An electric cell and battery

Abstract

This application discloses a battery cell and battery pack, comprising a casing, electrode assemblies, and a thermal deformation structure. Both the electrode assemblies and the thermal deformation structure are disposed within the casing. When the temperature of the thermal deformation structure is greater than or equal to a temperature threshold, the thermal deformation structure deforms and forms a flow channel for the internal gas circulation of the battery cell. Specifically, the thermal deformation structure can be disposed between the casing and the electrode assemblies to create a flow channel between the thermal deformation structure and the inner wall of the casing and / or the electrode assemblies. The number of electrode assemblies is at least two, and the thermal deformation structure can be disposed between two adjacent electrode assemblies to form a flow channel between the thermal deformation structure and its adjacent electrode assembly. The battery cell provided in this application controls the deformation of the thermal deformation structure through temperature changes. After deformation, a flow channel is created between the thermal deformation structure and the electrode assemblies and / or the casing, making the ejection path of thermal runaway gas controllable, minimizing the impact on the electrode assemblies, and improving safety performance.

Description

[0001] This application claims priority to Chinese Utility Model Patent Application No. 202423024470X, filed on December 6, 2024, entitled "A Battery Cell and Battery Pack", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and more specifically, to a battery cell and a battery pack. Background Technology

[0003] Currently, lithium iron phosphate batteries produce a large amount of gas within their cells. In the event of thermal runaway, the explosive gases inside the cell often cannot be effectively controlled. These gases compress between the layers of the cell winding, forming channels and releasing pressure through the explosion-proof valve. Due to the excessively high pressure, the cell winding near the explosion-proof valve experiences a strong impact. This impact can cause the separator to rupture, making it easy for the positive and negative electrode plates to collide and generate sparks. Simultaneously, particles from the positive and negative electrodes can easily detach under the influence of high-speed gas, rubbing against the explosion-proof valve or electrode plates and igniting sparks, ultimately leading to a battery explosion and posing a significant safety hazard.

[0004] Therefore, improving battery safety has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of this application is to provide a battery cell to improve battery safety.

[0006] Another object of this application is to provide a battery pack including the above-mentioned cells.

[0007] To achieve the above objectives, this application provides the following technical solution:

[0008] A battery cell, comprising:

[0009] case;

[0010] Electrode assemblies are disposed within the housing;

[0011] A thermal deformation structure is disposed within the housing.

[0012] When the temperature of the thermal deformation structure is greater than or equal to a temperature threshold, the thermal deformation structure deforms and forms a flow channel.

[0013] Optionally, in the above-mentioned battery cell, the thermal deformation structure is disposed between the inner wall of the housing and the electrode assembly;

[0014] When the temperature of the thermally deformable structure is greater than or equal to the temperature threshold, the thermally deformable structure deforms and forms the flow channel between the inner wall of the housing and / or the electrode assembly.

[0015] Optionally, in the above-mentioned battery cell, the number of electrode assemblies is at least two, and the thermal deformation structure is disposed between two adjacent electrode assemblies;

[0016] When the temperature of the thermally deformed structure is greater than or equal to the temperature threshold, the thermally deformed structure deforms and forms the flow channel between at least one adjacent electrode assembly.

[0017] Optionally, in the above-mentioned battery cell, the thermal deformation structure includes a first thermal deformation sheet, which is disposed between two adjacent electrode assemblies;

[0018] When the temperature of the first thermal deformation sheet is greater than or equal to the temperature threshold, the first thermal deformation sheet protrudes and deforms in the direction of at least one adjacent electrode assembly, and forms the flow channel between the first thermal deformation sheet and at least one adjacent electrode assembly.

[0019] Optionally, in the above-mentioned battery cell, the thermal deformation structure further includes a second thermal deformation sheet, which is disposed between the two adjacent electrode assemblies and on one side of the first thermal deformation sheet;

[0020] When the temperature of the first and second heat-deformed sheets is greater than or equal to the temperature threshold, the first and second heat-deformed sheets bulge and deform in a direction away from each other, and the flow channel is formed between the first and second heat-deformed sheets.

[0021] Optionally, in the above-mentioned battery cell, the temperature threshold is 80℃-120℃; and / or,

[0022] The thermal deformation structure is made of shape memory alloy, which includes at least one of nickel-titanium alloy, copper-aluminum-nickel alloy, copper-zinc-aluminum alloy, iron-platinum alloy, and nickel-aluminum alloy.

[0023] Optionally, in the above-mentioned battery cell, the housing includes a plurality of enclosure plates, at least one of which is a thermal deformation plate;

[0024] When the temperature of the heat-deformation plate is greater than or equal to the temperature threshold, the heat-deformation plate bulges outward from the shell.

[0025] Optionally, in the above-described battery cell, the electrode assembly has a wound structure, and the extension direction of the flow channel is perpendicular to the winding plane of the electrode assembly; or,

[0026] The electrode assembly has a stacked structure, and the extension direction of the flow channel is perpendicular to the stacking direction of the electrode assembly.

[0027] Optionally, in the above-mentioned battery cell, an explosion-proof component is provided on the housing, the explosion-proof component is disposed in the extension direction of the flow channel and communicates with the flow channel.

[0028] A battery pack comprising at least one of the aforementioned cells connected in series and parallel.

[0029] The battery cell provided in this application includes a housing, electrode assemblies, and a thermal deformation structure. Both the electrode assemblies and the thermal deformation structure are disposed within the housing. When the temperature of the thermal deformation structure is greater than or equal to a temperature threshold, the thermal deformation structure deforms and forms a flow channel for the internal gas circulation of the battery cell. Specifically, the thermal deformation structure can be disposed between the housing and the electrode assemblies to create a flow channel between the thermal deformation structure and the inner wall of the housing and / or the electrode assemblies. Alternatively, the number of electrode assemblies may be at least two, and the thermal deformation structure can be disposed between two adjacent electrode assemblies to form a flow channel between the thermal deformation structure and at least one adjacent electrode assembly. During normal operation of the battery cell, the temperature of the thermal deformation structure is below the temperature threshold, and the thermal deformation structure can remain in its initial state, maintaining a relatively small gap between the electrode assemblies and the housing and / or between two adjacent electrode assemblies. When thermal runaway occurs in the battery cell, the temperature of the battery cell rises until the temperature of the thermal deformation structure rises to or above the temperature threshold, at which point the thermal deformation structure deforms into a deformed shape and forms a flow channel. Gas generated by thermal runaway of the battery cell will preferentially flow to the area inside the casing where there are no electrode components, that is, preferentially flow into the flow channel. It can then be released through the explosion-proof structure of the battery cell, thereby reducing the impact of the battery cell electrode plates and the sparks generated by the impact, and reducing safety hazards.

[0030] Compared to existing technologies, the battery cell provided in this application controls whether the thermal deformation structure deforms by changing the temperature. After the thermal deformation structure deforms, a flow channel can be generated between the thermal deformation structure and the electrode assembly and / or the shell, thereby providing a path for the flow of thermal runaway gas to be released. This makes the ejection path of the thermal runaway gas controllable, ensuring that the electrode assembly is less affected by blows, reducing damage to the battery cell electrode sheets, improving safety performance, and extending service life.

[0031] The battery pack provided in this application includes at least one of the above-mentioned cells connected in series and parallel, so it also has the above-mentioned structure and beneficial effects. Other structures refer to the prior art and will not be described in detail here. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of the first type of battery cell disclosed in the embodiments of this application;

[0034] Figure 2 This is a schematic diagram of the structure of the second type of battery cell disclosed in the embodiments of this application;

[0035] Figure 3 This is a schematic diagram of the thermal deformation structure in its initial state as disclosed in an embodiment of this application;

[0036] Figure 4 This is a schematic diagram of a thermally deformed structure in a deformed state as disclosed in an embodiment of this application;

[0037] Figure 5 This is a schematic diagram of the structure of the third type of battery cell disclosed in the embodiments of this application. Figure 1 ;

[0038] Figure 6 This is a schematic diagram of the structure of the third type of battery cell disclosed in the embodiments of this application. Figure 2 ;

[0039] Figure 7 This is a schematic diagram of the structure of the fourth type of battery cell disclosed in the embodiments of this application. Figure 1 ;

[0040] Figure 8 This is a schematic diagram of the structure of the fourth type of battery cell disclosed in the embodiments of this application. Figure 2 ;

[0041] Figure 9 This is a schematic diagram of the structure of the fifth type of battery cell disclosed in the embodiments of this application. Figure 1 ;

[0042] Figure 10 This is a schematic diagram of the structure of the fifth type of battery cell disclosed in the embodiments of this application. Figure 2 ;

[0043] Figure 11 This is a schematic diagram of the structure of the sixth type of battery cell disclosed in the embodiments of this application. Figure 1 ;

[0044] Figure 12 This is a schematic diagram of the structure of the sixth type of battery cell disclosed in the embodiments of this application. Figure 2 ;

[0045] Figure 13 This is a schematic diagram of the structure of the seventh type of battery cell disclosed in the embodiments of this application. Figure 2 .

[0046] Among them, 100 is the electrode assembly, 200 is the thermal deformation structure, 210 is the first thermal deformation sheet, 220 is the second thermal deformation sheet, 230 is the third thermal deformation sheet, 300 is the housing, 310 is the thermal deformation plate, and 400 is the explosion-proof assembly. Detailed Implementation

[0047] The core of this application is to disclose a battery cell to improve battery safety.

[0048] Another key aspect of this application is the disclosure of a battery pack that includes the aforementioned battery cells.

[0049] Hereinafter, embodiments will be described with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the utility model as described in the claims. Additionally, the complete contents of the structures represented in the embodiments below are not limited to those necessary for the solution of the utility model as described in the claims. It should be noted that, for ease of description, only the parts relevant to the utility model are shown in the drawings. Unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0050] Combination Figures 1-13 The battery cell disclosed in this application includes a housing 300, an electrode assembly 100, and a thermal deformation structure 200. Both the electrode assembly 100 and the thermal deformation structure 200 are disposed inside the housing 300. When the temperature of the thermal deformation structure 200 is greater than or equal to a temperature threshold, the thermal deformation structure 200 deforms and forms a flow channel for the gas to circulate inside the battery cell.

[0051] It should be noted that the embodiments disclosed in this application do not limit whether the battery cell has other flow channels before the thermal deformation structure 200 undergoes thermal deformation. Before the thermal deformation structure 200 undergoes thermal deformation, the thermal deformation structure 200 itself, the thermal deformation structure 200 and the electrode assembly 100, or the thermal deformation structure 200 and the inner wall of the housing 300 may also have other flow channels. However, these flow channels generally cannot fully meet the requirements for gas flow inside the battery cell to achieve pressure relief through the explosion relief valve.

[0052] Specifically, the thermal deformation structure 200 can be disposed between the housing 300 and the electrode assembly 100 to create a flow channel between the thermal deformation structure 200 and the inner wall of the housing 300 and / or the electrode assembly 100, and / or, the number of electrode assemblies 100 is at least two, and the thermal deformation structure 200 can be disposed between two adjacent electrode assemblies 100 to form a flow channel between the thermal deformation structure 200 and at least one adjacent electrode assembly 100.

[0053] The electrode assembly 100 includes a positive electrode and a negative electrode. The housing 300 is filled with an electrolyte, which is also present between the positive and negative electrodes of the electrode assembly 100. The positive electrode, negative electrode, and electrolyte work together to charge and discharge. During normal operation of the battery cell, the temperature of the thermal deformation structure 200 is below the temperature threshold, and the thermal deformation structure 200 can remain in its initial state, so that a relatively small gap is maintained between the electrode assembly 100 and the housing 300 and / or between two adjacent electrode assemblies 100. When the battery cell experiences thermal runaway, the temperature of the battery cell rises until the temperature of the thermal deformation structure 200 rises to or above the temperature threshold. At this point, the thermal deformation structure 200 deforms into a deformed shape and forms a flow channel. The gas generated by thermal runaway of the battery cell (hereinafter referred to as thermal runaway gas) will preferentially flow to the position inside the housing 300 where the electrode assembly 100 is not installed, that is, preferentially flow into the flow channel. It can be released through the explosion-proof structure of the battery cell, thereby reducing the blow-out of the battery cell electrode and reducing the sparks generated by the blow-out, thus reducing safety hazards.

[0054] Compared to existing technologies, the battery cell disclosed in this application controls whether the thermal deformation structure 200 deforms by changing the temperature. After the thermal deformation structure 200 deforms, a flow channel can be generated between the thermal deformation structure 200 and the electrode assembly 100 and / or the housing 300, thereby providing a path for the flow of thermal runaway gas to be released. This makes the ejection path of the thermal runaway gas controllable, ensuring that the electrode assembly 100 is less affected by blows, reducing damage to the battery cell electrode sheets, improving safety performance, and extending service life.

[0055] The housing 300 can have a reserved space inside for the deformation of the thermally deformable structure 200, facilitating the switching between the initial and deformed states. Furthermore, the deformation of the thermally deformable structure 200 can, to some extent, deform the housing 300 and the electrode assembly 100 to accommodate the deformation of the thermally deformable structure 200. The thermally deformable structure 200 can be fabricated using shape memory alloys. Examples of shape memory alloys include, but are not limited to, nickel-titanium alloys, copper-aluminum-nickel alloys, copper-zinc-aluminum alloys, iron-platinum alloys, and nickel-aluminum alloys. The temperature threshold can be set to 80℃-120℃. By adjusting the composition of the shape memory alloy, the temperature threshold and the deformation time of the thermally deformable structure 200 can be controlled. The thermally deformable structure 200 fabricated using shape memory alloys can be directly triggered by temperature changes, ensuring stable and reliable operation. After temperature recovery, the shape can be restored, facilitating multiple uses. In some embodiments, the thermal deformation structure 200 is a mechanical structure having an initial state and a deformed state. This mechanical structure is controlled by a temperature control element disposed on the housing 300, which can detect the cell temperature and, when the cell temperature is greater than or equal to a temperature threshold, control the mechanical structure to switch from the initial state to the deformed state, thereby forming a flow channel in the thermal deformation structure 200. When the cell temperature is less than the temperature threshold, control the mechanical structure to return to the initial state. For example, this mechanical structure can switch between the initial state and the deformed state by means of extension or contraction.

[0056] In a specific embodiment disclosed in this application, combined with Figure 1 , Figure 5 and Figure 6 The thermal deformation structure 200 includes a first thermal deformation plate 210, which is disposed between two adjacent electrode assemblies 100. When the temperature of the first thermal deformation plate 210 is greater than or equal to a temperature threshold, the first thermal deformation plate 210 protrudes and deforms in the direction of at least one adjacent electrode assembly 100, forming a flow channel between it and the at least one adjacent electrode assembly 100. Specifically, when the temperature of the thermal deformation structure 200 is below the temperature threshold, the first thermal deformation plate 210 is straight; when the temperature of the thermal deformation structure 200 is greater than or equal to the temperature threshold, the first thermal deformation plate 210 is bent. The deformation of the first thermal deformation plate 210 can push the two adjacent electrode assemblies 100 away from each other, thereby widening the gap between them to form a flow channel, facilitating the passage of thermal runaway gas and pressure release. The structure is simple and highly safe. The first thermal deformation plate 210 includes, but is not limited to, flat plate components and mesh components, and is made of shape memory alloy. This type of component has a simple structure and small size, ensuring the energy density of the battery cell. Furthermore, the mesh component has the advantage of being lightweight and facilitates the flow of thermal runaway gas between the channels on both sides of the mesh component. Combined with... Figure 6 and Figure 13Under the deformation state, the deformation shape of the first thermal deformation sheet 210 includes, but is not limited to, deformation protruding to one side, bending deformation in an S-shape, etc.

[0057] Furthermore, to ensure the stable formation of the flow channel, in one embodiment, combined with Figures 2-4 The thermal deformation structure 200 also includes a second thermal deformation sheet 220, which is disposed between two adjacent electrode assemblies 100 and on one side of the first thermal deformation sheet 210. When the temperature of the first thermal deformation sheet 210 and the second thermal deformation sheet 220 is lower than the temperature threshold, both the first thermal deformation sheet 210 and the second thermal deformation sheet 220 are flat and attached to each other. When the temperature of the first thermal deformation sheet 210 and the second thermal deformation sheet 220 is greater than or equal to the temperature threshold, the first thermal deformation sheet 210 and the second thermal deformation sheet 220 bulge and deform in a direction away from each other to form a stable flow channel between the first thermal deformation sheet 210 and the second thermal deformation sheet 220, which facilitates the passage of thermal runaway gas and pressure release, and the structure is stable and reliable. The first thermal deformation plate 210 and the second thermal deformation plate 220 include, but are not limited to, flat plate components and mesh components, and are made of shape memory alloy. These components have a simple structure and small size, which can ensure the energy density of the battery cell. In addition, the mesh component has the advantage of light weight and facilitates the entry and exit of thermal runaway gas.

[0058] For example, Figure 7 and Figure 8 The present invention discloses a technical solution in which the first thermal deformation sheet 210 and the second thermal deformation sheet 220 are arranged opposite to each other in a shape memory alloy plate-like component. Under normal circumstances, the temperature of the thermal deformation structure 200 is less than the temperature threshold. The first thermal deformation sheet 210 and the second thermal deformation sheet 220 are placed parallel to each other and attached to each other. When the battery cell encounters an unexpected high temperature that leads to thermal runaway, the temperature of the thermal deformation structure 200 is greater than or equal to the temperature threshold. The first thermal deformation sheet 210 and the second thermal deformation sheet 220 are both deformed into an arc-shaped curved shape, and a cavity is formed between them. This cavity serves as the aforementioned flow channel, through which thermal runaway gas can preferentially pass, thereby reducing the possibility of thermal runaway gas passing through the inside of the electrode assembly 100 and reducing blown sparks, thus improving safety.

[0059] In a specific embodiment disclosed in this application, combined with Figure 7 and Figure 8The thermal deformation structure 200 includes a third thermal deformation sheet 230, which is disposed between the inner wall of the housing 300 and the electrode assembly 100. When the temperature of the third thermal deformation sheet 230 is below a temperature threshold, the third thermal deformation sheet 230 is straight, and there is a small gap between the inner wall of the housing 300 and the electrode assembly 100. When the temperature of the third thermal deformation sheet 230 is greater than or equal to the temperature threshold, the third thermal deformation sheet 230 is bent, specifically it can bulge into or out of the housing 300, or deform in an S-shape, to form a flow channel between the inner wall of the housing 300 and / or the electrode assembly 100. Figure 8 Regardless of whether the third thermal deformation plate 230 protrudes inward or outward from the housing 300, the gap between the third thermal deformation plate 230 and the housing 300 can be increased, forming a flow channel. A preferred arrangement is for the third thermal deformation plate 230 to protrude outward from the housing 300, facilitating direct entry of thermal runaway gas into the flow channel formed by the arc-shaped inner side of the third thermal deformation plate 230. This arrangement offers advantages such as smooth flow of thermal runaway gas and timely pressure release. The third thermal deformation plate 230 includes, but is not limited to, flat plate components and mesh components, and is made of shape memory alloy. Such components have a simple structure and small size, ensuring the energy density of the battery cell.

[0060] In a specific embodiment disclosed in this application, combined with Figure 9 and Figure 10 The housing 300 includes multiple enclosure plates that together form the internal space of the housing 300. At least one of the enclosure plates is a thermal deformation plate 310. When the temperature of the thermal deformation plate 310 is below a temperature threshold, the thermal deformation plate 310 is flat. When the temperature of the thermal deformation plate 310 is greater than or equal to the temperature threshold, the thermal deformation plate 310 protrudes outward from the housing 300, and a flow channel is formed between the thermal deformation plate 310 and the electrode assembly 100. By setting at least one side plate of the housing 300 to a structure that can switch between flat and protruding, space for thermal runaway gas release is provided while reducing the occupation of the internal space of the housing 300 and improving the energy density of the battery cell.

[0061] The housing 300 is typically a square housing, combined with Figure 11To facilitate the arraying and stacking of electrode assemblies 100 within the housing 300, a single electrode assembly 100 can be formed into a regular cubic structure through methods such as lamination, winding, or multi-core stacking, thereby fully utilizing the internal space of the housing 300 and increasing the energy storage density of the cell. Specifically, multiple electrode assemblies 100 can be arrayed and spaced apart within the housing 300 to form a plane, while simultaneously forming multiple regularly arranged flow channels for the arrangement of thermal deformation structures 200. In the height direction, the electrode assemblies 100 can be arranged as a single layer or stacked into multiple layers, and the aforementioned thermal deformation structures 200 are set between adjacent layers of electrode assemblies 100 to form flow channels for guiding the path of thermal runaway gas.

[0062] The scheme was further optimized to facilitate the flow of thermal runaway gas, combined with... Figure 7 and Figure 8 The dashed lines in the figure illustrate the gap between the positive and negative electrodes of the electrode assembly 100. When the electrode assembly 100 has a wound structure, the extension direction of the flow channel is perpendicular to the winding plane of the electrode assembly 100, allowing thermal runaway gas overflowing from between the positive and negative electrodes of the electrode assembly 100 to directly enter through the end of the flow channel formed by the thermal deformation structure 200, resulting in a shorter flow path and faster pressure release. When the electrode assembly 100 has a stacked structure, the extension direction of the flow channel is perpendicular to the stacking direction of the electrode assembly 100, allowing gas overflowing from between the positive and negative electrodes of the electrode assembly 100 to directly enter through the end of the flow channel formed by the thermal deformation structure 200, resulting in a shorter flow path, faster pressure release, and improved safety performance. The structures of multiple electrode assemblies 100 within a housing 300 can be identical or different.

[0063] The battery cell is depressurized via an explosion-proof component 400, which is mounted on the housing 300 and activates when the battery cell pressure is too high. In some embodiments, to prevent airflow at the explosion-proof component 400 from impacting the electrode assembly 100, the explosion-proof component 400 is positioned along the extension direction of the flow channel and communicates with the flow channel. Thermal runaway gas flowing within the flow channel can directly flow to the explosion-proof component 400 to release pressure, improving safety performance. The explosion-proof component 400 creates a complete and short pressure relief path for the battery cell, allowing for faster pressure release and preventing the impact on the positive and negative electrode plates caused by direct release of thermal runaway gas from the explosion-proof structure corresponding to the electrode assembly 100. The battery cell disclosed in this application provides path guidance for the emission of thermal runaway gas. When thermal runaway occurs, the gas generated by thermal runaway can preferentially be depressurized through the flow channel and smoothly discharged through the explosion-proof component 400, which greatly improves the safety performance of the battery cell and reduces the impact on the electrode assembly 100, thereby reducing the damage to the electrode sheet and extending the service life of the battery cell.

[0064] For example, the explosion-proof component 400 includes an explosion-proof valve and / or a deformation joint, and the types of explosion-proof valves include, but are not limited to, mechanical explosion-proof valves, electronic explosion-proof valves, and thermal explosion-proof valves. Combined with Figure 12 When subjected to pressure exceeding a preset value, the deformation seam is more prone to deformation and pressure release than other parts of the housing 300, thereby preventing explosions and improving safety performance. Furthermore, the deformation seam has a simple structure, low cost, and is easier to integrate with the flow channels formed by the arrayed electrode assemblies 100.

[0065] The various structures of the explosion-proof component 400 can be arranged on the same side or different sides of the housing 300. Preferably, the various structures of the explosion-proof component 400 are arranged on the same side of the housing 300, which facilitates the stacking or laying of multiple battery cells and their transportation.

[0066] Those skilled in the art will understand that, depending on the actual size of the battery cell, one flow channel may correspond to one or more explosion-proof valves. When one second gap corresponds to multiple explosion-proof valves, the multiple explosion-proof valves may be arranged at intervals to ensure the safety and explosion-proof performance of large-size battery cells.

[0067] The battery pack disclosed in this application includes at least one of the aforementioned cells connected in series and parallel, thus possessing the same structure and beneficial effects as described above. Other structures refer to existing technologies and will not be elaborated upon here. Specifically, when the battery pack includes one of the aforementioned cells, the cell is connected in series and parallel. When the battery pack includes multiple of the aforementioned cells, the multiple cells can be electrically connected using a series-parallel connection method, such as first connecting in series and then in parallel, or first connecting in parallel and then in series. The battery pack disclosed in this application includes, but is not limited to, battery packs, battery clusters, or other possible cell assembly configurations.

[0068] It should be noted that "multiple" in this application includes two, and "multi-layer" includes two layers. "Temperature" can be understood as "temperature of the environment".

[0069] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Specific technical means in some embodiments may be incorporated, in whole or in part, into another embodiment unless explicitly excluded by another embodiment. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electric cell, characterized by, include: Housing (300); An electrode assembly (100) is disposed within the housing (300); A heat-deformation structure (200) is disposed within the housing (300); When the temperature of the thermal deformation structure (200) is greater than or equal to a temperature threshold, the thermal deformation structure (200) deforms and forms a flow channel; The number of electrode assemblies (100) is at least two, and the thermal deformation structure (200) is disposed between two adjacent electrode assemblies (100); when the temperature of the thermal deformation structure (200) is greater than or equal to the temperature threshold, the thermal deformation structure (200) deforms and forms the flow channel between at least one adjacent electrode assembly (100).

2. The cell of claim 1, wherein, The thermal deformation structure (200) is disposed between the inner wall of the housing (300) and the electrode assembly (100); When the temperature of the thermal deformation structure (200) is greater than or equal to the temperature threshold, the thermal deformation structure (200) deforms and forms the flow channel between the inner wall of the housing (300) and / or the electrode assembly (100).

3. The cell of claim 1, wherein, The thermal deformation structure (200) includes a first thermal deformation plate (210), which is disposed between two adjacent electrode assemblies (100); When the temperature of the first heat-deformed sheet (210) is greater than or equal to the temperature threshold, the first heat-deformed sheet (210) protrudes and deforms in the direction of at least one adjacent electrode assembly (100), and forms the flow channel between the first heat-deformed sheet (210) and at least one adjacent electrode assembly (100).

4. The cell of claim 3, wherein, The thermal deformation structure (200) further includes a second thermal deformation sheet (220), which is disposed between two adjacent electrode assemblies (100) and on one side of the first thermal deformation sheet (210); When the temperature of the first heat-deformed sheet (210) and the second heat-deformed sheet (220) is greater than or equal to the temperature threshold, the first heat-deformed sheet (210) and the second heat-deformed sheet (220) bulge and deform in a direction away from each other, and the flow channel is formed between the first heat-deformed sheet (210) and the second heat-deformed sheet (220).

5. The cell of claim 1 wherein, The temperature threshold is 80℃-120℃; and / or, The thermal deformation structure (200) is made of a shape memory alloy, which includes at least one of nickel-titanium alloy, copper-aluminum-nickel alloy, copper-zinc-aluminum alloy, iron-platinum alloy, and nickel-aluminum alloy.

6. The cell of claim 1 wherein, The housing (300) includes a plurality of enclosure plates, at least one of which is a heat-deformation plate (310). When the temperature of the heat-deformed plate (310) is greater than or equal to the temperature threshold, the heat-deformed plate (310) deforms outward from the housing (300).

7. The cell of claim 1 wherein, The electrode assembly (100) has a wound structure, and the extension direction of the flow channel is perpendicular to the winding plane of the electrode assembly (100); or, The electrode assembly (100) has a stacked structure, and the extension direction of the flow channel is perpendicular to the stacking direction of the electrode assembly (100).

8. The cell of claim 1 wherein, An explosion-proof component (400) is provided on the housing (300), the explosion-proof component (400) is disposed in the extension direction of the flow channel and communicates with the flow channel.

9. A battery pack characterized by comprising: Includes at least one battery cell connected in series or parallel as described in any one of claims 1-8.

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