank body mounting hole 101 , so that each absorption tank 101 can be reliably fixed in the corresponding tank body mounting hole 101 .

[0044] It is understood that in other embodiments, each absorption tank 200 is not limited to being snap-fitted with the corresponding tank body mounting hole 101. For example, in this embodiment, each absorption tank 200 is interference-fitted with the corresponding tank body mounting hole 101.

[0045] In one embodiment, each of the absorption tanks 200 is a plastic absorption tank 200. It is understandable that whether each absorption tank 200 is connected to the corresponding tank body mounting hole 101 by a snap connection or an interference connection, the convenience of installation and removal of the absorption tank 200 can be effectively improved. Because the thermal runaway gas is in a high temperature and high pressure state when released from the end side of the cylindrical battery cell, the thermal runaway gas can easily penetrate the thin wall of one side of the plastic absorption tank 200 and enter the reaction medium filling cavity 201. In this way, the use of the plastic absorption tank 200 can effectively improve the responsiveness of the absorption tank 200.

[0046] like Figure 1 and Figure 2 As shown, in one embodiment, the shape of each absorption tank 200 is cylindrical, conical or truncated cone. In this embodiment, the shape of each absorption tank 200 is cylindrical. It can be understood that due to the limitations of the space and structural design of the battery pack, corresponding structural changes need to be made to the fixed support plate 100 and the tank body mounting hole 101 during the actual production process, and the different shapes of the absorption tank 200 can effectively improve the adaptability of the absorption tank 200.

[0047] See also Figures 3 to 6 The present application also provides a battery pack 20, comprising the combustible gas absorption assembly 10 described in any of the above embodiments, and the battery pack 20 further comprises a fixing assembly 400 and a plurality of cylindrical cells 300. The fixing assembly 400 comprises a cell fixing bracket 410 and a fuse plate 420, the cell fixing bracket 410 is provided with a plurality of placement grooves 4101, each of the cylindrical cells 300 is arranged in a corresponding placement groove 4101, a bare hole 4102 is provided at the bottom of each of the placement grooves 4101, and the fuse plate 420 is covered at one end of each of the bare holes 4102 away from the cylindrical cells 300.

[0048] In the present embodiment, since a reaction medium filling cavity 201 is formed in each absorption tank 200, the reaction medium filling cavity 201 can be filled with a porous reaction medium, each absorption tank 200 is arranged in the corresponding tank body mounting hole 101, and the fixed support plate 100 covers the end side of the battery cell fixing bracket 410, and the tank body mounting hole 101 is aligned with the end side of the corresponding cylindrical battery cell 300, so that each absorption tank 200 can also be aligned with the end side of the corresponding cylindrical battery cell 300. When the battery pack 20 has a thermal runaway, the combustible gas will be released from the end side of the cylindrical battery cell 300, so that the combustible gas can quickly and timely contact and penetrate the reaction medium filling cavity 201 of the absorption tank 200, so that the combustible gas in the thermal runaway gas can fully contact with the porous reaction medium and undergo an adsorption reaction, thereby being able to efficiently reduce the concentration of the combustible gas in the thermal runaway gas, thereby effectively reducing the possibility of a violent explosion of the battery pack 20.

[0049] like Figures 3 to 6 As shown, in one embodiment, the number of the battery cell fixing bracket 410 is two, namely the first battery cell fixing bracket 410a and the second battery cell fixing bracket 410b, the first battery cell fixing bracket 410a is provided with a plurality of first placement grooves 4101a, and the bottom of each of the first placement grooves 4101a is provided with a first bare hole 4102a, the second battery cell fixing bracket 410b is provided with a plurality of second placement grooves 4101b, and the bottom of each of the second placement grooves 4101b is provided with a second bare hole 4102b. The two ends of each cylindrical battery cell 300 are respectively installed in the corresponding first placement groove 4101a and the second placement groove 4101b. The number of the fuse plates 420 is two, namely the first fuse plate 420a and the second fuse plate 420b, the first fuse plate 420a is covered on the plurality of first placement grooves 4101a, and the second fuse plate 420b is covered on the plurality of second placement grooves 4101b.

[0050] In one embodiment, the first battery cell fixing bracket 410a and the second battery cell fixing bracket 410b are detachably connected. Furthermore, one end of the first battery cell fixing bracket 410a is connected to one end of the second battery cell fixing bracket 410b by bolt locking. In this embodiment, one end of the first battery cell fixing bracket 410a is formed with a plurality of first connecting columns with internal threaded holes, and one end of the second battery cell fixing bracket 410b is formed with a plurality of second connecting columns with countersunk holes. One end of each screw is inserted into the internal threaded hole of the corresponding first connecting column, and the other end of the screw is inserted into the countersunk hole of the corresponding second connecting column, so that one end of the first battery cell fixing bracket 410a and one end of the second battery cell fixing bracket 410b can be connected by screw locking, which can effectively improve the connection stability of the first battery cell fixing bracket 410a and the second battery cell fixing bracket 410b. At the same time, it can effectively ensure the installation stability of installing the two ends of each cylindrical battery cell 300 in the corresponding first placement groove 4101a and the corresponding second placement groove 4101b. Since the first fuse plate 420a and the second fuse plate 420b have a constant temperature effect, by covering the first fuse plate 420a on the plurality of the first placement grooves 4101a and the second fuse plate 420b on the plurality of the second placement grooves 4101b, the temperature difference between the inside and outside of the battery pack 20 is small, so that the problem of abnormally high temperature of the battery pack 20 will not occur, which can effectively improve the safety of the battery pack 20. By opening the first bare hole 4102a at the bottom of the first placement groove 4101a and the second bare hole 4102b at the bottom of the second placement groove 4101b, the distance that the thermal runaway gas is released from both ends of the cylindrical battery cell 300 and then filled into the plastic absorption tank 200 can be effectively reduced, which can effectively improve the responsiveness of the plastic absorption tank 200.

[0051] It should be noted that the constant temperature effect of the first fuse plate 420a and the second fuse plate 420b belongs to the scope of the prior art.

[0052] like Figure 5 and Figure 6As shown, in one embodiment, the first fuse plate 420a is covered at one end of each of the first bare holes 4102a away from the cylindrical battery cell 300, and the second fuse plate 420b is covered at one end of each of the second bare holes 4102b away from the cylindrical battery cell 300. In one embodiment, the battery pack 20 further includes a plurality of top guide plates 500 and a plurality of bottom guide plates 600, each of the top guide plates 500 is respectively abutted against one end of the plurality of cylindrical battery cells 300, and each of the bottom guide plates 600 is respectively abutted against the other end of the plurality of cylindrical battery cells 300; and / or, each of the fuse plates 420 is a fiber fuse plate 420. It can be understood that by abutting each top guide plate 500 against one end of the plurality of cylindrical cells 300, and each bottom guide plate 600 against the other end of the plurality of cylindrical cells 300, the corresponding cylindrical cells 300 can be connected in series in an orderly manner, thereby ensuring the normal operation of the entire battery pack 20. By covering the first fuse plate 420a at one end of each first bare hole 4102a away from the cylindrical cell 300, and the second fuse plate 420b at one end of each second bare hole 4102b away from the cylindrical cell 300, and the fuse plates 420 are all fiber fuse plates 420, the good insulation effect of the fiber fuse plates 420 can effectively prevent the occurrence of leakage or short circuit of the plurality of top guide plates 500 and the plurality of bottom guide plates 600, thereby effectively improving the safety of the battery pack 20.

[0053] Compared with the prior art, the utility model has at least the following advantages:

[0054] Since a reaction medium filling cavity is formed in each absorption tank, the reaction medium filling cavity can be filled with porous reaction medium, each absorption tank is arranged in the corresponding tank body mounting hole, the fixed support plate cover is arranged on the end side of the battery cell fixing bracket, and the tank body mounting hole is aligned with the end side of the corresponding cylindrical battery cell, so that each absorption tank can also be aligned with the end side of the corresponding cylindrical battery cell. When the battery pack has thermal runaway, the combustible gas will be released from the end side of the cylindrical battery cell, so that the combustible gas can quickly and timely contact and penetrate the reaction medium filling cavity of the absorption tank, so that the combustible gas in the thermal runaway gas can fully contact with the porous reaction medium and undergo adsorption reaction, thereby effectively reducing the concentration of the combustible gas in the thermal runaway gas, thereby effectively reducing the possibility of a violent explosion of the battery pack.

[0055] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A combustible gas absorption component, characterized in that: include: A fixed support plate, the fixed support plate is used to cover the end side of the battery cell fixing bracket, the fixed support plate is provided with a plurality of tank body mounting holes, each of the tank body mounting holes is aligned with the end side of the corresponding cylindrical battery cell; A plurality of absorption tanks are provided, each of which is arranged in a corresponding mounting hole of the tank body, and a reaction medium filling cavity is formed in each of the absorption tanks.

2. The combustible gas absorption assembly according to claim 1, characterized in that: The fixing support plate is glued to the battery cell fixing bracket; and / or, The fixed support plate is screwed to the battery cell fixing bracket.

3. The combustible gas absorption assembly according to claim 1, characterized in that: Each of the absorption tanks is snap-connected to the corresponding tank body mounting hole; and / or, Each of the absorption tanks is interference-connected with the corresponding tank body mounting hole.

4. The combustible gas absorption assembly according to claim 1, characterized in that: Each of the absorption tanks is a plastic absorption tank.

5. The combustible gas absorption assembly according to claim 1, characterized in that: Each of the absorption tanks is cylindrical, conical or truncated cone in shape.

6. A battery pack, characterized in that: The combustible gas absorption assembly according to any one of claims 1 to 5, wherein the battery pack further comprises a fixing assembly and a plurality of cylindrical cells; The fixing assembly includes a battery cell fixing bracket and a fuse plate. The battery cell fixing bracket is provided with a plurality of placement grooves. Each cylindrical battery cell is arranged in a corresponding placement groove. A bare hole is provided at the bottom of each placement groove. The fuse plate cover is arranged at one end of each bare hole away from the cylindrical battery cell.

7. The battery pack according to claim 6, characterized in that: The number of the battery cell fixing brackets is two, namely a first battery cell fixing bracket and a second battery cell fixing bracket. The first battery cell fixing bracket is provided with a plurality of first placement grooves, and a first bare hole is provided at the bottom of each of the first placement grooves. The second battery cell fixing bracket is provided with a plurality of second placement grooves, and a second bare hole is provided at the bottom of each of the second placement grooves. Both ends of each of the cylindrical battery cells are respectively installed in the corresponding first placement groove and the second placement groove. The number of the fuse plates is two, namely a first fuse plate and a second fuse plate. The first fuse plate cover is disposed in the plurality of the first placement grooves, and the second fuse plate cover is disposed in the plurality of the second placement grooves.

8. The battery pack according to claim 7, characterized in that: The first battery cell fixing bracket is detachably connected to the second battery cell fixing bracket.

9. The battery pack according to claim 7, characterized in that: The first fuse plate cover is disposed at one end of each of the first bare holes away from the cylindrical battery core, and the second fuse plate cover is disposed at one end of each of the second bare holes away from the cylindrical battery core.

10. The battery pack according to claim 9, characterized in that: The battery pack further includes a plurality of top guide plates and a plurality of bottom guide plates, each of the top guide plates respectively abuts against one end of the plurality of cylindrical battery cells, and each of the bottom guide plates respectively abuts against the other end of the plurality of cylindrical battery cells; and / or each of the fuse plates is a fiber fuse plate.

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