Battery cell exhaust assembly and battery pack

Abstract

The invention relates to the technical field of batteries, and discloses a battery cell exhaust assembly and a battery pack. The battery cell exhaust assembly comprises a base plate and a cover plate, an exhaust groove is formed in the side wall of the base plate, the exhaust groove comprises at least one main channel and a plurality of branch channels, the main channel extends in the length direction of the base plate, each main channel is communicated with the branch channels, each branch channel is of an arc-shaped structure, and the cover plate is arranged on the cover plate. Arc-shaped openings of the branch channels face the outlet direction of the main channel, the cover plate covers the side wall of the base plate, through holes corresponding to anti-explosion valves of the battery cells one to one are formed in the cover plate, and the through holes correspond to the branch channels one to one. According to the invention, the branch channels are arranged as the arc-shaped structures, and the arc-shaped openings face the outlet direction of the main channel, so that high-temperature inflammable gas entering the main channel unidirectionally circulates along the main channel, gas generated by thermal runaway of a battery cell can be guided to be quickly and orderly discharged, the gas is prevented from being accumulated in a battery pack, and the risk of fire or explosion is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly to a core exhaust assembly and a battery pack. Background Art

[0002] With the rapid development of electric vehicles, the power battery system has been continuously evolving. Currently, the design of battery packs is developing towards the direction of small volume and large capacity, and the energy density is continuously increasing. Correspondingly, the thermal safety requirements for battery packs are also increasing day by day.

[0003] In the prior art, the thermal runaway of the electric vehicle core is a serious safety hazard. If the thermal protection and exhaust form design inside the battery pack are unreasonable, it is extremely easy to cause the battery pack to catch fire or even explode during the thermal runaway of the core. Summary of the Invention

[0004] In view of this, the present invention provides a core exhaust assembly and a battery pack to solve the problem that the battery pack is extremely easy to catch fire or even explode during the thermal runaway of the core.

[0005] In a first aspect, the present invention provides a core exhaust assembly, including:

[0006] A substrate, on the side wall of which there is an exhaust groove, the exhaust groove includes at least one main channel and a plurality of branch channels, the main channel extends along the length direction of the substrate, each main channel is respectively communicated with a plurality of the branch channels, each branch channel is an arc structure, and the arc opening of the branch channel faces the outlet direction of the main channel;

[0007] A cover plate, covering the side wall of the substrate, and through holes for corresponding to the explosion-proof valves of the cores one by one are opened on the cover plate, and the through holes are correspondingly arranged with the branch channels one by one.

[0008] Beneficial effects: Taking the battery pack as an example, for this core exhaust assembly, when the core exhaust assembly is installed in the battery pack, first cover the cover plate on the battery module of the battery pack, so that the through holes on the cover plate are correspondingly arranged with the explosion-proof valves of each core in the battery module one by one, and then set the side wall of the substrate on the cover plate, so that each branch channel of the substrate is correspondingly communicated with the through hole of the cover plate one by one.

[0009] When a thermal runaway occurs in the battery cells within the battery pack, since the through-holes on the cover plate correspond one-to-one with the explosion-proof valves and the branch channels of the exhaust grooves of the battery cells, the high-temperature flammable gases generated by the thermal runaway of the battery cells can pass through the corresponding through-holes through the cover plate and enter the corresponding branch channels, and then enter the main channel from the branch channels, so that the high-temperature flammable gases are discharged along the main channel. Since the cover plate is arranged between the substrate and the battery module, the high-temperature flammable gases entering the exhaust groove are separated by the cover plate, preventing the high-temperature flammable gases discharged by a single battery cell from affecting other battery cells, and enabling point-to-point exhaust of a single battery cell, so that the influence of the exhaust of a single battery cell out of control on other battery cells is small, and the safety of the battery pack is improved.

[0010] In addition, since the branch channel is an arc-shaped structure and the arc opening faces the direction of the outlet of the main channel, the high-temperature flammable gases entering the main channel flow unidirectionally along the main channel, which is beneficial to guiding the high-temperature flammable gases generated by the thermal runaway of the battery cells to be discharged quickly and orderly, preventing the gases from accumulating in the battery pack, thereby reducing the risk of fire or explosion.

[0011] In an optional implementation manner, the arc center line of each of the branch channels is tangent to the center line of the corresponding main channel.

[0012] Beneficial effects: Since the arc center line of the branch channel is tangent to the center line of the corresponding main channel, the gas enters the main channel more smoothly from the branch channel, avoiding the gas entering the main channel from colliding with the inner wall of the main channel, reducing the exhaust resistance, and being able to effectively discharge the high-temperature flammable gases, further improving the exhaust efficiency. At the same time, it helps to ensure that the high-temperature flammable gases can flow unidirectionally along the main channel after entering the main channel, avoiding the gas from flowing back or being disordered in the exhaust channel, better realizing the control of the exhaust direction, reducing the residence time of the gas in the battery pack, and enhancing the stability and reliability of the exhaust.

[0013] In an optional implementation manner, each of the main channels is correspondingly provided with two groups of branch channel groups, and each group of branch channel groups includes at least two of the branch channels arranged at intervals along the length direction of the main channel, and the two groups of branch channel groups are respectively arranged on both sides of the main channel.

[0014] Beneficial effects: The two groups of branch channel groups are respectively located on both sides of the main channel, and a plurality of branch channels are arranged at intervals along the length direction of the main channel, which can enable the gases generated by the thermal runaway of the battery cells to enter the main channel more evenly from the branch channels, avoiding the situation of local poor exhaust or pressure concentration, thereby improving the balance of exhaust.

[0015] At the same time, multiple branch channels work simultaneously, which can increase the number of exhaust channels, further improve the exhaust efficiency, enable the high-temperature flammable gases to be quickly discharged from the battery pack, and reduce the risk of thermal runaway of the battery pack.

[0016] In an optional embodiment, the branch channels of the two groups of branch channel groups between two adjacent main channels are connected in a one-to-one correspondence.

[0017] Beneficial effect: When a battery cell generates a large amount of gas due to thermal runaway, the gas can be diverted between adjacent main channels through connected branch channels, avoiding excessive exhaust pressure in a single main channel and improving the flexibility and adaptability of the exhaust system.

[0018] At the same time, it can make the gas distribution in the exhaust channel more uniform, further improve the exhaust efficiency, ensure that high-temperature flammable gases can be discharged from the battery pack more quickly and thoroughly, reduce safety hazards caused by local exhaust problems, and improve the stability and reliability of the entire exhaust system.

[0019] In an optional embodiment, the exhaust grooves are symmetrically arranged with respect to a center line in a length direction of the substrate.

[0020] Beneficial effects: Symmetrically arranged exhaust slots can provide relatively balanced exhaust conditions for each battery cell, so that the gas is evenly stressed during the exhaust process, which helps maintain the stability of the exhaust system and avoid local exhaust problems, thereby improving the overall exhaust effect. At the same time, the symmetrical structure is more convenient during installation and maintenance, reducing installation errors and maintenance difficulties that may be caused by structural asymmetry.

[0021] In a second aspect, the present invention further provides a battery pack, comprising:

[0022] frame;

[0023] At least two battery modules are arranged in the frame, each of the battery modules includes a plurality of flatly arranged battery cells, and the plurality of battery cells have explosion-proof valves with one side forming an exhaust surface of the battery module and the other side forming a heat dissipation surface of the battery module;

[0024] A cooling plate, disposed between the heat dissipation surfaces of any two of the battery modules;

[0025] The battery cell exhaust assembly is arranged in a one-to-one correspondence with the battery module, the cover plate is covered on the exhaust surface, the through hole is arranged in a one-to-one correspondence with the explosion-proof valve, and the main channel is arranged in a one-to-one correspondence with the exhaust outlet of the battery pack.

[0026] Beneficial effects: In this battery pack, the cover plate is arranged on the exhaust surface of the battery module, so that the through hole on the cover plate is arranged one-to-one with the explosion-proof valve of each battery cell in the battery module, and then the side wall of the substrate is arranged on the cover plate, so that each branch channel of the substrate is connected to the through hole of the cover plate one-to-one. The cooling plate is arranged between the heat dissipation surfaces of the two battery modules.

[0027] When a thermal runaway occurs in the battery cells within the battery pack, the high-temperature and flammable gases generated by the thermal runaway of the battery cells can pass through the corresponding through-holes, penetrate the cover plate, enter the corresponding branch channels, and then enter the main channel from the branch channels, enabling the high-temperature and flammable gases to be discharged along the main channel. The high-temperature and flammable gases entering the exhaust groove are separated by the cover plate, preventing the high-temperature and flammable gases discharged from a single cell from affecting other cells, achieving point-to-point exhaust for a single cell, minimizing the impact of a single cell's out-of-control exhaust on other cells, and improving the safety of the battery pack.

[0028] At the same time, since multiple battery cells are arranged flatly and the heat dissipation surface of the battery module is in contact with the cooling plate, the contact area between the battery module and the cooling plate is increased, enabling more effective heat dissipation, ensuring the temperature stability of the battery cells during operation, and improving the battery performance and safety.

[0029] In addition, through reasonable layout, the battery module, the cooling plate, and the battery cell exhaust assembly are integrated within the frame, making the battery pack structure more compact and saving space.

[0030] In an alternative embodiment, it further includes a plurality of buffer members, each of which is clamped between the cover plate and the battery module, and a plurality of through-holes corresponding to the through-holes one by one are formed in each buffer member.

[0031] Beneficial effects: By arranging buffer members between the cover plate and the battery module, the impact of external vibrations on the battery cells can be effectively buffered, preventing the battery cells from being damaged due to vibrations, avoiding direct contact between the cover plate and the battery module, reducing the wear generated due to relative movement between the two, protecting the insulating film on the surface of the battery cells, preventing problems such as short circuits caused by the rupture of the insulating film, and extending the service life of the battery cells.

[0032] At the same time, the through-holes formed in the buffer members correspond to the through-holes of the cover plate one by one. Without affecting the discharge of gases during the thermal runaway of the battery cells, the sealing performance between the cover plate and the battery module can be ensured, preventing gas leakage.

[0033] In an alternative embodiment, it further includes a plurality of heat-conducting members, each of which is clamped between the cooling plate and the battery module.

[0034] Beneficial effects: By arranging heat-conducting members between the cooling plate and the battery module, the heat generated by the battery module during operation can be effectively conducted to the cooling plate, accelerating the heat dissipation, thereby better controlling the temperature of the battery cells, and improving the battery performance and safety. Through the uniform heat-conducting effect of the heat-conducting members, it helps to make the temperature distribution of each battery cell within the battery module more uniform, avoiding the occurrence of local overheating phenomena, and further improving the stability and reliability of the battery.

[0035] In addition, the heat-conducting member sandwiched between the cooling plate and the battery module can fill the possible tiny gaps between the two, reduce the thermal resistance, make heat transfer more efficient, and ensure that the battery module can dissipate heat quickly.

[0036] In an alternative embodiment, the battery cell includes a positive connection piece and a negative connection piece, and the positive connection piece and the negative connection piece are respectively disposed on opposite sides of the battery cell and are centrosymmetric with respect to the battery cell.

[0037] Beneficial effects: The positive connection piece and the negative connection piece are centrosymmetric with respect to the battery cell, and the positive connection piece of one battery cell can coincide with the negative connection piece of another battery cell with the same placement method. The positive connection piece and the negative connection piece of the battery cell are directly connected, eliminating connection components such as busbars. This can not only shorten the gap between battery cells but also reduce the overheating problem of the welding surface caused by the large resistance due to busbar welding. It is convenient for series or parallel connection between battery cells, reduces the complexity of the connection circuit, reduces the connection resistance, and improves the overall performance of the battery pack.

[0038] In an alternative embodiment, along the height direction of the battery pack, the battery cell exhaust assembly at the bottom is connected to the frame to form the lower housing of the battery pack, and the battery cell exhaust assembly at the top is connected to the frame to form the upper housing of the battery pack.

[0039] Beneficial effects: Combining the battery cell exhaust assembly with the frame to form the upper and lower housings of the battery pack makes the structure of the battery pack more compact and integrated, reduces the number of components, and improves the strength and stability of the overall structure. The design of the upper and lower housings can better protect the battery module and internal components, prevent damage to the battery pack caused by collision, extrusion, etc. by external objects, and improve the safety of the battery pack. At the same time, the design of the upper and lower housings is conducive to forming reasonable heat dissipation and exhaust grooves, ensuring that the battery pack can effectively dissipate heat and discharge the gas generated by thermal runaway during operation, and improving the performance and reliability of the battery pack. Description of the Drawings

[0040] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0041] Figure 1 It is an exploded view of a battery pack according to an embodiment of the present invention;

[0042] Figure 2 It is a structural diagram of a battery cell in a battery pack according to an embodiment of the present invention;

[0043] Figure 3 is the bottom view of Figure 2 ;

[0044] Figure 4 is a schematic structural diagram of a battery module in a battery pack according to an embodiment of the present invention;

[0045] Figure 5 is the bottom view of Figure 4 ;

[0046] Figure 6 is a schematic structural diagram of a cell exhaust assembly according to an embodiment of the present invention;

[0047] Figure 7 is a schematic structural diagram of a substrate in a cell exhaust assembly according to an embodiment of the present invention;

[0048] Figure 8 is a top view of a substrate in a cell exhaust assembly according to an embodiment of the present invention;

[0049] Figure 9 is a top view of a substrate in a cell exhaust assembly according to another embodiment of the present invention;

[0050] Figure 10 is an internal schematic diagram of a battery pack according to an embodiment of the present invention.

[0051] Explanation of reference numerals:

[0052] 1. Substrate; 101. Side wall; 102. Exhaust groove; 1021. Main channel; 1022. Branch channel group; 10221. Branch channel; 2. Cover plate; 201. Through hole; 3. Frame; 4. Battery module; 401. Cell; 4014. Positive connection piece; 4015. Negative connection piece; 402. Exhaust surface; 403. Heat dissipation surface; 6. Cooling plate; 7. Buffer member; 701. Through hole; 8. Electrical device. Detailed implementation manners

[0053] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0054] In the related art, the thermal runaway of the electric vehicle cell is a serious safety hazard. If the thermal protection and exhaust form design inside the battery pack are unreasonable, it is extremely easy to cause the battery pack to catch fire or even explode during the thermal runaway of the cell.

[0055] To solve the above technical problems, the embodiments of the present invention will be described below in conjunction with Figures 1 to 10 as shown, to describe the embodiments of the present invention.

[0056] According to an embodiment of the present invention, on the one hand, as Figures 1 to 10 shown, a venting assembly for a battery cell 401 is provided, which includes a substrate 1 and a cover plate 2.

[0057] Specifically, as Figures 7 to 9 shown, an exhaust groove 102 is provided on the side wall 101 of the substrate 1. The exhaust groove 102 includes a main channel 1021 and a branch channel 10221. Among them, there is at least one main channel 1021, and a plurality of branch channels 10221 are provided. The main channel 1021 extends along the length direction of the substrate 1, and each main channel 1021 is respectively communicated with a plurality of branch channels 10221. Each branch channel 10221 is an arc-shaped structure, and the arc-shaped opening of the branch channel 10221 faces the outlet direction of the main channel 1021.

[0058] Specifically, as Figure 6 and Figure 7 shown, the cover plate 2 is covered on the side wall 101 of the substrate 1. A plurality of through holes 201 are opened on the cover plate 2. The plurality of through holes 201 are arranged in one-to-one correspondence with the explosion-proof valves of the battery cell 401, and the through holes 201 are arranged in one-to-one correspondence with the branch channels 10221.

[0059] For this venting assembly of the battery cell 401, taking the battery pack as an example, when the venting assembly of the battery cell 401 is installed in the battery pack, first cover the cover plate 2 on the battery module 4 of the battery pack, so that the through holes 201 on the cover plate 2 are arranged in one-to-one correspondence with the explosion-proof valves of each battery cell 401 in the battery module 4, and then set the side wall 101 of the substrate 1 on the cover plate 2, so that each branch channel 10221 of the substrate 1 is in one-to-one correspondence and communication with the through holes 201 of the cover plate 2.

[0060] When a thermal runaway occurs in the battery cell 401 in the battery pack, since the through holes 201 on the cover plate 2 are in one-to-one correspondence with the explosion-proof valves of the battery cell 401 and the branch channels 10221 of the exhaust groove 102, the high-temperature flammable gas generated by the thermal runaway of the battery cell 401 can pass through the corresponding through holes 201, pass through the cover plate 2 and enter the corresponding branch channel 10221, and then enter the main channel 1021 from the branch channel 10221, so that the high-temperature flammable gas is discharged along the main channel 1021. Since the cover plate 2 is arranged between the substrate 1 and the battery module 4, the high-temperature flammable gas entering the exhaust groove 102 is separated by the cover plate 2, preventing the high-temperature flammable gas discharged by the runaway of a single battery cell 401 from affecting other battery cells 401, and enabling point-to-point venting of a single battery cell 401, so that the influence of the runaway venting of a single battery cell 401 on other battery cells 401 is small, and the safety of the battery pack is improved.

[0061] In addition, since the branch channel 10221 is an arc-shaped structure with the arc opening facing the outlet direction of the main channel 1021, the high-temperature flammable gas entering the main channel 1021 flows unidirectionally along the main channel 1021, which is conducive to guiding the high-temperature flammable gas generated by the thermal runaway of the battery cell 401 to be discharged quickly and orderly, preventing the gas from accumulating in the battery pack, and thus reducing the risk of fire or explosion.

[0062] Specifically, as Figures 7 to 9 shown, the arc opening of the branch channel 10221 facing the outlet direction of the main channel 1021 means that the concave side of the arc-shaped structure faces the outlet direction of the main channel 1021, so that the high-temperature flammable gas entering the main channel 1021 can flow towards the outlet direction of the main channel 1021.

[0063] Specifically, one main channel 1021 can be opened on the side wall 101, or multiple main channels 1021 can be opened at intervals. In the embodiment of the present application, the number of the main channels 1021 is not specifically limited.

[0064] Specifically, several branch channels 10221 can be evenly spaced to facilitate the corresponding connection between the branch channels 10221 and the through holes 201. In the embodiment of the present application, the distribution mode of several branch channels 10221 is not specifically limited.

[0065] Specifically, the shape and size of the cover plate 2 can be adapted to the shape and size of the substrate 1 to facilitate covering the cover plate 2 on the side wall 101 of the substrate 1.

[0066] Specifically, the through hole 201 can be set to any existing shape. Exemplarily, the through hole 201 can be a circular hole, a square hole, a rectangular hole, etc. In the embodiment of the present application, the shape of the through hole 201 is not specifically limited.

[0067] In one embodiment, as Figures 7 to 9 shown, the arc center line of each branch channel 10221 is tangent to the center line of the corresponding main channel 1021.

[0068] Since the arc center line of the branch channel 10221 is tangent to the center line of the corresponding main channel 1021, the gas enters the main channel 1021 more smoothly, avoiding the gas entering the main channel 1021 from colliding with the inner wall of the main channel 1021, reducing the exhaust resistance, and being able to effectively discharge the high-temperature flammable gas, further improving the exhaust efficiency. At the same time, it helps to ensure that the high-temperature flammable gas can flow unidirectionally along the main channel 1021 after entering the main channel 1021, avoiding the gas from flowing back or being disordered in the exhaust channel, better realizing the control of the exhaust direction, reducing the residence time of the gas in the battery pack, and enhancing the stability and reliability of the exhaust.

[0069] It should be noted that the arc center line of the branch channel 10221 refers to the arc exhaust path of the branch channel 10221.

[0070] In one embodiment, as Figures 7 to 9 shown, each main channel 1021 is correspondingly provided with two groups of branch channel groups 1022, and each group of branch channel groups 1022 includes at least two branch channels 10221 arranged at intervals along the length direction of the main channel 1021. The two groups of branch channel groups 1022 are respectively arranged on both sides of the main channel 1021.

[0071] The two groups of branch channel groups 1022 are respectively located on both sides of the main channel 1021, and a plurality of branch channels 10221 are arranged at intervals along the length direction of the main channel 1021, which can enable the gas generated by the thermal runaway of the battery cell 401 to enter the main channel 1021 more evenly from the branch channels 10221, avoiding the situation of local exhaust blockage or pressure concentration, thereby improving the balance of exhaust.

[0072] At the same time, when multiple branch channels 10221 work simultaneously, the number of exhaust channels can be increased, further improving the exhaust efficiency, enabling the high-temperature flammable gas to be quickly discharged from the battery pack, and reducing the thermal runaway risk of the battery pack.

[0073] Specifically, as Figures 7 to 9 shown, the two groups of branch channel groups 1022 can be symmetrically arranged with respect to the center line of the length direction of the substrate 1, or can be asymmetrically arranged. In the embodiments of the present application, the arrangement manner of the two groups of branch channel groups 1022 is not specifically limited.

[0074] In one embodiment, as Figures 7 to 9 shown, the branch channels 10221 of the two groups of branch channel groups 1022 between two adjacent main channels 1021 are arranged in one-to-one correspondence.

[0075] When the gas generated by the thermal runaway of a certain battery cell 401 is relatively large, the gas can be shunted between adjacent main channels 1021 through the connected branch channels 10221, avoiding excessive exhaust pressure on a single main channel 1021, and improving the flexibility and adaptability of the exhaust system.

[0076] At the same time, it can make the distribution of the gas in the exhaust channel more uniform, further improving the exhaust efficiency, ensuring that the high-temperature flammable gas can be discharged from the battery pack more quickly and completely, reducing the safety hazards caused by local exhaust blockage, and enhancing the stability and reliability of the entire exhaust system.

[0077] In one embodiment, as Figures 7 to 9 shown, the exhaust groove 102 is symmetrically arranged with respect to the center line of the length direction of the substrate 1.

[0078] The symmetrically arranged exhaust slots 102 can provide relatively balanced exhaust conditions for each battery cell 401, so that the gas is evenly stressed during the exhaust process, which helps to maintain the stability of the exhaust system and avoid local exhaust problems, thereby improving the overall exhaust effect. At the same time, the symmetrical structure is more convenient during installation and maintenance, reducing installation errors and maintenance difficulties that may be caused by structural asymmetry.

[0079] According to an embodiment of the present invention, on the other hand, Figures 1 to 10 As shown, a battery pack is also provided, including a frame 3, a battery module 4, a cooling plate 6 and a battery cell 401 exhaust assembly.

[0080] Specifically, Figures 1 to 5 As shown, at least two battery modules 4 are arranged in the frame 3, and each battery module 4 includes a plurality of battery cells 401, and the plurality of battery cells 401 are arranged flat, wherein one side of the plurality of battery cells 401 having an explosion-proof valve forms an exhaust surface 402 of the battery module 4, and the other side forms a heat dissipation surface 403 of the battery module 4.

[0081] Specifically, Figure 1 As shown, the cooling plate 6 is arranged between the heat dissipation surfaces 403 of any two battery modules 4 .

[0082] Specifically, Figure 1 As shown, the exhaust assembly of the battery cell 401 is arranged one-to-one with the battery module 4, the cover plate 2 is arranged on the exhaust surface 402, and the through hole 201 on the cover plate 2 is arranged one-to-one with the explosion-proof valve. The main channel 1021 is arranged one-to-one with the exhaust outlet of the battery pack.

[0083] In this battery pack, the cover plate 2 is placed on the exhaust surface 402 of the battery module 4, so that the through hole 201 on the cover plate 2 is arranged one-to-one with the explosion-proof valve of each battery cell 401 in the battery module 4, and then the side wall 101 of the substrate 1 is placed on the cover plate 2, so that each branch channel 10221 of the substrate 1 is connected to the through hole 201 of the cover plate 2 one-to-one. The cooling plate 6 is placed between the heat dissipation surfaces 403 of the two battery modules 4.

[0084] When a battery cell 401 in the battery pack experiences thermal runaway, the high-temperature flammable gas generated by the thermal runaway of the battery cell 401 can enter the corresponding branch channel 10221 through the corresponding through hole 201, through the cover plate 2, and then enter the main channel 1021 from the branch channel 10221, so that the high-temperature flammable gas is discharged along the main channel 1021. The high-temperature flammable gas entering the exhaust groove 102 is separated by the cover plate 2, preventing the high-temperature flammable gas discharged out of control from a single battery cell 401 from affecting other battery cells 401, and can achieve point-to-point exhaust of a single battery cell 401, so that the uncontrolled exhaust of a single battery cell 401 has less impact on other battery cells 401, thereby improving the safety of the battery pack.

[0085] Meanwhile, since multiple battery cells 401 are arranged in a flat manner, the heat dissipation surface 403 of the battery module 4 is in contact with the cooling plate 6, increasing the contact area between the battery module 4 and the cooling plate 6, enabling more effective heat dissipation, ensuring the temperature stability of the battery cells 401 during operation, and improving battery performance and safety.

[0086] In addition, through reasonable layout, the battery module 4, the cooling plate 6, and the exhaust assembly of the battery cells 401 are integrated within the frame 3, making the battery pack structure more compact and saving space.

[0087] Specifically, the battery cells 401 are arranged in a flat manner. An explosion-proof valve is arranged on one large surface side of the battery cells 401, and the other large surface is a flat surface.

[0088] Specifically, the number of battery modules 4 can be set to two, three, four, etc. In the embodiments of the present application, the number of battery modules 4 is not specifically limited. Exemplarily, two battery modules 4 are provided. A cooling plate 6 is arranged between the heat dissipation surfaces 403 of the two battery modules 4, and an exhaust assembly of the battery cells 401 is arranged on the exhaust surface 402 of each battery module 4.

[0089] In one embodiment, as Figure 1 shown, it further includes a plurality of buffer members 7. Each buffer member 7 is clamped between the cover plate 2 and the battery module 4. A plurality of through holes 701 are formed in each buffer member 7, and the through holes 701 are arranged in one-to-one correspondence with the through holes 201.

[0090] By arranging the buffer members 7 between the cover plate 2 and the battery module 4, the impact of external vibration on the battery cells 401 can be effectively buffered, preventing the battery cells 401 from being damaged due to vibration, avoiding direct contact between the cover plate 2 and the battery module 4, reducing the wear caused by relative movement between the two, protecting the insulating film on the surface of the battery cells 401, preventing problems such as short circuits caused by the rupture of the insulating film, and extending the service life of the battery cells 401.

[0091] Meanwhile, the through holes 701 formed in the buffer members 7 are arranged in one-to-one correspondence with the through holes 201 of the cover plate 2, which can ensure the sealing between the cover plate 2 and the battery module 4 without affecting the discharge of gas during thermal runaway of the battery cells 401 and prevent gas leakage.

[0092] Specifically, the buffer members 7 can be selected from buffer foams, elastic buffer members 7, etc. In the embodiments of the present application, the type of the buffer members 7 is not specifically limited.

[0093] In one embodiment, as Figure 1 shown, it further includes heat conducting members (as Figure 1 shown). Each heat conducting member is clamped between the cooling plate 6 and the battery module 4.

[0094] By providing a heat-conducting member between the cooling plate 6 and the battery module 4, the heat generated by the battery module 4 during operation can be effectively conducted to the cooling plate 6, accelerating heat dissipation, thereby better controlling the temperature of the battery cells 401 and improving the performance and safety of the battery. Through the uniform heat-conducting effect of the heat-conducting member, it helps to make the temperature distribution of each battery cell 401 in the battery module 4 more uniform, avoiding the occurrence of local overheating, and further improving the stability and reliability of the battery.

[0095] In addition, the heat-conducting member sandwiched between the cooling plate 6 and the battery module 4 can fill the possible tiny gaps between the two, reducing the thermal resistance and making heat transfer more efficient, ensuring that the battery module 4 can dissipate heat quickly.

[0096] Specifically, the heat-conducting member can be a heat-conducting gasket or a heat-conducting structural adhesive, etc. In the embodiments of the present application, the type of the heat-conducting member is not specifically limited.

[0097] In one embodiment, as Figure 2 and Figure 3 shown, the battery cell 401 includes a positive connection piece 4014 and a negative connection piece 4015. The positive connection piece 4014 and the negative connection piece 4015 are respectively arranged on opposite sides of the battery cell 401, and the positive connection piece 4014 and the negative connection piece 4015 are centrosymmetric about the battery cell 401.

[0098] The positive connection piece 4014 and the negative connection piece 4015 are centrosymmetric about the battery cell 401. The positive connection piece 4014 of the battery cell 401 can coincide with the negative connection piece 4015 of another battery cell 401 with the same placement method. The positive connection piece 4014 and the negative connection piece 4015 of the battery cell 401 are directly connected, eliminating connection components such as busbars. This can not only shorten the gap between the battery cells 401, but also reduce the overheating problem of the welding surface caused by the large resistance due to busbar welding. It is convenient for series or parallel connection between the battery cells 401, reducing the complexity of the connection lines, reducing the connection resistance, and improving the overall performance of the battery pack.

[0099] In one embodiment, as Figure 1 shown, along the height direction of the battery pack, the exhaust assembly of the bottom battery cell 401 is connected to the frame 3 to form the lower housing of the battery pack, and the exhaust assembly of the top battery cell 401 is connected to the frame 3 to form the upper housing of the battery pack.

[0100] Combining the exhaust component of the battery cell 401 with the frame 3 to form the upper and lower shells of the battery pack makes the structure of the battery pack more compact and integrated, reduces the number of components, and improves the strength and stability of the overall structure. The design of the upper and lower shells can better protect the battery module 4 and internal components, prevent damage to the battery pack caused by collision, extrusion, etc. of external objects, and improve the safety of the battery pack. At the same time, the design of the upper and lower shells is conducive to forming reasonable heat dissipation and exhaust grooves 102, ensuring that the battery pack can effectively dissipate heat and discharge the gas generated by thermal runaway during operation, and improving the performance and reliability of the battery pack.

[0101] Specifically, as Figure 1 and Figure 10 shown, there is also an electrical device 8 provided in the battery pack, and the electrical device 8 is used to detect or control the battery pack.

[0102] The heat dissipation and exhaust working principles of the battery pack in this embodiment are described as follows:

[0103] 1. Heat dissipation principle of the battery pack:

[0104] During the operation of the battery cell 401, heat is generated. Since the heat dissipation surface 403 of the battery module 4 is in direct contact with the cooling plate 6 and there is a heat conducting member sandwiched in between, the heat is quickly conducted to the cooling plate 6 through the heat conducting member. The cooling plate 6 exchanges heat with the battery module 4 to dissipate the heat, thereby realizing the heat dissipation of the battery module 4 and maintaining the battery module 4 within a suitable operating temperature range.

[0105] 2. Exhaust principle of the battery pack:

[0106] When the battery cell 401 undergoes thermal runaway, a large amount of high-temperature flammable gas will be generated. The gas enters the branch channel 10221 of the battery cell 401 exhaust component through the explosion-proof valve of the battery cell 401. Due to the arc-shaped structure of the branch channel 10221 and its reasonable design with the main channel 1021, the gas can smoothly enter the main channel 1021 from the branch channel 10221, enabling the gas entering the main channel 1021 to flow unidirectionally along the main channel 1021, which is conducive to guiding the gas generated by the thermal runaway of the battery cell 401 to be discharged quickly and orderly.

[0107] The main channel 1021 corresponds to the exhaust outlet of the battery pack one by one, and the gas finally discharges to the outside of the battery pack through the exhaust outlet of the battery pack, preventing the gas from accumulating inside the battery pack, thereby reducing the risk of fire or explosion.

[0108] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery core exhaust assembly, characterized in that: include: A substrate, a side wall of which is provided with an exhaust groove, wherein the exhaust groove includes at least one main channel and a plurality of branch channels, wherein the main channel extends along the length direction of the substrate, each of the main channels is respectively connected with a plurality of branch channels, each of the branch channels is an arc-shaped structure, and the arc-shaped opening of the branch channel faces the outlet direction of the main channel; A cover plate is arranged on the side wall of the substrate, and the cover plate is provided with through holes for being arranged in a one-to-one correspondence with the explosion-proof valves of the battery cells, and the through holes are arranged in a one-to-one correspondence with the branch channels.

2. The battery core exhaust assembly according to claim 1, characterized in that: The arc center line of each branch channel is tangent to the center line of the corresponding main channel.

3. The battery core exhaust assembly according to claim 1, characterized in that: Each of the main channels is correspondingly provided with two groups of branch channel groups, each group of the branch channel groups includes at least two branch channels spaced apart along the length direction of the main channel, and the two groups of the branch channel groups are respectively arranged on both sides of the main channel.

4. The battery core exhaust assembly according to claim 3, characterized in that: The branch channels of the two groups of branch channel groups between two adjacent main channels are connected in a one-to-one correspondence.

5. The battery core exhaust assembly according to any one of claims 1 to 4, characterized in that: The exhaust grooves are symmetrically arranged about a center line in a length direction of the substrate.

6. A battery pack, characterized in that: include: frame; At least two battery modules are arranged in the frame, each of the battery modules includes a plurality of flatly arranged battery cells, and the plurality of battery cells have explosion-proof valves with one side forming an exhaust surface of the battery module and the other side forming a heat dissipation surface of the battery module; A cooling plate, disposed between the heat dissipation surfaces of any two of the battery modules; The battery cell exhaust assembly according to any one of claims 1 to 5 is arranged in a one-to-one correspondence with the battery module, the cover plate is covered on the exhaust surface, the through hole is arranged in a one-to-one correspondence with the explosion-proof valve, and the main channel is arranged in a one-to-one correspondence with the exhaust outlet of the battery pack.

7. The battery pack according to claim 6, characterized in that: It also includes a plurality of buffer components, each of which is sandwiched between the cover plate and the battery module, and each of the buffer components is provided with a plurality of through holes which are arranged one-to-one corresponding to the through holes.

8. The battery pack according to claim 6, characterized in that: It also includes a plurality of heat-conducting members, each of which is sandwiched between the cooling plate and the battery module.

9. The battery pack according to claim 6, characterized in that: The battery cell comprises a positive electrode connecting sheet and a negative electrode connecting sheet, wherein the positive electrode connecting sheet and the negative electrode connecting sheet are respectively arranged on two opposite sides of the battery cell and are symmetrical about the center of the battery cell.

10. The battery pack according to claim 6, characterized in that: Along the height direction of the battery pack, the battery cell exhaust assembly at the bottom is connected to the frame to form a lower shell of the battery pack, and the battery cell exhaust assembly at the top is connected to the frame to form an upper shell of the battery pack.

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