battery pack

Abstract

This utility model relates to the field of power battery technology, and more particularly to a battery pack. It includes: a housing having a base plate; a battery cell installed within the housing and having an exhaust side facing the base plate; and a flue gas adsorption component fixedly connected within the housing, located between the base plate and the exhaust side of the battery cell, supporting the battery cell, and adapted to adsorb flue gas when the battery cell experiences thermal runaway. The beneficial effects of this utility model are: the flue gas adsorption component located on the exhaust side of the battery cell not only supports the battery cell but also promptly adsorbs particulate matter from the high-temperature flue gas generated when the battery cell experiences thermal runaway. This helps prevent particulate matter from affecting other surrounding battery cells and reduces the emission of particulate matter to the outside, thus mitigating the hazards of battery cell thermal runaway and improving the safety of the battery pack.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to a battery pack. Background Technology

[0002] Inside the battery pack, thermal runaway of a battery cell generates a large amount of particulate matter in the flue gas, especially for bottom-sprayed cells. After thermal runaway, a large amount of particulate matter is generated at the bottom of the cell and within the battery pack, and is emitted to the outside. The particulate matter in the high-temperature flue gas generated during thermal runaway can easily transfer heat to adjacent cells, causing thermal runaway in those cells. Furthermore, the particulate matter in the emitted high-temperature flue gas can easily ignite the outside of the battery pack. Utility Model Content

[0003] This invention provides a battery pack to solve the technical problem of particulate matter in the high-temperature flue gas generated during thermal runaway of battery cells affecting surrounding battery cells, thereby improving the safety of the battery pack.

[0004] To achieve the above and other related objectives, this utility model provides a battery pack, comprising: The enclosure has a bottom plate; The battery cell is installed inside the housing and has an exhaust side facing the bottom plate; A flue gas adsorption component is fixedly connected to the housing. The flue gas adsorption component is located between the bottom plate and the exhaust side of the battery cell, supports the battery cell, and is adapted to adsorb flue gas when the battery cell experiences thermal runaway.

[0005] In one embodiment of the present invention, the flue gas adsorption component includes a support plate and an adsorption material plate. The support plate is fixedly connected to the housing and supports the battery cell. The support plate has a receiving cavity inside and a first opening facing the exhaust side of the battery cell and communicating with the receiving cavity is provided on the support plate. At least a portion of the adsorption material plate is filled in the receiving cavity.

[0006] In one embodiment of the present invention, the base plate is provided with an exhaust channel, and the first opening penetrates the support plate along the thickness direction of the support plate and communicates with the exhaust channel.

[0007] In one embodiment of the present invention, the adsorption material plate is provided with a second opening corresponding to the first opening.

[0008] In one embodiment of the present invention, in the thickness direction of the support plate, the outer contour of the first opening is located within the outer contour of the second opening.

[0009] In one embodiment of the present invention, an explosion-proof valve is provided on the exhaust side of the battery cell, and the first opening corresponds to the explosion-proof valve.

[0010] In one embodiment of the present invention, the flue gas adsorption component includes an adsorption material plate, which is directly fixedly connected to the housing.

[0011] In one embodiment of the present invention, the base plate is provided with an exhaust channel, and the adsorption material plate is provided with a second opening corresponding to the exhaust side of the battery cell and the exhaust channel.

[0012] In one embodiment of this utility model, an explosion-proof valve is provided on the exhaust side of the battery cell, and the second opening corresponds to the explosion-proof valve.

[0013] In one embodiment of this utility model, the adsorption material plate includes an activated carbon plate, a microporous silica gel plate, a diatomaceous earth plate, a polymer adsorption resin plate, or a layered double hydroxide plate.

[0014] The beneficial effects of this utility model are as follows: The battery pack proposed by this utility model has a flue gas adsorption component located on the exhaust side of the battery cell, which can not only support the battery cell, but also adsorb particulate matter in the high-temperature flue gas generated when the battery cell undergoes thermal runaway. This helps to prevent particulate matter from affecting other battery cells around it, and can reduce the emission of particulate matter to the outside, thereby reducing the harm of battery cell thermal runaway and improving the safety of the battery pack. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0016] In the attached diagram: Figure 1 This is a schematic diagram of the battery pack provided in Embodiment 1 of this utility model; Figure 2 for Figure 1 A schematic diagram of the explosion of the battery pack; Figure 3 for Figure 1 Main view of the battery pack; Figure 4 for Figure 3 Sectional view at point AA; Figure 5 for Figure 1 Side view of the battery pack; Figure 6 for Figure 5 Sectional view at point BB; Figure 7 for Figure 6A magnified schematic diagram of part C in the middle; Figure 8 This is a cross-sectional view of a partial structure of the battery pack provided in Embodiment 2 of this utility model; Figure 9 An exploded view of a partial structure of the battery pack provided in Embodiment 3 of this utility model; Figure 10 This is an exploded view of a partial structure of the battery pack provided in Embodiment 4 of this utility model.

[0017] The attached figures are labeled as follows: Box 1, bottom plate 11, exhaust channel 111, top cover 12, battery cell 2, explosion-proof valve 21, flue gas adsorption component 3, adsorption material plate 31, second opening 311, support plate 32, receiving cavity 321, first opening 322. Detailed Implementation

[0018] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0019] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0020] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0021] Please see Figure 1 , Figure 2 and Figure 9In some alternative embodiments, the present invention provides a battery pack comprising a housing 1, battery cells 2, and a flue gas adsorption component 3. The housing 1 has a top cover 12 and a bottom plate 11. The battery cells 2 are installed inside the housing 1 within an installation space defined between the top cover 12 and the bottom plate 11. The battery cells 2 have an exhaust side facing the bottom plate 11. The flue gas adsorption component 3 is fixedly connected inside the housing 1, located between the bottom plate 11 and the exhaust side of the battery cells 2, and supports the battery cells 2. It is adapted to adsorb flue gas in the event of thermal runaway of the battery cells 2.

[0022] Optionally, the number of battery cells 2 can be multiple, and multiple battery cells 2 can be stacked.

[0023] Optionally, cell 2 may include cylindrical cells or prismatic cells.

[0024] Optionally, the exhaust side of the battery cell 2 is equipped with an explosion-proof valve 21 so that when the battery cell 2 experiences thermal runaway, the particulate matter in the high-temperature flue gas discharged from the explosion-proof valve 21 can be adsorbed by the flue gas adsorption component 3 in a timely manner.

[0025] In the battery pack of the above embodiment, the flue gas adsorption component 3 is located between the exhaust side of the battery cell 2 and the base plate 11. It can not only provide support for the battery cell 2, but also adsorb particulate matter in the high-temperature flue gas generated when the battery cell 2 undergoes thermal runaway. It separates the combustible gas from the particulate matter, which helps to avoid the combustible gas from being ignited by the particulate matter and to reduce the harm of exhaust to the outside world, thereby improving the safety of the battery pack.

[0026] See Figures 1 to 8 In some optional embodiments, the flue gas adsorption component 3 includes a support plate 32 and an adsorption material plate 31. The support plate 32 is fixedly connected to the housing 1 and supports the battery cell 2. The support plate 32 has a receiving cavity 321 inside. The support plate 32 has a first opening 322 facing the exhaust side of the battery cell 2 and communicating with the receiving cavity 321. At least a portion of the adsorption material plate 31 is filled in the receiving cavity 321, that is, the adsorption material plate 31 is constructed as an adsorption material sandwich structure.

[0027] Optionally, the support plate 32 may include a plastic plate.

[0028] Optionally, the base plate 11 is provided with an exhaust channel 111, which extends along the stacking direction of the multiple battery cells 2 so that the multiple battery cells 2 can share the same exhaust channel 111, resulting in a compact layout. The first opening 322 penetrates the support plate 32 along the thickness direction of the support plate 32 and communicates with the exhaust channel 111. High-temperature flue gas enters the receiving cavity 321 through the first opening 322, and most of the particulate matter in the high-temperature flue gas can be adsorbed by the adsorption material plate 31. The flue gas adsorption component 3 can quickly adsorb the particulate matter in the high-temperature flue gas after the battery cell 2 runs away, which helps to reduce the exhaust pressure of the battery pack, so as to appropriately reduce the depth of the exhaust channel 111, thereby helping to reduce the overall height of the battery pack and thus helping to improve the energy density of the battery pack. Among them, there are multiple first openings 322, which are distributed at intervals along the stacking direction of the multiple battery cells 2 and correspond one-to-one with the multiple battery cells 2, so that the high-temperature flue gas generated by the thermally runaway battery cell 2 can be discharged in time through the corresponding first opening 322.

[0029] Optionally, the adsorbent material plate 31 is provided with second openings 311 corresponding to the first openings 322. Further, see... Figure 8 In the thickness direction of the support plate 32, the outer contour of the second opening 311 is larger than the outer contour of the first opening 322. In other words, in the thickness direction of the support plate 32, the outer contour of the first opening 322 is located within the outer contour of the second opening 311. This is beneficial for the high-temperature flue gas to enter the containment cavity 321 and for the particulate matter to be adsorbed by the adsorption material plate 31, thereby improving the adsorption effect of the adsorption material plate 31.

[0030] Optionally, the first opening 322 corresponds to the explosion-proof valve 21 so that high-temperature flue gas can quickly enter the first opening 322.

[0031] It should be noted that in this utility model, the width direction of the battery pack is the X direction in the attached figure; the length direction of the battery pack, the stacking direction of the multiple cells 2, the distribution direction of the multiple first openings 322, the distribution direction of the multiple second openings 311, and the extension direction of the exhaust channel 111 are the same, which is the Y direction in the attached figure; the height direction of the battery pack, the thickness direction of the support plate 32, and the depth direction of the exhaust channel 111 are the same, which is the Z direction in the attached figure.

[0032] In the battery pack of the above embodiment, the adsorption material plate 31 is filled in the receiving cavity 321 of the support plate 32, which helps to improve the overall structural reliability of the flue gas adsorption component 3, ensuring the stability of the support for the battery cell 2, and adsorbing particulate matter in the high-temperature flue gas.

[0033] See Figure 9 and Figure 10In some optional embodiments, the flue gas adsorption component 3 includes an adsorption material plate 31, or in other words, the flue gas adsorption component 3 is a plate made directly of adsorption material. The adsorption material plate 31 is directly fixedly connected to the housing 1. The structure is simple and helps to reduce the number of parts and increase the energy density of the battery pack.

[0034] Optional, see Figure 10 In some specific embodiments, the base plate 11 is provided with an exhaust channel 111, and the adsorption material plate 31 is provided with a second opening 311 corresponding to the exhaust side of the battery cell 2 and the exhaust channel 111, so that the high-temperature flue gas that is not adsorbed by the adsorption material plate 31 can be discharged in time through the exhaust channel 111.

[0035] Furthermore, the exhaust side of the battery cell 2 is provided with an explosion-proof valve 21, and the second opening 311 corresponds to the explosion-proof valve 21 so that high-temperature flue gas can quickly enter the second opening 311.

[0036] See Figure 2 and Figure 9 In some optional embodiments, the adsorbent material plate 31 includes an activated carbon plate, a microporous silica gel plate, a diatomaceous earth plate, a polymer adsorbent resin plate, a layered double hydroxide (LDHs) plate, or a plate made of other materials capable of adsorbing particulate matter in flue gas. This provides good adsorption and helps reduce the hazards of thermal runaway.

[0037] The battery pack of this utility model has a flue gas adsorption component 3 installed between the exhaust side of the battery cell 2 and the bottom plate 11 of the housing 1. The flue gas adsorption component 3 can quickly adsorb particulate matter in the high-temperature flue gas generated when the battery cell 2 experiences thermal runaway. This helps to reduce the interference of particulate matter in the high-temperature flue gas to the surrounding battery cells 2 and prevent particulate matter from being emitted to the outside, thereby reducing the hazards of thermal runaway.

[0038] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A battery pack, characterized in that, include: The enclosure has a bottom plate; The battery cell is installed inside the housing and has an exhaust side facing the bottom plate; A flue gas adsorption component is fixedly connected to the housing. The flue gas adsorption component is located between the bottom plate and the exhaust side of the battery cell, supports the battery cell, and is adapted to adsorb flue gas when the battery cell experiences thermal runaway.

2. The battery pack according to claim 1, characterized in that, The flue gas adsorption component includes a support plate and an adsorption material plate. The support plate is fixedly connected to the housing and supports the battery cell. The support plate has a receiving cavity and a first opening facing the exhaust side of the battery cell and communicating with the receiving cavity. At least a portion of the adsorption material plate is filled in the receiving cavity.

3. The battery pack according to claim 2, characterized in that, The base plate is provided with an exhaust channel, and the first opening penetrates the support plate along the thickness direction of the support plate and communicates with the exhaust channel.

4. The battery pack according to claim 3, characterized in that, The adsorption material plate is provided with a second opening corresponding to the first opening.

5. The battery pack according to claim 4, characterized in that, In the thickness direction of the support plate, the outer contour of the first opening is located within the outer contour of the second opening.

6. The battery pack according to claim 2, characterized in that, The battery cell is equipped with an explosion-proof valve on its exhaust side, and the first opening corresponds to the explosion-proof valve.

7. The battery pack according to claim 1, characterized in that, The flue gas adsorption component includes an adsorption material plate, which is directly fixedly connected to the housing.

8. The battery pack according to claim 7, characterized in that, The base plate is provided with an exhaust channel, and the adsorption material plate is provided with a second opening corresponding to the exhaust side of the battery cell and the exhaust channel.

9. The battery pack according to claim 8, characterized in that, The battery cell is equipped with an explosion-proof valve on its exhaust side, and the second opening corresponds to the explosion-proof valve.

10. The battery pack according to claim 2 or 7, characterized in that, The adsorption material plate includes activated carbon plate, microporous silica gel plate, diatomaceous earth plate, polymer adsorption resin plate or layered double hydroxide plate.

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