Battery structure and battery pack

Abstract

The utility model provides a battery structure and a battery pack, and relates to the field of batteries, the battery structure comprises a shell, a cover plate, a battery cell assembly, a buffer piece, a pressure relief piece and an insulating piece, the shell comprises an opening part, the cover plate is connected with the opening part to define a containing cavity, the battery cell assembly is arranged in the containing cavity, and the buffer piece is arranged in the containing cavity. The battery core assembly is arranged in the accommodating cavity, the buffer part is arranged in the accommodating cavity and sleeves the battery core assembly, the pressure relief part is arranged on the cover plate, the insulating part has a first preset melting point, the insulating part is arranged on one side, close to the battery core assembly, of the cover plate, and the insulating part is connected with the pressure relief part; and the pressure relief piece has a sealing state of abutting against the insulating piece and an exhaust state of being separated from the insulating piece. According to the invention, the pressure bearing capacity of the battery can be improved, the stability of the battery structure can be improved, the potential safety hazard caused by external impact of the battery can be reduced, and the safety performance when the battery fails can be improved.

Description

Technical Field

[0001] This application relates to the field of batteries, and in particular to a battery structure and a battery pack. Background Art

[0002] With the rapid development of the new energy industry, the demand for lithium-ion batteries and sodium-ion batteries is also increasing day by day. At the same time, higher requirements are put forward for the fast charging performance and cycle life of lithium-ion batteries and sodium-ion batteries.

[0003] In related technologies, most lithium-ion batteries and sodium-ion batteries are high-energy-density, high-capacity, and high-power products. When a short circuit occurs inside them, a large amount of energy will be released, and safety accidents are likely to occur. Summary of the Utility Model

[0004] To overcome the deficiencies in the prior art, this application provides a battery structure and a battery pack.

[0005] In a first aspect, a battery structure provided by this application includes: a housing, a cover plate, an electrode assembly, a buffer member, a pressure relief member, and an insulating member. The housing includes an open portion, and the cover plate is connected to the open portion to define a receiving cavity. The electrode assembly is disposed in the receiving cavity. The buffer member is disposed in the receiving cavity and sleeved on the electrode assembly. The pressure relief member is disposed on the cover plate. The insulating member has a first preset melting point and is disposed on a side of the cover plate close to the electrode assembly. The insulating member is connected to the pressure relief member, and the pressure relief member has a sealed state abutting against the insulating member and an exhaust state disengaging from the insulating member.

[0006] In combination with the first aspect, in a possible implementation manner, the shape of the electrode assembly is adapted to the shape of the receiving cavity, and the electrode assembly includes: a first electrode tab, a second electrode tab, and a separator. The second electrode tab is disposed opposite to the second electrode tab. The separator is disposed between the first electrode tab and the second electrode tab, and the separator connects the first electrode tab and the second electrode tab.

[0007] In combination with the first aspect, in a possible implementation manner, the first electrode tab includes: a first foil layer and a first electrode material layer. The first electrode material layer is disposed on two opposite sides of the first foil layer.

[0008] In combination with the first aspect, in a possible implementation manner, the length of the first foil layer along a first preset direction is equal to the length of the first electrode material layer along the first preset direction, the length of the first foil layer along a second preset direction is equal to the length of the first electrode material layer along the second preset direction, and the second preset direction is perpendicular to the first preset direction. The first foil layer is any one of a composite foil, a multi-alloyed foil, a porous foil, and a powder hot-pressed sintered foil.

[0009] In combination with the first aspect, in a possible implementation manner, the second electrode plate includes: a second foil layer and a second electrode material layer. The second electrode material layer is disposed on two opposite sides of the second foil layer, and the separator is located between the first electrode material layer and the second electrode material layer.

[0010] In combination with the first aspect, in a possible implementation manner, the separator includes: a base film layer and an adhesive layer. The base film layer has a first contact surface and a second contact surface that are oppositely arranged, and the adhesive layer is disposed on the first contact surface and the second contact surface.

[0011] In combination with the first aspect, in a possible implementation manner, the adhesive layer has a preset pattern, the adhesive layer has a second preset melting point, and the second preset melting point is greater than the first preset melting point.

[0012] In combination with the first aspect, in a possible implementation manner, the separator is stacked on the first electrode plate, the second electrode plate is stacked on the separator, the first electrode plate has a first end, and the first electrode plate, the separator, and the second electrode plate are wound around the first end into a column shape.

[0013] In combination with the first aspect, in a possible implementation manner, the battery structure further includes: an explosion-proof member. The explosion-proof member is disposed on the cover plate. The explosion-proof member has a preset bursting value, and the explosion-proof member is used to isolate or communicate the inside and outside of the accommodation cavity.

[0014] In a second aspect, a battery pack provided by the present application includes the above-mentioned battery structure.

[0015] Compared with the prior art, the beneficial effects of the present application:

[0016] The battery structure provided by this application has a cover plate connected to the open part of the housing to define an accommodation cavity. The battery cell assembly is arranged in the accommodation cavity, and a buffer sleeve is sleeved on the battery cell assembly to buffer the external impact force when the battery cell assembly is subjected to an external impact, protect the battery cell assembly, improve the impact resistance of the battery structure, and the outer shell can provide enclosure protection for the battery cell assembly, further improve the pressure-bearing capacity of the battery, enhance the stability of the battery structure, and reduce the safety hazards caused by external impact to the battery. In addition, a pressure relief member and an insulating member are both arranged on the cover plate, and the pressure relief member has a sealed state abutting against the insulating member and an exhaust state of disengaging from the insulating member. When heat and gas are generated in the accommodation cavity due to a fault in the battery cell assembly, causing the temperature and pressure in the accommodation cavity to rise, and when the temperature in the accommodation cavity reaches the first preset melting point, the insulating member is heated and melted, so that the pressure relief member disengages from the insulating member, and the inside and outside of the accommodation cavity are communicated to discharge the gas in the accommodation cavity to reduce the air pressure and can cool down the accommodation cavity, improving the safety performance of the battery during a fault. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of this application, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0018] Figure 1 Shows the overall schematic diagram of the battery structure;

[0019] Figure 2 Shows the exploded schematic diagram of the battery structure;

[0020] Figure 3 Shows the structural schematic diagram of the cover plate of the battery structure;

[0021] Figure 4 Shows the exploded schematic diagram of the battery cell assembly of the battery structure;

[0022] Figure 5 Shows the structural schematic diagram of the first foil layer in the second embodiment;

[0023] Figure 6 Shows the structural schematic diagram of the first foil layer in the third embodiment;

[0024] Figure 7 Shows the structural schematic diagram of the first foil layer in the fourth embodiment.

[0025] MAIN ELEMENT SYMBOL DESCRIPTION:

[0026] 100 - Housing; 110 - Open portion; 120 - Accommodating space; 200 - Cover plate; 300 - Battery cell assembly; 310 - First electrode tab; 311 - First foil layer; 312 - First electrode material layer; 320 - Second electrode tab; 321 - Second foil layer; 322 - Second electrode material layer; 330 - Separator; 331 - Base film layer; 332 - Adhesive layer; 400 - Buffer member; 500 - Pressure relief member; 600 - Insulating member; 700 - Explosion - proof member. Detailed implementation manners

[0027] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application and should not be construed as a limitation to the present application.

[0028] In the description of the present application, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0029] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0030] In the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0031] In this application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0032] Embodiment 1

[0033] Please refer to Figure 1 , an embodiment of the present application provides a battery structure. Please refer to Figure 2 and Figure 3 , the battery structure includes: a housing 100, a cover plate 200, a battery cell assembly 300, a buffer member 400, a pressure relief member 500 and an insulating member 600. The housing 100 includes an open portion 110. The cover plate 200 is connected to the open portion 110 to define a receiving cavity. The battery cell assembly 300 is disposed in the receiving cavity. The buffer member 400 is disposed in the receiving cavity, and the buffer member 400 is sleeved on the battery cell assembly 300. The pressure relief member 500 is disposed on the cover plate 200. The insulating member 600 has a first preset melting point. The insulating member 600 is disposed on a side of the cover plate 200 close to the battery cell assembly 300. The insulating member 600 is connected to the pressure relief member 500, and the pressure relief member 500 has a sealed state abutting against the insulating member 600 and an exhaust state of disengaging from the insulating member 600. The buffer member 400 is sleeved on the battery cell assembly 300 to buffer the external impact force when the battery cell assembly 300 is subjected to an external impact, protect the battery cell assembly 300, improve the impact resistance of the battery structure, and the outer shell can provide a surrounding protection for the battery cell assembly 300, further improve the pressure bearing capacity of the battery, improve the stability of the battery structure, and reduce the safety hazards of the battery caused by external impact. When the battery cell assembly 300 generates heat and gas due to a fault, causing the temperature and pressure in the receiving cavity to rise, and when the temperature in the receiving cavity reaches the first preset melting point, the insulating member 600 is heated and melted, so that the pressure relief member 500 disengages from the insulating member 600, and the inside and outside of the receiving cavity are communicated to discharge the gas in the receiving cavity to reduce the air pressure, and can cool the receiving cavity, improving the safety performance of the battery during a fault.

[0034] Please refer to Figure 1 and Figure 2, in some embodiments, the housing 100 is arranged along a first preset direction. The housing 100 is cylindrical and has an accommodation space 120. The open portion 110 has a first opening. The cover plate 200 is connected to the open portion 110 to cover the first opening, and the cover plate 200 and the housing 100 form a sealed accommodation cavity. The accommodation cavity is cylindrical.

[0035] In other embodiments, the housing 100 can also be prismatic.

[0036] In some embodiments, the housing 100 is sleeved on the battery cell assembly 300 to be able to enclose and protect the battery cell assembly 300. The housing 100 is made of hard steel. The high strength and high hardness properties of the hard steel material can improve the impact resistance of the battery cell assembly 300 and enhance the pressure-bearing performance of the battery.

[0037] In some embodiments, the buffer member 400 is cylindrical and has a second opening and a third opening. The orientation of the third opening is the same as that of the second opening, and the orientation of the second opening is the same as that of the first opening.

[0038] In some embodiments, the length of the buffer member 400 along the first preset direction is equal to the length of the battery cell assembly 300 along the first preset direction to be able to comprehensively enclose and protect the side surface of the battery cell assembly 300.

[0039] In some embodiments, the buffer member 400 is a phase change material with good toughness and insulation. When the housing 100 is punctured or impacted by a heavy object, the housing 100 will deform, and the burrs and sharp edges generated by the deformation of the housing 100 will penetrate into the interior of the battery cell assembly 300. On the one hand, it damages the structure of the battery cell assembly 300 and causes damage to the battery. On the other hand, the conductivity of the housing 100 will trigger a short circuit of the battery, causing the battery to generate a large amount of heat and easily leading to safety accidents. However, due to its good toughness and insulation, the buffer member 400 can, on the one hand, block the burrs and sharp edges generated by the housing 100 from penetrating into the interior of the battery cell assembly 300, protect the structure of the battery cell assembly 300, and effectively prevent the battery from short-circuiting. On the other hand, the buffer member 400 can absorb the heat of the battery cell assembly 300 and effectively improve the situation of over-high temperature of the battery cell assembly 300.

[0040] In some embodiments, a sticker is provided between the buffer member 400 and the battery cell assembly 300. The sticker is cylindrical and is sleeved on the battery cell assembly 300 to wrap the side surface of the battery cell assembly 300, and the length of the sticker along the first preset direction is equal to the length of the battery cell assembly 300 along the first preset direction.

[0041] Please refer to Figure 1 and Figure 2 , in some embodiments, the cover plate 200 is cylindrical. The length of the cover plate 200 along the second preset direction is equal to the length of the housing 100 along the second preset direction. The second preset direction is perpendicular to the first preset direction. The first preset direction is the vertical direction. The second preset direction is the horizontal direction.

[0042] In some embodiments, the pressure relief member 500 is sleeved in the cover plate 200 along the first preset direction, and the number of the pressure relief members 500 is two.

[0043] In other embodiments, the number of the pressure relief members 500 may also be three, four, five, six, etc., which will not be enumerated one by one here.

[0044] In some embodiments, the pressure relief member 500 is a pressure relief valve. When the pressure relief member 500 is in the sealed state, the pressure relief member 500 is closed so that the accommodation cavity is in a sealed state. When the pressure relief member 500 is in the exhaust state, the pressure relief valve is opened so that the inside and outside of the accommodation cavity are communicated, and the high-temperature gas in the accommodation cavity is discharged from the pressure relief valve.

[0045] In some embodiments, the insulating member 600 is an insulating ring with a low melting point. The number of the insulating members 600 is equal to the number of the pressure relief members 500. The insulating member 600 is used to fix the pressure relief member 500 so that the pressure relief member 500 is closed, the inside and outside of the accommodation cavity are isolated, and the accommodation cavity is in a sealed state. When the temperature in the accommodation cavity is higher than the first preset melting point, the insulating member 600 is heated and melted, so that the pressure relief member 500 is opened, the inside and outside of the accommodation cavity are communicated, and the high-temperature gas in the accommodation cavity is discharged from the pressure relief valve.

[0046] Please refer to Figure 2 and Figure 3 , in some embodiments, the battery structure further includes: an explosion-proof member 700. The explosion-proof member 700 is an explosion-proof valve. The explosion-proof member 700 is disposed on the cover plate 200. The explosion-proof member 700 has a preset bursting value, and the explosion-proof member 700 is used to isolate or communicate the inside and outside of the accommodation cavity.

[0047] In some embodiments, the number of the explosion-proof parts 700 is one. When the pressure or temperature in the accommodation cavity exceeds the preset blasting value, the explosion-proof part 700 will break from the notch to reduce the temperature and pressure in the accommodation cavity, thereby effectively avoiding the occurrence of explosion accidents.

[0048] Please refer to Figure 4 , in some embodiments, the shape of the battery cell assembly 300 is adapted to the shape of the accommodation cavity, and the battery cell assembly 300 includes: a first pole piece 310, a second pole piece 320, and a separator 330. The second pole piece 320 is disposed opposite to the second pole piece 320. The separator 330 is disposed between the first pole piece 310 and the second pole piece 320, and the separator 330 connects the first pole piece 310 and the second pole piece 320.

[0049] In some embodiments, the first pole piece 310 and the second pole piece 320 transmit electrons through the separator 330. The separator 330 is stacked on the first pole piece 310, and the second pole piece 320 is stacked on the separator 330. The first pole piece 310 has a first end. The second pole piece 320 has a second end. The second end and the first end are in corresponding positions. The first pole piece 310, the separator 330, and the second pole piece 320 are wound around the first end into a cylindrical shape.

[0050] Please refer to Figure 4 , in some embodiments, the first pole piece 310 is a positive electrode piece, and the first pole piece 310 includes: a first foil layer 311 and a first pole material layer 312. The first pole material layer 312 is disposed on two opposite sides of the first foil layer 311.

[0051] In some embodiments, the first pole material layer 312 is a positive electrode material layer, and the first pole material layer 312 is square.

[0052] In some embodiments, the first foil layer 311 is square, the length of the first foil layer 311 along the first preset direction is equal to the length of the first pole material layer 312 along the first preset direction, and the length of the first foil layer 311 along the second preset direction is equal to the length of the first pole material layer 312 along the second preset direction. The first foil layer 311 is a composite foil.

[0053] Please refer to Figure 4, in some embodiments, the second electrode tab 320 is a positive electrode tab, and the second electrode tab 320 includes: a second foil layer 321 and a second electrode material layer 322. The second electrode material layer 322 is disposed on two opposite sides of the second foil layer 321, and the separator 330 is located between the first electrode material layer 312 and the second electrode material layer 322.

[0054] In some embodiments, the second electrode material layer 322 is a negative electrode material layer, and the second electrode material layer 322 is square.

[0055] In some embodiments, the second foil layer 321 is square, the length of the second foil layer 321 along the first preset direction is equal to the length of the second electrode material layer 322 along the second preset direction, and the length of the second foil layer 321 along the second preset direction is equal to the length of the second electrode material layer 322 along the second preset direction. The second foil layer 321 is a composite foil.

[0056] In some embodiments, the first foil layer 311 is an aluminum composite foil. The first foil layer 311 is formed by plating aluminum on a PET layer using a water plating method to form a foil having an aluminum / PET / aluminum sandwich structure. The second foil layer 321 is a copper composite foil. The second foil layer 321 is formed by plating copper on a PET layer using a water plating method to form a foil having a copper / PET / copper sandwich structure. The PET in the middle is polyethylene terephthalate, which has good insulation, impact strength, acid and alkali corrosion resistance, and the heat distortion temperature can reach 225°C after being reinforced with glass fiber, and it has good heat aging resistance. The first foil layer 311 and the second foil layer 321 have high melting points, heat resistance, and insulation, so as to reduce the heat generation rate when the battery is short-circuited and can absorb a large amount of heat.

[0057] Please refer to Figure 4 , in some embodiments, the separator 330 includes: a base film layer 331 and an adhesive layer 332. The base film layer 331 has a first contact surface and a second contact surface which are oppositely arranged. The adhesive layer 332 is disposed on the first contact surface and the second contact surface, and the adhesive layer 332 has a preset pattern.

[0058] In some embodiments, the adhesive layer 332 can be composed of various shapes, such as square, rhombus, circle, etc., and will not be listed one by one here.

[0059] In some embodiments, the adhesive layer 332 has a second preset melting point, and the second preset melting point is greater than the first preset melting point.

[0060] In some embodiments, the adhesive layer 332 is a high-temperature resistant adhesive layer 332. When heat is generated in the battery due to needle puncture or heavy object impact, the adhesive layer 332 can support the base film layer 331, effectively preventing the base film layer 331 from shrinking due to excessive temperature, thereby effectively preventing the battery short circuit caused by the shrinkage of the base film layer 331 and improving the thermal runaway of the battery.

[0061] The positive electrode material is coated on both sides of the first foil layer 311, and the negative electrode material is coated on both sides of the second foil layer 321 to prepare the first electrode sheet 310 and the second electrode sheet 320. A high-temperature resistant adhesive is coated on the base film layer 331 to prepare the separator 330. The first electrode sheet 310, the separator 330, and the second electrode sheet 320 are stacked in sequence and then wound around the first end into a cylindrical shape to prepare the battery cell assembly 300. The adhesive tape is attached to the outside of the battery cell assembly 300 and then sleeved into the buffer member 400 and the housing 100 in sequence. The cover plate 200 covers the first open end, and the cover plate 200 is hermetically connected to the housing 100 to prepare the battery. When the battery is needle-punched or subjected to external heavy object impact, due to the good high-temperature resistance and insulation of the PET material layer, it can prevent a short circuit between the first electrode sheet 310 and the second electrode sheet 320. When the temperature of the battery cell assembly 300 rises, the high-temperature resistant adhesive layer 332 on the base film layer 331 prevents the base film layer 331 from shrinking due to heat. In addition, the buffer member 400 absorbs heat when the temperature of the battery cell assembly 300 rises and can prevent the burrs and sharp parts of the outer shell from piercing into the battery cell assembly 300, protecting the structure of the battery cell assembly 300.

[0062] Embodiment 2

[0063] This embodiment provides a battery structure. Compared with the above Embodiment 1, the difference is as follows:

[0064] Please refer to Figure 5 , in some embodiments, the first foil layer 311 is a multi-alloyed foil. The second foil layer 321 is a multi-alloyed foil.

[0065] In some embodiments, the first foil layer 311 is a high-ductility aluminum foil. By adding various alloying elements beneficial to improving the ductility of the aluminum foil into pure aluminum, the effect of improving the ductility of the aluminum foil is achieved. The second foil layer 321 is a high-ductility copper foil. When the battery is subjected to external object impact, the high ductility of the aluminum foil causes it to deform itself, attaching to the external object and the second electrode sheet 320, avoiding contact between the second electrode sheet 320 and the external object, and thus avoiding internal short circuit of the battery.

[0066] Example 3

[0067] This embodiment provides a battery structure. Compared with the above-mentioned Embodiment 1, the difference lies in that:

[0068] Please refer to Figure 6 , in some embodiments, the first foil layer 311 is a porous aluminum foil. The second foil layer 321 is a copper foil. The first foil layer 311 has a large number of micropores, which can increase the contact area between the first electrode material layer 312 and the first foil layer 311, reduce the interfacial contact resistance. When the first foil layer 311 is fractured due to an external object impact on the battery, the micropores can reduce the current-carrying area between the first electrode plate 310 and the external object, reduce the current passing through the external object, reduce the heat generated during internal short circuit, and thus reduce the heat shrinkage of the base film layer 331.

[0069] Example 4

[0070] This embodiment provides a battery structure. Compared with the above-mentioned Embodiment 1, the difference lies in that:

[0071] Please refer to Figure 7 , in some embodiments, the first foil layer 311 is a sintered multi-aluminum powder foil. The second foil layer 321 is a copper foil. The first foil layer 311 is formed by hot-pressing and sintering aluminum powder. There are a large number of voids inside the first foil layer 311, which is beneficial for the first electrode material layer 312 to be in closer contact with the first foil layer 311, reduce the interfacial impedance. And when the first foil layer 311 is fractured due to being punctured by a needle in the battery, the voids inside the first foil layer 311 can reduce the current passing through the needle, reduce the heat generated by internal short circuit, thus avoiding the shrinkage of the base film layer 331 due to high temperature and avoiding a greater degree of short circuit caused by the contact between the first electrode plate 310 and the second electrode plate 320.

[0072] Example 5

[0073] This application embodiment provides a battery pack (not shown in the figure), including the battery structure in any one of the above-mentioned Embodiment 1, Embodiment 2, Embodiment 3, and Embodiment 4. Therefore, it has all the beneficial effects of the battery structure in any one of the above-mentioned embodiments, and will not be elaborated one by one here.

[0074] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0075] Although the embodiments of this application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting this application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A battery structure, characterized in that: include: a housing, the housing comprising an open portion; A cover plate connected to the open portion to define a receiving cavity; A battery cell assembly, wherein the battery cell assembly is disposed in the accommodating cavity; A buffer member, the buffer member is disposed in the accommodating cavity, and the buffer member is sleeved on the battery core assembly; A pressure relief member, the pressure relief member being arranged on the cover plate; The insulating member has a first preset melting point, the insulating member is arranged on a side of the cover plate close to the battery cell assembly, the insulating member is connected to the pressure relief member, and the pressure relief member has a sealing state abutting against the insulating member and a venting state detached from the insulating member.

2. The battery structure according to claim 1, characterized in that: The shape of the battery cell assembly is adapted to the shape of the accommodating cavity, and the battery cell assembly comprises: First pole piece; a second pole piece, the second pole piece being arranged opposite to the second pole piece; A separator is disposed between the first pole piece and the second pole piece, and the separator connects the first pole piece and the second pole piece.

3. The battery structure according to claim 2, characterized in that: The first pole piece comprises: a first foil layer; The first pole material layer is disposed on two opposite sides of the first foil layer.

4. The battery structure according to claim 3, characterized in that: The length of the first foil layer along a first preset direction is equal to the length of the first pole material layer along the first preset direction, the length of the first foil layer along a second preset direction is equal to the length of the first pole material layer along the second preset direction, and the second preset direction is perpendicular to the first preset direction, and the first foil layer is any one of a composite foil, a multi-element alloy foil, a porous foil and a powder hot-pressed sintered foil.

5. The battery structure according to claim 3, characterized in that: The second pole piece comprises: a second foil layer; The second pole material layer is disposed on two opposite sides of the second foil layer, and the separator is located between the first pole material layer and the second pole material layer.

6. The battery structure according to claim 2, characterized in that: The separator comprises: A base film layer, the base film layer having a first contact surface and a second contact surface arranged opposite to each other; An adhesive layer is disposed on the first contact surface and the second contact surface.

7. The battery structure according to claim 6, characterized in that: The glue layer has a preset pattern, the glue layer has a second preset melting point, and the second preset melting point is greater than the first preset melting point.

8. The battery structure according to claim 2, characterized in that: The separator is stacked on the first pole piece, the second pole piece is stacked on the separator, the first pole piece has a first end, and the first pole piece, the separator and the second pole piece are wound around the first end into a column shape.

9. The battery structure according to any one of claims 1 to 8, characterized in that: The battery structure further comprises: An explosion-proof component is arranged on the cover plate, the explosion-proof component has a preset explosion value, and the explosion-proof component is used to isolate or connect the inside and outside of the accommodating cavity.

10. A battery pack, characterized in that: A battery structure comprising any one of claims 1 to 9.

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