Battery pack exhaust structure and battery pack

Abstract

The utility model discloses a battery pack exhaust structure and a battery pack, wherein the battery pack exhaust structure has at least one exhaust main channel and at least one exhaust branch channel, a plurality of the exhaust branch channels are located between two of the exhaust main channels and both ends of each of the exhaust branch channels are respectively connected to the two exhaust main channels, each of the exhaust branch channels is formed with at least one vent hole, a plurality of the vent holes correspond to a plurality of explosion-proof valves of the battery pack one by one and are closely connected to the ventilation cavity of the explosion-proof valve, and one end of one of the exhaust main channels is connected to the outside of the battery pack. The utility model solves the technical problem in the prior art that after the explosion-proof valve or the fire protection system is opened, the gas or the erupted solid and liquid substances are not restricted in the battery pack, which easily causes pollution to other non-failed battery cells and electrical components.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery pack exhaust structure and a battery pack having the battery pack exhaust structure. Background Art

[0002] The battery cells inside the battery pack are usually equipped with explosion-proof valves to prevent accidents such as fire and explosion, reduce the pressure burden on the battery, and extend the battery life. However, when the explosion-proof valve of the battery pack is opened, the gas and the erupted solid matter will be unrestricted in the battery pack and spray to other battery cells and electrical components, causing other battery cells and electrical components to fail; similarly, when the fire protection system of the battery pack is turned on, the fire protection gas or liquid will be injected into the battery pack and fill the entire battery pack. The filling space is large and the time is long, resulting in a large amount of fire protection gas or liquid required, and the fire protection gas or liquid will also immerse other non-failed battery cells, causing pollution to other non-failed battery cells and electrical components.

[0003] Chinese utility model patent ZL202320577046.4 discloses a "battery pack exhaust structure and battery pack". Although this patented technology can effectively improve the condensation phenomenon in the battery pack and facilitate the discharge of gas in the battery pack during thermal runaway, it still does not solve the shortcomings of the above-mentioned prior art. Utility Model Content

[0004] In view of this, the utility model proposes a battery pack exhaust structure and a battery pack to solve the technical problem in the above-mentioned prior art that after the explosion-proof valve or the fire protection system is opened, the gas or the erupted solid and liquid substances are not restricted in the battery pack, which is easy to cause pollution to other non-failed battery cells and electrical components.

[0005] In order to achieve the above-mentioned technical objectives, the technical solution of the utility model provides a battery pack exhaust structure, which has at least one main exhaust channel and at least one branch exhaust channel, multiple branch exhaust channels are located between two main exhaust channels and both ends of each branch exhaust channel are respectively connected to the two main exhaust channels, each branch exhaust channel is formed with at least one vent hole, multiple vent holes correspond one-to-one to multiple explosion-proof valves of the battery pack and are tightly connected to the ventilation cavity of the explosion-proof valve, and one end of one of the main exhaust channels is connected to the outside of the battery pack.

[0006] Furthermore, the caliber of the vent hole is larger than the outer diameter of the corresponding explosion-proof valve hole.

[0007] Furthermore, the distance between the lower surface of the plurality of exhaust branch channels and the upper surface of the battery cell is 3 to 20 mm.

[0008] Furthermore, it also includes an exhaust hole, which is arranged at one end of one of the main exhaust channels.

[0009] Furthermore, it also includes a fire hole, which is arranged at one end of another of the exhaust main channels, or the fire hole and the exhaust hole are respectively arranged at two ends of the same exhaust main channel.

[0010] Furthermore, the battery pack exhaust structure includes a bottom plate and a side plate, the bottom plate is formed with a plurality of the vents, each of the vents covers the corresponding top of the explosion-proof valve, the side plates are vertically arranged on both sides of the bottom plate, the two ends of the side plates are respectively fixedly connected to the bottom plate and the battery pack cover, and the bottom plate, two side plates and the battery pack cover enclose the main exhaust channel and the branch exhaust channel.

[0011] Furthermore, the battery pack exhaust structure also includes a top plate, both ends of which are fixedly connected to the two side plates respectively, and the top plate, the bottom plate and the two side plates enclose the main exhaust channel and the branch exhaust channel.

[0012] Furthermore, the top plate, the bottom plate and the two side plates are an integrally formed structure or a welded structure.

[0013] In addition, the utility model further provides a battery pack, which includes a plurality of battery cells and the battery pack exhaust structure described in the above technical solution of the utility model, and the battery pack exhaust structure is arranged above the plurality of battery cells.

[0014] Compared with the prior art, the beneficial effects of the utility model mainly include:

[0015] The utility model provides a battery pack exhaust structure and a battery pack, which form a closed channel through an exhaust main channel, an exhaust branch channel and a vent, so that when the explosion-proof valve is opened, gas or solid matter can only be discharged from the vent to the exhaust branch channel, and then discharged to the exhaust main channel, and finally discharged to the outside of the battery pack, without affecting other battery cells and electrical components; when the fire protection system is turned on, the fire protection gas or liquid can quickly reach the failed battery cell through the exhaust structure to prevent the battery cell from further failing, and the fire protection gas or liquid has a small filling space, which saves costs; and the fire protection gas or liquid will not flow to other battery cells and electrical components, effectively avoiding pollution to other battery cells and electrical components. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a top view of the battery pack exhaust structure of the utility model;

[0017] Figure 2 is a top view of the battery pack exhaust structure of the utility model installed on the battery pack;

[0018] Figure 3 is a side view of the battery pack exhaust structure of the utility model installed on the battery pack;

[0019] Figure 4 yes Figure 3 AA section view in;

[0020] Figure 5 yes Figure 4 Enlarged view of point B in .

[0021] As shown in the figure:

[0022] 100. Battery pack exhaust structure, 101. Exhaust main channel, 102. Exhaust branch channel, 103. Vent hole, 104. Exhaust hole, 105. Fire hole, 110. Bottom plate, 120. Side plate, 130. Top plate; 200. Explosion-proof valve. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model. Please refer to Figures 1 to 5 As shown, the utility model provides a battery pack exhaust structure 100, and the battery pack exhaust structure 100 has at least one main exhaust channel 101 and at least one branch exhaust channel 102; in this embodiment, two main exhaust channels 101 are provided, and the plurality of branch exhaust channels 102 are located between the two main exhaust channels 101 and both ends of each branch exhaust channel 102 are respectively connected to the two main exhaust channels 101, and a plurality of vents 103 are respectively formed on both sides of each branch exhaust channel 102, and the plurality of vents 103 correspond one-to-one to the plurality of explosion-proof valves of the battery pack and are closely connected to the ventilation cavity of the explosion-proof valve 200, and one end of one of the main exhaust channels 101 is connected to the outside of the battery pack.

[0024] In the above technical solution, when in use, an exhaust hole 104 is usually opened at one end of one of the exhaust main channels 101, so that the vent hole 103, the exhaust branch channel 102, the exhaust main channel 101 and the exhaust hole 104 are connected into a closed channel, and the gas or solid matter of the explosion-proof valve 200 is ejected from the vent hole 103, flows along the exhaust branch channel 102 and the exhaust main channel 101, and is finally discharged to the outside of the battery pack through the exhaust hole 104. In this way, the flow of the gas or solid matter ejected from the explosion-proof valve is limited to the exhaust structure, and will not be discharged to other battery cells and electrical components, thereby avoiding adverse effects on other battery cells and electrical components.

[0025] In a preferred embodiment, a fire hole 105 is formed at one end of another of the main exhaust channels 101. Thus, when the fire protection system is turned on, the flow of the injected gas or liquid is restricted within the exhaust structure and will not be discharged to other battery cells and electrical components, thereby avoiding adverse effects on other battery cells and electrical components. At the same time, the injected gas or liquid can also quickly reach the failed battery cell, effectively controlling the failed battery cell, reducing fire protection gas or liquid and saving costs.

[0026] In a preferred embodiment, the vent hole 103 covers the explosion-proof valve 200, and the diameter of the vent hole 103 is larger than the outer diameter of the corresponding hole of the explosion-proof valve 200 to ensure that the gas or solid ejected from the explosion-proof valve can all enter the exhaust structure.

[0027] In a preferred embodiment, the lower surfaces of the two main exhaust channels 101 are flush with the lower surfaces of the multiple exhaust branch channels 102, and the lower surfaces of the two main exhaust channels 101 and the multiple exhaust branch channels 102 are both 3 to 20 mm away from the upper surface of the battery cell.

[0028] In a preferred embodiment, the battery pack exhaust structure 100 includes a bottom plate 110 and a side plate 120, the bottom plate 110 is formed with a plurality of the vents 103, each of the vents 103 covers the top of the corresponding explosion-proof valve 200, the side plates 120 are vertically arranged on both sides of the bottom plate 110, and the two ends of the side plates 120 are respectively fixedly connected to the bottom plate 110 and the battery pack cover, and the bottom plate 110, the two side plates 120 and the battery pack cover enclose the exhaust main channel 101 and the exhaust branch channel 102.

[0029] In a preferred embodiment, the battery exhaust structure 100 also includes a top plate 130, and both ends of the top plate 130 are fixedly connected to the two side plates 120 respectively. The top plate 130, the bottom plate 110 and the two side plates 120 enclose the exhaust main channel 101 and the exhaust branch channel 102.

[0030] In a preferred embodiment, the top plate 130 , the bottom plate 110 and the two side plates 120 may be an integrally formed structure or a welded structure.

[0031] That is to say, the battery pack exhaust structure 100 can be a structure consisting of a bottom plate 110 and a side plate 120 directly welded to the bottom surface of the battery pack cover, or it can be an integrally formed structure or a welded structure consisting of a bottom plate 110, a side plate 120 and a top plate 130.

[0032] In addition, the battery pack exhaust structure 100 may also be formed by punching a hole directly on the upper cover of the battery pack.

[0033] In addition, the utility model also provides a battery pack, including a plurality of battery cells and the battery pack exhaust structure 100 described in the above technical solution, wherein the battery pack exhaust structure 100 is arranged above the plurality of battery cells.

[0034] The specific implementation methods of the utility model described above do not constitute a limitation on the protection scope of the utility model. Any other corresponding changes and modifications made according to the technical concept of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A battery pack exhaust structure, characterized in that: It has at least one main exhaust channel and at least one branch exhaust channel; The plurality of exhaust branch channels are located between the two exhaust main channels and both ends of each of the exhaust branch channels are respectively connected to the two exhaust main channels, each of the exhaust branch channels is formed with at least one vent hole, the plurality of vent holes correspond one-to-one to the plurality of explosion-proof valves of the battery pack and are tightly connected to the ventilation cavities of the explosion-proof valves, and one end of one of the exhaust main channels is connected to the outside of the battery pack.

2. The battery pack exhaust structure according to claim 1, characterized in that: The caliber of the vent hole is larger than the outer diameter of the corresponding explosion-proof valve hole.

3. The battery pack exhaust structure according to claim 2, characterized in that: The distance between the lower surface of the exhaust branch channel and the upper surface of the battery core is 3 to 20 mm.

4. The battery pack exhaust structure according to claim 3, characterized in that: It also includes an exhaust hole, which is arranged at one end of one of the main exhaust channels.

5. The battery pack exhaust structure according to claim 4, characterized in that: It also includes a fire hole, which is arranged at one end of another of the exhaust main channels, or the fire hole and the exhaust hole are respectively arranged at two ends of the same exhaust main channel.

6. The battery pack exhaust structure according to claim 1, characterized in that: The battery pack exhaust structure includes a bottom plate and a side plate, the bottom plate is formed with a plurality of the vents, each of the vents covers the corresponding top of the explosion-proof valve, the side plates are vertically arranged on both sides of the bottom plate, the two ends of the side plates are respectively fixedly connected to the bottom plate and the battery pack cover, the bottom plate, the two side plates and the battery pack cover enclose the main exhaust channel and the branch exhaust channel.

7. The battery pack exhaust structure according to claim 6, characterized in that: The battery pack exhaust structure also includes a top plate, both ends of which are fixedly connected to the two side plates respectively, and the top plate, the bottom plate and the two side plates enclose the main exhaust channel and the branch exhaust channel.

8. The battery pack exhaust structure according to claim 7, characterized in that: The top plate, the bottom plate and the two side plates are an integrally formed structure or a welded structure.

9. A battery pack, characterized in that: The invention comprises a plurality of battery cells and a battery pack exhaust structure as claimed in any one of claims 1 to 8, wherein the battery pack exhaust structure is arranged above the plurality of battery cells.

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