Battery assembly and electric equipment

Abstract

The utility model relates to the technical field of secondary batteries, and discloses a battery assembly and electric equipment, the battery assembly comprises a shell structure, at least one side surface of the shell structure is provided with an anti-explosion valve, and the interior of the shell structure is enclosed to form a hollow cavity; the pole group is arranged in the hollow cavity; the supporting plate is supported between the side face, provided with the anti-explosion valve, of the shell structure and the pole group; the insert is connected with the supporting plate, and the insert is also located between the side face, provided with the anti-explosion valve, of the shell structure and the pole group; the melting point of the insert is higher than the melting point of the supporting plate and the exhaust temperature of the battery assembly during thermal runaway. According to the battery assembly provided by the utility model, when thermal runaway occurs in the battery core, even if the supporting plate is deformed and melted in a short time, the insert can still be ensured to be positioned between the side surface of the shell structure, which is provided with the anti-explosion valve, and the pole group, so that the supporting effect on the pole group is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of secondary batteries, in particular to a battery assembly and electrical equipment. Background Art

[0002] As lithium-ion battery technology matures, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the performance and safety of lithium-ion batteries are increasing. The side panel structure is an important component to ensure battery safety and prevent thermal runaway, and its structural design is crucial to battery safety.

[0003] In the related art, the side panel structure is mostly made of plastic (such as PP, PC, etc.). Although these materials are corrosion-resistant, they are not resistant to high temperatures. When thermal runaway occurs inside the battery cell, they will deform and melt in a short time. As a result, the supporting function of the electrode group is lost, causing the electrode group to shift under the action of internal air pressure, blocking the explosion-proof holes, and easily causing side spray or explosion, posing a safety hazard. If the side panel structure is replaced with a high-temperature resistant material as a whole, the cost of the structural parts will increase significantly, making it difficult to achieve mass production. Utility Model Content

[0004] In view of this, the utility model provides a battery assembly and electrical equipment to solve the problem that the side plate structure is easily deformed and melted when thermal runaway occurs inside the battery cell, thereby losing its supporting function for the electrode group.

[0005] In a first aspect, the utility model provides a battery assembly, comprising:

[0006] A shell structure, wherein at least one side of the shell structure is provided with an explosion-proof valve, and the shell structure is enclosed inside to form a hollow cavity;

[0007] A pole group is disposed in the hollow cavity;

[0008] A support plate, supported between the side of the shell structure provided with the explosion-proof valve and the pole group;

[0009] An insert is connected to the support plate and is also located between the side of the shell structure where the explosion-proof valve is provided and the pole group;

[0010] The melting point of the insert is higher than the melting point of the support plate, and the melting point of the insert is higher than the exhaust temperature of the battery assembly during thermal runaway.

[0011] Beneficial effect: The battery assembly provided by the embodiment of the utility model supports the support plate between the side of the outer shell structure provided with the explosion-proof valve and the pole group, and further arranges an insert so that the insert is also located between the side of the outer shell structure provided with the explosion-proof valve and the pole group; the melting point of the insert is higher than the melting point of the support plate, and the melting point of the insert is higher than the exhaust temperature of the battery assembly during thermal runaway, so that when thermal runaway occurs inside the battery cell, even if the support plate will deform and melt in a short time, the insert can still be guaranteed to be between the side of the outer shell structure provided with the explosion-proof valve and the pole group, thereby ensuring the support effect on the pole group, avoiding displacement of the pole group under the action of internal air pressure, preventing blockage of the explosion-proof valve, providing sufficient airway space, ensuring smooth discharge of airflow, and reducing safety hazards.

[0012] In an optional embodiment, the insert is arranged on a side of the support plate facing the outer shell structure.

[0013] Beneficial effect: By arranging the insert on the side of the support plate facing the outer shell structure, the insert can be directly abutted against the outer shell structure. When the support plate melts, the insert can be ensured to be always in contact with the outer shell structure, avoiding slippage of the insert and preventing gas path blockage caused by misalignment.

[0014] In an optional embodiment, a plurality of inserts are arranged at intervals along the extension direction of the support plate.

[0015] Beneficial effect: Multiple inserts are arranged at intervals along the extension direction of the support plate, so that multiple points of the electrode group can abut against the inserts, ensuring that multiple positions of the electrode group along the extension direction can be supported, providing sufficient airway space, and ensuring smooth discharge of airflow.

[0016] In an optional embodiment, along a plane perpendicular to the support plate, the total area of ​​the plurality of inserts is F, and satisfies F≥S / 8, wherein F=N*X*Y, wherein N is the number of inserts, S is the area of ​​the side of the shell structure on which the explosion-proof valve is provided, X is the width of a single insert, and Y is the length of a single insert.

[0017] Beneficial effect: By limiting the total area of ​​multiple inserts to F≥S / 8, it is possible to ensure that the inserts provide sufficient support to the electrode group, so that multiple positions of the electrode group along the extension direction can be supported, providing sufficient airway space to ensure smooth discharge of airflow.

[0018] In an optional embodiment, the width X of the insert is ≥ 1 / 3L, wherein L is the width of the support plate parallel to the width direction of the insert.

[0019] Beneficial effect: By limiting the width of the insert to X≥1 / 3L, after thermal runaway occurs, even if the support plate melts, the insert can still have enough contact space when supporting the electrode group, ensuring that the support area of ​​the insert to the electrode group is more balanced and avoiding the tilting of the electrode group. At the same time, it is prevented that the too narrow insert will not cause indentation on the electrode group and damage the electrode group.

[0020] In an optional embodiment, the insert includes an insert body, and a second support portion protruding from the insert body toward a side away from the support plate, and the second support portion is suitable for abutting against an inner side surface of the outer shell structure.

[0021] Beneficial effect: A second support portion is formed by protruding on the side of the insert body away from the support plate. The second support portion is suitable for abutting against the inner side surface of the outer shell structure, thereby forming a gap between the insert body and the inner side surface of the outer shell structure, avoiding local airway blockage caused by excessive fit between the insert and the inner side surface of the outer shell structure, and reducing local extrusion of the outer shell structure during thermal control.

[0022] In an optional embodiment, along the exhaust direction of the explosion-proof valve, the projection of the insert toward the housing structure does not overlap with the explosion-proof valve.

[0023] In an optional embodiment, the support plate includes a support plate body, and the support plate body is provided with a plurality of exhaust holes along an exhaust direction parallel to the explosion-proof valve;

[0024] A protrusion on one side of the support plate body away from the pole group forms at least one first support portion, and the first support portion is suitable for abutting against the inner side surface of the outer shell structure.

[0025] Beneficial effect: By opening a plurality of exhaust holes in the support plate body in parallel with the exhaust direction of the explosion-proof valve, it is convenient to ensure smooth exhaust of gas when thermal runaway occurs, regardless of whether the support plate is deformed or melted.

[0026] In an optional embodiment, the insert body is further formed with a clamping portion, which is suitable for clamping with the exhaust hole to fix the insert on the support plate.

[0027] In a second aspect, the utility model further provides an electrical device, comprising the battery assembly as described above.

[0028] Since the battery cell includes a battery assembly and has the same effect as the battery assembly, it will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is an overall schematic diagram of the battery assembly of the utility model;

[0031] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0032] Figure 3 It is a schematic diagram of the support plate and the insert of the utility model;

[0033] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0034] Figure 5 It is a top view of the support plate and the insert of the utility model;

[0035] Figure 6 for Figure 5 Schematic diagram of CC section;

[0036] Figure 7 It is a side view of the insert of the utility model;

[0037] Figure 8 It is a schematic diagram of the back side of the insert of the utility model.

[0038] Description of reference numerals:

[0039] 100. Shell structure; 1. Shell; 11. Explosion-proof valve; 2. Pole group; 3. Cover plate; 4. Support plate; 41. Exhaust hole; 42. First support part; 43. Support plate body; 5. Insert; 51. Insert body; 52. Second support part; 53. Clamping part. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0041] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0044] Combine the following Figures 1 to 8 , describing an embodiment of the utility model.

[0045] According to an embodiment of the present utility model, on the one hand, a battery assembly is provided, comprising:

[0046] The shell structure 100, at least one side of the shell structure 100 is provided with an explosion-proof valve 11, and the shell structure 100 is enclosed inside to form a hollow cavity;

[0047] The pole group 2 is arranged in the hollow cavity;

[0048] A support plate 4 is supported between the side of the shell structure 100 where the explosion-proof valve 11 is provided and the pole group 2;

[0049] The insert 5 is connected to the support plate 4 and is also located between the side of the outer shell structure 100 where the explosion-proof valve 11 is provided and the pole group 2;

[0050] The melting point of the insert 5 is higher than that of the support plate 4 , and the melting point of the insert 5 is higher than the exhaust temperature of the battery assembly during thermal runaway.

[0051] In this embodiment, the housing structure 100 includes a housing 1 and a cover plate 3. The cover plate 3 is disposed on the opening of the housing 1, and the cover plate 3 can be welded to the housing 1 to enclose the housing structure 100.

[0052] A hollow cavity is formed inside the shell structure 100 , and the pole group 2 is suitable for being placed in the hollow cavity.

[0053] An explosion-proof valve 11 is disposed on at least one side surface of the outer shell structure 100 . Specifically, the explosion-proof valve 11 may be disposed on at least one side surface of the shell 1 , and the explosion-proof valve 11 may also be disposed on the cover plate 3 .

[0054] In this embodiment, there are two explosion-proof valves 11, and both explosion-proof valves 11 are arranged on the narrow side of the housing 1. Correspondingly, the support plate 4 is arranged between the narrow side of the housing 1 and the pole group 2.

[0055] In other alternative implementations, the number of explosion-proof valves 11 can be adjusted according to actual conditions.

[0056] Specifically, the explosion-proof valve 11 is disposed at the upper end of the housing 1. In other alternative embodiments, the explosion-proof valve 11 may also be disposed at the lower end or other side surfaces of the housing 1.

[0057] By providing the support plate 4, a gap is formed between the housing 1 and the electrode group 2, thereby ensuring smooth injection of the electrolyte.

[0058] The battery assembly provided by the embodiment of the utility model supports the support plate 4 between the side of the outer shell structure 100 provided with the explosion-proof valve 11 and the pole group 2, and further arranges the insert 5 so that the insert 5 is also located between the side of the outer shell structure 100 provided with the explosion-proof valve 11 and the pole group 2; the melting point of the insert 5 is higher than the melting point of the support plate 4, and the melting point of the insert 5 is higher than the exhaust temperature of the battery assembly during thermal runaway, so that when thermal runaway occurs inside the battery cell, even if the support plate 4 will deform and melt in a short time, the insert 5 can still be guaranteed to be between the side of the outer shell structure 100 provided with the explosion-proof valve 11 and the pole group 2, thereby ensuring the support effect on the pole group, avoiding the displacement of the pole group under the action of internal air pressure, preventing the explosion-proof valve 11 from being blocked, providing sufficient airway space, ensuring smooth discharge of airflow, and reducing safety hazards.

[0059] Optionally, the material of the support plate 4 can be a plastic material (such as PP, PC, etc.). Although these materials are corrosion-resistant, they do not have high temperature resistance. If the support plate 4 is replaced with a high temperature resistant material as a whole, the cost of the structural parts will increase significantly, making it difficult to achieve mass production. The battery assembly provided by the embodiment of the utility model realizes the combination of two materials by setting an insert 5 on the support plate 4, which not only meets the support and limiting function during daily use, but also ensures smooth exhaust during thermal runaway, while reducing the overall manufacturing cost and achieving two-way satisfaction of performance and cost.

[0060] The support plate 4 is made of plastic material, and can be made of a die-cut piece with a thickness of 0.2 mm to 0.3 mm.

[0061] The material of the insert 5 can be metal, resin or the like.

[0062] When the support plate 4 corresponds to the narrow side of the shell 1, the size of the support plate 4 is longer. This embodiment adopts an integrally formed support plate 4, and forms a complete structural component by integrally injection molding the insert 5 and the support plate 4, thereby avoiding a large number of single parts, avoiding missing parts during assembly, and reducing the difficulty of automated assembly.

[0063] In some embodiments, in combination Figure 2 As shown, the insert 5 is arranged on the side of the support plate 4 facing the outer shell structure 100 .

[0064] By arranging the insert 5 on the side of the support plate 4 facing the outer shell structure 100, it is convenient for the insert 5 to directly abut against the outer shell structure 100. When the support plate 4 melts, it can ensure that the insert 5 is always in contact with the outer shell structure 100, avoiding the insert 5 from slipping and preventing the gas path blockage caused by misalignment.

[0065] In some embodiments, in combination Figure 3 As shown, a plurality of inserts 5 are arranged at intervals along the extension direction of the support plate 4 .

[0066] Along the extension direction of the support plate 4, multiple inserts 5 are arranged at intervals, which can enable multiple points of the pole group 2 to abut against the inserts 5, ensuring that multiple positions of the pole group 2 along the extension direction can be supported, providing sufficient airway space, and ensuring smooth discharge of airflow.

[0067] In some embodiments, along a plane perpendicular to the support plate 4 , the total area of ​​the plurality of inserts 5 is F, and satisfies F ≥ S / 8, wherein F = N*X*Y, wherein N is the number of inserts 5 , S is the area of ​​the side of the shell structure 100 on which the explosion-proof valve 11 is provided, X is the width of a single insert 5 , and Y is the length of a single insert 5 .

[0068] By limiting the total area of ​​multiple inserts 5 to F≥S / 8, it is possible to ensure that the inserts 5 provide sufficient support to the electrode group 2, so that multiple positions of the electrode group 2 along the extension direction can be supported, providing sufficient airway space to ensure smooth discharge of airflow.

[0069] In some embodiments, the width X of the insert 5 is ≥ 1 / 3L, wherein L is the width of the support plate 4 parallel to the width direction of the insert 5 .

[0070] By limiting the width X of the insert 5 to ≥ 1 / 3L, after thermal runaway occurs, even if the support plate 4 melts, the insert 5 can still have sufficient contact space when supporting the electrode group 2, ensuring that the support area of ​​the insert 5 for the electrode group 2 is more balanced and avoiding the electrode group 2 from tilting.

[0071] At the same time, it is prevented that the insert 5 which is too narrow will cause indentation to the pole group 2, thereby preventing the pole group 2 from being damaged.

[0072] In some embodiments, in combination Figure 4 , Figure 6 As shown, the insert 5 includes an insert body 51 and a second support portion 52 protruding from the insert body 51 toward a side away from the support plate 4 , and the second support portion 52 is suitable for abutting against the inner side surface of the outer shell structure 100 .

[0073] A second support portion 52 is formed by protruding on the side of the insert body 51 away from the support plate 4. The second support portion 52 is suitable for abutting against the inner side surface of the outer shell structure 100, so that a gap is formed between the insert body 51 and the inner side surface of the outer shell structure 100, thereby avoiding local airway blockage caused by excessive fit between the insert 5 and the inner side surface of the outer shell structure 100, and reducing local extrusion of the outer shell structure 100 during thermal control.

[0074] In some embodiments, along the exhaust direction of the explosion-proof valve 11 , the projection of the insert 5 toward the housing structure 100 does not overlap with the explosion-proof valve 11 .

[0075] This reduces the interference of the insert 5 with the exhaust of the explosion-proof valve 11 .

[0076] In some embodiments, in combination Figure 4 As shown, the support plate 4 includes a support plate body 43, and the support plate body 43 is provided with a plurality of exhaust holes 41 along the exhaust direction parallel to the explosion-proof valve 11;

[0077] At least one first supporting portion 42 is formed on a protrusion on a side of the supporting plate body 43 away from the pole group 2 . The first supporting portion 42 is suitable for abutting against the inner side surface of the outer shell structure 100 .

[0078] By opening a plurality of exhaust holes 41 in the support plate body 43 along the exhaust direction parallel to the explosion-proof valve 11 , when thermal runaway occurs, the gas can be smoothly discharged regardless of whether the support plate 4 is deformed or melted.

[0079] In addition, at least one first support portion 42 is formed by the protrusion of the support plate body 43 away from the electrode group 2, and the first support portion 42 is suitable for abutting against the inner side of the shell structure 100, which can ensure the smooth injection of the electrolyte. At the same time, when thermal runaway occurs, whether the support plate 4 is deformed or melted, it can ensure the smooth discharge of gas and ensure sufficient exhaust space.

[0080] In some embodiments, in combination Figure 6 , Figure 7 , Figure 8 As shown, the insert body 51 is further formed with a clamping portion 53 , which is suitable for clamping with the exhaust hole 41 to fix the insert 5 on the support plate 4 .

[0081] Optionally, a clamping portion 53 is formed on a protrusion on one side of the insert body 51 away from the second supporting portion 52 .

[0082] By inserting the clamping portion 53 into the exhaust hole 41 , the insert 5 can be fixed on the support plate 4 , so that the insert 5 and the support plate 4 form an integrated structure.

[0083] According to an embodiment of the present utility model, on the other hand, an electric device is provided, including: the battery assembly as described above.

[0084] Obviously, the above embodiments are only examples for clear explanation, and are not intended to limit the implementation methods. Although the embodiments of the present utility model are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations are all within the scope defined by the present utility model.

Claims

1. A battery assembly, characterized in that: include: A shell structure, wherein at least one side of the shell structure is provided with an explosion-proof valve, and the shell structure is enclosed inside to form a hollow cavity; A pole group is arranged in the hollow cavity; A support plate, supported between the side of the shell structure where the explosion-proof valve is provided and the pole group; An insert connected to the support plate, and the insert is also located between the side of the shell structure where the explosion-proof valve is provided and the pole group; The melting point of the insert is higher than the melting point of the support plate, and the melting point of the insert is higher than the exhaust temperature of the battery assembly during thermal runaway.

2. The battery assembly according to claim 1, characterized in that: The insert is arranged on a side of the support plate facing the shell structure.

3. The battery assembly according to claim 1, characterized in that: A plurality of the inserts are arranged at intervals along the extending direction of the support plate.

4. The battery assembly according to claim 3, characterized in that: Along a plane perpendicular to the support plate, the total area of ​​the plurality of inserts is F, and satisfies F≥S / 8, wherein F=N*X*Y, wherein N is the number of the inserts, S is the area of ​​the side of the shell structure on which the explosion-proof valve is provided, X is the width of a single insert, and Y is the length of a single insert.

5. The battery assembly according to claim 4, characterized in that: The width X of the insert is ≥ 1 / 3L, wherein L is the width of the support plate parallel to the width direction of the insert.

6. The battery assembly according to any one of claims 1 to 5, characterized in that: The insert comprises an insert body and a second supporting portion protruding from the insert body toward a side away from the supporting plate, and the second supporting portion is suitable for abutting against an inner side surface of the outer shell structure.

7. The battery assembly according to claim 6, characterized in that: Along the exhaust direction of the explosion-proof valve, the projection of the insert toward the shell structure does not overlap with the explosion-proof valve.

8. The battery assembly according to claim 6, characterized in that: The support plate comprises a support plate body, and the support plate body is provided with a plurality of exhaust holes along an exhaust direction parallel to the explosion-proof valve; Furthermore, at least one first supporting portion is formed on a protrusion on one side of the support plate body away from the pole group, and the first supporting portion is suitable for abutting against the inner side surface of the outer shell structure.

9. The battery assembly according to claim 8, characterized in that: The insert body is further formed with a clamping portion, and the clamping portion is suitable for clamping with the exhaust hole to fix the insert on the support plate.

10. An electrical device, characterized in that: A battery assembly comprising the battery assembly as claimed in any one of claims 1 to 9.

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