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KR-102963660-B1 - Battery cells, batteries, and electrical devices

KR102963660B1KR 102963660 B1KR102963660 B1KR 102963660B1KR-102963660-B1

Abstract

The present application relates to battery cells, batteries, and electrical devices and belongs to the field of battery manufacturing technology. The present application provides a battery cell comprising: a housing; a pressure relief member installed on a first wall of the housing; an electrode assembly installed inside the housing; an electrolyte immersing the electrode assembly; a packaging member and an active material installed inside the housing. The packaging member is used to package the active material on the side near the first wall of the electrode assembly, and the packaging member is configured to operate to release the active material when the internal pressure or temperature of the battery cell reaches a first critical value, and the active material may react with the electrolyte and/or the electrode assembly to increase the internal pressure or temperature of the battery cell and thereby activate the pressure relief member. The battery cell according to the present application has better safety performance because it can rapidly release internal temperature and pressure when thermal runaway occurs. The present application also provides a battery and an electrical device comprising the battery cell.

Inventors

  • 천 스롱
  • 양 퍄오퍄오
  • 천 샤오보
  • 리 야오
  • 후 루

Assignees

  • 컨템포러리 엠퍼렉스 테크놀로지 (홍콩) 리미티드

Dates

Publication Date
20260511
Application Date
20210930

Claims (17)

  1. In battery cells, Housing; A pressure relief member installed on the first wall of the above housing; An electrode assembly installed inside the above housing; Electrolyte for immersing the above electrode assembly; A packaging member and an active substance installed inside the above housing; Includes, The above packaging member is used to package the active material on the side near the first wall of the electrode assembly, and The above packaging member is configured to operate to release the active material when the internal pressure or temperature of the battery cell reaches a first threshold value, and The above active material chemically reacts with the electrolyte and/or the electrode assembly to increase the internal pressure or temperature of the battery cell, thereby activating the pressure relief member, and The above packaging member has a first receiving cavity that corresponds in position to the pressure relief member, and at least a portion of the active material is packaged within the first receiving cavity. The first wall is rectangular, and the packaging member further comprises two second receiving cavities, the two second receiving cavities being located on each side of the first receiving cavity along the length direction of the first wall, and A battery cell characterized in that some of the active materials are packaged within the first receiving cavity and other parts are packaged within the two second receiving cavities.
  2. In paragraph 1, The above pressure relief member is configured to operate to release pressure when the internal pressure or temperature of the battery cell reaches a second threshold value, and the battery cell is characterized in that the second threshold value is greater than the first threshold value.
  3. In paragraph 1, A battery cell characterized in that the above active substance is an oxidizing agent.
  4. In paragraph 3, A battery cell characterized by the above active material comprising at least one of potassium permanganate, potassium dichromate, sodium hypochlorite, hydrogen peroxide, lead dioxide, periodic acid, cobalt fluoride, and sodium perferrate.
  5. In paragraph 1, A battery cell characterized in that the above packaging member packages at least a portion of the active material at a position corresponding to the pressure relief member.
  6. In paragraph 5, A battery cell characterized in that the above housing has a pressure relief port installed therein, the pressure relief member and the packaging member both cover the pressure relief port, the packaging member is installed on the side of the pressure relief member closer to the electrode assembly, and the packaging member, the pressure relief member, and the wall of the pressure relief port together define a sealed space that accommodates the active material.
  7. In paragraph 6, A battery cell characterized in that the pressure relief member and the packaging member are both plate-shaped.
  8. In paragraph 5, A battery cell characterized in that the above-mentioned packaging member is made of an insulating material, and the above-mentioned packaging member is installed between the first wall and the electrode assembly to insulate the electrode assembly from the first wall.
  9. delete
  10. In paragraph 1, A battery cell characterized in that the first receiving cavity has a first opening, and the first wall and the pressure relief member together close the first opening.
  11. delete
  12. In paragraph 1, A battery cell characterized in that the second receiving cavity has a second opening, and the first wall closes the second opening.
  13. In paragraph 1, A battery cell characterized in that the housing comprises a housing body and a cover, the housing body has an opening, the housing body includes a side wall and a bottom wall, the bottom wall and the opening are installed facing each other, the cover is connected to the side wall and covers the opening, and the first wall is the cover, the bottom wall, or the side wall.
  14. Regarding batteries, A battery characterized by including a battery cell according to any one of claims 1 to 8, 10, and 12 to 13.
  15. In electrical equipment, An electric device characterized by including a battery according to Clause 14.
  16. In a method for manufacturing a battery cell, Step of providing a housing - a pressure relief member is installed on the first wall of the housing - ; Step of providing an electrode assembly; Step of providing an electrolyte; Step of providing a packaging member and an active substance - the packaging member is used to package the active substance, and the packaging member is configured to operate to release the active substance when the internal pressure or temperature of the battery cell reaches a first critical value, and the active substance may chemically react with the electrolyte and/or the electrode assembly to increase the internal pressure or temperature of the battery cell and thereby operate the pressure relief member - ; and A step of placing the electrode assembly within the housing, packaging the active substance with the packaging member on the side near the first wall of the electrode assembly, and injecting the electrolyte into the housing; Includes, The above packaging member has a first receiving cavity that corresponds in position to the pressure relief member, and at least a portion of the active material is packaged within the first receiving cavity. The first wall is rectangular, and the packaging member further comprises two second receiving cavities, the two second receiving cavities being located on each side of the first receiving cavity along the length direction of the first wall, and A method for manufacturing a battery cell characterized in that some of the active materials are packaged in the first receiving cavity and other parts are packaged in two second receiving cavities.
  17. delete

Description

Battery cells, batteries, and electrical devices This application relates to the field of battery manufacturing technology, and in particular to battery cells, batteries, and electrical devices. With the rapid development of the new and renewable energy vehicle industry, the technological level of the lithium battery industry is also rapidly improving, and requirements for the safety performance of battery cells are increasing. If thermal runaway occurs in a battery cell, the internal temperature and pressure rise rapidly, and if the internal temperature and pressure are not released in time, the battery cell may explode, causing a serious safety accident. Hereinafter, in order to more clearly explain the technical solution of the embodiments of the present application, the embodiments will be briefly introduced with respect to the drawings necessary for such description. The drawings below represent only some embodiments of the present application and should not be construed as limiting the scope, and it is evident to those skilled in the art that other related drawings can be obtained based on these drawings without creative effort. FIG. 1 shows a simple schematic diagram of a vehicle according to one embodiment of the present application. Figure 2 shows a schematic diagram of the structure of the vehicle battery illustrated in Figure 1. FIG. 3 shows a schematic diagram of the structure of a first type of battery cell according to some embodiments of the present application. FIG. 4 shows a schematic diagram of the structure of a battery cell cover illustrated in FIG. 3, in which electrode terminals, a pressure relief member, and a packaging member are connected. Figure 5 is a cross-sectional view of AA shown in Figure 4. FIG. 6 shows a schematic diagram of the structure of a second type of battery cell according to some embodiments of the present application. FIG. 7 shows a schematic diagram of the structure of a battery cell cover illustrated in FIG. 6, in which electrode terminals, a pressure relief member, and a packaging member are connected. Figure 8 is a cross-sectional view of the BB shown in Figure 7. FIG. 9 is a partial enlarged view of part C shown in FIG. 8 (showing the first receiving cavity of the first form). FIG. 10 shows a schematic diagram of the structure of the first receiving cavity of the second form of the battery cell shown in FIG. 6. FIG. 11 shows a schematic diagram of the structure of the first receiving cavity of the third form of the battery cell shown in FIG. 6. FIG. 12 shows a schematic diagram of the structure of a packaging member corresponding to the first receiving cavity of the third form of the battery cell shown in FIG. 11. Figure 13 is a partial enlarged view of part D shown in Figure 8. The above drawings were not provided in scale. To further clarify the purpose, technical solution, and advantages of the embodiments of this application, the technical solution of the embodiments of this application is described below with reference to the drawings attached to the embodiments of this application. It is evident that the embodiments described herein are merely some embodiments, not all embodiments of this application. All other embodiments obtained by a person skilled in the art without creative effort based on the embodiments of this application fall within the scope of protection of this application. Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as generally understood by those skilled in the art to which this application applies. The terms used in the specification of this application are used merely to describe specific embodiments and are not intended to limit this application. In the specification, claims, and drawings of this application, terms such as "comprising" and "having," and any variations thereof, are intended to describe non-exclusive inclusion. In the specification, claims, or drawings of this application, terms such as "first," "second," etc., are used to distinguish different objects and are not used to describe a specific order of objects. The term "Examples" as used in this application means that specific features, structures, or properties described together with the Examples may be included in at least one Example of this application. Wherever this word appears in various places in the specification, it does not necessarily refer to the same Example, nor does it refer to independent or alternative Examples that are mutually exclusive from another Example. It is understood by those skilled in the art, both explicitly and implicitly, that the Examples described in this application may be combined with other Examples. In the description of the embodiments of this application, technical terms such as 'installation,' 'connection,' 'linkage,' and 'attachment' should be understood in a broad sense unless otherwise clearly defined or limited. For example, they may be fixed connections, detacha