CN218160709U - Power battery and electric equipment thereof - Google Patents

Abstract

The utility model belongs to the technical field of batteries, in particular to a power battery and electric equipment, wherein the power battery comprises a shell and an electrode component, and the bottom of the shell is provided with an explosion-proof sheet; the electrode assembly is arranged in the shell, the electrode assembly is provided with a containing groove corresponding to the explosion-proof sheet, and the forward projection area of the containing groove is larger than or equal to that of the explosion-proof sheet. The utility model provides a pair of power battery, it sets up the explosion-proof piece in the casing bottom to corresponding position at electrode subassembly is provided with the recess, when the inside atmospheric pressure of battery reaches upper limit atmospheric pressure, can spray car seat dorsad from explosion-proof piece valve port department spun liquid, solid combustion thing and conducting material, moreover, can also avoid the welding slag and the sharp-pointed foreign matter of explosion-proof piece welding department to puncture the risk of rolling up the core.

Description

Power battery and electric equipment thereof

Technical Field

The utility model belongs to the technical field of the battery, concretely relates to power battery and consumer thereof.

Background

In recent years, the market share of new energy automobiles is increased year by year, people also put higher requirements on various performances of the new energy automobiles, wherein the safety performance is a key factor for stable development of power batteries.

The mainstream design of present power battery is that the explosion-proof piece is in the centre of battery top cap two utmost point posts, and this structural design has sufficient space in the middle of mainly considering the top cap, and can increase the welding slag damage book core that the plastic structure prevented explosion-proof piece welding production. However, the power battery is mainly installed at the bottom of the whole vehicle at present, when the battery swells, deforms and other special conditions occur, the explosion-proof sheet can be triggered, liquid, solid comburent and conductive substances in the battery can be directly sprayed upwards, and the life safety of passengers is greatly influenced.

At present, in order to improve the safety performance of a power battery, an explosion-proof sheet is designed at the bottom of a battery shell, although the design can reduce the risk caused by opening a valve, the structure has the risk that welding slag and sharp foreign matters at the welding position of the explosion-proof sheet puncture a winding core.

SUMMERY OF THE UTILITY MODEL

One of the purposes of the utility model lies in: the power battery is provided aiming at the defects of the prior art, and the problem that the roll core is easy to puncture when the explosion-proof sheet is arranged at the bottom of the battery is solved.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the power battery comprises a shell and an electrode assembly, wherein an explosion-proof sheet is arranged at the bottom of the shell; the electrode assembly is arranged in the shell, the electrode assembly is provided with a containing groove corresponding to the explosion-proof sheet, and the forward projection area of the containing groove is larger than or equal to that of the explosion-proof sheet.

Further, the electrode assembly is of a wound type structure or a laminated type structure.

Further, the accommodating groove is square, circular or elliptical.

Furthermore, a convex part is formed at the bottom of the shell along the thickness direction of the shell in an inward protruding mode, and the convex part is contained in the inner cavity of the containing groove.

Further, the explosion-proof piece comprises a main body part and a concave part formed by inwards sinking the main body part along the thickness direction of the main body part, and the concave part and the main body part are coaxially arranged.

Further, still include the protection sheet, the protection sheet is the slice, just the protection sheet sets up on the explosion-proof piece dorsad an end face of electrode subassembly.

Further, the height of the convex portion is h1, the depth of the accommodating groove is h2, wherein h1 and h2 satisfy the relation: h1 is more than or equal to 0.1mm and less than or equal to h2 is more than or equal to 5mm.

Further, the length of the convex portion is L1, the length of the accommodating groove is L2, wherein L1 and L2 satisfy the following relation: l1 is more than or equal to 1mm and less than or equal to L2 is more than or equal to 80mm.

Further, the width of the convex part is D1, the width of the accommodating groove is D2, wherein D1 is larger than or equal to 1mm and D2 is larger than or equal to 80mm.

Further, the shell is of a square structure or a cylindrical structure.

Further, the shell is an aluminum shell or a steel shell.

The utility model discloses a second of purpose lies in: an electric device is provided, which comprises the power battery.

The beneficial effects of the utility model reside in that: the power battery comprises a shell and an electrode assembly, wherein an explosion-proof sheet is arranged at the bottom of the shell; the electrode assembly is arranged in the shell, the electrode assembly is provided with a containing groove corresponding to the explosion-proof sheet, and the forward projection area of the containing groove is larger than or equal to that of the explosion-proof sheet. The utility model provides a pair of power battery, it sets up the explosion-proof piece in the casing bottom to corresponding position at electrode subassembly is provided with the recess, when the inside atmospheric pressure of battery reaches upper limit atmospheric pressure, can spray car seat dorsad from explosion-proof piece valve port department spun liquid, solid combustion thing and conducting material, moreover, can also avoid the welding slag and the sharp-pointed foreign matter of explosion-proof piece welding department to puncture the risk of rolling up the core.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

Fig. 1 is a schematic structural view of a vehicle according to embodiment 1 of the present invention;

fig. 2 is one of the schematic structural diagrams of the battery in embodiment 1 of the present invention;

fig. 3 is a second schematic structural diagram of a battery according to embodiment 1 of the present invention;

FIG. 4 is an enlarged view of part A of FIG. 3;

fig. 5 is a third schematic structural diagram of a battery according to embodiment 1 of the present invention;

FIG. 6 is an enlarged view of part B of FIG. 5;

fig. 7 is a schematic bottom structure view of a battery according to embodiment 1 of the present invention;

fig. 8 is a schematic structural view of an electrode assembly in embodiment 1 of the present invention;

fig. 9 is a schematic structural view of a battery according to embodiment 2 of the present invention;

fig. 10 is a partially enlarged view of C of fig. 9.

Wherein the reference numerals are as follows:

1. a housing; 11. a convex portion; 2. an explosion-proof sheet; 21. a main body portion; 22. a recess; 3. an electrode assembly; 3a, an axis of the electrode assembly; 31. a containing groove; 4. a protective sheet; h1, height of the convex part; h2, the depth of the avoiding part; l1, length of the convex part; l2, length of the avoiding part; d1, the width of the convex part; d2, the width of the avoiding part;

100. a vehicle; 101. a battery.

Detailed Description

As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.

In the description of the application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In the description of the present application, unless explicitly stated or limited otherwise, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more; the terms "connected," "secured," and the like are to be construed broadly and unless otherwise stated or indicated, and for example, "connected" may be a fixed connection, a removable connection, an integral connection, or an electrical connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The present invention will be described in further detail with reference to fig. 1 to 10, but the present invention is not limited thereto.

Example 1

Referring to fig. 2 to 4, embodiment 1 provides a power battery, which includes a case 1 and an electrode assembly 3, wherein an explosion-proof sheet 2 is disposed at the bottom of the case 1; the electrode assembly 3 is arranged in the shell 1, the electrode assembly 3 is provided with a containing groove 31 corresponding to the explosion-proof sheet 2, and the forward projection area of the containing groove 31 is larger than or equal to the forward projection area of the explosion-proof sheet 2. The utility model provides a pair of power battery, it sets up explosion-proof piece 2 in 1 bottom of casing to corresponding position at electrode subassembly 3 is provided with the recess, when the inside atmospheric pressure of battery reaches upper limit atmospheric pressure, can spray from 2 valve ports of explosion-proof piece spun liquid, solid combustion thing and conducting material car seat dorsad, moreover, can also avoid the risk that the welding slag and the sharp-pointed foreign matter of 2 welding departments of explosion-proof piece pricked.

More specifically, the electrode assembly 3 includes a first pole piece, a second pole piece, and a separator separating the first pole piece and the second pole piece, the polarities of the first pole piece and the second pole piece are opposite, in embodiment 1, the first pole piece, the separator, and the second pole piece are wound to form the electrode assembly 3, and alternatively, the first pole piece, the separator, and the second pole piece are stacked to form the electrode assembly 3.

In embodiment 1, a cavity for accommodating a battery is formed inside the case 1, an open opening is formed at the top of the case 1, and the electrode assembly 3 can be placed into the cavity through the open opening, and in embodiment 1, in order to seal the open opening, a cover plate is correspondingly disposed, the cover plate covers the open opening and is hermetically connected with the case 1, and an electrolyte is further accommodated in the cavity.

In embodiment 1, referring to fig. 3 to 4, the receiving groove 31 is a groove structure formed by recessing one surface of the electrode assembly 3 in a direction close to the opening, and the shape of the groove structure includes any one of a square shape, a circular shape, and an oval shape. Due to the structural design, when the explosion-proof sheet 2 is welded at the bottom of the shell 1, welding slag and sharp foreign matters generated by welding are contained in the containing cavity formed by the groove structure, so that the risk that the electrode assembly 3 is punctured by the welding slag and the sharp foreign matters is avoided.

In embodiment 1, referring to fig. 4, the explosion-proof sheet 2 includes a main body portion 21 and a concave portion 22 formed by the main body portion 21 being depressed inward in the thickness direction thereof, the concave portion 22 and the main body portion 21 being coaxially disposed, and explosion-proof scores being etched in the concave portion 22. In this embodiment 1, in order to improve the reliability and the sealing performance of the installation of the explosion-proof plate 2, the structure that the bottom of the housing 1 protrudes into the inner cavity of the housing to form the protruding portion 11 is preferentially adopted, a stepped hole is provided in the protruding portion 11, and the explosion-proof plate 2 is embedded in the stepped hole. Adopt this kind of structural design, can prevent that explosion-proof piece 2 from being pushed into the risk in the casing 1 inner chamber under the effect of external force striking.

In the present embodiment 1, the power battery further includes a protective sheet, the protective sheet 4 is in the shape of a sheet, and the protective sheet 4 is disposed on an end face of the explosion-proof sheet 2 facing away from the electrode assembly 3. By adopting the structural design, the phenomenon that the explosion-proof sheet 2 is damaged under the external force impact can be prevented, so that the explosion-proof sheet 2 can be normally used, and the risk of liquid leakage of the battery is prevented.

More specifically, referring to fig. 3 to 4, embodiment 1 provides a case 1 in which a bottom portion of the case 1 is formed with a protrusion 11 protruding inward in a thickness direction thereof, and the protrusion 11 is accommodated in an inner cavity of the accommodation groove 31. Wherein, the shoulder hole has been seted up in convex part 11, when producing a large amount of gases in the battery inside, when making the inside atmospheric pressure of battery reach upper limit atmospheric pressure, gas pressure is used in explosion-proof piece 1, make the sculpture have the position of explosion-proof nick to take place to break in advance because intensity is lower and be formed with the pressure release mouth, thereby make inside gas and some materials discharge from this pressure release mouth, correspondingly, because other positions of explosion-proof piece 2 have sufficient intensity, when the inside atmospheric pressure of battery reaches upper limit atmospheric pressure, can not take place to tear, when can guaranteeing that the pressure release passageway is enough big, also can guarantee battery case 1's intensity, avoid the battery to explode, make battery case 1 have good security performance in the use. More specifically, the height of the protrusion 11 is h1, and the depth of the accommodating groove 31 is h2, where h1 and h2 satisfy the following relation: h1 is more than or equal to 0.1mm and less than or equal to h2 is more than or equal to 5mm; the length of the protruding portion 11 is L1, and the length of the receiving groove 31 is L2, where L1 and L2 satisfy the relation: l1 is more than or equal to 1mm and L2 is more than or equal to 80mm; the width of the convex part 11 is D1, the width of the accommodating groove 31 is D2, wherein D1 is more than or equal to 1mm and D2 is more than or equal to 80mm. This kind of structural design for storage tank 31 covers convex part 11 completely, and makes and leaves the vacant space between convex part 11 and the electrode subassembly 3, not only can form exhaust passage, avoids explosion-proof piece 2's pressure release mouth to be plugged up by electrode subassembly 3, and simultaneously, adopts this kind of structural design, when explosion-proof piece 2 welds with casing 1, can avoid welding the risk that the welding slag or sharp-pointed foreign matter that the welding formed punctures electrode subassembly 3.

Embodiment 1 also provides an electric device, and the technical solutions described in the embodiments of the present application are all applicable to various electric devices using batteries.

The powered device may be a vehicle 100, a cell phone, a portable device, a laptop, a boat, a spacecraft, an electric toy, an electric tool, and the like. The vehicle 100 may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a range-extended vehicle, etc.; spacecraft include aircraft, rockets, space shuttles, and spacecraft, among others; electric toys include stationary or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric airplane toys, and the like; the electric power tools include metal cutting electric power tools, grinding electric power tools, assembly electric power tools, and electric power tools for railways, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators, and electric planers. The embodiment of the present application does not specifically limit the above-mentioned electric devices.

For convenience of description, the following embodiments will be described by taking an electric device as the vehicle 100.

For example, as shown in fig. 1, which is a schematic structural diagram of a vehicle 100 according to an embodiment of the present disclosure, the vehicle 100 may be a fuel-oil vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid electric vehicle, or an extended range vehicle. The vehicle 100 may be provided with a motor, a controller for controlling the battery 101 to supply power to the motor, and a battery 101 inside. For example, the battery 101 may be provided at the bottom or the head or tail of the vehicle 100. The battery 101 may be used for powering the vehicle 100, for example, the battery 101 may be used as an operating power source for the vehicle 100 for circuitry of the vehicle 100, for example, for power requirements for operation during start-up, navigation, and operation of the vehicle 100. In another embodiment of the present application, the battery 101 may be used not only as an operating power source of the vehicle 100, but also as a driving power source of the vehicle 100, instead of or in part replacing fuel or natural gas to provide driving power for the vehicle 100.

In order to meet different power requirements, the battery may include a plurality of battery cells, wherein the plurality of battery cells may be connected in series or in parallel or in series-parallel, and the series-parallel refers to a mixture of series connection and parallel connection. The battery may also be referred to as a battery pack. In some embodiments, a plurality of battery cells may be connected in series or in parallel or in series-parallel to form a battery module, and a plurality of battery modules may be connected in series or in parallel or in series-parallel to form a battery. That is, a plurality of battery cells may directly constitute a battery, or a battery module may be first constituted and then a battery may be constituted.

Furthermore, it should be understood that although the specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it is to be understood that all embodiments described herein may be combined as a whole by one or more of the claims, to form other embodiments as would be understood by one or more of ordinary skill in the art.

Variations and modifications to the above-described embodiments may become apparent to those skilled in the art from the disclosure and teachings of the above description. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious modifications, replacements or variations made by those skilled in the art on the basis of the present invention belong to the protection scope of the present invention. Furthermore, although specific terms are employed herein, such terms are used for convenience of description and are not to be construed as limiting the invention in any way.

Claims (10)

1. A power battery is characterized in that: comprises that

The explosion-proof device comprises a shell (1), wherein an explosion-proof sheet (2) is arranged at the bottom of the shell (1);

the electrode assembly (3), electrode assembly (3) set up in casing (1), electrode assembly (3) be provided with storage tank (31) that explosion-proof piece (2) correspond, just the forward projection area of storage tank (31) is more than or equal to the forward projection area of explosion-proof piece (2).

2. A power cell according to claim 1, wherein: the bottom of the shell (1) is formed with a convex part (11) in an inward protruding mode along the thickness direction of the shell, and the convex part (11) is accommodated in the inner cavity of the accommodating groove (31).

3. A power cell according to claim 1, wherein: the explosion-proof piece (2) comprises a main body part (21) and a concave part (22) formed by inwards recessing the main body part (21) along the thickness direction of the main body part, and the concave part (22) and the main body part (21) are coaxially arranged.

4. A power cell according to claim 1, wherein: still include protection sheet (4), protection sheet (4) are the slice, just protection sheet (4) set up explosion-proof piece (2) dorsad on an terminal surface of electrode subassembly (3).

5. A power cell according to claim 2, wherein: the height of the convex part (11) is h1, the depth of the accommodating groove (31) is h2, wherein the h1 and the h2 satisfy the relation: h1 is more than or equal to 0.1mm and less than or equal to h2 is more than or equal to 5mm.

6. A power cell according to claim 2, wherein: the length of the convex part (11) is L1, the length of the accommodating groove (31) is L2, and L1 and L2 satisfy the relation: l1 is more than or equal to 1mm and less than or equal to L2 is more than or equal to 80mm.

7. A power cell according to claim 2, wherein: the width of the convex part (11) is D1, the width of the accommodating groove (31) is D2, wherein D1 is larger than or equal to 1mm and D2 is larger than or equal to 80mm.

8. A power cell according to claim 1, wherein: the electrode assembly (3) is of a wound or laminated construction.

9. A power cell according to claim 1, wherein: the accommodating groove (31) is square, circular or elliptical.

10. An electric device comprising the power battery according to any one of claims 1 to 9.

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