CN220291008U

CN220291008U - High-multiplying-power lithium ion explosion-proof battery

Info

Publication number: CN220291008U
Application number: CN202321840540.1U
Authority: CN
Inventors: 盛琦; 于力; 阮红林; 夏润; 于昊诚
Original assignee: Wuhan Haocheng Lithium Technology Co ltd
Current assignee: Wuhan Haocheng Lithium Technology Co ltd
Priority date: 2023-07-13
Filing date: 2023-07-13
Publication date: 2024-01-02
Anticipated expiration: 2033-07-13

Abstract

The utility model belongs to the technical field of explosion prevention of lithium ion batteries, and discloses a high-rate lithium ion explosion prevention battery, which comprises a shell, a battery cell and a top cover, wherein the shell is cylindrical, one end of the shell is provided with a first opening, the shell comprises a bottom plate and a side plate, the side plate is connected to the bottom plate along the circumferential direction of the bottom plate, a containing cavity is formed in the shell, the bottom plate comprises a plurality of notch parts which are arranged at intervals, the plurality of notch parts are uniformly arranged at intervals along the circumferential direction of the bottom plate, the centers of the plurality of notch parts are connected with each other to form a first circle, the center of the first circle overlaps with the center of the bottom plate, the plurality of notch parts are all provided with notches, the plurality of notches are uniformly arranged at intervals along the circumferential direction of the bottom plate and overlap with the first circle, the battery cell is placed in the containing cavity, and the top cover is connected to the first opening in a sealing manner. Through above-mentioned structure setting, can guarantee at the pressure release in-process, the tensile strength that the different positions of casing received is the same, and the uniformity of control pressure release avoids the casing to receive the secondary damage at the pressure release in-process.

Description

High-multiplying-power lithium ion explosion-proof battery

Technical Field

The utility model relates to the technical field of explosion prevention of lithium ion batteries, in particular to a high-magnification lithium ion explosion-proof battery.

Background

The lithium ion battery is the most widely applied battery in the chemical power supply at present, and compared with other secondary batteries, the lithium ion battery has the advantages of high working voltage, long cycle life, convenient use and maintenance, strong adaptability and the like, the high-rate lithium ion battery generally refers to a lithium ion battery with continuous discharge current of more than or equal to 3C, and the lithium ion battery is a high-rate rechargeable battery which works by moving lithium ions between positive and negative electrodes, and Li is added in the charging and discharging processes ⁺ The lithium ion battery is characterized in that the lithium ion battery is embedded and separated between two electrodes, and can be designed into a soft-package battery, a cylindrical battery, a button battery and the like according to different use scenes, the leakage risk of the cylindrical battery is small, the reliability is higher, but the risk of explosion exists because the internal pressure cannot be discharged, and the lithium ion battery is used for realizing high-rate discharge, so that the reaction area of a pole piece is enlarged, the reaction speed of the chemical reaction inside the lithium ion battery is increased, the battery is easier to instantaneously release heat and then explode, the safety coefficient is low, and measures are needed to be taken.

The existing solution is to design a pressure relief groove with a straight-line or cross-shaped structure on a battery shell, and also to design a more complex structure on the battery shell according to a part of the solution, but in the pressure relief process, the tensile strength received by different positions of the shell is different, the consistency of pressure relief cannot be controlled, the risk of secondary damage of the shell is increased, and the use safety cannot be ensured.

Accordingly, there is a need for an apparatus that solves the above-mentioned problems.

Disclosure of Invention

The utility model aims to provide a high-magnification lithium ion explosion-proof battery, which is characterized in that in the pressure release process, the tensile strength box bodies are arranged at different positions of the shell, so that the pressure release consistency can be ensured, and the secondary damage of the shell is avoided.

To achieve the purpose, the utility model adopts the following technical scheme:

a high-rate lithium ion explosion-proof battery, comprising:

the shell is cylindrical, a first opening is formed in one end of the shell, the shell comprises a bottom plate and a side plate, the side plate is connected to the bottom plate along the circumferential direction of the bottom plate, a containing cavity is formed in the shell, the bottom plate comprises a plurality of notch parts which are arranged at intervals, the notch parts are uniformly arranged at intervals along the circumferential direction of the bottom plate, the centers of the notch parts are connected to form a first circle, the center of the first circle is overlapped with the center of the bottom plate, the notch parts are provided with notches, the notches are uniformly arranged at intervals along the circumferential direction of the bottom plate, and the notches are overlapped with the first circle;

the battery cell is arranged in the accommodating cavity;

and the top cover is connected with the first opening in a sealing way.

Preferably, a blocking portion is disposed between two adjacent scoring portions, a plurality of blocking portions are centrosymmetric and concave inwards, and a plurality of blocking portions overlap the first circle.

Preferably, the first circle may divide the bottom plate into an inner central region and an outer edge region, the central region protruding outward and being spaced apart from the plurality of barrier portions.

Preferably, the score is provided on an outer surface/inner surface of the score part.

Preferably, the thickness of the bottom plate is 0.25-0.3mm, and the depth of the notch is 0.15-0.17mm.

Preferably, the cross-sectional shape of the score is trapezoidal, rectangular or triangular.

Preferably, the battery cell includes a positive electrode tab and a negative electrode tab, both of which are disposed at a side close to the first opening.

Preferably, the positive electrode tab is connected to the top cover, and the negative electrode tab is connected to an end of the side plate and the top cover.

Preferably, the bottom plate and the side plate are of a unitary structure.

Preferably, the top cover is welded to the housing.

The beneficial effects are that: the utility model provides a high-multiplying power lithium ion explosion-proof battery, which comprises a shell, a battery cell and a top cover, wherein the shell is cylindrical, one end of the shell is provided with a first opening, the shell comprises a bottom plate and a side plate, the side plate is connected with the bottom plate along the circumferential direction of the bottom plate, a containing cavity is formed in the shell, the bottom plate comprises a plurality of notch parts which are arranged at intervals, the notch parts are uniformly arranged at intervals along the circumferential direction of the bottom plate, the centers of the notch parts are connected with each other to form a first circle, the center of the first circle is overlapped with the center of the bottom plate, the notch parts are provided with notches, the notches are uniformly arranged at intervals along the circumferential direction of the bottom plate, the notch parts are overlapped with the first circle, the battery cell is arranged in the containing cavity, and the top cover is connected with the first opening in a sealing manner. Through above-mentioned structure setting, can guarantee at the pressure release in-process, the tensile strength that the different positions of casing received is the same, and the uniformity of control pressure release avoids the casing to receive the secondary damage at the pressure release in-process.

Drawings

Fig. 1 is a schematic structural diagram of a high-rate lithium ion explosion-proof battery according to an embodiment of the present utility model;

fig. 2 is a cross-sectional view of a high-rate lithium ion explosion-proof battery provided by an embodiment of the present utility model;

FIG. 3 is an enlarged schematic view at A in FIG. 2;

fig. 4 is a schematic structural view of a base plate according to an embodiment of the present utility model.

In the figure: 1. a housing; 11. a bottom plate; 111. a notched portion; 1111. scoring; 112. a blocking portion; 113. a central region; 114. an edge region; 12. a side plate; 2. and a top cover.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

The utility model provides a high-rate lithium ion explosion-proof battery, which comprises a shell 1, an electric core and a top cover 2, wherein the shell 1 is cylindrical, one end of the shell is provided with a first opening, a containing cavity is formed in the shell 1, the electric core is placed in the containing cavity, and concretely, the electric core can be filled into the containing cavity through the first opening, the top cover 2 is connected to the first opening in a sealing manner, and the high-rate lithium ion explosion-proof battery provided by the embodiment can ensure that the tensile strength received by different positions of the shell 1 is the same in the pressure release process, control the pressure release consistency and avoid the secondary damage of the shell 1 in the pressure release process.

Specifically, the casing 1 includes a bottom plate 11 and a side plate 12, the bottom plate 11 is circular, and the end of the side plate 12 is connected to the bottom plate 11 along the circumference of the bottom plate 11, so as to form a containing cavity, specifically, the bottom plate 11 and the side plate 12 are integrally formed, further, as shown in fig. 3 and 4, the bottom plate 11 includes a plurality of nicks 111 arranged at intervals, the nicks 111 are uniformly arranged at intervals along the circumference of the bottom plate 11, when the centers of the nicks 111 are connected, a first circle can be formed on the bottom plate 11, and the center of the first circle overlaps with the center of the bottom plate 11, so that the tensile strength of each nick 111 is identical in the pressure release process.

Preferably, the bottom plate 11 and the side plate 12 in this embodiment are of an integral structure, and have strong anti-pressure, so as to meet the explosion-proof requirement, and the thickness of the bottom plate 11 is 0.25-0.3mm, and the depth of the notch 1111 is 0.15-0.17mm.

Illustratively, in this embodiment, three scoring portions 111 are provided, the three scoring portions 111 are designed in a triangle-centered symmetrical manner, and the center of the triangle-centered symmetrical design overlaps the center of the base plate 11, so as to achieve the same tensile strength experienced by the three scoring portions 111.

Further, as shown in fig. 4, in this embodiment, the notch 1111 is disposed on the outer surface of the notch 111, the depth of the notch 1111 is 0.15-0.17mm, the cross-section of the notch 1111 is isosceles trapezoid, the width of the bottom of the notch 1111 is smaller than the width of the top of the notch 1111, specifically, the width of the bottom of the notch 1111 is 0.1mm, and the included angle between the side edge of the notch 1111 and the bottom of the notch 1111 is 60 °.

In other alternative embodiments, the score 1111 is disposed on the inner surface of the score portion 111, and the cross-sectional shape of the score 1111 may be configured in other trapezoid, rectangle or triangle, which is not particularly limited herein.

Preferably, the blocking portions 112 are disposed between two adjacent scoring portions 111, and the plurality of blocking portions 112 are centrosymmetric and concave inwards, and meanwhile, the plurality of blocking portions 112 can overlap the first circle, that is, the plurality of scoring portions 111 and the plurality of blocking portions 112 are connected in a staggered manner, the centers of the plurality of scoring portions 111 and the plurality of blocking portions 112 are sequentially connected to form the first circle on the bottom plate 11, and further preferably, the plurality of blocking portions 112 are concave towards the inside of the shell 1, when the pressure inside the shell 1 is gradually increased to a certain value, the plurality of blocking portions 112 are firstly spread to be flush with the scoring portions 111, so that the risk of explosion of the battery can be effectively reduced.

Preferably, the two ends of the score 1111 of each score portion 111 respectively extend and cross to the two barrier portions 112 adjacent thereto, so that the score 1111 is opened under high pressure to open the opening.

Through the above structure arrangement, when the surfaces of the plurality of blocking portions 112 are propped open until the surfaces are flush with the notch portion 111, and the pressure inside the casing 1 is continuously increased, the notch 1111 is opened first, and then the openings of the plurality of notches 1111 extend to the junction, so that the falling of part of the bottom plate 11 can be avoided, and the effect of reducing the burst hazard is achieved.

In this embodiment, the plurality of score portions 111 and the plurality of barrier portions 112 are formed by secondary stamping, specifically, the base plate 11 is first stamped from the outside to form an annular groove recessed inward, and further, the base plate 11 is second stamped from the inside to form the plurality of score portions 111, it should be noted that the surfaces of the plurality of score portions 111 are flush with the surfaces of other areas of the annular groove on the base plate 11, and the annular groove formed by the primary stamping and the first circle substantially overlap. In other embodiments, the plurality of score portions 111 and the plurality of barrier portions 112 may also be formed by one stamping.

For example, the first circle in the present embodiment can divide the base plate 11 into a central area 113 and an edge area 114, the central area 113 is spaced apart from the plurality of blocking portions 112, the edge area 114 is a circular ring at the periphery of the base plate 11, in the present embodiment, the central area 113 protrudes outwards, that is, the outer surface of the central area 113 protrudes outwards compared with the outer surfaces of other areas of the base plate 11, and the inner surface of the central area 113 is recessed outwards compared with the inner surfaces of other areas of the base plate 11, so as to fix the battery cells in the accommodating cavity.

Further, the battery cell in this embodiment is formed by winding a positive electrode plate, a negative electrode plate and a diaphragm, specifically, the diaphragm is made of PP material, and the diaphragm is sandwiched between the positive electrode plate and the negative electrode plate, and the positive electrode plate is made of one, two or three of lithium cobaltate, lithium manganate and lithium nickelate and added with a binder PVDF and a conductive agent SP, and when two of lithium cobaltate, lithium manganate and lithium nickelate are adopted, the ratio is 1:1, and when three of lithium cobaltate, lithium manganate and lithium nickelate are adopted, the ratio can be 5:2:3, 8:1:1 or 1:1, and the negative electrode plate is made of graphite, conductive carbon black and added with a binder SBR and/or CMC.

Specifically, be equipped with the anodal utmost point ear on the anodal pole piece, be equipped with the negative pole utmost point ear on the negative pole piece for realize the electricity of electric core and connect, preferably, all set up anodal utmost point ear and negative pole utmost point ear in one side that is close to first open-ended, connect anodal utmost point ear in the bottom of top cap 2 through resistance welding's mode simultaneously, place the negative pole utmost point ear in first open-ended department again, and use top cap 2 to weld the negative pole utmost point ear in curb plate 12 and top cap 2 behind its gland. Compared with the prior art, the structure avoids the pressure of welding the positive electrode tab and the negative electrode tab on the bottom plate 11, and ensures that the tensile strength of different positions of the shell 1 in the pressure relief process is the same.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims

1. The high multiplying power type lithium ion explosion-proof battery is characterized by comprising:

the shell (1), the shell (1) is cylindric and one end is equipped with first opening, the shell (1) includes bottom plate (11) and curb plate (12), curb plate (12) are followed the circumference of bottom plate (11) connect in bottom plate (11), be formed with in the shell (1) and hold the chamber, bottom plate (11) include a plurality of nicks portion (111) that the interval set up, a plurality of nicks portion (111) are followed the circumference of bottom plate (11) evenly spaced sets up, connect a plurality of nicks portion (111) the center can form first circle, the centre of a circle overlaps with the center of bottom plate (11), a plurality of nicks portion (111) all are equipped with nicks (1111), a plurality of nicks (1111) are followed the circumference of bottom plate (11) evenly spaced sets up, and a plurality of nicks (1111) all overlap in first circle;

the battery cell is arranged in the accommodating cavity;

and the top cover (2) is hermetically connected with the first opening.

2. The high-rate lithium ion explosion-proof battery according to claim 1, wherein a blocking portion (112) is disposed between two adjacent scoring portions (111), a plurality of blocking portions (112) are centrosymmetric and concave inwards, and a plurality of blocking portions (112) are overlapped on the first circle.

3. The high-rate lithium-ion explosion-proof battery according to claim 2, wherein the first circle is capable of dividing the bottom plate (11) into an inner central region (113) and an outer edge region (114), the central region (113) protruding outward and being spaced apart from the plurality of barrier portions (112).

4. The high-rate lithium ion explosion-proof battery according to claim 1, wherein the score (1111) is provided on an outer/inner surface of the score portion (111).

5. The high-rate lithium ion explosion-proof battery according to claim 1, wherein the thickness of the bottom plate (11) is 0.25-0.3mm, and the depth of the score (1111) is 0.15-0.17mm.

6. The high-rate lithium-ion explosion-proof battery according to any one of claims 1 to 5, wherein the cross-sectional shape of the score (1111) is trapezoidal, rectangular or triangular.

7. The high-power lithium-ion explosion-proof battery according to any one of claims 1 to 5, wherein the battery cell comprises a positive electrode tab and a negative electrode tab, both of which are disposed on a side close to the first opening.

8. The high-rate lithium ion explosion-proof battery according to claim 7, wherein the positive electrode tab is connected to the top cover (2), and the negative electrode tab is connected to an end of the side plate (12) and the top cover (2).

9. The high-rate lithium ion explosion-proof battery according to any one of claims 1 to 5, wherein the bottom plate (11) and the side plate (12) are of a unitary structure.

10. The high-rate lithium-ion explosion-proof battery according to any one of claims 1 to 5, wherein the top cover (2) is welded to the case (1).