Cover plate assembly, battery cell shell, battery cell monomer, battery pack and vehicle

Abstract

The utility model relates to vehicle technical field especially relates to a cover plate subassembly, electric core shell, electric core single body, battery pack and vehicle. Cover plate subassembly includes cover plate main part, pole post subassembly and insulating component, and cover plate main part has pole post installation hole, and pole post subassembly part is located pole post installation hole, and pole post subassembly is used for with electric core electricity connection, and insulating component sets up between cover plate main part and pole post subassembly to with cover plate main part and pole post subassembly isolation insulation, pole post subassembly is provided with hot melt conducting piece, and hot melt conducting piece can be hot melting to with pole post subassembly and cover plate main part electricity conduction. Pole post subassembly is provided with hot melt conducting piece, after electric core single body thermal runaway, hot melt conducting piece can conduct pole post subassembly and cover plate main part under the action of high temperature after hot melting, and cover plate main part plays the role of connecting piece to conduct the current produced in the normal work of electric core single body in the same battery pack, and further avoids the breakpoint of battery pack and leads to the battery pack current unable to conduct.

Description

Technical Field

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

[0002] A battery pack consists of multiple individual cells connected in series and parallel via connecting plates. When individual cells are connected in series via connecting plates, thermal runaway in any one of the individual cells will render the battery pack unusable.

[0003] To address this, related technologies offer a solution for short circuits in individual battery cells. Adjacent battery cells are connected via a connecting plate assembly. When the cells are in normal operation, the connecting plate assembly connects adjacent cells. If one cell fails, the assembly connects the two electrodes of the failed cell in addition to connecting adjacent cells. However, this connecting plate assembly increases overall weight compared to conventional connecting plates. When the battery cell's terminals and explosion-proof valve are on the same side, to make the battery pack more compact, the connecting plate assembly is usually positioned facing the side of the battery cell. This connection plate assembly can obstruct the explosion-proof valve, hindering its venting.

[0004] Therefore, there is an urgent need for a battery cell casing to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this utility model is to provide a cover plate assembly, a cell housing, a cell, a battery pack, and a vehicle that can ensure that the out-of-control cell remains conductive after it goes out of control, without blocking the explosion-proof valve.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] In a first aspect, a cover plate assembly is provided, including a cover plate body, a pole assembly, and an insulating assembly. The cover plate body has a pole mounting hole, the pole assembly is partially located in the pole mounting hole, the pole assembly is used for electrical connection with a battery cell, and the insulating assembly is disposed between the cover plate body and the pole assembly to isolate and insulate the cover plate body from the pole assembly.

[0008] The electrode assembly is provided with a heat-melting conductive element, which can be heated and melted to electrically connect the electrode assembly to the cover plate body.

[0009] As an optional technical solution for the above-mentioned cover plate assembly, along the direction perpendicular to the thickness of the cover plate body, the projection of the hot-melt conductive member on the end face of the cover plate body at least partially overlaps with the pole mounting hole.

[0010] As an optional technical solution for the above-mentioned cover plate assembly, the pole post assembly is provided with a receiving groove facing the cover plate body, and the hot melt conductive component is installed in the receiving groove.

[0011] As an optional technical solution for the aforementioned cover plate assembly, the receiving groove is an annular groove; or,

[0012] The number of receiving slots is multiple, and the multiple receiving slots are arranged circumferentially along the pole post assembly.

[0013] As an optional technical solution for the above-mentioned cover plate assembly, the insulating component, the electrode component, and the cover plate body form a receiving space that can accommodate the molten hot-melt conductive component, and the receiving space is closed on the side facing the battery cell.

[0014] As an optional technical solution for the aforementioned cover plate assembly, the accommodating space includes a first sub-space, a second sub-space, and a third sub-space. The insulating assembly includes a first insulating element and a second insulating element. The cover plate body is located between the first insulating element and the second insulating element. The first insulating element is provided with a first through hole. A portion of the pole post assembly is located within the first through hole. The first sub-space is formed between the hole wall of the first through hole and the outer peripheral wall of the pole post assembly. The second sub-space is formed between the hole wall of the pole post mounting hole and the outer peripheral wall of the pole post assembly. The second insulating element is provided with a second through hole. A portion of the pole post assembly is located within the second through hole. The third sub-space is formed between the hole wall of the second through hole and the side wall of the pole post assembly. The third sub-space is closed on the side facing the battery cell.

[0015] As an optional technical solution for the aforementioned cover plate assembly, the volume of the first subspace is smaller than the volume of the second subspace, and the volume of the second subspace is smaller than the volume of the third subspace.

[0016] As an optional technical solution for the aforementioned cover plate assembly, the volume of the hot-melt conductive element is greater than the volume of the third subspace.

[0017] As an optional technical solution for the above-mentioned cover plate assembly, the accommodating space includes a first sub-space and a second sub-space, the insulating assembly includes a first insulating member and a second insulating member, the cover plate body is located between the first insulating member and the second insulating member, the first insulating member is provided with a first through hole, a portion of the pole post assembly is located in the first through hole, the first sub-space is formed between the hole wall of the first through hole and the outer peripheral wall of the pole post assembly, the hole wall of the pole post mounting hole and the side wall of the pole post assembly form the second sub-space, and the second sub-space is closed on the side facing the battery cell.

[0018] As an optional technical solution for the above-mentioned cover plate assembly, the melting point of the hot-melt conductive component is 150℃~250℃.

[0019] As an optional technical solution for the aforementioned cover plate assembly, the hot-melt conductive component includes a tin alloy component; and / or,

[0020] The hot-melt conductive component includes an indium alloy component; and / or,

[0021] The hot-melt conductive component includes a tin-indium alloy component; and / or,

[0022] The hot-melt conductive component includes an indium metal component; and / or,

[0023] The hot-melt conductive component includes a tin metal component.

[0024] In a second aspect, a cell housing is provided, comprising the cover assembly described in any of the above embodiments.

[0025] Thirdly, a battery cell unit is provided, including a battery cell and a battery cell housing as described in the above-mentioned scheme, wherein the battery cell is disposed within the space enclosed by the battery cell housing.

[0026] Fourthly, a battery pack is provided, comprising a plurality of battery cells as described in the above-described scheme, wherein the plurality of battery cells are connected in series via connecting pieces.

[0027] Fifthly, a vehicle is provided that includes the battery pack described in the above-described solution.

[0028] This utility model has at least the following beneficial effects:

[0029] The present invention provides a cover plate assembly, a cell housing, a cell, a battery pack, and a vehicle. The terminal assembly is equipped with a thermoplastic conductive component. After thermal runaway of a cell, the thermoplastic conductive component melts under high temperature, enabling it to conduct electricity between the terminal assembly and the cover plate body. The cover plate body acts as a connecting piece to conduct the current generated by the normally functioning cell in the same battery pack, thereby preventing the battery pack from failing to conduct current due to a break in the battery pack. The terminal assembly does not require additional changes to the shape of the connecting piece, avoiding an increase in the overall weight of the connecting piece. In addition, the explosion-proof valve on the cell housing is not blocked by the connecting piece, ensuring that the cell housing can vent normally. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0031] Figure 1 A partial cross-sectional view of the battery cell housing provided in an embodiment of this utility model;

[0032] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0033] Figure 3 for Figure 2 A magnified view of a section at point B.

[0034] In the picture:

[0035] 1. Cover plate body; 2. Pole post; 3. Conductive component; 4. Hot melt conductive component; 5. First insulating component; 6. Second insulating component; 100. Accommodation space; 101. First subspace; 102. Second subspace; 103. Third subspace. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0037] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0040] In order to enable a battery with series-connected cells to function normally after the thermal failure of any one cell, this invention provides a cover plate assembly that can ensure the normal operation of the battery pack without increasing the weight of the connecting pieces and without obstructing the explosion-proof valve.

[0041] like Figure 1 and Figure 2 As shown, the cover plate assembly includes a cover plate body 1, a pole assembly, and an insulation assembly. The cover plate body 1 has a pole mounting hole. The pole assembly is located in the pole mounting hole and is used to electrically connect with the battery cell. The pole assembly is provided with a thermoplastic conductive element 4, which can be heated and melted to electrically connect the pole assembly and the cover plate body 1. The insulation assembly is disposed between the cover plate body 1 and the pole assembly to isolate and insulate the cover plate body 1 from the pole assembly.

[0042] The cover plate assembly provided in this embodiment of the utility model has a heat-fused conductive component 4. After the thermal runaway of a single cell, the heat-fused conductive component 4 melts under high temperature and can connect the terminal post assembly and the cover plate body 1. The cover plate body 1 acts as a connecting piece to conduct the current generated by the normally operating cell in the same battery pack, thereby avoiding the battery pack from having a break and the battery pack current not being able to conduct. The terminal post assembly does not need to change the shape of the connecting piece, avoiding the increase in the overall weight of the connecting piece. In addition, the explosion-proof valve on the cell housing will not be blocked by the connecting piece, ensuring that the cell housing can vent normally.

[0043] In some embodiments, along the thickness direction of the cover plate body 1, the projection of the hot melt conductive element 4 on the end face of the cover plate body 1 at least partially overlaps with the pole mounting hole.

[0044] It is understandable that the terminal mounting holes of the cover plate body 1 are at least partially positioned opposite to the hot-melt conductive component 4. This allows the molten, liquid hot-melt conductive component 4 to enter the terminal mounting holes and contact the cover plate body 1 and the conductive component 3. The hot-melt conductive component 4 then connects the cover plate body 1 and the conductive component 3, enabling the cover plate to function as a connecting piece and providing a conductive path for other interconnected battery cells operating normally. For example, the projection of the hot-melt conductive component 4 on the end face of the cover plate body 1 overlaps with the terminal mounting holes. This allows the molten hot-melt conductive component 4 to drip directly, connecting the cover plate body 1 and the conductive component 3, avoiding obstruction by insulating components and improving conductivity.

[0045] In some embodiments, the electrode assembly includes an electrode 2 and a conductive element 3, with the conductive element 3 partially located in the electrode mounting hole, and the electrode 2 connected to the conductive element 3 to conduct electricity with the battery cell.

[0046] For example, the hot melt conductive element 4 is disposed on the side of the pole post 2 facing the cover plate body 1. The hot melt conductive element 4 can be disposed on the surface of the cover plate body 1 or inside the cover plate body 1.

[0047] Of course, in some other embodiments, the hot-melt conductive element 4 is disposed along the outer peripheral wall of the conductive element 3, the hot-melt conductive element 4 and the conductive element 3 are integral structures, the hot-melt conductive element 4 is attached to the outer peripheral wall of the conductive element 3, and the hot-melt conductive element 4 does not contact the cover plate body 1 before melting.

[0048] As can be seen from the above scheme, regardless of the position of the hot melt conductive part 4 in the pole assembly, it is necessary to ensure that the projection of the hot melt conductive part 4 on the end face of the cover plate body 1 at least partially overlaps with the pole mounting hole, so as to ensure that the conductive part 4 after melting is electrically connected to the cover plate body 1 through the pole mounting hole.

[0049] In some embodiments, the pole assembly has a receiving groove facing the cover plate body 1, and the hot-melt conductive part 4 is installed in the receiving groove. The receiving groove is used to provide storage space for the hot-melt conductive part 4, avoiding the hot-melt conductive part 4 being placed on the side of the pole 2 facing the cover plate body 1, thus ensuring that the overall height of the pole 2 remains unchanged.

[0050] The receiving groove can be set on the side of the pole post 2 facing the cover plate body 1, or it can be set on the outer peripheral wall of the conductive part 3 facing the cover plate body 1. It should be noted that the hot melt conductive part 4 does not contact the cover plate body 1 when the battery cell is working normally.

[0051] For example, the cross-section of the receiving groove in the vertical plane passing through the central axis of the pole post 2 can be rectangular or trapezoidal. When the cross-section of the receiving groove in the vertical plane passing through the central axis of the pole post 2 is rectangular, it facilitates the injection of the hot-melt conductive part 4 into the receiving groove during the manufacturing process. After melting, the hot-melt conductive part 4 will gradually solidify as the ambient temperature drops, thus forming a solid state, that is, the hot-melt conductive part 4 hardens after cooling. When the cross-section of the receiving groove in the vertical plane passing through the central axis of the pole post 2 is trapezoidal, from top to bottom, the long side of the cross-section is above the short side of the cross-section. This can improve the limiting ability of the hot-melt conductive part 4 after it cools and hardens, preventing the hardened hot-melt conductive part 4 from detaching from the receiving groove.

[0052] In some embodiments, the receiving groove is an annular structure groove. It is understood that the receiving groove is coaxially arranged with the pole post 2. The annular structure groove can improve the melting efficiency of the hot melt conductive part 4, so that the hot melt conductive part 4 will melt and drip into the pole post mounting hole no matter where it is subjected to high temperature, thus connecting the cover plate body 1 and the conductive part 3.

[0053] When the receiving groove is provided on the conductive element 3, the conductive element 3 is positioned with the receiving groove facing the pole mounting hole of the cover plate body 1.

[0054] In other embodiments, there are multiple receiving slots, which are arranged along the circumference of the pole post 2 or along the axis of the outer peripheral wall of the conductive element 3. The shape of the receiving slots can be rectangular, semi-circular, trapezoidal, etc. The arrangement of multiple receiving slots along the circumference of the pole post 2 allows the heat-melting conductive element 4 to melt and drip into the pole post mounting hole regardless of its location when exposed to high temperature, thus connecting the cover plate body 1 and the conductive element 3.

[0055] In some embodiments, the ratio of the depth of the receiving groove to the height of the pole post 2 is 0.3 to 0.7. For example, the ratio of the depth of the receiving groove to the height of the pole post 2 is 0.3, 0.4, 0.5, 0.6, or 0.7. This allows the receiving groove to have sufficient space to accommodate the thermoplastic conductive element 4, ensuring the total number of thermoplastic conductive elements 4 without reducing the strength of the pole post 2. For example, when the ratio of the depth of the receiving groove to the height of the pole post 2 is 0.3, the strength of the pole post 2 is ensured while maintaining conductivity between the cover plate body 1 and the conductive element 3. When the ratio of the depth of the receiving groove to its height is 0.7, it provides sufficient height for the thermoplastic conductive element 4, increasing the total number of thermoplastic conductive elements 4, and also ensuring the strength of the pole post 2.

[0056] In other embodiments, the ratio of the depth of the receiving groove to the diameter of the conductive element 3 is 0.3 to 0.7. For example, the depth of the receiving groove to the height of the conductive element 3 is between 0.3, 0.4, 0.5, 0.6, or 0.7, so that the receiving groove has enough space to accommodate the thermoplastic conductive element 4, ensuring the total amount of thermoplastic conductive element 4, and without reducing the strength of the conductive element 3.

[0057] In some embodiments, the insulating component, the terminal assembly, and the cover body 1 form a receiving space 100 capable of accommodating the molten hot-melt conductive element 4, and the receiving space 100 is closed on the side facing the battery cell. The closure of the receiving space 100 on the side facing the battery cell can prevent the molten hot-melt conductive element 4 from flowing out of the receiving space 100. In addition, the receiving space 100 provides space for the molten hot-melt conductive element 4 to contact the cover body 1 and the terminal assembly, so that the cover body 1 functions as a connecting piece.

[0058] In some embodiments, such as Figures 1 to 3 As shown, the insulation assembly includes a first insulating element 5 and a second insulating element 6, and the cover plate body 1 is located between the first insulating element 5 and the second insulating element 6.

[0059] For example, both the first insulating element 5 and the second insulating element 6 are plate-shaped structures.

[0060] like Figure 3 As shown, the accommodating space 100 includes a first subspace 101, a second subspace 102, and a third subspace 103. The first insulating member 5 is provided with a first through hole, and a portion of the pole assembly is located within the first through hole. The first subspace 101 is formed between the hole wall of the first through hole and the outer peripheral wall of the pole assembly. The second subspace 102 is formed between the hole wall of the pole mounting hole and the outer peripheral wall of the pole assembly. The second insulating member 6 is provided with a second through hole, and a portion of the pole assembly is located within the second through hole. The third subspace 103 is formed between the hole wall of the second through hole and the side wall of the pole assembly. The third subspace 103 is closed on the side facing the battery cell.

[0061] Specifically, the first insulating member 5 is disposed in non-contact with the conductive member 3. The first insulating member 5 is provided with a first through hole, and a portion of the conductive member 3 is located within the first through hole. A first sub-space 101 is formed between the hole wall of the first through hole, the side wall of the electrode post 2 facing the cover plate body 1, and the outer peripheral wall of the conductive member 3. A second sub-space 102 is formed between the hole wall of the electrode post mounting hole and the outer peripheral wall of the conductive member 3. The second insulating member 6 is provided with a second through hole, and a portion of the conductive member 3 is located within the second through hole. A third sub-space 103 is formed between the hole wall of the second through hole and the side wall of the conductive member 3. The third sub-space 103 is closed on the side facing the battery cell. It should be noted that the conductive member 3 includes a conductive body and a limiting part. The side wall of the conductive member 3 includes the outer peripheral wall of the conductive body and the side wall of the limiting part facing the electrode post 2.

[0062] In some embodiments, the volume of the first subspace 101 is smaller than the volume of the second subspace 102, and the volume of the second subspace 102 is smaller than the volume of the third subspace 103. This arrangement ensures that the molten hot-melt conductive element 4 flows smoothly into the third subspace 103, thereby ensuring that the hot-melt conductive element 4 connects the conductive element 3 and the cover plate body 1.

[0063] In some embodiments, the volume of the heat-melting conductive element 4 is greater than the volume of the third subspace 103. It is understood that, ideally, the heat-melting conductive element 4 can fill the third subspace 103 after melting and can be partially located in the second subspace 102. This allows the heat-melting conductive element 4 to flow into the third subspace 103 and the second subspace 102 to connect the cover plate body 1 and the conductive element 3, thereby connecting the cover plate body 1 and the conductive element 3 and acting as a connecting piece.

[0064] In some other embodiments, the accommodating space 100 includes a first subspace 101 and a second subspace 102. An insulating assembly includes a first insulating element 5 and a second insulating element 6. A cover plate body 1 is located between the first insulating element 5 and the second insulating element 6. The first insulating element 5 is provided with a first through hole. A portion of the electrode assembly is located within the first through hole. A first subspace 101 is formed between the hole wall of the first through hole and the outer peripheral wall of the electrode assembly. A second subspace 102 is formed between the hole wall of the electrode mounting hole and the side wall of the electrode assembly. The second subspace 102 is closed on the side facing the battery cell.

[0065] Specifically, the accommodating space 100 includes a first subspace 101 and a second subspace 102. The insulating component includes a first insulating element 5 and a second insulating element 6. The cover plate body 1 is located between the first insulating element 5 and the second insulating element 6. The first insulating element 5 is provided with a first through hole. A portion of the conductive element 3 is located in the first through hole. The first subspace 101 is formed between the hole wall of the first through hole and the outer peripheral wall of the conductive element 3. The hole wall of the pole mounting hole and the side wall of the conductive element 3 form a second subspace 102. The second subspace 102 is closed on the side facing the battery cell.

[0066] It is understandable that a first subspace 101 is formed between the first insulating component 5 and the conductive component 3, while the cover plate body 1 is not in contact with the conductive component 3. Thus, a second subspace 102 is formed between the cover plate body 1 and the conductive component 3. The first subspace 101 and the second subspace 102 are connected, allowing the heat-melting conductive component 4 to enter the second subspace 102 through the first subspace 101 after melting, thereby connecting the cover plate body 1 and the conductive component 3 and making the cover plate body 1 act as a connecting piece.

[0067] For example, the conductive component 3 includes a pole post rivet with a limiting part at the bottom. The limiting part of the pole post rivet is attached to the bottom surface of the second insulating component 6 and forms a third subspace 103 to increase the connection area between the conductive component 3 and the cover plate body 1 through the molten hot melt conductive component 4, thereby improving the stability of the connection between the two and preventing false connections.

[0068] It is understandable that the lower part of the pole post rivet, the part of the pole post rivet located in the second through hole, and the hole wall of the second through hole form a third subspace 103. When the molten hot melt conductive part 4 enters the third subspace 103, the lower part of the pole post rivet and the part of the pole post rivet located in the second through hole both come into contact with the molten hot melt conductive part 4, thereby increasing the connection area between the conductive part 3 and the cover plate body 1, improving the conductivity between the conductive part 3 and the cover plate body 1, and thus avoiding the conductive part 3 and the cover plate body 1 from being loosely connected.

[0069] In some embodiments, the melting point of the heat-fused conductive element 4 is 150°C to 250°C. For example, the melting point of the heat-fused conductive element 4 is 150°C, 160°C, 170°C, 180°C, 190°C, 200°C, 210°C, 220°C, 230°C, 240°C, or 250°C. When the melting point of the heat-fused conductive element 4 is 150°C, it can melt in time after the thermal runaway of a single battery cell, so as to connect the cover plate body 1 with the conductive element 3, thereby ensuring that other battery cells can work normally. When the melting point of the heat-fused conductive element 4 is 250°C, it can prevent accidental melting of the battery cell when the overall temperature of the battery pack is high and the battery cell has not yet experienced thermal failure, thereby improving the stability of the heat-fused conductive element 4.

[0070] In some embodiments, the heat-fused conductive element 4 includes a tin metal element or an indium metal element. The tin metal element has a low melting point and can melt at high temperatures. In addition, the tin metal element has a low density and will not increase the weight of the battery cell. Furthermore, the tin metal element has good conductivity and can effectively transmit current, ensuring that the current is conducted from the cover plate body 1 to the conductive element 3. The indium metal element has a low melting point and can melt at high temperatures, allowing the current to be conducted from the cover plate body 1 to the conductive element 3.

[0071] In some other embodiments, the hot-melt conductive element 4 includes a tin alloy element. The tin alloy element has a low melting point and can melt in a high-temperature environment. In addition, the tin alloy element has a low density and will not increase the weight of the battery cell. Furthermore, the tin alloy element has good conductivity and can effectively transmit current, ensuring that the current is conducted from the cover plate body 1 to the conductive element 3.

[0072] In some other embodiments, the hot-melt conductive element 4 includes an indium alloy element with a low melting point that can melt at high temperatures, allowing current to be conducted from the cover plate body 1 to the conductive element 3.

[0073] In some other embodiments, the hot-melt conductive element 4 includes a tin-indium alloy element. The indium alloy element has a low melting point and can melt at high temperatures. In addition, the tin-indium alloy element has good electrical conductivity, allowing current to be conducted from the cover plate body 1 to the conductive element 3.

[0074] This embodiment also provides a battery cell housing, including the cover plate assembly provided by this utility model.

[0075] Since the cell housing includes a cover plate assembly and the terminal assembly is equipped with a thermally fused conductive element 4, after the cell cell undergoes thermal runaway, the thermally fused conductive element 4 melts under high temperature and can connect the terminal assembly and the cover plate body 1. The cover plate body 1 acts as a connecting piece to conduct the current generated by the normally operating cell cell in the same battery pack, thereby preventing the battery pack from failing to conduct current due to a break in the battery pack. The terminal assembly does not need to change the shape of the connecting piece, thus avoiding an increase in the overall weight of the connecting piece. In addition, the explosion-proof valve on the cell housing will not be blocked by the connecting piece, ensuring that the cell housing can vent normally.

[0076] This embodiment also provides a single battery cell, including a battery cell and a battery cell housing provided by this utility model, wherein the battery cell is disposed within the space enclosed by the housing.

[0077] Since the battery cell includes a battery cell housing and the terminal assembly is equipped with a thermally fused conductive element 4, after the battery cell experiences thermal runaway, the thermally fused conductive element 4 melts under high temperature and can connect the terminal assembly to the cover plate body 1. The cover plate body 1 acts as a connecting piece to conduct the current generated by the normally operating battery cell in the same battery pack, thereby preventing the battery pack from failing to conduct current due to a break in the battery pack. The terminal assembly does not need to change the shape of the connecting piece, thus avoiding an increase in the overall weight of the connecting piece. In addition, the explosion-proof valve on the battery cell housing will not be blocked by the connecting piece, ensuring that the battery cell housing can vent normally.

[0078] This embodiment also provides a battery pack, including at least two individual battery cells provided in this embodiment. These individual battery cells can be wound batteries or stacked batteries. The individual battery cells can be connected in series, parallel, or a series-parallel connection.

[0079] Since the battery pack includes individual battery cells, the battery cell housing provided in this embodiment of the invention has a thermoplastic conductive element 4 on the terminal assembly. After thermal runaway of the individual battery cell, the thermoplastic conductive element 4 melts under high temperature and can connect the terminal assembly and the cover plate body 1. The cover plate body 1 acts as a connecting piece to conduct the current generated by the normally operating battery cell in the same battery pack, thereby avoiding the battery pack from having a break and the battery pack current not being able to conduct. The terminal assembly does not need to change the shape of the connecting piece, avoiding an increase in the overall weight of the connecting piece. In addition, the explosion-proof valve on the battery cell housing will not be blocked by the connecting piece, ensuring that the battery cell housing can vent normally.

[0080] This embodiment also provides a vehicle, including the battery pack provided in this embodiment.

[0081] Since the vehicle includes individual battery cells, the battery cell housing provided in this embodiment of the utility model has a thermoplastic conductive element 4 on the terminal assembly. After thermal runaway of the individual battery cell, the thermoplastic conductive element 4 melts under high temperature and can connect the terminal assembly and the cover plate body 1. The cover plate body 1 acts as a connecting piece to conduct the current generated by the normally operating individual battery cell in the same battery pack, thereby avoiding the battery pack from having a break and the battery pack current not being able to conduct. The terminal assembly does not need to change the shape of the connecting piece, avoiding an increase in the overall weight of the connecting piece. In addition, the explosion-proof valve on the battery cell housing will not be blocked by the connecting piece, ensuring that the battery cell housing can vent normally.

[0082] Furthermore, the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A cover plate assembly, characterized in that, The device includes a cover plate body (1), a pole assembly, and an insulation assembly. The cover plate body (1) has a pole mounting hole. The pole assembly is partially located in the pole mounting hole and is used to electrically connect with the battery cell. The insulation assembly is disposed between the cover plate body (1) and the pole assembly to isolate and insulate the cover plate body (1) from the pole assembly. The pole assembly is provided with a heat-melting conductive element (4), which can be heated and melted to electrically connect the pole assembly with the cover plate body (1).

2. The cover plate assembly according to claim 1, characterized in that, Along the thickness direction perpendicular to the cover plate body (1), the projection of the hot melt conductive element (4) on the end face of the cover plate body (1) at least partially overlaps with the pole mounting hole.

3. The cover plate assembly according to claim 1, characterized in that, The pole assembly is provided with a receiving groove facing the cover plate body (1), and the hot melt conductive part (4) is installed in the receiving groove.

4. The cover plate assembly according to claim 3, characterized in that, The receiving groove is an annular structure groove; or, The number of receiving slots is multiple, and the multiple receiving slots are arranged circumferentially along the pole post assembly.

5. The cover plate assembly according to any one of claims 1-4, characterized in that, The insulating component, the pole component, and the cover plate body (1) form a receiving space (100) capable of accommodating the molten hot-melt conductive component (4), and the receiving space (100) is closed on one side facing the battery cell.

6. The cover plate assembly according to claim 5, characterized in that, The accommodating space includes a first subspace (101), a second subspace (102), and a third subspace (103). The insulating assembly includes a first insulating element (5) and a second insulating element (6). The cover plate body (1) is located between the first insulating element (5) and the second insulating element (6). The first insulating element (5) is provided with a first through hole. A portion of the pole assembly is located within the first through hole. The first subspace (101) is formed between the hole wall of the first through hole and the outer peripheral wall of the pole assembly. The second subspace (102) is formed between the hole wall of the pole mounting hole and the outer peripheral wall of the pole assembly. The second insulating element (6) is provided with a second through hole. A portion of the pole assembly is located within the second through hole. The third subspace (103) is formed between the hole wall of the second through hole and the side wall of the pole assembly. The third subspace (103) is closed on the side facing the battery cell.

7. The cover plate assembly according to claim 6, characterized in that, The volume of the first subspace (101) is smaller than the volume of the second subspace (102), and the volume of the second subspace (102) is smaller than the volume of the third subspace (103).

8. The cover plate assembly according to claim 6 or 7, characterized in that, The volume of the hot-melt conductive component (4) is greater than the volume of the third subspace (103).

9. The cover plate assembly according to claim 5, characterized in that, The accommodating space (100) includes a first subspace (101) and a second subspace (102). The insulating assembly includes a first insulating element (5) and a second insulating element (6). The cover plate body (1) is located between the first insulating element (5) and the second insulating element (6). The first insulating element (5) is provided with a first through hole. A portion of the pole assembly is located in the first through hole. The first subspace (101) is formed between the hole wall of the first through hole and the outer peripheral wall of the pole assembly. The hole wall of the pole mounting hole and the side wall of the pole assembly form the second subspace (102). The second subspace (102) is closed on the side facing the battery cell.

10. The cover plate assembly according to any one of claims 1-4, characterized in that, The melting point of the hot melt conductive component (4) is 150℃~250℃.

11. A battery cell casing, characterized in that, Includes the cover plate assembly as described in any one of claims 1-10.

12. A single battery cell, characterized in that, It includes a battery cell and a battery cell housing as described in claim 11, wherein the battery cell is disposed within the space enclosed by the battery cell housing.

13. A battery pack, characterized in that, It includes at least two battery cells as described in claim 12.

14. A vehicle, characterized in that, Includes the battery pack as described in claim 13.

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