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CN-116799343-B - Energy storage device and electric equipment

CN116799343BCN 116799343 BCN116799343 BCN 116799343BCN-116799343-B

Abstract

The application discloses an energy storage device and electric equipment, and relates to the technical field of energy storage. The energy storage device comprises a shell, an electrode assembly, a battery top cover, a battery and an air suction structure, wherein the shell comprises an accommodating cavity with an opening, the electrode assembly is accommodated in the accommodating cavity and forms an air passing gap with the inner wall of the shell, the battery top cover comprises a cover plate and an insulating part, the insulating part is positioned between the opening end of the accommodating cavity and the cover plate, the insulating part is provided with a convex part opposite to the air passing gap, the convex part is provided with a limiting hole, the air suction structure is of a columnar structure, the first end of the air suction structure is provided with a limiting structure and is limited in the limiting hole, the second end of the air suction structure is positioned in the air passing gap, the air passing channel is also provided with a cavity and an air passing channel, the cavity is communicated with the accommodating cavity, and the air suction agent is filled in the cavity. In the embodiment of the application, the getter filled in the getter structure absorbs the gas generated by the energy storage device, so that the problem of expansion of the energy storage device is reduced, the problem of poor performance of the energy storage device is reduced, and the safety performance of the energy storage device is improved.

Inventors

  • CHEN ZHIXIONG
  • HONG CHUNSHENG

Assignees

  • 厦门海辰储能科技股份有限公司

Dates

Publication Date
20260508
Application Date
20230605

Claims (10)

  1. 1. An energy storage device, comprising: A housing (10) comprising a receiving chamber (11) having an opening (12); An electrode assembly (20) which is accommodated in the accommodating chamber (11) and forms an air-passing gap (22) with the inner wall of the housing (10); a battery top cover (40) including a cover plate (41) and an insulating member (42), the cover plate (41) covering and sealing an opening (12) of the accommodation chamber (11), the insulating member (42) being located between an open end of the accommodation chamber (11) and the cover plate (41), and the insulating member (42) having a convex portion (43) facing the air-passing gap (22), the convex portion (43) having a limiting hole (431); The air suction structure (30) is of a columnar structure, a first end of the air suction structure (30) is provided with a limiting structure (32), the limiting structure (32) is limited in the limiting hole (431), a second end of the air suction structure (30) is located in the air passing gap (22), the air suction structure (30) is further provided with a cavity (31) and an air passing channel, the air passing channel is communicated with the cavity (31) and the accommodating cavity (11), and the cavity (31) is filled with a getter, and the getter is used for absorbing gas; The gas passing channel comprises a plurality of first gas passing holes (321) positioned on the side wall of the gas suction structure (30), wherein the first gas passing holes (321) contain solid-phase inert plugging agent, and the melting temperature of the inert plugging agent is more than or equal to 46 ℃ and less than or equal to 58 ℃.
  2. 2. Energy storage device according to claim 1, characterized in that the side wall of the first end of the suction structure (30) is provided with an annular groove (33), the portion of the annular groove (33) between the wall of the cover plate (41) adjacent to the end face of the first end of the suction structure (30) and the end face of the suction structure (30) forming the limit structure (32), the wall of the limit hole (431) having a limit face facing the cover plate (41); the groove wall of the annular groove (33) close to the cover plate (41) is abutted with the limiting surface, and the groove wall of the annular groove (33) far away from the cover plate (41) is abutted with the surface of the convex part (43) far away from the cover plate (41).
  3. 3. The energy storage device according to claim 1, wherein the air passage comprises a plurality of groups of first air holes (321), the plurality of groups of first air holes (321) are distributed along the length direction of the air suction structure (30), and the first air holes (321) included in each group are distributed along the circumferential direction of the air suction structure (30).
  4. 4. A power storage device according to claim 3, characterized in that each set of the first air holes (321) comprises a first air hole (321) with an opening towards the broad side of the housing (10) and a first air hole (321) with an opening towards the long side of the housing (10).
  5. 5. A device according to claim 3, wherein, of the two sets of first air passing holes (321) adjacent in the longitudinal direction of the air intake structure (30), a set of first air passing holes (321) included near the battery top cover (40) has a smaller circumferential cross-sectional area than a set of first air passing holes (321) included far from the battery top cover (40).
  6. 6. The energy storage device according to claim 1, wherein the wall of the first air vent (321) comprises a bottom plane (325) remote from the battery top cover (40), the end of the bottom plane (325) facing away from the cavity (31) being inclined in a direction facing away from the battery top cover (40).
  7. 7. The energy storage device according to any of the claims 1-6, wherein the air passage further comprises a second air passage hole (322) located at the second end of the air suction structure (30) and penetrating the end surface of the second end, and the second air passage hole (322) communicates the cavity (31) with the accommodating cavity (11).
  8. 8. The energy storage device according to any of claims 1-6, wherein the cross-sectional area of the cavity (31) along a direction perpendicular to the length direction of the getter structure (30) increases in a direction towards the battery top cover (40).
  9. 9. An energy storage device as defined in any of claims 1-6, wherein said getter comprises activated carbon particles.
  10. 10. An electrical device, characterized in that it comprises an energy storage device according to any of the preceding claims 1-9, said energy storage device powering said electrical device.

Description

Energy storage device and electric equipment Technical Field The application relates to the technical field of energy storage, in particular to an energy storage device and electric equipment. Background The lithium battery is used as a new energy battery, has the advantages of high energy density, long cycle life, good safety, green and environment protection and the like, and is widely applied. As the demand for lithium batteries increases, the performance requirements of the lithium batteries in all aspects are increasing, especially with respect to cycle performance and safety performance. In the related art, a lithium battery is generally composed of a battery top cover, an electrode assembly, and a case. The actual production process is to manufacture a battery top cover, an electrode assembly and a shell respectively, then use metal connectors to weld electrode columns of the battery top cover and electrode lugs of the electrode assembly respectively, then put the electrode assembly into the shell, and then use the battery top cover to cover an opening of the shell and then weld and seal the opening so as to form a basic structure of the lithium battery. Then, the electrolyte is injected manually through the electrolyte injection Kong Jiazhu arranged on the top cover of the battery, and the electrolyte injection hole is welded and sealed after the completion. In the recycling process of the lithium battery, gas is generated due to various reasons such as decomposition of electrolyte, exceeding of moisture in the shell, and the like, so that the cycle life and the rate performance are poor, too many lithium ions are easily dissociated on the surface of a pole piece of the electrode assembly along with the increase of the gas in the shell, dendritic crystals are formed in the long time, and when the dendrites grow to a certain length, the separator is easily pierced, so that the short circuit occurs in the lithium battery, and the safety performance is greatly reduced. Disclosure of Invention The application aims to provide an energy storage device and electric equipment, which avoid the influence of generated gas on cycle life and multiplying power performance. In order to achieve the purposes of the application, the application adopts the following technical scheme: According to one aspect of the present application, there is provided an energy storage device comprising: a housing including a receiving chamber having an opening; an electrode assembly accommodated in the accommodation chamber and forming an air-passing gap with an inner wall of the case; the battery top cover comprises a cover plate and an insulating piece, wherein the cover plate covers and seals the opening of the accommodating cavity, the insulating piece is positioned between the opening end of the accommodating cavity and the cover plate, the insulating piece is provided with a convex part which is opposite to the gas passing gap, and the convex part is provided with a limiting hole; the structure of breathing in, be columnar structure, the first end of structure of breathing in has limit structure, just limit structure is spacing in the spacing downthehole, the second end of structure of breathing in is located in the clearance of wandering away, the structure of breathing in still has cavity and the passageway of wandering away, the passageway of wandering away communicates the cavity with hold the chamber, the cavity intussuseption is filled with the getter, the getter is used for absorbing gas. In the embodiment of the application, the getter filled in the cavity of the getter structure absorbs the gas generated by the energy storage device, so that the contact effect of the positive plate, the negative plate and the diaphragm of the electrode assembly is ensured, the problem that the energy storage device expands due to the generated gas is reduced, the problem that the cycle life, the multiplying power performance and the like of the energy storage device are poor is also reduced, the problem that excessive lithium ions are dissociated on the surface of the electrode assembly due to the gas accumulated in the accommodating cavity, the problem of short circuit of the electrode assembly is also reduced, and the safety performance of the energy storage device is improved. In addition, because the spacing hole spacing of air suction structure and insulating part is connected for air suction structure is in the suspension state, has avoided the bottom of air suction structure and the contact of casing bottom like this, and then can effectively reduce the long-term contact electrolyte of the part that the battery top cap was kept away from to the getter of cavity intussuseption and takes place the rotten condition, thereby effectively promote the whole effect of breathing in of getter. According to one embodiment of the application, the side wall of the first end of the air suction structure is provided with an annular groove, th