Battery cell housing, battery cell, and vehicle

Abstract

This utility model discloses a battery cell housing, a battery cell, and a vehicle. The battery cell housing includes a channel plate with at least one channel. The channel is filled with a flame retardant. The channel plate has an opening, and the channel communicates with the opening. A sealing structure is provided on the channel plate to seal the opening. The sealing structure is configured to be punctured by the flame retardant and / or melted by heat, so that the opening communicates with the receiving cavity of the battery cell housing. In an embodiment of this utility model, in the initial stage of thermal runaway, the flame retardant is sprayed into the receiving cavity through the opening, providing flame retardancy to the battery cell body located within the receiving cavity, thereby effectively suppressing the continued occurrence of thermal runaway.

Description

Technical Field

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

[0002] Battery packs in new energy vehicles contain several cells, which can be classified into pouch cells, cylindrical cells, aluminum-cased cells, etc., depending on the form of their outer packaging.

[0003] Battery cells are prone to thermal runaway due to internal defects or abuse conditions. When thermal runaway occurs, the internal temperature of the battery cell rises rapidly, accompanied by risks such as gas production, smoke, fire, and explosion.

[0004] When the risk of thermal runaway occurs, how to effectively suppress the continued occurrence of thermal runaway is an urgent problem to be solved. Utility Model Content

[0005] This utility model provides a battery cell housing, a battery cell, and a vehicle, aiming to at least solve the technical problem of how to effectively suppress the continuous occurrence of thermal runaway in the prior art.

[0006] In a first aspect of this utility model, a battery cell housing is provided, the battery cell housing including a channel plate, the channel plate having at least one channel, the channel being filled with a flame retardant, the channel plate having an opening, and the channel communicating with the opening;

[0007] The channel plate is provided with a sealing structure, which is used to seal the opening;

[0008] The sealing structure is configured to be punctured by the flame retardant and / or melted by heat, so that the opening communicates with the receiving cavity of the cell housing.

[0009] Optionally, the sealing structure is a sealant layer.

[0010] Optionally, the maximum pressure that the sealant layer can withstand is 0.35MPa-0.9MPa, and the maximum pressure that the sealant layer can withstand is less than or equal to the pressure relief pressure of the explosion-proof valve of the battery cell.

[0011] And / or, the melting point of the sealant layer is 70℃-130℃.

[0012] Optionally, the channel plate has a hollow cavity, and the hollow cavity is provided with a partition rib, which divides the hollow cavity into multiple channels.

[0013] Optionally, the cell housing includes two first side plates arranged opposite each other along the width direction and two second side plates arranged opposite each other along the length direction, and the channel plate is the first side plate and / or the second side plate;

[0014] The channel extends along the height direction of the cell housing, the opening is formed at the top of the channel plate and faces upward, and the sealing structure is provided at the top of the channel plate;

[0015] When the cell housing is connected to the cell cover plate, a gap is formed between the cell cover plate and the sealing structure along the height direction of the cell housing. When the sealing structure is broken by the flame retardant and / or melted by heat, the opening communicates with the accommodating cavity through the gap.

[0016] Optionally, along the thickness direction of the channel plate, the size of the channel is 0.1mm-10mm, and the thickness of the channel plate is 1.1mm-12mm.

[0017] Optionally, the channel plate includes an inner plate portion and an outer plate portion disposed opposite to each other along the thickness direction of the channel plate. Along the height direction of the cell housing, the top end of the outer plate portion is higher than the top end of the inner plate portion, and the height difference is 5mm-10mm. The portion of the outer plate portion that is higher than the inner plate portion is used to connect with the cell cover plate.

[0018] Optionally, the flame retardant is a flame retardant gel or a liquid flame retardant.

[0019] In a second aspect of this invention, a battery cell is also provided, comprising the battery cell housing as described above.

[0020] In a third aspect of this invention, a vehicle is also provided, including a battery pack comprising at least one battery cell as described above.

[0021] In this embodiment of the invention, in the initial stage of thermal runaway, the internal temperature of the battery cell rises and is accompanied by a large amount of gas production, increasing the internal pressure of the battery cell. The gas inside the battery cell and / or the battery cell body compresses the channel plate. When the channel plate is compressed, it compresses the flame retardant inside, causing the flame retardant to rush towards the opening. The sealing structure is broken by the flame retardant and / or melted by heat, making the opening connected to the accommodating cavity of the battery cell shell. This allows the flame retardant to be sprayed out through the opening into the accommodating cavity, playing a flame-retardant role on the battery cell body located in the accommodating cavity, thereby effectively suppressing the continued occurrence of thermal runaway. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0023] Figure 1 This is a side cross-sectional view of the battery cell housing provided in an embodiment of the present utility model;

[0024] Figure 2This is a partial top view of the battery cell housing provided in the embodiments of this utility model;

[0025] Figure 3 This is a schematic diagram showing the fit between the battery cell housing and the battery cell cover plate provided in an embodiment of this utility model.

[0026] Figure label:

[0027] 1-Cell casing, 11-First side plate, 12-Second side plate, 13-Inner plate, 14-Outer plate, 2-Channel, 3-Separating rib, 4-Flame retardant, 5-Sealing adhesive layer, 6-Accommodation cavity, 7-Cell cover plate. Detailed Implementation

[0028] The technical solutions of the present invention will now be described with reference to the accompanying drawings in the embodiments of the present invention.

[0029] The embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention. The invention will be described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the invention.

[0030] Battery cells are prone to thermal runaway due to internal defects or abuse conditions. When thermal runaway occurs, the internal temperature of the battery cell rises rapidly, accompanied by risks such as gas production, smoke, fire, and explosion. How to effectively suppress the occurrence of thermal runaway is a pressing problem that needs to be solved. To address the above problems, this utility model provides a battery cell housing, a battery cell, and a vehicle. The battery cell housing, battery cell, and vehicle mentioned above are described in detail below.

[0031] This utility model embodiment provides a battery cell, which includes a battery cell housing and a battery cell cover plate. The battery cell housing has a receiving cavity, and the battery cell cover plate is disposed on the battery cell housing. The battery cell also includes a battery cell body, which is located within the receiving cavity of the battery cell housing. The battery cell body is a wound core or a stack of battery cells.

[0032] This battery cell specifically refers to a cell used in power batteries. It can be used in various vehicles, such as electric cars, electric buses, electric motorcycles, and electric trucks. The cell can be a lithium-ion cell, such as a high-nickel lithium-ion cell, a lithium manganese oxide cell, a ternary lithium-ion cell, a lithium iron phosphate cell, or a lithium titanate cell.

[0033] The material used for the outer packaging of the battery cells must possess sufficient impact resistance, be resistant to electrolyte corrosion, and ensure tight sealing to prevent leakage and breakage in high-temperature, low-temperature, and high-humidity environments. To mitigate the explosion hazards caused by thermal runaway of the battery cells, each cell is equipped with an explosion-proof valve. When gas is generated inside the cell to a certain level and the internal pressure reaches the threshold of the explosion-proof valve, the valve opens to release pressure and prevent excessive pressure from causing an explosion. Under normal circumstances, the outer packaging of the battery cells provides basic protection.

[0034] Reference Figure 1 and Figure 2 This utility model provides a battery cell housing 1, which includes a channel plate with at least one channel 2. The channel 2 is filled with flame retardant 4 and has an opening. The channel plate is connected to the opening. The channel plate is provided with a sealing structure for sealing the opening. The sealing structure is configured to be punctured by the flame retardant and / or melted by heat so that the opening is connected to the receiving cavity 6 of the battery cell housing 1.

[0035] The battery cell housing 1 is square, and its accommodating cavity 6 has a top opening. The battery cell housing 1 includes two first side plates 11 arranged opposite each other along its width, two second side plates 12 arranged opposite each other along its length, and a bottom plate. The length direction of the battery cell housing 1 can be referenced... Figure 2 The direction indicated by arrow B in the middle indicates the width direction of the cell casing 1. Figure 2 The direction indicated by arrow C. The channel plate is preferably a first side plate 11 and / or a second side plate 12. The channel plate preferably has multiple spaced channels 2. The flame retardant 4 inhibits ignition and explosion; the flame retardant 4 can be a flame-retardant gel or a liquid flame retardant.

[0036] During charging and discharging, the lithium insertion and extraction reactions cause the cell body to continuously contract and expand. At 100% SOC (State of Charge), the thickness of the cell body reaches its maximum. At this point, the internal cell body exerts pressure on the channel plate. As the cell's lifespan decreases and it is used under prolonged high-temperature conditions, this pressure gradually increases. For example, lithium plating and its long-term accumulation can increase the thickness of the cell body; prolonged use under high-temperature conditions can induce electrolyte decomposition and gas production, leading to increased internal pressure; and even thermal runaway caused by internal defects can cause the cell body to bulge instantaneously, producing a large amount of gas and instantly increasing internal pressure. All of these factors contribute to a gradual increase in the pressure exerted on the channel plate.

[0037] Flame retardant 4 is configured to rush towards the opening when the channel plate is compressed. As one example, the opening is located at the top of the channel plate and faces upwards. As another example, the opening is located at the top of the channel plate and faces inwards. The compressive force on the channel plate varies under different operating conditions. When the channel plate is compressed, it compresses the flame retardant 4 inside, causing the flame retardant 4 to rush towards the opening. The flame retardant 4 rushing towards the opening exerts force on the sealing structure. When the force exerted by the flame retardant 4 on the sealing structure exceeds the sealing structure's bearing limit, the sealing structure will be broken by the flame retardant 4. That is, when the compressive force on the channel plate is large enough, the flame retardant 4 rushing towards the opening will break through the sealing structure. After the sealing structure is broken, the opening connects with the receiving cavity 6 of the cell housing 1, and the flame retardant 4 is ejected into the receiving cavity 6 through the opening.

[0038] As one example, both the ejection of flame retardant 4 and the breaking of the sealing structure are affected by the compressive force on the channel plate. As another example, the ejection of flame retardant 4 is affected by the compressive force on the channel plate, and the breaking of the sealing structure is affected by temperature. As yet another example, both temperature and the compressive force on the channel plate affect the breaking of the sealing structure.

[0039] In this embodiment, in the early stage of thermal runaway, the internal temperature of the cell rises and a large amount of gas is generated, the internal pressure of the cell increases, and the gas inside the cell and / or the cell body squeezes the channel plate. When the channel plate is squeezed, it squeezes the flame retardant 4 inside, causing the flame retardant 4 to rush towards the opening. The sealing structure is broken by the flame retardant 4 and / or melted by heat, so that the opening is connected to the accommodating cavity 6 of the cell housing 1. Thus, the flame retardant 4 is sprayed out into the accommodating cavity 6 through the opening, which plays a flame retardant role on the cell body located in the accommodating cavity 6, thereby effectively suppressing the continued occurrence of thermal runaway.

[0040] In some embodiments, the sealing structure is a sealant layer 5. The sealant can be EVA (Ethylene Vinyl Acetate) hot melt adhesive, PA (Polyamide) hot melt adhesive, PU (Polyurethane) hot melt adhesive, PE (Polyethylene) hot melt adhesive, etc. In this embodiment, the sealant layer 5 has good sealing performance, preventing the flame retardant 4 from leaking under normal operating conditions. Normal operating conditions refer to the normal charging and discharging process of the battery cell throughout its entire lifespan.

[0041] In some embodiments, the maximum pressure that the sealant layer 5 can withstand is 0.35MPa-0.9MPa, and the maximum pressure that the sealant layer 5 can withstand is less than or equal to the pressure relief of the explosion-proof valve of the battery cell; and / or, the melting point of the sealant layer 5 is 70℃-130℃.

[0042] The maximum pressure that the sealant layer 5 can withstand is the highest pressure it can withstand without damage or failure. The pressure relief pressure of the explosion-proof valve is the pressure it experiences when it opens to release pressure. The maximum pressure that the sealant layer 5 can withstand can be 0.35 MPa, 0.4 MPa, 0.5 MPa, 0.6 MPa, 0.9 MPa, etc.

[0043] The maximum pressure that the sealant layer 5 can withstand is greater than or equal to 0.35 MPa. At this time, when the expansion of the cell body due to lithium plating increases or the internal pressure of the cell increases due to gas production from side reactions, the channel plate will be squeezed, which will squeeze the flame retardant 4 inside, causing the flame retardant 4 to rush towards the opening. The sealant layer 5 will be subjected to the force exerted by the flame retardant 4. The pressure exerted by the flame retardant 4 on the sealant layer 5 is greater than or equal to 0.35 MPa. The sealant layer 5 is ruptured by the flame retardant 4, so that the opening is connected to the receiving cavity 6 of the cell housing 1, thereby allowing the flame retardant 4 to be sprayed out into the receiving cavity 6 through the opening.

[0044] If the maximum pressure that the sealant layer 5 can withstand is set too low, the sealant layer 5 will be ruptured by the flame retardant 4 when the channel plate is compressed during normal charging and discharging throughout the battery cell's lifespan. This would cause the flame retardant 4 to spray out under normal operating conditions, thus affecting the battery cell's performance. In this embodiment, the maximum pressure that the sealant layer 5 can withstand is greater than or equal to 0.35 MPa, which can prevent the flame retardant 4 from spraying out under normal operating conditions, thereby avoiding any impact on the battery cell's performance.

[0045] In this embodiment, the maximum pressure that the sealant layer 5 can withstand is less than or equal to the pressure relief pressure of the explosion-proof valve of the battery cell. This can prevent the flame retardant 4 from being unable to be sprayed out in a timely and effective manner when the gas pressure inside the battery cell is too high and breaks through the explosion-proof valve, before the sealant layer 5 is broken through.

[0046] The melting point of sealant layer 5 can be 70℃, 80℃, 90℃, 100℃, 130℃, etc. When the sealant is EVA hot melt adhesive, the melting point of sealant layer 5 is usually between 70℃ and 90℃. When the sealant is PA hot melt adhesive or PU hot melt adhesive, the melting point of sealant layer 5 is usually around 100℃. When the sealant is low-melting-point PE hot melt adhesive, the melting point of the sealant is around 130℃.

[0047] When the battery cell is subjected to abuse conditions, specifically high-temperature use exceeding 70°C, and the cell body does not show an increase in thickness due to lithium plating, or if there is no significant gas production from side reactions within a short period, the sealing layer 5 can be utilized to melt and detach prematurely when the pressure exerted by the flame retardant 4 is less than 0.35 MPa. This significantly reduces the compressive force required for the flame retardant 4 to be ejected into the accommodating cavity 6 through the opening. After the sealing layer 5 melts and detaches prematurely, under high-temperature use conditions exceeding the upper limit of the cell temperature, the flame retardant 4 can be squeezed out in a timely manner along with the reaction process, causing it to absorb some heat and inhibit the continued occurrence of high-temperature side reactions.

[0048] In some embodiments, the channel plate has a hollow cavity, and a partition rib 3 is provided in the hollow cavity, dividing the hollow cavity into multiple channels 2. Along the arrangement direction of the multiple channels 2, the partition rib 3 can be a continuous strip or divided into multiple segments. The material of the partition rib 3 can be the same as the material of the channel plate itself; for example, the material of the partition rib 3 can be aluminum. In this embodiment, by setting the partition rib 3, on the one hand, the hollow cavity can be divided into multiple channels 2 to ensure the total amount of flame retardant 4 contained in the channel plate; on the other hand, the structural strength of the channel plate can be improved.

[0049] In some embodiments, the channel plate is a first side plate 11 and / or a second side plate 12 of the cell housing 1; the channel 2 extends along the height direction of the cell housing 1, with an opening at the top of the channel plate and facing upwards, and a sealing structure is disposed at the top of the channel plate; see reference Figure 3 When the cell housing 1 is connected to the cell cover plate 7, a gap is formed between the cell cover plate 7 and the sealing structure along the height direction of the cell housing 1. The sealing structure is broken by the flame retardant and / or melted by heat, and the opening communicates with the accommodating cavity 6 through the gap.

[0050] As an example, the channel plate is one of the first side plates 11. As another example, see... Figure 1 and Figure 2 The channel plate consists of two first side plates 11. As another example, the channel plate consists of two first side plates 11 and two second side plates 12. The height extension of the cell housing 1 can be referenced... Figure 1 The direction indicated by arrow A. The gap between the sealing structure and the cell cover plate 7 can be 2mm-3mm. When the sealing structure is punctured by the flame retardant 4 and / or melted by heat, the flame retardant 4, when sprayed out through the opening, will first enter the gap between the cell cover plate 7 and the sealing structure, and after being blocked by the cell cover plate 7, will enter the receiving cavity 6. In this embodiment, the opening is opened at the top of the channel plate and faces upwards, and the sealing structure is located at the top of the channel plate, which facilitates the filling of the flame retardant 4 into the channel 2 from the opening and can avoid the sealing structure being affected by the electrolyte inside the cell.

[0051] When the channel plate is the first side plate 11, the partition rib 3 divides the hollow cavity into multiple channels 2 along the length of the cell housing 1, that is, multiple channels 2 are arranged along the length of the cell housing 1. Along the length of the cell housing 1, the partition rib 3 can be a continuous strip. In this case, the shape of the cross-section of the partition rib 3 perpendicular to the height direction of the cell housing 1 can be wavy, sawtooth, etc. Along the length of the cell housing 1, the partition rib 3 can also be divided into multiple segments; for example, the number of segments of the partition rib 3 is one less than the number of channels 2.

[0052] In some embodiments, the dimension of channel 2 is 0.1mm-10mm along the thickness direction of the channel plate, and the thickness of the channel plate is 1.1mm-12mm.

[0053] The shape of the cross-section of channel 2 perpendicular to the height direction of the cell housing 1 can be circular, elliptical, semi-circular, arc-shaped, triangular, rectangular, etc. Along the thickness direction of the channel plate, the dimensions of channel 2 can be 0.1mm, 1mm, 3mm, 5mm, 7mm, 10mm, etc. The thickness of the channel plate is the sum of the thickness of the hollow cavity, the thickness of the inner plate portion 13, and the thickness of the outer plate portion 14. The thickness of the channel plate can be 1.1mm, 2mm, 5mm, 7mm, 9mm, 12mm, etc.

[0054] If the dimension of channel 2 along the thickness direction of the channel plate is less than 0.1 mm, it will result in excessively dense channel 2 distribution in the channel plate, leading to complex process design, excessively high costs, and the channel plate will not be able to accommodate sufficient flame retardant 4. The thickness of the channel plate is affected by the dimension of channel 2 along the thickness direction of the channel plate. If the dimension of channel 2 along the thickness direction of the channel plate is greater than 10 mm, it will lead to an increase in the thickness of the channel plate. Unnecessary increases in thickness will cause a decrease in the energy density of the battery cell, affecting the performance of the battery cell.

[0055] In some embodiments, the channel plate includes an inner plate portion 13 and an outer plate portion 14 disposed opposite to each other along the thickness direction of the channel plate. Along the height direction of the cell housing 1, the top end of the outer plate portion 14 is higher than the top end of the inner plate portion 13, and the height difference is 5mm-10mm. The portion of the outer plate portion 14 that is higher than the inner plate portion 13 is used to connect with the cell cover plate 7.

[0056] The thickness of the inner plate 13 can be less than or equal to 1 mm, and the thickness of the outer plate 14 can be less than or equal to 1 mm. The portion of the outer plate 14 that protrudes above the inner plate 13 is used for welding to the cell cover 7. The height difference between the top of the outer plate 14 and the top of the inner plate 13 can be 5 mm, 7 mm, 8 mm, 9 mm, 10 mm, etc. In this embodiment, the top of the outer plate 14 is higher than the top of the inner plate 13, and the height difference is 5 mm to 10 mm, which ensures normal welding between the cell cover 7 and the cell housing 1, and allows sufficient clearance between the sealing structure and the cell cover 7, for example, a clearance of 2 mm to 3 mm between the sealing structure and the cell cover 7.

[0057] In some embodiments, flame retardant 4 is a flame retardant gel or a liquid flame retardant.

[0058] The flame retardant 4 can be a brominated flame retardant, a phosphorus-based flame retardant, a nitrogen-based flame retardant, an inorganic flame retardant, a halogen free radical flame retardant, or an environmentally friendly flame retardant. Preferably, the flame retardant 4 is a flame-retardant gel. When heated, the flame-retardant gel absorbs heat and expands, forming a heat-insulating layer that hinders heat transfer. Alternatively, the flame-retardant gel decomposes when heated, releasing substances that inhibit the combustion reaction, forming another heat-insulating layer that also hinders heat transfer. When the flame retardant 4 is a flame-retardant gel, in the initial stage of thermal runaway, the flame-retardant gel is sprayed into the receiving cavity 6 through the opening, covering the battery cell body located within the receiving cavity, forming a heat-insulating layer that hinders heat transfer, thus more effectively suppressing the occurrence of thermal runaway.

[0059] In another embodiment of the present invention, a vehicle is also provided, including a battery pack, the battery pack including at least one battery cell provided in the above embodiments.

[0060] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the aforementioned element.

[0061] It's important to note that when a component is described as "fixed to" another component, it can be directly on the other component or it may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or it may have a component in between. When a component is considered "set to" another component, it can be directly set on the other component or it may have a component in between. The term "vertical" as used in this article...

[0062] The terms "of", "horizontal", "left", "right" and similar expressions are used for illustrative purposes only.

[0063] The various embodiments in this specification are described in a related manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0064] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model are included within the scope of protection of this utility model.

[0065] The battery cell housing, battery cell, and vehicle provided by this utility model have been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the structure and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. An electric cell housing, characterized by, The cell housing includes a channel plate, on which at least one channel is formed, the channel is filled with flame retardant, and the channel plate has an opening, the channel being in communication with the opening; The channel plate is provided with a sealing structure, which is used to seal the opening; The sealing structure is configured to be punctured by the flame retardant and / or melted by heat, so that the opening communicates with the receiving cavity of the cell housing.

2. The cell housing according to claim 1, characterized in that, The sealing structure is a sealant layer.

3. The cell case of claim 2, wherein, The maximum pressure that the sealant layer can withstand is 0.35MPa-0.9MPa, and the maximum pressure that the sealant layer can withstand is less than or equal to the pressure relief pressure of the explosion-proof valve of the battery cell. And / or, the melting point of the sealant layer is 70℃-130℃.

4. The cell housing of any one of claims 1 to 3, wherein, The channel plate has a hollow cavity, and the hollow cavity is provided with a partition rib, which divides the hollow cavity into multiple channels.

5. The cell housing of claim 4, wherein, The cell housing includes two first side plates arranged opposite each other along the width direction and two second side plates arranged opposite each other along the length direction, and the channel plate is the first side plate and / or the second side plate; The channel extends along the height direction of the cell housing, the opening is formed at the top of the channel plate and faces upward, and the sealing structure is provided at the top of the channel plate; When the cell housing is connected to the cell cover plate, a gap is formed between the cell cover plate and the sealing structure along the height direction of the cell housing. When the sealing structure is broken by the flame retardant and / or melted by heat, the opening communicates with the accommodating cavity through the gap.

6. The cell housing of claim 5, wherein, Along the thickness direction of the channel plate, the size of the channel is 0.1mm-10mm, and the thickness of the channel plate is 1.1mm-12mm.

7. The cell case of claim 5, wherein, The channel plate includes an inner plate portion and an outer plate portion disposed opposite to each other along the thickness direction of the channel plate. Along the height direction of the cell housing, the top end of the outer plate portion is higher than the top end of the inner plate portion, and the height difference is 5mm-10mm. The portion of the outer plate portion that is higher than the inner plate portion is used to connect with the cell cover plate.

8. The cell housing of any one of claims 1 to 3, wherein, The flame retardant is a flame retardant gel or a liquid flame retardant.

9. An electric cell characterized by Includes the cell housing as described in any one of claims 1 to 8.

10. A vehicle characterized by comprising: It includes a battery pack, the battery pack including at least one cell as described in claim 9.

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