Bottom supporting plate and battery

Abstract

The utility model provides a bottom supporting plate and a battery, and relates to the technical field of batteries. The utility model provides a bottom supporting plate which comprises a supporting plate body and at least one air guide opening. An air guide groove is formed in the side, facing the anti-explosion valve, of the supporting plate body, and the anti-explosion valve is arranged opposite to the air guide groove. The at least one air guide opening is formed in the side wall of the supporting plate body and communicated with the air guide groove. Compared with a traditional flat sheet type bottom supporting plate, the air guide type bottom supporting plate with the design has the advantages that the original insulating property is achieved; the gas guide groove and the gas guide port can reduce the friction and extrusion of the bottom supporting plate to the explosion-proof valve, so that the potential safety hazards of failure of safety protection of the battery, even explosion and the like caused by the damage of the pressure relief function of the explosion-proof valve due to the friction and extrusion of the bottom supporting plate to the explosion-proof valve are avoided; the gas guide groove and the gas guide port can also form a fixed exhaust channel to guide the gas in the battery to the explosion-proof valve area, so that the gas in the battery is directionally guided to the explosion-proof valve area, and the pressure can be quickly released when the internal pressure of the battery reaches a threshold value.

Description

Base plate and battery Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a base plate and a battery. Background Technology

[0002] Currently, the base plate design for lithium-ion battery cells generally adopts a flat sheet structure. It is heat-fused to the insulating sheet of the bare battery cell to wrap and secure the wound core, with the bottom surface of the base plate in contact with the bottom surface of the casing. As an important component of lithium-ion battery cells, the base plate is mainly used for insulation and protection between the wound core and the casing, ensuring the internal safety of the battery cell.

[0003] Because some lithium-ion battery cells on the market have explosion-proof valves designed on the bottom surface of their casings, if a flat bottom plate is used between the bottom surface of the casing and the core, it will not only cause friction and compression to the explosion-proof valve, affecting its pressure relief function, but in severe cases, it may even damage the explosion-proof valve, causing the battery cell's safety protection to fail. Moreover, if the contact area between the bottom plate and the core is too large or the pressing is too tight, it will hinder the conduction of internal gas, causing the explosion-proof valve to fail to open and release gas in time, making the battery cell susceptible to explosion and other safety hazards, greatly reducing the safety performance of the battery cell. Summary of the Invention

[0004] The purpose of this invention is to provide a base plate and a battery that can directionally guide the gas inside the battery to the explosion-proof valve area.

[0005] The embodiments of this utility model can be implemented as follows:

[0006] In a first aspect, this utility model provides a base plate, comprising:

[0007] The tray body is disposed inside the battery. The tray body has a venting groove on the side facing the explosion-proof valve. The explosion-proof valve is disposed opposite to the venting groove.

[0008] At least one air vent is provided on the side wall of the tray body, the at least one air vent is in communication with the inside of the battery, and the air vent groove is in communication with the inside of the battery through the at least one air vent.

[0009] In an optional embodiment, the pallet body includes a base body and at least two side baffles, the at least two side baffles being disposed on the base body and located on the side of the base body facing the explosion-proof valve;

[0010] At least one air guide groove and at least one air guide port are provided at intervals on the at least two side walls.

[0011] In an optional embodiment, the side walls comprise two;

[0012] The two side walls extend along the extension direction of the base body and are spaced apart. The two side walls are respectively disposed on two opposite sides of the base body, and the outer side wall of the side wall is flush with the outer side wall of the base body.

[0013] The two side baffles spaced apart form the air guide groove and the two air guide ports, which are respectively the first air guide port and the second air guide port. The first air guide port and the second air guide port are respectively disposed at both ends of the air guide groove along the extension direction of the base body.

[0014] In an optional embodiment, the depth of the air guide groove is 55%-85% of the thickness of the pallet body.

[0015] In an optional embodiment, the pallet body has multiple heat-melting zones on one end face facing the explosion-proof valve;

[0016] The hot-melting area is used to hot-melt and fix the insulating sheet of the tray body to the battery.

[0017] Secondly, this utility model provides a battery, including: a battery body;

[0018] The base plate described in any of the foregoing embodiments is disposed inside the battery body, and the at least one air vent communicates with the interior of the battery body.

[0019] In an optional embodiment, the battery body further includes a housing, the bottom of which is provided with an installation port, the explosion-proof valve is disposed at the installation port, the bottom support plate is disposed at the bottom inside the battery body, and the air guide groove is connected to the explosion-proof valve.

[0020] In an optional embodiment, openings are provided at both the left and right ends of the housing, and a top cover assembly is provided at both openings;

[0021] Alternatively, the top of the housing may have an opening, and the opening may have a top cover assembly.

[0022] In an optional embodiment, the battery body further includes a winding core disposed inside the housing, the winding core being located on the side of the base plate away from the explosion-proof valve.

[0023] In an optional embodiment, the battery body further includes an insulating sheet disposed between the inner wall of the housing and the bottom support plate.

[0024] The beneficial effects of the base plate and battery provided in this embodiment of the utility model include:

[0025] Compared to traditional flat base plates, this type of vented base plate design, in addition to retaining the original insulation properties, features vent channels and vents that reduce friction and pressure on the explosion-proof valve. This prevents damage to the valve's pressure relief function caused by friction and pressure, thus avoiding safety hazards such as battery safety protection failure or even explosion. The vent channels and vents also form a fixed exhaust channel to guide the gas inside the battery to the explosion-proof valve area, thereby directionally guiding the gas inside the battery to the explosion-proof valve area so that it can be quickly depressurized when the battery's internal pressure reaches the threshold. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 is a schematic diagram of the battery provided in this embodiment;

[0028] Figure 2 is a cross-sectional view of the battery provided in this embodiment;

[0029] Figure 3 is a schematic diagram of the structure of the shell provided in this embodiment;

[0030] Figure 4 is a structural schematic diagram of the base plate provided in this embodiment;

[0031] Figure 5 is a partial schematic diagram of A in Figure 4;

[0032] Figure 6 is a bottom schematic diagram of the base plate provided in this embodiment;

[0033] Figure 7 is a partial cross-sectional view of the base plate provided in this embodiment.

[0034] Icons: 010-Battery; 100-Battery body; 110-Explosion-proof valve; 111-Pattern; 120-Housing; 121-Mounting port; 122-Opening; 130-Top cover assembly; 140-Core; 150-Insulating sheet; 200-Bottom support plate; 210-Plate body; 211-Base body; 212-Side baffle; 220-Gas channel; 230-Gas inlet; 231-First gas inlet; 232-Second gas inlet; 240-Hot melt area. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0038] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, 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, and therefore should not be construed as a limitation of this utility model.

[0039] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0040] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0041] The following describes in detail the overall structure, working principle, and technical effects of the base plate 200 and battery 010 provided by this utility model through embodiments and in conjunction with the accompanying drawings.

[0042] Please refer to Figures 1-2. The base plate 200 and battery 010 provided by this utility model are applied to the lithium-ion battery 010.

[0043] Please refer to Figures 1-2. This utility model provides a battery 010, which includes a battery body 100 and a bottom support plate 200. The bottom support plate 200 is disposed inside the battery body 100, and at least one air vent 230 is connected to the interior of the battery body 100.

[0044] It is understandable that when the internal pressure of battery 010 reaches the threshold, the explosion-proof valve 110 opens to release pressure, and the gas inside battery 010 enters the gas guide groove 220 from the gas guide port 230, and is discharged from the explosion-proof valve 110 under the guidance of the gas guide groove 220.

[0045] In this embodiment, the battery 010 includes a battery body 100.

[0046] The bottom support plate 200 is disposed inside the battery body 100, and at least one air vent 230 is connected to the interior of the battery body 100.

[0047] In this embodiment, referring to Figures 1-3, the battery body 100 includes a housing 120, a winding core 140, a top cover assembly 130, and a bottom support plate 200 and an insulating sheet 150 disposed within the battery body 100. Referring to Figure 3, the bottom of the housing 120 has a mounting port 121, at which an explosion-proof valve 110 is disposed. The bottom support plate 200 is disposed at the bottom of the battery body 100, and a vent groove 220 communicates with the explosion-proof valve 110. A patch 111 is also attached to the surface of the explosion-proof valve 110.

[0048] It is understandable that the explosion-proof valve 110 is positioned directly opposite the air guide groove 220 to prevent the side wall 212 of the base plate 200 from blocking the explosion-proof valve 110 or causing friction and compression by the side wall 212 of the base plate 200 on the explosion-proof valve 110.

[0049] Referring to Figure 2, the core 140 is disposed inside the housing 120, and the core 140 is located on the side of the bottom support plate 200 away from the explosion-proof valve 110; the insulating sheet 150 is disposed between the inner wall of the housing 120 and the bottom support plate 200. The bottom support plate 200 and the insulating sheet 150 are located between the battery 010 and the core 140 to ensure insulation and protective safety between the battery 010 and the core 140.

[0050] Optionally, referring to Figure 3, the housing 120 is a box structure with openings 122 at both ends. Openings 122 are provided at both the left and right ends of the housing 120, and the top cover assembly 130 is sealed by the two openings 122.

[0051] Optionally, the housing 120 is a box-shaped structure with a top opening 122. The top of the housing 120 is provided with an opening 122, and the opening 122 seals the top cover assembly 130.

[0052] In this embodiment, the battery 010 includes a base plate 200.

[0053] Please refer to Figures 4-7. The bottom support plate 200 proposed in this utility model includes:

[0054] The tray body 210 is disposed inside the battery 010. The tray body 210 has a venting groove 220 on the side facing the explosion-proof valve 110. The explosion-proof valve 110 is disposed opposite to the venting groove 220.

[0055] At least one air vent 230 is provided on the side wall of the tray body 210, and at least one air vent 230 communicates with the inside of the battery 010. The air vent groove 220 communicates with the inside of the battery 010 through at least one air vent 230.

[0056] It is understood that the ventilated base plate 200 proposed in this application forms a gap channel between the ventilated groove 220 and the explosion-proof valve 110 by setting the ventilated groove 220 and the ventilated port 230 in the base plate 200, as shown in Figure 7; when the internal pressure of the battery 010 reaches the threshold, the explosion-proof valve 110 opens to release pressure, and the gas inside the battery 010 enters the ventilated groove 220 from the ventilated port 230 and is discharged from the explosion-proof valve 110 under the guidance of the ventilated groove 220. Compared to the traditional flat base plate 200, the base plate 200 designed in this application, in addition to having the original insulation properties, has the following advantages: the air guide groove 220 and air guide port 230 can reduce the friction and compression of the base plate 200 on the explosion-proof valve 110, avoiding damage to its pressure relief function due to friction and compression of the base plate 200 on the explosion-proof valve 110, thus preventing safety hazards such as failure of battery 010 safety protection or even explosion; the air guide groove 220 and air guide port 230 can also form a fixed exhaust channel to guide the gas inside the battery 010 to the explosion-proof valve 110 area, thereby directionally guiding the gas inside the battery 010 to the explosion-proof valve 110 area so that it can quickly release pressure when the internal pressure of the battery 010 reaches the threshold.

[0057] The top of the base plate 200 faces the winding core 140, and the bottom of the base plate 200 faces the explosion-proof valve 110 and is connected to the inner bottom wall of the housing 120. This arrangement of the base plate 200 provides insulation between the winding core 140 and the housing 120, thereby ensuring insulation and safety between the winding core 140 and the housing 120 inside the battery 010. Therefore, the vent 230, located on the side wall of the base plate body 210, can better guide the gas inside the battery 010.

[0058] Optionally, the air inlet 230 can be located on any side wall of the rectangular base plate 200, as long as it is connected to the air guide groove 220.

[0059] In this embodiment, the pallet body 210 includes a base body 211 and at least two side baffles 212. The at least two side baffles 212 are disposed on the base body 211 and located on the side of the base body 211 facing the explosion-proof valve 110. At least one air guide groove 220 and at least one air guide port 230 are provided on the at least two side baffles 212 at intervals.

[0060] In an optional embodiment, if the pallet body 210 is a rectangular block structure, a recessed air guide groove 220 is carved out at the bottom of the pallet body 210 relative to the explosion-proof valve 110, and the air guide groove 220 covers the area of ​​the explosion-proof valve 110; and an air guide port 230 communicating with the air guide groove 220 is provided on the side wall of the side baffle 212.

[0061] In this embodiment, please refer to Figures 5-6. The side baffles 212 include two side baffles 212. The two side baffles 212 extend along the extension direction of the base body 211 and are spaced apart. The two side baffles 212 are respectively disposed on two opposite sides of the base body 211 and the outer side wall of the side baffles 212 is flush with the outer side wall of the base body 211.

[0062] Furthermore, two spaced-apart side baffles 212 form a venting groove 220 that runs through the support plate body 210 and two venting ports 230. The two venting ports 230 are a first venting port 231 and a second venting port 232, which are respectively located at both ends of the venting groove 220 along the extension direction of the base body 211. An explosion-proof valve 110 is positioned relative to the venting groove 220 so that the venting groove 220 covers the area of ​​the explosion-proof valve 110. The first venting port 231 and the second venting port 232 are located at both ends of the venting groove 220 and are connected to the venting groove 220.

[0063] Understandably, the two side baffles 212 can guide the gas inside the battery 010 that enters from the first air inlet 231 and the second air inlet 232 to the explosion-proof valve 110 area.

[0064] Optionally, the two side baffles 212 can extend laterally along the extension direction of the base body 211, and the two side baffles 212 can also extend longitudinally along the extension direction of the base body 211. Both methods can form an air guide groove 220 that runs through the pallet body 210.

[0065] Of course, in other alternative embodiments, the side baffles 212 may be three, four, or other quantities, with multiple side baffles 212 spaced apart on the base body 211 and located on the side of the base body 211 facing the explosion-proof valve 110; and multiple side baffles 212 spaced apart to form irregularly shaped air guide grooves 220 and multiple air guide ports 230.

[0066] Optionally, the cross-sectional shape of the side baffle 212 and the air guide groove 220 can be a rounded rectangle, a chamfered rectangle, a trapezoid, etc. on the same side, and the specific shape is not limited.

[0067] Optionally, the depth of the air guide groove 220 is 55%-85% of the thickness of the pallet body 210. Specifically, the depth of the air guide groove 220 is 55%, 56%, 57%, 58%, 59%, 60%, ..., 70%, ..., 83%, 84%, or 85% of the thickness of the pallet body 210.

[0068] In this embodiment, please refer to FIG6. The pallet body 210 has a plurality of hot melt areas 240 on one end face facing the explosion-proof valve 110. The hot melt areas 240 are used to hot melt and fix the insulating sheet 150 of the pallet body 210 and the battery 010.

[0069] The hot-melting zone 240 can be set on the bottom surface of the side baffle 212.

[0070] It is understandable that the tray body 210 is fixed to the bottom of the insulating sheet 150 by hot melt adhesive provided in the hot melt area 240.

[0071] The working principle and process of the base plate 200 and battery 010 provided in this embodiment of the utility model are as follows: When the internal pressure of the battery 010 reaches the threshold, the explosion-proof valve 110 opens to release pressure, and the gas inside the battery 010 enters the air guide groove 220 from the air guide port 230 and is discharged from the explosion-proof valve 110 under the guidance of the air guide groove 220.

[0072] In summary, the base plate 200 and battery 010 provided in this embodiment of the present invention, with this ventilated base plate 200 compared to the traditional flat base plate 200, in addition to having the original insulation properties, the ventilated groove 220 and ventilated port 230 can reduce the friction and compression of the explosion-proof valve 110 by the base plate 200, avoiding damage to the pressure relief function of the explosion-proof valve 110 due to the friction and compression of the base plate 200 on the explosion-proof valve 110, thus preventing safety hazards such as failure of battery 010 safety protection or even explosion; the ventilated groove 220 and ventilated port 230 can also form a fixed exhaust channel to guide the gas inside the battery 010 to the explosion-proof valve 110 area, thereby directionally guiding the gas inside the battery 010 to the explosion-proof valve 110 area, so that the internal pressure of the battery 010 can be quickly depressurized when it reaches the threshold.

[0073] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A base plate, characterized in that, include: The tray body is disposed inside the battery. The tray body has a venting groove on the side facing the explosion-proof valve. The explosion-proof valve is disposed opposite to the venting groove. At least one air vent is provided on the side wall of the tray body, the at least one air vent is in communication with the inside of the battery, and the air vent groove is in communication with the inside of the battery through the at least one air vent.

2. The base plate according to claim 1, characterized in that, The pallet body includes a base body and at least two side walls, the at least two side walls being disposed on the base body and located on the side of the base body facing the explosion-proof valve; at least one air guide groove and at least one air guide port are formed on the at least two side walls at intervals.

3. The base plate according to claim 2, characterized in that, The side baffles include two side baffles; the two side baffles extend along the extension direction of the base body and are spaced apart, the two side baffles are respectively disposed on two opposite sides of the base body and the outer side wall of the side baffles is flush with the outer side wall of the base body; the two spaced side baffles form the air guide groove and the two air guide ports, the two air guide ports are respectively the first air guide port and the second air guide port, the first air guide port and the second air guide port are respectively disposed at both ends of the air guide groove along the extension direction of the base body.

4. The base plate according to claim 1, characterized in that, The depth of the air guide groove is 55%-85% of the thickness of the pallet body.

5. The base plate according to claim 1, characterized in that, The tray body has multiple heat-fusion zones on one end face facing the explosion-proof valve; the heat-fusion zones are used to heat-fuse and fix the tray body and the insulating sheet of the battery.

6. A battery, characterized in that, include: Battery body; the base plate according to any one of claims 1-5, wherein the base plate is disposed inside the battery body.

7. The battery according to claim 6, characterized in that, The battery body also includes a housing, the bottom of which is provided with an installation port, the explosion-proof valve is located at the installation port, the bottom support plate is located at the bottom of the battery body, and the air guide groove is connected to the explosion-proof valve.

8. The battery according to claim 7, characterized in that, The housing has openings at both the left and right ends, and a top cover assembly is provided at each of the two openings; or, the housing has an opening at the top, and a top cover assembly is provided at each opening.

9. The battery according to claim 7, characterized in that, The battery body also includes a winding core, which is disposed inside the housing and located on the side of the bottom plate away from the explosion-proof valve.

10. The battery according to claim 9, characterized in that, The battery body also includes an insulating sheet, which is disposed between the inner wall of the housing and the bottom support plate.

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