BATTERY, BATTERY PACK AND ELECTRIC EQUIPMENT

A battery includes a shell having an inner cavity; a wound core assembled in the inner cavity of the shell; a column supported in the wound core, wherein the column includes a first cavity for storing a lithium-replenishing medium and a second cavity for storing a fire-fighting medium, a cavity wall of the first cavity having a first hole, and a cavity wall of the second cavity having a second hole; a first membrane configured to block the first hole, and configured to break when subjected to a first pressure, allowing the lithium-replenishing medium in the first cavity to flow into the inner cavity; and a second membrane configured to block the second hole, and configured to break when subjected to a second pressure, allowing the fire-fighting medium in the second cavity to flow into the inner cavity, the second pressure being greater than the first pressure.

CROSS-REFERENCE TO RELATED APPLICATION

This application is based on and claims priority to Chinese Patent Application No. 202310407797.6 filed on Apr. 12, 2023, the entire content of which is incorporated herein by reference for all purposes.

FIELD

The present disclosure relates to the field of batteries, in particular to a battery, a battery pack using the battery, and electric equipment using the battery or the battery pack.

BACKGROUND

Batteries are energy storage devices that convert chemical energy into electric energy. In recent years, with the promotion of new energy, batteries are also applied in more and more fields. However, in the related art, single-cell batteries have problems such as the inability of realizing secondary replenishment of lithium ions, short battery life, and severe attenuation. Moreover, due to limited conditions, some batteries cannot be provided with explosion-proof valves, so that the single-cell batteries cannot implement effective gas exhaust, which weakens the safety of using the batteries.

SUMMARY

A battery according to embodiments of the present disclosure includes: a shell having an inner cavity; a wound core assembled in the inner cavity of the shell; a column supported in the wound core to prevent the wound core from collapsing, wherein the column includes a first cavity configured to store a lithium-replenishing medium and a second cavity configured to store a fire-fighting medium, a cavity wall of the first cavity having a first hole, and a cavity wall of the second cavity having a second hole; a first membrane configured to block the first hole, the first membrane being configured to break when subjected to a first pressure, allowing the lithium-replenishing medium in the first cavity to flow into the inner cavity through the first hole; and a second membrane configured to block the second hole, the second membrane being configured to break when subjected to a second pressure, allowing the fire-fighting medium in the second cavity to flow into the inner cavity through the second hole, wherein the second pressure is greater than the first pressure.

A battery pack according to embodiments of the present disclosure includes a batter. The battery includes: a shell having an inner cavity; a wound core assembled in the inner cavity of the shell; a column supported in the wound core to prevent the wound core from collapsing, wherein the column includes a first cavity configured to store a lithium-replenishing medium and a second cavity configured to store a fire-fighting medium, a cavity wall of the first cavity having a first hole, and a cavity wall of the second cavity having a second hole; a first membrane configured to block the first hole, the first membrane being configured to break when subjected to a first pressure, allowing the lithium-replenishing medium in the first cavity to flow into the inner cavity through the first hole; and a second membrane configured to block the second hole, the second membrane being configured to break when subjected to a second pressure, allowing the fire-fighting medium in the second cavity to flow into the inner cavity through the second hole, wherein the second pressure is greater than the first pressure.

Electric equipment according to embodiments of the present disclosure includes a battery or a battery pack including the battery. The battery includes: a shell having an inner cavity; a wound core assembled in the inner cavity of the shell; a column supported in the wound core to prevent the wound core from collapsing, wherein the column includes a first cavity configured to store a lithium-replenishing medium and a second cavity configured to store a fire-fighting medium, a cavity wall of the first cavity having a first hole, and a cavity wall of the second cavity having a second hole; a first membrane configured to block the first hole, the first membrane being configured to break when subjected to a first pressure, allowing the lithium-replenishing medium in the first cavity to flow into the inner cavity through the first hole; and a second membrane configured to block the second hole, the second membrane being configured to break when subjected to a second pressure, allowing the fire-fighting medium in the second cavity to flow into the inner cavity through the second hole, wherein the second pressure is greater than the first pressure.

REFERENCE NUMERALS

DETAILED DESCRIPTION

Embodiments of the present disclosure will be described in detail and examples of the embodiments are shown in accompanying drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present disclosure rather than limit the present disclosure.

As shown inFIGS.1and2, a battery according to the embodiments of the present disclosure includes a shell1, a wound core (not shown), a column2, a first membrane, and a second membrane.

The shell1has an inner cavity5. For example, the shell1has an integral structure and is generally columnar, and an inner space of the shell1forms the inner cavity5. When in use, the inner cavity5of the shell1is filled with electrolyte.

The wound core includes a positive pole piece, a negative pole piece, and a diaphragm between the positive pole piece and the negative pole piece. The wound core is a structure formed by winding the positive pole piece, the negative pole piece, and the diaphragm. When the battery, is assembled, the wound core is mounted in the inner cavity5of the shell1.

The column2is supported in the wound core to prevent the wound core from collapsing. The column2includes a first cavity21for storing a lithium-replenishing medium and a second cavity22for storing a fire-fighting medium. A cavity wall of the first cavity21has a first hole211, and a cavity wall of the second cavity22has a second hole221.

For example, there is a central hole in a center of the wound core, and the column2is inserted and fitted in the central hole. With the support of the column2, a situation that the wound core collapses towards the center can be avoided, and the structural strength and stability can be improved.

As shown inFIG.2, the column2has a hollow structure, and there are two closed cavities in the column2, which are the first cavity21and the second cavity22. The first cavity21and the second cavity22are spaced apart from each other along an axial direction (in an up-down direction) of the column2. In other embodiments, the first cavity21and the second cavity22are spaced apart from each other along a peripheral direction of the column2. For example, the first cavity21and the second cavity22are opposite to each other in a radial direction of the column2.

The first cavity21is used to store the lithium-replenishing medium that may be a lithium-replenishing agent (a lithium salt solution) or may be other types of media such as lithium powder in other embodiments. The second cavity22is used to store the fire-fighting medium that may be perfluorohexanone or may be a flame-retardant medium such as alkyl phosphate and heptafluoropropane in other embodiments.

As shown inFIG.2, the column2includes the first hole211and the second hole221that extend along the radial direction of the column2. The first hole211penetrates outer wall surfaces of the first cavity21and the column2, i.e., the first hole211makes the first cavity21be in connection with the inner cavity5of the shell1. The second hole221penetrates outer wall surfaces of the second cavity22and the column2, i.e., the second hole221makes the second cavity22be in connection with the inner cavity5of the shell1.

The first membrane (not shown) is arranged on the column2and seals the first hole211, so that the first hole211is blocked by the first membrane, thereby separating the first cavity21from the inner cavity5of the shell1. Similarly, the second membrane (not shown) is arranged on the column2and seals the second hole221, so that the second hole221is blocked by the second membrane, thereby separating the second cavity22from the inner cavity5of the shell1.

After long-term use of the battery, lithium ions in the battery will be consumed and become insufficient, and gas produced in the battery will increase and accumulate. When the gas increases to a certain extent, i.e., when a gas pressure in the shell1reaches a first pressure, the first membrane breaks under the action of the first pressure. At this time, the first cavity21is in connection with the inner cavity5of the shell1through the first hole211, and the lithium-replenishing medium in the first cavity21flows into the inner cavity5of the shell1through the first hole211. In such a way, the replenishment of lithium ion content in the electrolyte can be realized.

In addition, when the battery is out of thermal control or in a condition of rapid gas production due to abuse, the gas pressure in the shell1reaches a second pressure, and the second membrane breaks under the action of the second pressure. At this time, the second cavity22is in connection with the inner cavity5of the shell1through the second hole221, and the fire-fighting medium in the second cavity22flows into the shell1through the second hole221and plays a role in fire-fighting and extinguishing.

It should be noted that the second pressure is greater than the first pressure, so that the second membrane will not be damaged in normal use, i.e., the fire-fighting medium will not flow out of the second cavity22, thus ensuring the stability of using the battery.

The battery according to the embodiments of the present disclosure can realize secondary lithium replenishment and address the problems of short battery life and serious attenuation, and has fire control and fire extinguishing functions when the battery is out of thermal control or in the condition of rapid gas production, thus ensuring the safety of using the battery.

In some embodiments, the battery includes a third membrane, and the shell1includes a third cavity14for storing a lithium-replenishing medium. A cavity wall of the third cavity14has a third hole111, and the third membrane seals and blocks the third hole111. When the third membrane is subjected to a third pressure, the third membrane breaks, so that the lithium-replenishing medium in the third cavity14flows into the inner cavity5through the third hole111. The third pressure is smaller than the second pressure.

For example, the shell1is designed to have a sandwich-type structure with the third cavity14alone formed in a sandwiched space, and the shell1only has the third cavity14. The third hole111is in an inner wall of the shell1and extends along a radial direction of the shell1. The third hole111serves to connect the third cavity14with the inner cavity5of the shell1. The third membrane (not shown) is arranged on the inner wall of the shell1and seals the third hole111. Therefore, the third membrane can block the third hole111, thereby separating the third cavity14from the inner cavity5of the shell1.

As the produced gas accumulates in the battery, the third membrane will break under the action of the third pressure when the gas pressure reaches the third pressure. At this time, the third cavity14is in connection with the inner cavity5of the shell1through the third hole111, and the lithium-replenishing medium in the third cavity14flows into the inner cavity5of the shell1through the third hole111. In such a way, the replenishment of lithium ion content in the electrolyte can be realized.

It should be noted that the third pressure is smaller than the second pressure, so that the second membrane will not be damaged in normal use of the battery, and only a lithium replenishment effect can be realized. Moreover, the third pressure may be different from the first pressure, so that lithium can be replenished in a gradient manner. That is, with the increase of the gas pressure inside the battery, lithium ions in the electrolyte can be first replenished by the lithium-replenishing medium in one of the first cavity21and the third cavity14, and as the gas pressure continues to increase, lithium ions can be then replenished by the lithium-replenishing medium in the other of the first cavity21and the third cavity14.

In some embodiments, the battery includes a fourth membrane, and the shell1includes a fourth cavity15for storing a fire-fighting medium. A cavity wall of the fourth cavity15has a fourth hole112, and the fourth membrane blocks the fourth hole112. The fourth membrane breaks when subjected to a fourth pressure, so that the fire-fighting medium in the fourth cavity15flows into the inner cavity5through the fourth hole112. The fourth pressure is greater than the first pressure.

For example, the shell1is designed to have a sandwich-type structure with the fourth cavity15alone formed in a sandwiched space, and the shell1only has the fourth cavity15. The fourth hole112is in the inner wall of the shell1and extends along the radial direction of the shell1. The fourth hole112serves to connect the fourth cavity15with the inner cavity5of the shell1. The fourth membrane (not shown) is arranged on the inner wall of the shell1and seals the fourth hole112. Therefore, the fourth membrane can block the fourth hole112, thereby separating the fourth cavity15from the inner cavity5of the shell1.

As the produced gas accumulates in the battery, the fourth membrane will break under the action of the fourth pressure when the gas pressure reaches the fourth pressure. At this time, the fourth cavity15is in connection with the inner cavity5of the shell1through the fourth hole112, and the fire-fighting medium in the fourth cavity15flows into the inner cavity5of the shell1through the fourth hole112to implement fire control and fire extinguishing. It should be noted that the fourth pressure is greater than the first pressure, so that the fourth membrane will not be damaged in normal use of the battery. Moreover, the fourth pressure may be identical to or different from the second pressure.

In some embodiments, the battery includes the third membrane and the fourth membrane; and the shell1includes the third cavity14for storing the lithium-replenishing medium and the fourth cavity15for storing the fire-fighting medium. The cavity wall of the third cavity14has the third hole111, and the cavity wall of the fourth cavity15has the fourth hole112.

For example, the shell1includes two sealed cavities that are the third cavity14and the fourth cavity15. The third cavity14stores a lithium-replenishing medium that may be the same as the lithium-replenishing medium in the first cavity21. In other embodiments, the lithium-replenishing medium in the third cavity14may be different from the lithium-replenishing medium in the first cavity21, to avoid a situation that a single lithium-replenishing medium fails and cannot achieve the lithium replenishment effect, thus providing double assurance.

The fourth cavity15stores a fire-fighting medium that may be the same as the fire-fighting medium in the second cavity22. In other embodiments, the fire-fighting medium in the fourth cavity15may be different from the fire-fighting medium in the second cavity22, to avoid a situation that a single fire-fighting medium fails and cannot achieve a fire-fighting effect, thus providing double assurance.

The third hole111is in the inner wall of the shell1and extends along the radial direction of the shell1. The third hole111is configured to connect the third cavity14with the inner cavity5of the shell1. The fourth hole112is in the inner wall of the shell1and extends along the radial direction of the shell1. The fourth hole112is configured to connect the fourth cavity15with the inner cavity5of the shell1.

The third membrane (not shown) is arranged on the inner wall of the shell1and seals the third hole111. Therefore, the third membrane can block the third hole111, thereby separating the third cavity14from the inner cavity5of the shell1. Similarly, the fourth membrane (not shown) is arranged on the inner wall of the shell1and seals the fourth hole112. Therefore, the fourth membrane can block the fourth hole112, thereby separating the fourth cavity15from the inner cavity5of the shell1.

After long-term use of the battery, the gas produced in the battery will increase and accumulate. When the gas pressure reaches the first pressure, the third membrane breaks under the action of the first pressure. At this time, the third cavity14is in connection with the inner cavity5of the shell1through the third hole111, and the lithium-replenishing medium in the third cavity14flows into the inner cavity5of the shell1through the third hole111. In such a way, the replenishment of lithium ion content in the electrolyte can be realized.

Therefore, the lithium-replenishing media in both the first cavity21and the third cavity14can replenish lithium ions to the electrolyte in the shell1simultaneously from an inner direction and an outer direction, thereby ensuring balance of lithium ion distribution and improving the efficiency of lithium ion replenishment.

In addition, when the battery is out of thermal control or in a condition of rapid gas production due to abuse, the gas pressure in the shell1reaches the second pressure, and the fourth membrane breaks under the action of the second pressure. At this time, the fourth cavity15is in connection with the inner cavity5of the shell1through the fourth hole112, and the fire-fighting medium in the fourth cavity15flows into the shell1through the fourth hole112and plays a role in fire-fighting and extinguishing.

Therefore, the fire-fighting media in both the second cavity22and the fourth cavity15can release the fire-fighting media into the shell1from the inner direction and the outer direction, which can improve the fire-fighting and fire-extinguishing efficiency, provide double assurance and further ensure the safety of using the battery.

In some embodiments, the third cavity14corresponds to the second cavity22in the inner-outer direction of the shell1, and the fourth cavity15corresponds to the first cavity21in the inner-outer direction of the shell1. For example, as shown inFIG.2, the column2includes only one first cavity21and only one second cavity22, and the first cavity21is below the second cavity22. The shell1includes only one third cavity14and only one fourth cavity15. The third cavity14is above the fourth cavity15and at a peripheral side of the second cavity22. The fourth cavity15is at a peripheral side of the first cavity21.

In such a way, the lithium-replenishing and fire-fighting media in the column2and the lithium-replenishing and fire-fighting media in the shell1are arranged in a staggered manner in an axial direction of the battery, achieving a complementary effect on the inner and outer sides. The balance of lithium ion distribution after lithium replenishment and the balance of fire-fighting media distribution during fire extinguishing can be improved, and hence the lithium replenishment effect and the fire-fighting effect can be enhanced.

In some embodiments, the third cavity14is an annular cavity and surrounds the second cavity22. Therefore, the storage capacity of the lithium-replenishing medium can be increased, and it is also beneficial to realizing the lithium replenishment from the outside in a plurality of directions. At this time, it is necessary to arrange a plurality of third holes111spaced apart from each other along the peripheral direction, which can further improve the distribution balance of the lithium-replenishing medium and the lithium replenishment effect.

In some embodiments, the fourth cavity15is also an annular cavity and surrounds the first cavity21. Therefore, the storage capacity of the fire-fighting medium can be increased, and it is also beneficial to realizing replenishment of the fire-fighting medium from the outside in a plurality of directions. At this time, it is necessary to arrange a plurality of fourth holes112spaced apart from each other along the peripheral direction, which can further improve the distribution balance of the fire-fighting medium and the fire-fighting medium effect.

In some embodiments, there are a plurality of first cavities21and a plurality of second cavities22. The plurality of first cavities21and the plurality of second cavities22are alternately arranged one by one along the axial direction of the battery (i.e., an up-down direction inFIG.2). In such a way, the distribution balance of the lithium-replenishing medium and the fire-fighting medium flowing out of the column2can be further improved, and the lithium-replenishing efficiency and the fire-fighting efficiency can be further enhanced.

In other embodiments, there are a plurality of third cavities14and a plurality of fourth cavities15. The plurality of third cavities14and the plurality of fourth cavities15are alternately arranged one by one along the axial direction of the battery (i.e., the up-down direction inFIG.2). In such a way, the distribution balance of the lithium-replenishing medium and the fire-fighting medium flowing out of the shell1can be further improved, and the lithium-replenishing efficiency and the fire-fighting efficiency can be further enhanced.

In some embodiments, as shown inFIGS.1and2, the shell1has a split structure and includes an inner shell11and an outer shell12. The inner shell11and the outer shell12are both cylindrical, and the outer shell12surrounds the inner shell11. An inner space of the inner shell11forms the inner cavity5for storing the electrolyte, and the column2is also arranged in the inner shell11. The first hole211, the second hole221, the third membrane, and the fourth membrane are all arranged on the inner shell11. The third cavity14and the fourth cavity15are formed in an annular space between the inner shell11and the outer shell12. In such a way, the processing and production of the shell1can be facilitated, and the processing or arrangement of the first hole211, the second hole221, the third membrane, and the fourth membrane can be facilitated.

In some embodiments, the battery includes a first end cover3and a second end cover4. The inner shell11and the outer shell12are both connected between the first end cover3and the second end cover4. The column2has a first end abutting against or connected to the first end cover3, and a second end abutting against or connected to the second end cover4.

For example, as shown inFIGS.1and2, the first end cover3is mounted at a top of the shell1, and is a positive-pole end cover of the battery; and a positive-pole post is mounted in the first end cover3. The second end cover4is mounted at a bottom of the shell1and is a negative-pole end cover of the battery; and a negative-pole post is mounted in the second end cover4.

A top end of the inner shell11and a top end of the outer shell12are both connected and sealed with the first end cover3. A bottom end of the inner shell11and a bottom end of the outer shell12are both connected and sealed with the second end cover4. In such a way, the inner cavity5of the shell1can be sealed and blocked, realizing a requirement of filling the electrolyte.

A top end of the column2abuts against the first end cover3. For example, the first end cover3includes a slot, and the top end of the column2is inserted and fitted in the slot, so as to achieve a position limiting effect. Similarly, a bottom end of the column2abuts against the second end cover4. For example, the second end cover4also includes a slot, and the bottom end of the column2is inserted and fitted in the slot of the second end cover, so as to achieve a position limiting effect. Therefore, the structural stability of assembling the column2can be ensured.

Optionally, the column2is made of an insulation material, for example, plastic, which can provide insulation and protection.

In some embodiments, shapes of the first hole211and the second hole221are different. For example, the first hole211is a square hole while the second hole221is a circular hole. The first cavity21and the second cavity22can be distinguished by identifying different hole shapes, which facilitates the injection of the lithium-replenishing medium into the first cavity21and the injection of the fire-fighting medium into the second cavity22.

In some embodiments, shapes of the third hole111and the fourth hole112are different. For example, as shown inFIG.1, the third hole111is a rectangular hole, and as shown inFIG.2, the fourth hole112is a circular hole, so that the third cavity14and the fourth cavity15can be distinguished by identifying different hole shapes.

In some embodiments, as shown inFIG.2, the column2includes a first partition portion23that may be a baffle. The first partition portion23is fixed in the column2, and the first cavity21and the second cavity22are isolated by the first partition portion23.

In some embodiments, as shown inFIG.2, the shell1includes a second partition portion13that may be an annular baffle. The second partition portion13is fixed between the inner shell11and the outer shell12, and the third cavity14and the fourth cavity15are isolated by the second partition portion13.

In some embodiments, there are a plurality of first holes211in the cavity wall of the first cavity21, and the first membrane is wrapped on an outer peripheral side of the column2and blocks the plurality of first holes211. For example, as shown inFIG.2, the plurality of first holes211are arranged at equal intervals along an axial direction of the column2, and all the first holes211corresponding to the first cavity21can be sealed and blocked by a single first membrane. Therefore, during use, the outflow efficiency and distribution balance of the lithium-replenishing medium can be improved, and the lithium replenishment effect can be enhanced. In other embodiments, the plurality of first holes211corresponding to the first cavity21are arranged at equal intervals along the peripheral direction.

In some embodiments, there are a plurality of second holes221in the cavity wall of the second cavity22, and the second membrane is wrapped on an outer peripheral side of the column2and blocks the plurality of second holes221. For example, as shown inFIG.2, the plurality of second holes221are arranged at equal intervals along the axial direction of the column2, and all the second holes221corresponding to the second cavity22can be sealed and blocked by a single second membrane. Therefore, during use, the outflow efficiency and distribution balance of the fire-fighting medium can be improved, and the fire-fighting effect can be enhanced. In other embodiments, the plurality of second holes221corresponding to the second cavity22are arranged at equal intervals along the peripheral direction.

In some embodiments, the lithium-replenishing medium and the fire-fighting medium are liquid media, and the first membrane, the second membrane, the third membrane and the fourth membrane are elastic liquid-proof membranes, for example, waterproof and breathable membranes, which can effectively block the liquid media.

A battery pack according to embodiments of the present disclosure will be described below.

The battery pack according to embodiments of the present disclosure includes a plurality of batteries, at least part of which are the batteries described in any of the above embodiments. The plurality of batteries are connected in series or in parallel, to meet a requirement of large-capacity power supply.

Electric equipment according to embodiments of the present disclosure will be described below.

The electric equipment according to embodiments of the present disclosure can meet power supply needs by the battery or the battery pack in any of the above embodiments. When the battery is used, the electric equipment may be a clock, a remote controller and so on. When the battery pack is used, the electric equipment may be a new energy vehicle, an electric vehicle and the like. Power demands in different scenarios can be satisfied.

Embodiments of the present disclosure propose a battery, a battery pack, and electric equipment.

The battery according to embodiments of the present disclosure includes: a shell having an inner cavity; a wound core assembled in the inner cavity of the shell; a column supported in the wound core to prevent the wound core from collapsing, wherein the column includes a first cavity configured to store a lithium-replenishing medium and a second cavity configured to store a fire-fighting medium, a cavity wall of the first cavity having a first hole, and a cavity wall of the second cavity having a second hole; a first membrane configured to block the first hole, the first membrane being configured to break when subjected to a first pressure, allowing the lithium-replenishing medium in the first cavity to flow into the inner cavity through the first hole; and a second membrane configured to block the second hole, the second membrane being configured to break when subjected to a second pressure, allowing the fire-fighting medium in the second cavity to flow into the inner cavity through the second hole, wherein the second pressure is greater than the first pressure.

The battery according to the embodiments of the present disclosure can realize secondary lithium replenishment and address the problems of short battery life and serious attenuation, and has fire control and fire extinguishing functions when the battery is out of thermal control or in the condition of rapid gas production, thus ensuring the safety of using the battery.

In some embodiments, the battery includes a third membrane, and the shell includes a third cavity configured to store a lithium-replenishing medium; a cavity wall of the third cavity has a third hole, and the third membrane is configured to block the third hole; and the third membrane is configured to break when subjected to a third pressure, allowing the lithium-replenishing medium in the third cavity to flow into the inner cavity through the third hole, the third pressure being smaller than the second pressure.

In some embodiments, the battery includes a fourth membrane, and the shell includes a fourth cavity configured to store a fire-fighting medium; a cavity wall of the fourth cavity has a fourth hole, and the fourth membrane is configured to block the fourth hole; and the fourth membrane is configured to break when subjected to a fourth pressure, allowing the fire-fighting medium in the fourth cavity to flow into the inner cavity through the fourth hole, the fourth pressure being greater than the first pressure.

In some embodiments, the battery includes a third membrane and a fourth membrane, and the shell includes a third cavity configured to store a lithium-replenishing medium and a fourth cavity configured to store a fire-fighting medium; a cavity wall of the third cavity has a third hole, and a cavity wall of the fourth cavity has a fourth hole; the third membrane is configured to block the third hole, and the third membrane is configured to break when subjected to the first pressure, allowing the lithium-replenishing medium in the third cavity to flow into the inner cavity through the third hole; and the fourth membrane is configured to block the fourth hole, and the fourth membrane is configured to break when subjected to the second pressure, allowing the fire-fighting medium in the fourth cavity to flow into the inner cavity through the fourth hole.

In some embodiments, the third cavity corresponds to the second cavity and the fourth cavity corresponds to the first cavity in an inner-outer direction of the shell.

In some embodiments, the third cavity is an annular cavity and surrounds the second cavity; and/or the fourth cavity is an annular cavity and surrounds the first cavity.

In some embodiments, there are a plurality of first cavities and a plurality of second cavities, and the plurality of first cavities and the plurality of second cavities are alternately arranged one by one along an axial direction of the battery; and/or there are a plurality of third cavities and a plurality of fourth cavities, and the plurality of third cavities and the plurality of fourth cavities are alternately arranged one by one along the axial direction of the battery.

In some embodiments, the shell includes an inner shell and an outer shell surrounding the inner shell; the inner cavity is formed in the inner shell, and the first hole, the second hole, the third membrane, and the fourth membrane are arranged on the inner shell; and the third cavity and the fourth cavity are formed between the inner shell and the outer shell.

In some embodiments, the battery includes a first end cover and a second end cover; the inner shell and the outer shell are connected between the first end cover and the second end cover, and the column has a first end abutting against or connected to the first end cover and a second end abutting against or connected to the second end cover.

In some embodiments, shapes of the first hole and the second hole are different, and/or shapes of the third hole and the fourth hole are different.

In some embodiments, the column includes a first partition portion, and the first cavity and the second cavity are isolated by the first partition portion; and/or the shell includes a second partition portion, and the third cavity and the fourth cavity are isolated by the second partition portion.

In some embodiments, there are a plurality of first holes in the cavity wall of the first cavity, and the first membrane is wrapped on an outer peripheral side of the column and blocks the plurality of first holes; and/or there are a plurality of second holes in the cavity wall of the second cavity, and the second membrane is wrapped on an outer peripheral side of the column and blocks the plurality of second holes.

In some embodiments, the column is made of an insulation material.

In some embodiments, the lithium-replenishing medium includes at least one of lithium powder and a lithium salt solution; and/or the fire-fighting medium includes at least one of perfluorohexanone, alkyl phosphate and heptafluoropropane.

The battery pack according to embodiments of the present disclosure includes the battery as described in any of the above embodiments.

The electric equipment according to embodiments of the present disclosure includes the battery as described in any of the above embodiments or includes the battery pack as described in any of the above embodiments.

In the description of the present disclosure, it should be understood that terms such as “central,” “longitudinal,” “transverse,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” “anticlockwise,” “axial,” “radial” and “peripheral” are refer to the orientation or relative position as shown in the drawings. These relative terms are for convenience and simplification of description of the present disclosure and do not indicate or imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation. Hence, these relative terms shall not be construed to limit the present disclosure.

Although some embodiments have been shown and described above, it would be appreciated by those skilled in the art that the above embodiments are exemplary and cannot be construed to limit the present disclosure, and changes, modifications, alternatives, and variations can be made in the embodiments without departing from the scope of the present disclosure.