Battery structure and electric equipment

Abstract

The utility model relates to the technical field of batteries, and provides a battery structure and electric equipment, the battery structure comprises a shell, a built-in pole group structure, and a tab structure arranged on the top side of the pole group structure; the bottom surface of the connecting sheet is connected with the tab structure, and a gas passing channel which is convexly arranged opposite to the tab structure is formed on the connecting sheet; the cover plate assembly is arranged on the top side of the pole group structure and connected with the shell, at least two pole structures are arranged on the cover plate assembly at intervals in a penetrating mode, the pole structures correspond to the connecting pieces, and the pole structures abut against or are connected with the top faces of the connecting pieces; and the explosion-proof structure is arranged on the cover plate assembly or the shell in a penetrating manner and is communicated with the air passing channel. By means of the arrangement, switching over and overflowing of the tabs of the pole group and the cover plate are achieved, meanwhile, the connecting pieces can serve as supporting structures, deformation of the tab structures is reduced or prevented, gas flow guiding is achieved through the gas passing channels, gas exhausting of the explosion-proof structure is smooth, and the deformation acting force of gas on the tab structures is reduced.

Description

Technical Field

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

[0002] At present, in the field of battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields due to their advantages such as long cycle life, high energy density, green environmental protection and long service life.

[0003] Due to the safety requirements for the use of lithium-ion batteries, in the common square lithium battery structure, the cover and the shell are welded and sealed to encapsulate the battery electrode group inside, and the electrode group and the cover electrode column are connected through the connecting piece. The lower plastic in the cover presses against the electrode group to limit the electrode group.

[0004] However, when the battery thermal runaway occurs, the internal temperature rises and the gas production reaches the trigger condition, the battery explosion-proof valve opens, and the internal gas is quickly discharged. At this time, the battery electrode group may be affected by the impact of the airflow. At the same time, due to the high temperature of the battery runaway, the lower plastic material may melt and lose its limiting effect on the electrode group. There is a risk that the electrode group will be lifted by the airflow, blocking the explosion-proof valve and accelerating battery runaway. Utility Model Content

[0005] In view of this, the present invention provides a battery structure and electrical equipment to solve the problem in the prior art that when the battery thermally runs away, the battery explosion-proof valve may be blocked by the electrode group, thereby accelerating the battery runaway.

[0006] In the first aspect, the utility model provides a battery structure, including: a shell, with a built-in pole group structure, and a pole ear structure is arranged on the top side of the pole group structure; a connecting plate, the bottom surface of which is connected to the pole ear structure and is formed with a gas passage protruding away from the pole ear structure; a cover plate assembly, which is arranged on the top side of the pole group structure and is interconnected with the shell, and at least two pole column structures are passed through it at intervals, the pole column structure is arranged corresponding to the connecting plate, and the pole column structure and the top surface of the connecting plate are abutted or connected to each other; an explosion-proof structure is passed through the cover plate assembly or the shell and is connected to the gas passage.

[0007] Beneficial effects:

[0008] By setting a connecting piece connected to the pole ear structure and forming an air passage, such a setting, on the one hand, the connecting piece can be electrically connected to each other by being connected or abutted with the pole column structure and the pole ear structure respectively, thereby realizing the transfer flow between the pole ear and the cover plate of the pole group; on the other hand, combined with the setting of the air passage, when the pole ear structure is subjected to force from factors such as airflow, the connecting piece can serve as a supporting structure, exerting force on the pole ear structure, reducing or preventing deformation of the pole ear structure; at the same time, the setting of the air passage can realize gas diversion, further making the exhaust of the explosion-proof structure smoother when working, reducing the deformation force of the gas on the pole ear structure, and effectively overcoming the defect in the prior art that when the battery thermal runaway occurs, the battery explosion-proof valve may be blocked by the pole group, accelerating the battery runaway.

[0009] In an optional embodiment, the connecting plate includes: a supporting top plate, the top surface of which is connected to the bottom surface of the pole structure; two supporting bottom plates, which are connected in a stepped manner on two opposite edges of the supporting top plate, and the bottom surfaces of which are connected to the pole ear structure, and the air passage is sandwiched between the supporting bottom plates.

[0010] Beneficial effects:

[0011] This arrangement makes the connecting piece take the shape of a triangle or a convex letter, and the area distribution of the support top plate and the support bottom plate can be adjusted as needed to ensure a stable connection with the pole structure and the pole ear structure. In addition, by setting up two support bottom plates, it not only meets the structural support needs of the pole ear structure, but also can be combined with the pole ear structure to form a stable gas passage, and the structure is simple and easy to implement.

[0012] In an optional embodiment, the explosion-proof structure is provided on the cover assembly, and the air passage is provided in the same direction as the length direction of the cover assembly.

[0013] Beneficial effects:

[0014] By inserting the explosion-proof structure through the cover assembly, the cover assembly provides a relatively stable installation foundation in terms of material and structural strength. Furthermore, a gap is created between the cover assembly and the electrode assembly structure, facilitating exhaust and providing a foundation for the gas passage. Furthermore, because the gas passage is oriented in the same direction as the length of the cover assembly, this arrangement ensures smooth airflow guidance when thermal runaway occurs at the top of the electrode assembly, avoiding airflow obstruction and ensuring stable airflow within the gap between the cover assembly and the electrode assembly, along the length of the cover assembly toward the explosion-proof structure.

[0015] In an optional embodiment, the support bottom plate is welded to the pole lug structure, and / or the pole structure is laser welded to the support top plate.

[0016] In an optional embodiment, the cover plate assembly further includes: an insulating spacer, which is connected to the lower side of the cover plate assembly and surrounds the circumference of both the connecting plate and the tab structure, and is suitable for limiting the connecting plate and the tab structure.

[0017] Beneficial effects:

[0018] The provision of the insulating separator can limit the position of the electrode group and form a double protection with the connecting piece to avoid deformation of the electrode ear structure.

[0019] In an optional embodiment, the insulating separator is made of plastic material.

[0020] Beneficial effects:

[0021] This arrangement facilitates improvement based on the structure in the prior art, and the improvement cost is low.

[0022] In an optional embodiment, the battery structure further includes: a top cover patch, which is insulated and has a passage for the explosion-proof structure and the pole structure to pass through, and the top cover patch is correspondingly connected to the top side of the cover assembly.

[0023] In an optional embodiment, the cover plate assembly is provided with two of the pole structures, and the explosion-proof structure is provided between the two pole structures.

[0024] Beneficial effects:

[0025] Setting up the explosion-proof structure in this way, on the one hand, avoids the pole structure from being set up; on the other hand, under the premise of ensuring safety, compliance and low cost, a single explosion-proof structure is set up between the pole structures to avoid the problem that part of the pole group structure on one side is too far away from the explosion-proof structure, resulting in untimely exhaust and battery out of control.

[0026] In an optional embodiment, the battery structure further includes: a protective structure, which is insulated and covers at least two side surfaces of the shell, and the side surfaces are suitable for facing the external structure.

[0027] In a second aspect, the utility model provides an electrical device including the above-mentioned battery structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] 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 any creative work.

[0029] Figure 1 This is a schematic exploded view of the battery structure provided in an embodiment of the present utility model;

[0030] Figure 2 for Figure 1 A schematic top view of the battery structure shown;

[0031] Figure 3 for Figure 2 AA-direction cross-sectional schematic diagram of the battery structure shown;

[0032] Figure 4 for Figure 3 An enlarged schematic diagram of part C of the battery structure shown;

[0033] Figure 5 for Figure 2 A schematic BB-sectional view of the battery structure shown;

[0034] Figure 6 for Figure 5 An enlarged schematic diagram of part D of the battery structure shown;

[0035] Description of reference numerals:

[0036] 1. Shell; 101. Protective structure; 102. Side surface; 2. Pole group structure; 201. Ear structure; 202. Through groove; 203. Socket plate; 3. Connecting piece; 301. Support top plate; 302. Support bottom plate; 303. Air passage; 4. Cover assembly; 401. Pole structure; 5. Explosion-proof structure; 6. Top cover patch. DETAILED DESCRIPTION

[0037] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0038] like Figures 1-6 This embodiment provides a battery structure, preferably a lithium-ion battery, including: a shell 1, a connecting piece 3, a cover assembly 4 and an explosion-proof structure 5.

[0039] Among them, the shell 1 is set in the shape of a square box with an open top, preferably made of aluminum, and has a built-in pole group structure 2. The pole group structure 2 includes a battery cell shell that can be filled with electrolyte, and positive and negative pole ear structures 201 extending out of the battery cell shell. In this embodiment, the top of the shell 1 is open, and the positive and negative pole ear structures 201 extend out from the top side of the corresponding opening of the pole group structure 2.

[0040] The connecting piece 3 is made of a hard conductive material, which can be a metal or composite conductive ceramic material. Specifically, the bottom surface of the connecting piece 3 is connected to the pole ear structure 201 and is formed with an air passage 303. The specific form of the connecting piece 3 is not limited, as long as it can connect and support the pole ear structure 201, form the air passage 303 between the pole ear structure 201 and the pole column structure 401, and provide a reaction force when the pole ear structure 201 is deformed. In this embodiment, the connecting piece 3 is set in a bent shape and is formed with the pole ear structure 201 to form the air passage 303. As a convertible embodiment, the connecting piece 3 can be formed with the air passage 303 by itself.

[0041] The cover assembly 4 is in the shape of a long plate and is arranged on the top side of the pole group structure 2. The sealing buckle is arranged on the opening of the shell 1. Two pole mounting holes are arranged at intervals thereon, and two pole structures 401 are correspondingly penetrated. The pole structure 401 is arranged corresponding to the connecting piece 3. The pole mounting holes are correspondingly projected on the connecting piece 3 and the pole ear structure 201. Preferably, a sealing ring and other structures are also provided in the pole mounting hole. As a convertible embodiment, when multiple groups of pole group structures 2 are separated and arranged in the shell 1, multiple pole structures 401 can be correspondingly provided. In this embodiment, the pole structure 401 extends into the bottom surface of the pole mounting hole and is connected to the top surface of the connecting piece 3. As a convertible embodiment, it can also be abutted. In addition, a liquid injection hole is also provided on the cover assembly 4.

[0042] The explosion-proof structure 5 is provided on the cover assembly 4 or the housing 1 and is connected to the gas passage 303. Specifically, the explosion-proof structure 5 is an explosion-proof valve. In addition, a protective film or other structure may be added.

[0043] By setting a connecting piece 3 connected to the pole ear structure 201 and forming an air passage 303, such a setting, on the one hand, the connecting piece 3 can be electrically connected to each other by being connected or abutted with the pole column structure 401 and the pole ear structure 201 respectively, thereby realizing the transfer flow between the pole ear and the cover plate of the pole group; on the other hand, combined with the setting of the air passage 303, when the pole ear structure 201 is subjected to force from factors such as airflow, the connecting piece 3 can serve as a supporting structure, exerting force on the pole ear structure 201, reducing or preventing the deformation of the pole ear structure 201; at the same time, the setting of the air passage 303 can realize gas diversion, further making the exhaust of the explosion-proof structure 5 smoother when working, reducing the deformation force of the gas on the pole ear structure 201, and effectively overcoming the defect in the prior art that when the battery thermal runaway occurs, the battery explosion-proof valve may be blocked by the pole group, accelerating the battery runaway.

[0044] Preferably, the connecting piece 3 is provided in a bent structure, comprising: a supporting top plate 301 and two supporting bottom plates 302 .

[0045] The connecting piece 3 is specifically arranged in a "ji" shape. A supporting top plate 301 is provided at the top of the "ji" shape, and its top surface is connected to the bottom surface of the pole column structure 401. On both sides of the "ji" shape, two supporting bottom plates 302 in a bent shape are respectively arranged. The two supporting bottom plates 302 and the two opposite edges of the supporting top plate 301 are connected into a stepped structure. The bottom surface of the supporting bottom plate 302 is connected to the ear structure 201, and an air passage 303 is formed by sandwiching the vertical plate surfaces of the two supporting bottom plates 302, the supporting top plate 301, and the ear structure 201 together. As a changeable implementation manner, the supporting bottom plate 302 can also be arranged in a "wu" shape or a closed "tu" shape. Further, a plurality of undulating grooves can be provided on the bottom surface of the supporting bottom plate 302 to increase the structural strength of the supporting bottom plate 302. Further preferably, the supporting bottom plate 302 can be connected to two opposite edge positions of the ear structure 201 along the width direction of the cover assembly 4. As a changeable implementation manner, the projection of the supporting bottom plate 302 covers and connects the entire top surface of the ear structure 201.

[0046] The connecting piece 3 is arranged in a "ji" or "tu" shape, and the area ratio distribution of the supporting top plate 301 and the supporting bottom plate 302 can be adjusted according to needs to ensure stable connection with the pole column structure 401 and the ear structure 201. In addition, by providing two supporting bottom plates 302, it not only meets the structural support requirements for the ear structure 201 but also can form a stable air passage 303 in combination with the ear structure 201, and the structure is simple and easy to implement.

[0047] In this embodiment, the explosion-proof structure 5 penetrates through the cover assembly 4, and the air passage 303 is arranged in the same direction as the length direction of the cover assembly 4.

[0048] By arranging the explosion-proof structure 5 to penetrate through the cover assembly 4, on the one hand, starting from aspects such as materials and structural strength, the cover assembly 4 has a relatively stable installation foundation. On the other hand, there is a gap between the cover assembly 4 and the pole group structure 2, which is convenient for exhaust and provides a setting foundation for the air passage​​​​​Specifically, the support base plate 302 is welded to the tab structure 201, and the pole structure 401 is welded to the support top plate 301, preferably by laser welding. As an alternative embodiment, the connection between the support base plate 302 and the tab structure 201, and between the pole structure 401 and the support top plate 301, or one of the two connection structures, can also be made by high-temperature resistant adhesive bonding, for example.

[0051] More preferably, the top of the tab structure 201 is convex, with a through slot 202 defined on the top surface. The through slot 202 extends in the same direction as the cover assembly 4. Specifically, the through slot 202 is V-shaped. Attachment plates 203 are provided at both ends of the through slot 202 along the width of the cover assembly 4, and are bent toward each other. The top surface of the attachment plate 203 is correspondingly connected to the bottom surface of the support base 302.

[0052] The cover assembly 4 also includes an insulating separator, which is connected to the lower side of the cover assembly 4. Preferably, the insulating separator is arranged in an annular shape and surrounds both the connecting piece 3 and the tab structure 201, suitable for limiting the connection piece 3 and the tab structure 201. The provision of the insulating separator can limit the position of the electrode group, forming a dual protection with the connecting piece 3 to prevent deformation of the tab structure 201.

[0053] In this embodiment, the insulating separator is specifically made of plastic. This configuration facilitates cost-effective improvements based on existing structures. As an alternative embodiment, the insulating separator can also be made of high-temperature resistant insulating ceramic or polymer composite materials.

[0054] The battery structure also includes a top cover patch 6. This is an insulated patch with openings for the explosion-proof structure 5 and the terminal structure 401 to pass through. The top cover patch 6 is connected to the top side of the cover assembly 4. The top cover patch 6 serves as the insulating protective structure 101 of the top cover assembly, making it easy to install and low-cost.

[0055] The cover plate assembly 4 is provided with two pole structures 401, and the explosion-proof structure 5 is provided between the two pole structures 401. Further preferably, the explosion-proof structure 5 is provided in the middle of the length of the cover plate assembly 4. This arrangement of the explosion-proof structure 5, on the one hand, allows it to be spaced away from the pole structures 401. On the other hand, while ensuring safety, compliance, and low cost, providing a single explosion-proof structure 5 between the pole structures 401 can avoid the problem of partial pole group structure 2 on one side being too far away from the explosion-proof structure 5, which could lead to untimely exhaust and battery runaway.

[0056] The battery structure also includes a protective structure 101, preferably a blue film, but also an insulating coating or adhesive tape. Protective structure 101 is insulated and covers at least two side surfaces 102 on the outside of the housing 1. Side surfaces 102 are adapted to face external structures or adjacent battery structures. Preferably, protective structure 101 completely covers the outside of the housing 1. This arrangement prevents the housing 1, which is made of a conductive material, from contacting external structures and potentially causing a short circuit.

[0057] This embodiment further provides an electrical device, which may specifically be a household appliance, a communication tool, or a transportation tool, such as a mobile phone, a tablet computer, a tram, etc., including the above-mentioned battery structure.

[0058] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A battery structure, characterized in that: include: The housing has a built-in pole group structure, and a pole ear structure is arranged on the top side of the pole group structure; A connecting sheet, the bottom surface of which is connected to the tab structure and is formed with a gas passage protruding away from the tab structure; A cover plate assembly is arranged on the top side of the pole group structure and is connected to the shell. At least two pole column structures are arranged on the cover plate at intervals. The pole column structures are arranged corresponding to the connecting piece. The pole column structures and the top surfaces of the connecting piece are abutted or connected to each other. The explosion-proof structure is penetrated on the cover plate assembly or the shell and is connected with the air passage.

2. The battery structure according to claim 1, characterized in that: The connecting piece comprises: A supporting top plate, the top surface of which is connected to the bottom surface of the pole structure; Two support bottom plates are connected and arranged in a step-like manner on two opposite edges of the support top plate, and their bottom surfaces are connected and arranged with the pole ear structure. The air passage is sandwiched between the support bottom plates.

3. The battery structure according to claim 2, characterized in that: The explosion-proof structure is arranged on the cover assembly, and the air passage is arranged in the same direction as the length direction of the cover assembly.

4. The battery structure according to claim 2 or 3, characterized in that: The support bottom plate is welded to the pole lug structure, and / or the pole column structure is laser welded to the support top plate.

5. The battery structure according to any one of claims 1 to 3, characterized in that: The cover plate assembly also includes: The insulating spacer is connected to the lower side of the cover plate assembly and surrounds the circumference of the connecting piece and the pole ear structure, and is suitable for limiting the connecting piece and the pole ear structure.

6. The battery structure according to claim 5, characterized in that: The insulating separator is made of plastic material.

7. The battery structure according to any one of claims 1 to 3 and 6, characterized in that: Also includes: The top cover patch is insulated and is provided with a passage for the explosion-proof structure and the pole structure to pass through. The top cover patch is correspondingly connected and arranged on the top side of the cover plate assembly.

8. The battery structure according to any one of claims 1 to 3 and 6, characterized in that: The cover plate assembly is provided with two pole structures, and the explosion-proof structure is provided between the two pole structures.

9. The battery structure according to any one of claims 1 to 3 and 6, characterized in that: Also includes: The protective structure is insulated and at least covers two side surfaces of the shell, and the side surfaces are suitable for facing the external structure.

10. An electrical device, characterized in that: include: The battery structure according to any one of claims 1 to 9.

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