Protection assembly, battery and electric device

Abstract

The utility model discloses a protection assembly, a battery and a power utilization device, the protection assembly is arranged between a top cover and a battery cell, and the protection assembly comprises an insulation pad which is provided with a mounting sinking table extending along the height direction of the insulation pad; and the battery cell protection part is arranged in the mounting sinking table. According to the protection assembly, the insulation protection effect can be achieved, the occupation of the battery space is reduced, the utilization rate of the battery space is improved, the assembly process is simplified, and the assembly efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery structures, and more specifically, to a protection component. In addition, the utility model also relates to a battery and an electrical device including the above protection component. Background Art

[0002] Under the background of global energy conservation, emission reduction and sustainable development, power batteries have the characteristics of high energy density, long cycle life, no memory effect and environmental friendliness, and are widely used in plug-in hybrid electric vehicles, hybrid electric vehicles and pure electric vehicles. Energy storage batteries are mainly used for solar power generation equipment, wind power generation equipment and storage batteries for renewable energy storage.

[0003] In related technologies, the battery structure mainly includes a core, a top cover, a lower plastic, a connecting piece, a protection piece, etc. Among them, the lower plastic is arranged in the top cover to achieve the insulation of the top cover, and the protection piece is arranged between the connecting piece and the top cover to achieve the protection of the core. In this structure, the installation of the lower plastic and the protection piece both occupy the height space inside the battery, resulting in a relatively large overall occupancy of the battery internal space.

[0004] In summary, how to provide a structure that can meet the insulation and protection effects while reducing the occupancy of the battery internal space is an urgent problem to be solved by those skilled in the art at present. Summary of the Utility Model

[0005] In view of this, the purpose of the utility model is to provide a protection component, which can meet the insulation and protection effects, reduce the occupancy of the battery space, improve the utilization rate of the battery space, simplify the assembly process and improve the assembly efficiency.

[0006] Another purpose of the utility model is to provide a battery and an electrical device including the above protection component.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A protection component is arranged between the top cover and the battery core, and the protection component includes:

[0009] An insulating pad is provided with an installation sink extending along its height direction;

[0010] A battery core protection part is arranged in the installation sink.

[0011] Preferably, the top surface of the battery core protection part is not higher than the top surface of the insulating pad.

[0012] Preferably, the battery core protection part includes at least two protection sheets, and the protection sheets are fixedly connected or integrally formed with the insulating pad.

[0013] Preferably, the ratio of the area S1 of the protection sheet to the area S2 of the insulation pad is less than 1.

[0014] Preferably, a plurality of the protection sheets are symmetrically arranged with respect to the median line in the length direction of the insulation pad.

[0015] Preferably, the insulation pad is provided with a liquid injection port; the insulation pad is provided with at least one exhaust hole and / or at least one weight reduction port; the weight reduction port includes a weight reduction through hole and / or a weight reduction notch provided in the insulation pad.

[0016] Preferably, the insulation pad includes a middle connecting body and end connecting bodies connected to both sides of the middle connecting body, and at least one of the middle connecting body and the end connecting bodies is provided with a plurality of the weight reduction through holes and / or the weight reduction notches;

[0017] And / or, at least one of the middle connecting body and the end connecting bodies is provided with a reinforcing rib.

[0018] Preferably, the battery cell protection part is a metal protection part;

[0019] And / or, the thickness T1 of the insulation pad is 0.3 - 5 mm, and the thickness T2 of the battery cell protection part is 0.05 - 3 mm.

[0020] The present utility model further provides a battery, including a battery cell assembly, and the battery cell assembly includes:

[0021] A battery cell, connected with a tab;

[0022] A protection assembly, which is the protection assembly described in any one of the above, and the protection assembly is arranged on the upper side of the battery cell;

[0023] A pole connection piece, which is arranged on the upper side of the tab, and the battery cell protection part, the tab, and the pole connection piece are stacked.

[0024] Preferably, the tab and the pole connection piece are adhesively connected to the side facing the battery cell.

[0025] Preferably, the pole connection piece includes:

[0026] A body, which is clamped and positioned with the insulation pad and is arranged on the upper side of the tab, the body is provided with an avoidance hole, and the avoidance hole is correspondingly arranged with the liquid injection port of the protection assembly;

[0027] A pole, protruding from the surface of the body.

[0028] Preferably, the battery cell assembly further includes:

[0029] An insulating spacer, which is connected to the side of the pole connection piece facing away from the battery cell and has a hole position that mates with the pole;

[0030] Mylar is an insulating film with a wrapping space. The insulating spacer, the pole connection piece, the tab, the protection assembly, and the battery cell stacked from top to bottom are arranged in the wrapping space;

[0031] And / or, the thickness of the insulating spacer is greater than 0.1 mm, and the thickness of the Mylar is greater than 0.05 mm.

[0032] Preferably, the ratio of the area S5 of the body to the area S2 of the insulating pad is less than 0.7;

[0033] And / or, the ratio of the area S2 of the insulating pad to the unfolded area S3 of the Mylar is greater than 0.02.

[0034] And / or, the ratio of the width L2 of the tab to the width L1 of the protection piece of the battery cell protection part is less than 1.

[0035] Preferably, it further includes:

[0036] A housing, which has a receiving cavity and an opening. The battery cell assembly is arranged in the receiving cavity;

[0037] A top cover, which is arranged on the top of the battery cell assembly and connects the opening. The battery cell is connected to the top cover through a pole.

[0038] Preferably, the ratio of the area S2 of the insulating pad to the bottom area S4 of the top cover is greater than 0.2;

[0039] And / or, the tab, the protection assembly, and the pole connection piece are welded to form a weld seam. The weld seam is any one of a semicircle, a sharp triangle, a trapezoid, a double wave peak, and a column. The weld width of the weld seam is 0.3 - 5 mm, and the weld depth of the weld seam is 0.3 - 10 mm.

[0040] The present utility model also provides an electrical device, including the battery according to any one of the above.

[0041] The protection assembly provided by the present utility model is arranged between the top cover and the battery cell to achieve an insulation protection effect; the protection assembly specifically includes an insulating pad, and the insulating pad is used to achieve the insulation of the top cover; the battery cell protection part is arranged in the installation sink of the insulating pad. The installation sink extends along the height direction of the insulating pad. The battery cell is protected through the battery cell protection part to prevent the battery cell from being damaged by high temperature; the battery cell protection part is arranged in the installation sink of the insulating pad. The insulating pad and the battery cell protection part can share the same height space in the battery during assembly, so as to reduce the occupation of the battery space and improve the battery space utilization rate.

[0042] Furthermore, the insulating pad and the battery cell protection part can be processed integrally, which is convenient for modular production. During assembly, the assembly process is simplified and the assembly efficiency is improved.

[0043] The present utility model also provides a battery and an electrical device including the above protection component. Since the above protection component is provided, the occupation of the battery space can be reduced and the utilization rate of the battery space can be improved. Description of the Drawings

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative work.

[0045] Figure 1 The first structural schematic diagram of the protection component provided by the present utility model;

[0046] Figure 2 For Figure 1 Another perspective schematic diagram;

[0047] Figure 3 The second structural schematic diagram of the protection component provided by the present utility model;

[0048] Figure 4 The separation state schematic diagram of the insulating pad and the battery cell protection part provided by the present utility model;

[0049] Figure 5 The structural schematic diagram of the insulating pad provided by the present utility model;

[0050] Figure 6 The separation state schematic diagram of the first protection component and the battery cell provided by the present utility model;

[0051] Figure 7 The first step connection schematic diagram of the first protection component and the battery cell provided by the utility model;

[0052] Figure 8 The second step connection schematic diagram of the first protection component and the battery cell provided by the utility model;

[0053] Figure 9 The connection schematic diagram of the pole connection piece, the battery cell, and the first protection component provided by the present utility model;

[0054] Figure 10 For Figure 9 Half-sectional view;

[0055] Figure 11 The second schematic diagram of the separation state of the protection component and the battery cell provided by the present utility model;

[0056] Figure 12 The connection schematic diagram of the pole connection piece, the battery cell, and the second protection component provided by the present utility model;

[0057] Figure 13 is Figure 12 The half-sectional view of;

[0058] Figure 14 The structural schematic diagram of the pole connection piece provided by the present utility model;

[0059] Figure 15 An exploded schematic diagram of the protection component provided by the present utility model;

[0060] Figure 16 The second exploded schematic diagram of the protection component provided by the present utility model;

[0061] Figure 17 The third exploded schematic diagram of the protection component provided by the present utility model;

[0062] Figure 18 The structural schematic diagram of the battery cell provided by the present utility model;

[0063] Figure 19 The explosion diagram of the battery cell provided by the present utility model;

[0064] Figure 20 The structural schematic diagram of the battery provided by the present utility model;

[0065] Figure 21 The cross-sectional view of the battery provided by the present utility model.

[0066] Figures 1 - 21 Among them, the reference numerals include:

[0067] 1 - Top cover; 2 - Battery cell assembly; 3 - Housing; 4 - Weld bead;

[0068] 11 - Explosion-proof valve; 12 - Liquid injection part; 13 - Terminal hole position;

[0069] 21 - Insulating spacer; 22 - Pole connection piece; 23 - Protection component; 24 - Battery cell; 25 - Mylar; 26 - Tab; 27 - Core bonding glue;

[0070] 221 - Body; 222 - Positioning hole; 223 - Pole; 224 - Avoidance hole; 231 - Insulating pad; 232 - Battery cell protection part; 233 - Pole;

[0071] 2311 - Middle connecting body; 2312 - Mounting counterbore; 2313 - Liquid injection port; 2314 - Card column; 2315 - Weight reduction port; 2316 - Reinforcing rib; 2317 - Vent hole; 2318 - Card slot; 2319 - End connecting body;

[0072] 2321 - Protective sheet. Specific embodiments

[0073] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0074] The core of the present invention is to provide a protection component, which can meet the insulation protection effect, reduce the occupation of the battery space, improve the battery space utilization rate, simplify the assembly process, and improve the assembly efficiency. Another core of the present invention is to provide a battery and an electrical device including the above protection component.

[0075] The protection component provided by the present invention is disposed between the top cover 1 and the battery cell 24 for insulation and protection of the top cover 1 and the battery cell 24. Please refer to Figure 19 and Figure 20 . The battery cell 24 can specifically be a wound core or a stacked core. As an implementation manner, when the battery cell 24 is a wound core, it can include one or more wound core bodies. As an implementation manner, when the battery cell 24 is a stacked core, it can include one or more stacked core bodies. If multiple battery cells are provided, multiple battery cells can be connected by the core bonding glue 27.

[0076] Please refer to Figure 1 , Figure 3 and Figure 6 , the protection component specifically includes an insulating pad 231 and a battery cell protection part 232. The insulating pad 231 is used for the insulation of the top cover 1 to prevent the top cover 1 and the battery cell 24 from contacting and short - circuiting.

[0077] The battery cell protection part 232 is used for the protection of the battery cell 24, specifically to prevent high temperature or metal particles generated during component welding from entering the battery cell 24, prevent laser welding penetration, avoid damage to the battery cell 24, and ensure the service life of the battery cell 24.

[0078] The insulating pad 231 is made of insulating material, while the battery cell protection part 232 is a metal protection part made of metal material. The specific selection of the two materials can be flexibly selected according to the actual situation and will not be limited too much here.

[0079] Please refer to Figure 15, the thickness T1 of the insulating pad 231 is 0.3 - 5 mm, and the thickness T2 of the battery cell protection part 232 is 0.05 - 3 mm. On the basis of ensuring processing feasibility and insulation performance, the overall space occupied by the protection component in the battery is further reduced, and the battery capacity is increased.

[0080] The insulating pad 231 is provided with an installation sink 2312 extending along its height direction. The insulating pad 231 is usually a sheet structure, and the height direction of the insulating pad 231 is the thickness direction of the sheet structure. The installation sink 2312 extends along the height direction for placing the battery cell protection part 232. As Figure 15 shown, the height (thickness) direction of the insulating pad 231 is the Z direction, and the length direction of the insulating pad 231 is the X direction.

[0081] The battery cell protection part 232 is arranged in the installation sink 2312. During assembly, the battery cell protection part 232 and the insulating pad 231 can share the same height space in the installed battery, reducing the occupancy of the battery space and improving the battery space utilization rate.

[0082] In addition, the battery cell protection part 232 is arranged on the insulating pad 231, which can be fixedly connected, or the protection component can be processed into an integral part, reducing the assembly process and improving the assembly efficiency during assembly.

[0083] In one embodiment, the connection between the battery cell protection part 232 and the insulating pad 231 can be achieved through hole position matching, step matching, ferrule matching, etc., as long as the insulating pad 231 can provide an installation space for the battery cell protection part 232.

[0084] In this embodiment, the specific position of the battery cell protection part 232 on the insulating pad 231 can be designed according to the actual situation to avoid the influence of laser welding operation on the battery cell 24.

[0085] The above protection component is applied between the top cover 1 and the battery cell 24 during application to achieve an insulation protection effect; the protection component specifically includes an insulating pad 231, and the insulating pad 231 is used to achieve insulation between the top cover 1 and the battery cell 24; the battery cell protection part 232 is arranged in the installation sink 2312 of the insulating pad 231 to achieve protection of the battery cell 24 and prevent damage to the battery cell 24 caused by high temperature; the battery cell protection part 232 is provided with an installation space by the insulating pad 231, and the insulating pad 231 and the battery cell protection part 232 can share the same installation space in the battery during assembly to reduce the occupancy of the battery space and improve the battery space utilization rate; in addition, the insulating pad 231 and the battery cell protection part 232 can be processed into one body, which is convenient for modular production and simplifies the assembly process and improves the assembly efficiency during assembly.

[0086] On the basis of the above embodiment, as a specific implementation, please refer to Figure 6, the top surface of the battery cell protection part 232 is not higher than the top surface of the insulating pad 231, that is, the insulating pad 231 can provide an installation space for the battery cell protection part 232. The thickness of the battery cell protection part 232 is not greater than the thickness of the insulating pad 231, and the battery cell protection part 232 does not protrude from the top surface of the insulating pad 231. It should be noted that the top surface of the insulating pad 231 refers to the highest position or the plane where the highest position is located of the insulating pad 231.

[0087] During assembly, the battery cell protection part 232 and the insulating pad 231 can share the same height space inside the battery to be installed, reducing the occupancy of the battery space and improving the utilization rate of the battery space.

[0088] Based on any of the above embodiments, the battery cell protection part 232 includes at least two protection sheets 2321, and the protection sheets 2321 are fixedly connected or integrally formed with the insulating pad 231.

[0089] Please refer to Figures 4 - 5 , the battery cell protection part 232 includes at least two protection sheets 2321. As an implementation manner, several protection sheets 2321 are arranged in the same installation sink 2312, or there are at least two installation sinks 2312 corresponding to the insulating pad 231. The structures of the installation sink 2312 and the protection sheet 2321 can be adaptively set without too many restrictions.

[0090] Please refer to Figure 4 , when the battery cell protection part 232 includes two protection sheets 2321, it corresponds to one battery cell body;

[0091] Please refer to Figure 5 , when the battery cell protection part 232 includes four protection sheets 2321, it corresponds to two battery cell bodies.

[0092] As an implementation manner, the number of the protection sheets 2321 can be an even number, which can be flexibly selected according to the actual situation and is not limited here.

[0093] As an implementation manner, for the connection between the protection sheet 2321 and the insulating pad 231, in this case, the two can be formed into a module assembly by bonding, so as to facilitate mass production, improve production efficiency, reduce costs, and facilitate improving the assembly efficiency.

[0094] As an implementation manner, the protection sheet 2321 and the insulating pad 231 can also be integrally formed, that is, the two are injection-molded and fitted to form a module assembly, which is convenient for mass production, improves production efficiency, reduces costs, and is convenient for improving the assembly efficiency.

[0095] As an implementation manner, please refer to Figure 15, the ratio of the area S1 of the protection sheet 2321 to the area S2 of the insulating pad 231 is less than 1. To meet the requirements of processing feasibility, preventing welding leakage, and preventing short circuits, the range of S1 / S2 is preferably set to 0.05 - 0.5. The area S1 of the insulating pad 231, as Figure 15 shown, the product of the length and width of the sheet-like structure pointed by the S1 arrow is S1. Here, the length is the dimension in the X direction of the sheet-like structure, and the width is the dimension in the Y direction of the sheet-like structure.

[0096] As an implementation manner, several protection sheets 2321 are symmetrically arranged about the midline in the length direction of the insulating pad 231, and the projections of several protection sheets 2321 arranged in the width direction of the insulating pad 231 on the first plane overlap, completely overlap, or do not overlap. The first plane is the plane corresponding to the thickness direction of the insulating pad 231.

[0097] As an implementation manner, the protection sheet 2321 is usually rectangular or a structure similar to a rectangle. Its longer side can be defined as the length direction, and its shorter side can be defined as the width direction. The protection sheet 2321 has a certain thickness, and the plane corresponding to the thickness direction is defined as the first plane.

[0098] As an implementation manner, several protection sheets 2321 can be arranged in alignment or offset in the width direction of the insulating pad 231; as an implementation manner, several protection sheets 2321 can be arranged in alignment or offset in the length direction of the insulating pad 231;

[0099] As an implementation manner, the projections of multiple protection sheets 2321 in the plane perpendicular to the insulating pad 231 can have at least partial overlap or at least partial non - overlap.

[0100] As an implementation manner, please refer to Figure 1 、 Figure 3 , multiple protection sheets 2321 are symmetrically arranged along the midline in the length direction of the insulating pad 231. Taking four protection sheets 2321 as an example, two protection sheets 2321 are arranged on both the left and right sides of the midline in the length direction of the insulating pad 231.

[0101] As an implementation manner, please refer to Figure 15 , the projections of two protection sheets 2321 arranged in the width direction of the insulating pad 231 on the first plane completely overlap;

[0102] As an implementation manner, please refer to Figure 16 , the projections of two protection sheets 2321 arranged in the width direction of the insulating pad 231 on the first plane have partial overlap;

[0103] As an implementation manner, please refer to Figure 17, the projections of the two protection pieces 2321 arranged along the width direction of the insulating pad 231 on the first plane do not overlap at all.

[0104] The different overlapping relationships of the projections of the two protection pieces 2321 arranged along the width direction of the above three insulating pads 231 on the first plane are to form more position relationships, which are specifically determined by the positions of the tabs 26 on the battery cell 24, and there is no excessive limitation.

[0105] Based on any of the above embodiments, at least two mounting sinks 2312 are provided on the insulating pad 231, and the protection pieces 2321 are all arranged in the corresponding mounting sinks 2312.

[0106] Please refer to Figure 1 , Figures 3 - 5 , at least two mounting sinks 2312 are provided on the insulating pad 231, the protection pieces 2321 are arranged in the mounting sinks 2312, each mounting sink 2312 corresponds to one protection piece 2321, and the mounting sink 2312 is a non-through structure. The form of the mounting sink 2312 provides an installation space for the protection piece 2321 to ensure the stability of the connection between the protection piece 2321 and the insulating pad 231.

[0107] The depth of the mounting sink 2312 is greater than the thickness of the protection piece 2321, that is, the protection piece 2321 completely extends into the insulating pad 231 to ensure a reliable connection between the two.

[0108] In a specific embodiment, when the protection piece 2321 and the insulating pad 231 are injection-molded and integrated, the position of the protection piece 2321 is first positioned in the mounting sink 2312, and then the insulating pad 231 is cast and formed, so that the processing of the protection component can be realized.

[0109] When the protection piece 2321 and the insulating pad 231 are connected to form an integrated part, a space or a matching fixing structure for the end of the protection piece 2321 to extend into can be provided in the insulating pad 231. After positioning, the two are bonded, which can ensure a reliable connection strength.

[0110] As an implementation manner, the mounting sink 2312 is preferably lower than the surface of the insulating pad 231, and the depth is preferably 0.2 - 1 mm, which can be adaptively set according to the thickness of the protection piece 2321.

[0111] As an implementation manner, the insulating pad 231 is provided with a liquid injection port 2313.

[0112] The liquid injection port 2313 includes a notch recessed inward from the side of the insulating pad 231 in the width direction, and / or a through hole provided on the insulating pad 231.

[0113] The liquid injection port 2313 is the electrolyte injection port, and the electrolyte flows to the battery cell 24 through the liquid injection port 2313.

[0114] Please refer to Figure 4 , the liquid injection port 2313 is a notch provided on the insulating pad 231, and the projections of the liquid injection port 2313 and the mounting sink 2312 in the thickness direction of the insulating pad 231 overlap;

[0115] As an implementation manner, please refer to Figure 1 , Figure 3 , Figure 5 , the liquid injection port 2313 is a through hole provided on the insulating pad 231, and the liquid injection port 2313 is provided between two adjacent mounting sinks 2312. It should be noted that in this embodiment, since the liquid injection port 2313 needs to form the conduction of the electrolyte from the liquid injection part 12 of the top cover 1 to the battery cell 24, the liquid injection port 2313 is a through structure in the longitudinal direction.

[0116] In addition, the liquid injection port 2313 can also be a through hole or a notch at other positions or in other forms, or a combined form of the two. During use, it only needs to be cooperatively arranged with the liquid injection part 12 on the top cover 1 to ensure the reliable injection of the electrolyte.

[0117] As an implementation manner, the insulating pad 231 is provided with an exhaust hole 2317 and / or a weight reduction port 2315.

[0118] Among them, at least one exhaust hole 2317 is provided; at least one weight reduction port 2315 is provided and includes a weight reduction through hole and / or a weight reduction notch provided on the insulating pad 231.

[0119] As an implementation manner, please refer to Figure 1 , Figure 18 , the exhaust hole 2317 is provided on the insulating pad 231 and is used to guide the internal air flow of the battery to the explosion-proof valve area on the top cover 1, so as to facilitate the timely opening of the explosion-proof valve 11 in case of abnormality and play a safety protection role.

[0120] As an implementation manner, the specific number of the exhaust holes 2317 is not limited, and the shape can be strip-shaped, circular, arc-shaped or other shapes or combined shapes.

[0121] As an implementation manner, for the convenience of processing, the number of the exhaust holes 2317 is set to 1 to 20.

[0122] On the insulating pad 231, a weight reduction through hole and / or a weight reduction notch can also be provided. On the basis of meeting the overall structural strength, through holes and notches for weight reduction can be opened to achieve lightweight design. The weight reduction through holes and notches can also be used as electrolyte through ports to ensure that the electrolyte fully wets the battery cell 24.

[0123] As an implementation manner, the specific shapes of the weight-reducing through holes and weight-reducing notches are not limited, and can be square, circular, irregular shapes, etc.

[0124] As an implementation manner, the insulating pad 231 includes a middle connecting body 2311 and end connecting bodies 2319 connected to both sides of the middle connecting body 2311. At least one of the middle connecting body 2311 and the end connecting bodies 2319 is provided with a plurality of weight-reducing through holes and / or weight-reducing notches;

[0125] And / or, at least one of the middle connecting body 2311 and the end connecting bodies 2319 is provided with reinforcing ribs 2316.

[0126] Please refer to Figure 1 , the insulating pad 231 specifically includes a middle connecting body 2311 and end connecting bodies 2319 on both sides thereof. The middle connecting body 2311 and the end connecting bodies 2319 are integrally formed. The middle connecting body 2311 corresponds to the middle position of the battery cell 24 and is provided with an exhaust hole 2317.

[0127] As an implementation manner, a clamping groove 2318 can be provided on the end connecting body 2319 to facilitate the installation and storage of the overall protection component. In the process operation, the overall protection component can be transferred by a moving arm clamping the clamping groove 2318 for installation or storage operations, etc. The specific structural form of the clamping groove is not limited and is defined in combination with the actual operation requirements. The clamping groove 2318 is a through structure and the number is greater than or equal to 2. On the premise of ensuring the assembly accuracy and the structural strength, the number of the clamping grooves 2318 is set to 2 to 5.

[0128] In addition, based on the setting of the weight-reducing through holes and / or weight-reducing through holes, in order to ensure the overall strength and reliability of the insulating pad 231, reinforcing ribs 2316 are provided on at least one of the middle connecting body 2311 and the end connecting bodies 2319. The setting position, number and height of the reinforcing ribs 2316 can be set in combination with the actual requirements. It should be noted that, under the condition of meeting the use requirements, the height should be as small as possible to avoid occupying too much internal space of the battery.

[0129] In addition to the above protection component, the present utility model also provides a battery including the protection component disclosed in the above embodiments. The battery includes a battery cell assembly 2, and the battery cell assembly 2 specifically includes: a battery cell 24, a protection component 23 and a pole connection piece 22.

[0130] Specifically, an electrode tab 26 is connected to the battery cell 24;

[0131] The protection component 23 is the protection component 23 provided in any of the above embodiments, and the protection component 23 is arranged on the upper side of the battery cell 24.

[0132] The pole connection piece 22 is arranged on the upper side of the tab 26, and the battery cell protection part 232, the tab 26, and the pole connection piece 22 are stacked.

[0133] Please refer to Figure 6 、 Figure 11 , there are at least two groups of tabs 26, corresponding to the positive and negative electrodes of the battery cell 24. That is to say, the positive electrode of the battery cell 24 can be connected to one group, two groups or three groups of tabs 26, and the negative electrode of the battery cell 24 can be connected to one group, two groups or three groups of tabs 26, which are used to lead out the current of the battery cell 24. The tab 26 is electrically connected to the pole connection piece 22, and the current is further led out to the outside through the pole connection piece 22.

[0134] Please refer to Figure 6 、 Figure 7 , the battery cell protection part 232 of the protection component 23 is arranged between the B surface of the tab 26 and the C surface of the battery cell 24. The battery cell protection part 232, the tab 26, and the pole connection piece 22 are connected in sequence. The connection here can be welding. Before assembly, the battery cell 24, the pole connection piece 22, the protection component 23, and the tab 26 are welded into a component for modular production, reducing the structural part assembly process and materials, improving production efficiency, and reducing production costs. In this case, the battery cell protection part 232 and the insulating pad 231 are preferably a modular component formed by injection molding and fitting to achieve modular production and improve assembly and production efficiency.

[0135] As Figures 6 - 9 shown, taking the example that the insulating pad 231 is provided with a weight reduction notch, the weight reduction notch is correspondingly arranged with the protection piece 2321. The corresponding arrangement here means that the two correspond one by one. When the tab 26 contacts the protection piece 2321, it will first contact the top surface of the battery cell 24 below the weight reduction notch, increasing the contact area between the tab 26 and the battery cell 24 and improving the current conduction effect.

[0136] In addition, as Figure 9 and Figure 12 shown, two tabs 26 with different polarities are separated by the insulating pad 231 to prevent short circuit caused by their contact.

[0137] In addition, as Figure 15 shown, the ratio between the width L2 of the tab 26 and the width L1 of the protection piece 2321 is less than 1, and the ratio is preferably 0.5 - 0.95 to ensure the reliability of assembly and welding and the effective protection of the protection piece 2321 for the battery cell 24.

[0138] Please refer to Figures 6 - 8 , the first part of the tab 26 ( Figure 6 the part where the tab 26 is connected to the battery cell 24 and fits on the C surface of the battery cell 24 in Figure 6The bent portion of the middle tab 26 is bent relative to the first portion and welded to the protective sheet 2321; the tab connecting piece 22 is disposed on the D surface of the second portion of the tab 26, and the process of welding the tab 26, the tab connecting piece 22, the battery cell 24, and the protective component 23 into a component is realized by welding the tab connecting piece 22 and the tab 26.

[0139] As an implementation manner, the B surface of the second portion of the tab 26 is attached and connected to the top surface of the battery cell protection portion 232 (the surface of the battery cell protection portion 232 away from the battery cell 24), and the D surface of the second portion of the tab 26 is attached and connected to the surface of the tab connecting piece 22 facing the battery cell 24 to form the connection of the tab 26, the tab connecting piece 22, the battery cell 24, and the protective component 23.

[0140] As an implementation manner, after the B surface of the second portion of the tab 26 is connected to the battery cell protection portion 232, the D surface of the second portion of the tab 26 is not higher than the top surface of the insulating pad 231 (the surface of the insulating pad 231 away from the battery cell 24), so that the tab 26 and the protective component 23 can share a section of height installation space in the battery, and the tab 26 itself no longer occupies additional height space inside the battery, further improving the utilization rate of the battery space. As an implementation manner, the D surface of the second portion of the tab 26 can be lower than or flush with the top surface of the insulating pad 231, that is, the sum of the thicknesses of the battery cell protection portion 232 and the tab 26 is less than or equal to the thickness of the insulating pad 231, and specific flexible design can be carried out in combination with the actual situation without too many restrictions.

[0141] As an implementation manner, the tab connecting piece 22 includes:

[0142] A body 221, which is clamped and positioned with the insulating pad 231 and is disposed above the tab 26; the body 221 is provided with an avoidance hole 224, and the avoidance hole 224 is correspondingly arranged with the liquid injection port 2313 of the protective component 23;

[0143] A tab 223, which protrudes from the surface of the body 221.

[0144] Please refer to Figure 14 , the tab connecting piece 22 is set to two split structures, each split structure corresponds to the connection of a tab of a polarity, and the two split structures have a certain distance in the length direction to avoid short circuit, and each split structure includes a body 221, an avoidance hole 224, and a tab 223.

[0145] Please refer to Figure 1 , Figure 14, the main body 221 is snap-fitted and positioned with the insulating pad 231 and is disposed on the upper side of the tab 26. The snap-fitting and positioning here is specifically that a snap post 2314 is provided on either the main body 221 or the insulating pad 231, and a positioning hole 222 is provided on the other. The cooperation of the snap post 2314 and the positioning hole 222 provides positioning during connection, achieving the effects of preliminary fixing and anti-rotation.

[0146] In this embodiment, the specific shapes of the snap post 2314 and the positioning hole 222 are not limited. For example, the snap post 2314 can be a cylinder, a square post, a multi-sided post, etc., and the corresponding positioning hole 222 can be set accordingly.

[0147] As an implementation manner, a plurality of snap posts 2314 are provided on the insulating pad 231, and a plurality of corresponding positioning holes 222 are provided on the pole connection piece 22. The plurality of snap posts 2314 can specifically form a triangular structure to ensure the stable and reliable connection between the protection component 23 and the pole connection piece 22.

[0148] As an implementation manner, the height of the snap post 2314 is preferably 0.5 - 5 mm, and the number is preferably 1 - 10 to ensure the strength of the protection component 23. On the basis that the snap post 2314 protrudes from the insulating pad 231, if the insulating pad 231 is also provided with a reinforcing rib 2316, the height of the corresponding reinforcing rib 2316 is preferably the same as that of the snap post 2314 to avoid the overall protection component 23 occupying too much space inside the battery.

[0149] In addition, a relief hole 224 is also provided on the main body 221. The relief hole 224 is specifically provided corresponding to the liquid injection port 2313 of the protection component 23. When injecting electrolyte into the battery cell, the relief hole 224 does not affect the flow of the electrolyte to the battery cell 24, ensuring the wetting effect of the battery cell 24. Under the condition of meeting the welding requirements of the pole connection piece 22 and the tab 26, the relief hole 224 can be set slightly larger to ensure the flow effect of the electrolyte.

[0150] The pole 223 protrudes from the surface of the main body 221 and is electrically connected to the battery cell 24 and the top cover 1. The two poles 223 correspond to the positive and negative electrodes of the battery. The poles 223 are directly provided on the pole connection piece 22. During assembly, the poles 223 can pass through the corresponding terminal holes 13 on the top cover 1.

[0151] As an implementation manner, the battery further includes an insulating spacer 21 and Mylar 25 (Mylar film). The insulating spacer 21 is connected to the side of the pole connection piece 22 facing away from the battery cell 24 and has holes matching the poles 223; Mylar 25 has a wrapping space, and the insulating spacer 21, the pole connection piece 22, the tab 26, the protection component 23, and the battery cell 24 connected in sequence from top to bottom are disposed in the wrapping space.

[0152] Please refer toFigures 18 - 19 , the insulating spacer 21 is arranged corresponding to the pole post connecting piece 22 to achieve the first insulation protection of the pole post connecting piece 22, and the Mylar 25 wraps the insulating spacer 21, the pole post connecting piece 22, the pole tab 26, the protection component 23, and the battery cell 24 from top to bottom to form the second insulation protection of the pole post connecting piece 22.

[0153] In this embodiment, both the insulating spacer 21 and the Mylar 25 are made of insulating materials. The thickness of the insulating spacer 21 is greater than 0.1 mm, and the thickness of the Mylar 25 is greater than 0.05 mm.

[0154] The thickness of the Mylar 25 is preferably 0.05 - 0.3 mm, and the thickness of the insulating spacer 21 is preferably 0.1 - 1 mm.

[0155] It should be noted that the thickness of the Mylar 25 specifically refers to the film thickness of the Mylar film.

[0156] In this embodiment, the insulating spacer 21 at least covers the pole post connecting piece 22, and has a hole for the pole post 223 to pass through, as well as a space for the electrolyte to flow, ensuring that the insulating spacer 21 can achieve effective and reliable insulation. In addition, the insulating spacer 21 at least covering the pole post connecting piece 22 can also prevent damage to the Mylar 25 caused by particles generated after the welding of the pole post connecting piece 22, ensuring the service life of the Mylar 25.

[0157] The insulating spacer 21 has a hole for the pole post 223 to pass through. Correspondingly, the Mylar 25 is also provided with a hole for the pole post 223 to pass through. The pole post 223 passes through the insulating spacer 21 and the Mylar 25 and extends out of the top cover 1.

[0158] The Mylar 25 wraps the insulating spacer 21, the pole post connecting piece 22, the pole tab 26, the protection component 23, and the battery cell 24 from top to bottom and overlaps at the bottom to form a battery cell assembly 2.

[0159] In this embodiment, please refer to Figure 14 , Figure 15 , the ratio of the area S5 of the main body 221 to the area S2 of the insulating pad 231 is less than 0.7. To ensure the overcurrent performance, the ratio of S5 / S2 is preferably 0.2 - 0.6.

[0160] Please refer to Figure 15 , Figure 19 , the ratio of the area S2 of the insulating pad 231 to the unfolded area S3 of the Mylar 25 is greater than 0.02. For the convenience of assembly, the ratio of S2 / S3 is set to 0.05 - 0.5.

[0161] Please refer to Figure 15, the ratio of the width L2 of the tab 26 to the width L1 of the protective sheet 2321 of the cell protection part 232 is less than 1, ensuring a reliable and effective protection effect.

[0162] Please refer to Figures 8 - 13 , Figure 10 and Figure 13 both have a weld bead 4 indicating the welding position. The arrow structure at the upper position in the figure is a schematic of the welding torch.

[0163] When welding the cell 24, the tab 26, the protection component 23, and the pole connection piece 22, the shape of the weld formed can be semi-circular, sharp triangular, trapezoidal, double-wave peak, or columnar. The fusion width of the weld is 0.3 - 5 mm, and the fusion depth of the weld is 0.3 - 10 mm.

[0164] In this embodiment, to effectively ensure the reliability and tightness of the weld, the weld structure is preferably semi-circular, sharp triangular, or columnar. The weld width is preferably 0.5 - 5.0 mm, and the weld depth is preferably 0.3 - 3.0 mm.

[0165] In addition to the main structure of the battery provided in each of the above embodiments, the battery further includes:

[0166] A housing 3 having an accommodation cavity and an opening, and the cell assembly 2 is disposed in the accommodation cavity;

[0167] A top cover 1 disposed on the top of the cell assembly 2 and connected to the opening. The cell 24 is connected to the top cover 1 through the pole 223.

[0168] Please refer to Figures 20 - 21 , the battery includes a top cover 1, a cell assembly 2, and a housing 3. The housing 3 has an accommodation cavity and an opening. The accommodation cavity is used to place the cell assembly 2. The top cover 1 is welded and sealed to the opening of the housing 3. The terminal hole position 13 on the top cover 1 is assembled and welded with the pole 223 on the cell assembly 2. The cell 24 is connected to the top cover 1 through the pole 223, realizing the electrical connection between the cell 24 of the cell assembly 2 and the top cover 1, ensuring the tightness and structural strength of the battery, and ensuring the service life of the battery. As Figure 21 shown, the weld bead 4 is the working position when the cell assembly 2 and the top cover 1 are welded.

[0169] In this embodiment, the housing 3 is made of a metal material to ensure the strength of the battery. The specific metal can be an alloy or a pure metal without limitation, subject to meeting the usage requirements.

[0170] The top cover 1 is provided with a terminal hole position 13 corresponding to the hole positions on the Mylar 25 and the insulating spacer 21. The pole 223 passes through the insulating spacer 21, the Mylar 25, and the terminal hole position 13 and protrudes from the top surface of the top cover 1.

[0171] The top cover 1 is provided with a liquid injection part 12, corresponding to the liquid injection port 2313 on the protection component 23 and the avoidance hole 224 on the pole connection piece 22, to ensure the flow of the electrolyte.

[0172] In addition, an explosion-proof valve 11 is also provided on the top cover 1, corresponding to the exhaust hole 2317 on the insulating gasket 231, which facilitates the explosion-proof valve 11 to be opened in time under abnormal conditions, ensuring the safety and reliability of battery use.

[0173] In this embodiment, the battery can be a square battery, a blade battery, or a cylindrical battery, without specific limitation.

[0174] On the basis of the above embodiment, the ratio of the area S2 of the insulating gasket 231 to the bottom area S4 of the top cover 1 is greater than 0.2.

[0175] Please refer to Figure 15 、 Figure 20 , the ratio between the area S2 of the insulating gasket 231 and the bottom area S4 of the top cover 1 is greater than 0.2. Preferably, the ratio of S2 / S4 is 0.25 - 0.85, ensuring the effective insulation protection of the insulating gasket 231 for the top cover 1 and the structural integrity of the battery.

[0176] In addition to the above battery, the present utility model also provides an electrical device including the battery described in any of the above embodiments, and the electrical device can be any electronic device.

[0177] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0178] The above provides a detailed introduction to a protection component, a battery, and an electrical device provided by the present utility model. Specific examples are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and modifications can be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. A protective component is disposed between the top cover (1) and the battery cell (24), and is characterized in that, The protection component comprises: The insulating pad (231) is provided with a mounting sink (2312) extending along its height direction; A battery cell protection portion (232), wherein the battery cell protection portion (232) is disposed in the installation sink (2312).

2. The protection component according to claim 1, wherein The top surface of the battery cell protection portion (232) is not higher than the top surface of the insulating pad (231).

3. The protection component according to claim 1, wherein, The battery cell protection portion (232) comprises at least two protection sheets (2321), and the protection sheets (2321) are fixedly connected to or integrally formed with the insulating pad (231).

4. The protection component according to claim 3, characterized in that, The ratio of the area S1 of the protection sheet (2321) to the area S2 of the insulation pad (231) is less than 1.

5. The protection component according to claim 3, wherein The plurality of protection sheets (2321) are symmetrically arranged about a midline in the length direction of the insulating pad (231).

6. The protection component according to claim 5, characterized in that, The insulating pad (231) is provided with a liquid injection port (2313); The insulating pad (231) is provided with at least one exhaust hole (2317) and / or at least one weight-reducing opening (2315); The weight-reducing opening (2315) comprises a weight-reducing through hole and / or a weight-reducing notch provided on the insulating pad (231).

7. The protection component according to claim 6, wherein The insulating pad (231) comprises a middle connector (2311) and end connectors (2319) connected to both sides of the middle connector (2311), and at least one of the middle connector (2311) and the end connector (2319) is provided with a plurality of weight-reducing through holes and / or weight-reducing notches; And / or, at least one of the middle connector (2311) and the end connector (2319) is provided with a reinforcing rib (2316).

8. The protection component according to claim 1, characterized in that, The battery core protection part (232) is a metal protection part; And / or, the thickness T1 of the insulating pad (231) is 0.3 to 5 mm, and the thickness T2 of the battery cell protection portion (232) is 0.05 to 3 mm.

9. A battery, characterized in that, The invention comprises a battery cell assembly (2), wherein the battery cell assembly (2) comprises: The battery cell (24) is connected with a tab (26); A protection component (23), which is the protection component (23) according to any one of claims 1 to 8, and the protection component (23) is arranged on the upper side of the battery cell (24); A pole connecting piece (22), wherein the pole connecting piece (22) is arranged on the upper side of the pole ear (26), and the battery cell protection portion (232), the pole ear (26), and the pole connecting piece (22) are stacked.

10. The battery according to claim 9, characterized in that, The pole ear (26) is fitted and connected to a surface of the pole connecting piece (22) that faces the battery core (24).

11. The battery according to claim 10, characterized in that, The pole connecting piece (22) comprises: A body (221) is snap-fitted and positioned with the insulating pad (231) and is disposed on the upper side of the pole lug (26); the body (221) is provided with a position avoidance hole (224), and the position avoidance hole (224) is disposed correspondingly to the liquid injection port (2313) of the protection component (23); The pole (223) protrudes from the surface of the body (221).

12. The battery according to claim 11, characterized in that, The battery cell assembly (2) further comprises: An insulating spacer (21) connected to a side of the pole connecting piece (22) facing away from the battery core (24) and having a hole for matching with the pole (223); Mylar (25) is an insulating film with a wrapping space, and the insulating spacer (21), the pole connection piece (22), the tab (26), the protection component (23), and the battery cell (24) that are stacked and connected from top to bottom are arranged in the wrapping space; And / or, the thickness of the insulating spacer (21) is greater than 0.1 mm, and the thickness of the Mylar (25) is greater than 0.05 mm.

13. The battery according to claim 12, wherein, The ratio of the area S5 of the body (221) to the area S2 of the insulating pad (231) is less than 0.7; And / or, the ratio of the area S2 of the insulating pad (231) to the unfolded area S3 of the Mylar (25) is greater than 0.02; And / or, the ratio of the width L2 of the tab (26) to the width L1 of the protection piece (2321) of the battery cell protection part (232) is less than 1.

14. The battery according to claim 13, wherein, Further comprising: A housing (3) having a receiving cavity and an opening, and the battery cell assembly (2) is arranged in the receiving cavity; A top cover (1) is arranged on the top of the battery cell assembly (2) and connects to the opening, and the battery cell (24) is connected to the top cover (1) through a pole (223).

15. The battery according to claim 14, characterized in that, The ratio of the area S2 of the insulating pad (231) to the bottom area S4 of the top cover (1) is greater than 0.2; and / or, the tab (26), the protection component (23), and the pole connection piece (22) are welded to form a weld seam, and the weld seam is any one of a semicircle, a sharp triangle, a trapezoid, a double wave peak, and a column. The weld width of the weld seam is 0.3 - 5 mm, and the weld depth of the weld seam is 0.3 - 10 mm.

16. An electrical device, characterized in that, Including the battery according to any one of claims 9 - 15.

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