A battery and a battery pack

Abstract

The application discloses a battery and a battery pack. The battery comprises a shell, a winding core, and a heat insulation layer. The shell comprises a top cover, and the top cover is provided with an explosion-proof valve. The winding core is arranged along a first direction relative to the top cover and has a first surface parallel to the first direction. The heat insulation layer is located on the first surface and comprises a first coating layer and a second coating layer. The first coating layer is located between the explosion-proof valve and the second coating layer. The explosion-proof valve has a central axis, and the explosion-proof valve is symmetrical about the central axis. The second coating layer is symmetrical about the central axis. A projection of the explosion-proof valve on the first surface is a first pattern, and the first pattern has a first size along a second direction. A projection of the second coating layer on the first surface is a second pattern, and the second pattern has a second size along the second direction. The first size is smaller than the second size. By means of the technical scheme, a large number of aluminum beads can be prevented from being generated by the aluminum foil in the winding core due to heat. The second coating layer can shield the aluminum beads, so that the aluminum beads are prevented from leaking to the outside through the explosion-proof valve, and the fire risk is reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery and a battery pack. Background Technology

[0002] In a wound-cell battery, the positive electrode (including aluminum foil and a positive electrode coating), the negative electrode (including copper foil and a negative electrode coating), and the separator are stacked in the order of "separator-negative electrode-separator-positive electrode" and then continuously wound (or stacked) to form a cylindrical or flat core. The core is then inserted into a casing, injected with electrolyte, and sealed to obtain the battery. When thermal runaway occurs, the internal temperature of the core rises rapidly. The aluminum foil heats up and turns into molten aluminum beads. These molten aluminum beads, along with the large amount of gas generated by the thermal runaway, leak from the explosion-proof valve in the casing. Because the area near the explosion-proof valve contains flammable gases and oxygen generated by the thermal runaway, the molten aluminum beads are easily ignited, causing a fire. Furthermore, the molten aluminum beads may also clog the explosion-proof valve, leading to a battery explosion.

[0003] In related technologies, a rectangular heat insulation layer is coated on the surface of the positive electrode sheet near the explosion-proof valve to insulate the aluminum foil. However, this method has poor heat insulation effect. Utility Model Content

[0004] This application provides a battery and battery pack that improves heat insulation and reduces the number of aluminum molten beads generated, thereby at least partially solving the above-mentioned technical problems.

[0005] To achieve the above objectives, according to a first aspect of this application, a battery is provided, comprising:

[0006] The housing includes a top cover, the top cover having an explosion-proof valve;

[0007] The core is arranged along a first direction relative to the top cover, and the core has a first surface parallel to the first direction;

[0008] A heat insulation layer is located on the first surface. The heat insulation layer includes a first coating layer and a second coating layer arranged along the first direction. The first coating layer is located between the explosion-proof valve and the second coating layer.

[0009] The explosion-proof valve has a central axis, and the explosion-proof valve is symmetrical about the central axis; the second coating layer is symmetrical about the central axis.

[0010] The projection pattern of the explosion-proof valve on the first surface is a first pattern, and the first pattern has a first dimension along the second direction; the projection pattern of the second coating layer on the first surface is a second pattern, and the second pattern has a second dimension along the second direction, the first dimension is smaller than the second dimension, the first dimension is the maximum distance from the first pattern to the central axis, and the second dimension is the maximum distance from the second pattern to the central axis; the second direction is perpendicular to the first direction and parallel to the first surface.

[0011] In some embodiments, the first coating layer has a third dimension along the second direction, and the second coating layer has a fourth dimension along the second direction, wherein the third dimension is larger than the fourth dimension.

[0012] In some embodiments, the projection pattern of the first coating layer on the first surface is rectangular; the first coating layer has a fifth dimension along the first direction;

[0013] The second shape is an arc; the arc has a sixth dimension along the first direction;

[0014] The ratio of the sixth dimension to the fifth dimension ranges from 0.5 to 3.5.

[0015] In some embodiments, the fifth dimension ranges from 1 mm to 2 mm.

[0016] In some embodiments, the sixth dimension ranges from 0.5 mm to 3.5 mm.

[0017] In some embodiments, the first graphic has a seventh dimension along the second direction;

[0018] The bow shape has a chord length h, where h = k × g, and the value of k ranges from 1.6 to 2.2.

[0019] In some embodiments, the second graphic is a rectangle; the ratio of the second size to the first size ranges from 1.5 to 3.

[0020] In some embodiments, the second graphic has a sixth dimension along the first direction;

[0021] The sixth dimension ranges from 0.5 mm to 3.5 mm.

[0022] In some embodiments, the housing further includes a shell that mates with the top cover;

[0023] The top cover and the shell together form a receiving cavity, and the core is located in the receiving cavity.

[0024] In some embodiments, the heat insulation layer is a ceramic heat insulation layer.

[0025] According to a second aspect of this application, a battery pack is provided, comprising the battery described in any of the above embodiments.

[0026] The technical solution of this application achieves the following technical effects: By setting a heat insulation layer near the explosion-proof valve, the temperature rise of the aluminum foil at this location can be slowed down, preventing the formation of a large number of molten aluminum beads after the aluminum foil heats up. This reduces the number of molten aluminum beads and prevents a large number of molten aluminum beads from clogging the explosion-proof valve and causing a battery explosion. Furthermore, the area of ​​the heat insulation layer near the explosion-proof valve is increased (i.e., a second coating layer is set). The second coating layer has a certain thickness and acts as a shield for the molten aluminum beads, preventing them from migrating towards the explosion-proof valve and leaking out to the outside of the casing through the explosion-proof valve. This prevents the molten aluminum beads from igniting flammable gases generated by thermal runaway after leakage, thus reducing the risk of battery fire.

[0027] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0030] Figure 1 This is a schematic diagram of a battery structure.

[0031] Figure 2 This is a 45° isometric view of the battery provided in an exemplary embodiment of this disclosure;

[0032] Figure 3 This is a schematic diagram of the structure of the explosion-proof valve and the heat insulation layer provided in the exemplary embodiments of this disclosure;

[0033] Figure 4 This is a front view structural diagram of a battery provided in an exemplary embodiment of this disclosure;

[0034] Figure 5 This is a schematic diagram of the structure of the explosion-proof valve and the heat insulation layer provided in the exemplary embodiments of this disclosure;

[0035] Figure 6 This is a schematic diagram of the structure of the explosion-proof valve and the heat insulation layer provided in the exemplary embodiments of this disclosure;

[0036] Figure 7 This is a 45° isometric view of the battery provided in an exemplary embodiment of this disclosure;

[0037] Figure 8 This is a front view structural diagram of a battery provided in an exemplary embodiment of this disclosure;

[0038] Figure 9 This is a top view of the battery structure provided in an exemplary embodiment of this disclosure.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1-Outer shell; 11-Top cover; 12-Explosion-proof valve; 13-Shell; 14-Positive electrode post; 15-Negative electrode post; 2-Core; 21-First surface; 3-Heat insulation layer; 31-First coating layer; 32-Second coating layer;

[0041] a - First dimension; b - Second dimension; c - Third dimension; d - Fourth dimension; e - Fifth dimension; f - Sixth dimension; g - Seventh dimension; h - Chord length; A - Central axis; X - First direction; Y - Second direction. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0043] See related technologies. Figure 1 As shown, a rectangular heat insulation layer 3 is provided on the surface of the positive electrode sheet of the core 2, near the explosion-proof valve 12, to insulate the aluminum foil. However, this method results in a small area covered by the heat insulation layer 3, poor heat insulation effect, and easy generation of a large number of molten aluminum beads. Furthermore, the size of the heat insulation layer 3 along the first direction X is small, making it difficult to prevent molten aluminum beads from entering the explosion-proof valve 12, thus posing a risk of molten aluminum beads clogging the explosion-proof valve 12.

[0044] In view of the technical problems of poor heat insulation effect and aluminum foil being easily heated into aluminum beads, which poses a safety hazard, this application proposes a battery and battery pack to overcome the above problems.

[0045] The following description, in conjunction with the accompanying drawings, describes a battery and battery pack provided in this application.

[0046] See Figure 2 As shown in the embodiment of this application, a battery is provided, comprising:

[0047] The outer casing 1 includes a top cover 11, the top cover 11 having an explosion-proof valve 12;

[0048] The core 2 is arranged relative to the top cover 11 along the first direction X, and the core 2 has a first surface 21 parallel to the first direction X;

[0049] The heat insulation layer 3 is located on the first surface 21. The heat insulation layer 3 includes a first coating layer 31 and a second coating layer 32 arranged along the first direction X. The first coating layer 31 is located between the explosion-proof valve 12 and the second coating layer 32.

[0050] The explosion-proof valve 12 has a central axis A, and the explosion-proof valve 12 is symmetrical about the central axis A. The second coating layer 32 is also symmetrical about the central axis A.

[0051] The projection pattern of the explosion-proof valve 12 on the first surface 21 is a first pattern, and the first pattern has a first dimension a along the second direction Y. Figure 1 (Not shown); the projection pattern of the second coating layer 32 on the first surface 21 is a second pattern, and the second pattern has a second dimension b along the second direction Y. Figure 1 (Not shown), the first dimension a is smaller than the second dimension b, the first dimension a is the maximum distance from the first pattern to the central axis A, and the second dimension b is the maximum distance from the second pattern to the central axis A; the second direction Y is perpendicular to the first direction X and parallel to the first surface 21.

[0052] For details, please refer to Figure 3 As shown, the projection pattern of the explosion-proof valve 12 on the first surface 21 is a first pattern, which has a first dimension a along the second direction Y. The projection pattern of the second coating layer 32 on the first surface 21 is a second pattern, which has a second dimension b along the second direction Y. The first dimension a is smaller than the second dimension b. The first dimension a is equal to the maximum distance of the explosion-proof valve 12 along the second direction Y to the central axis A. The second dimension b is equal to the maximum distance of the second coating layer 32 along the second direction Y to the central axis A.

[0053] In some embodiments, see Figure 4 and Figure 5 As shown, the first coating layer 31 has a third dimension c along the second direction Y, and the second coating layer 32 has a fourth dimension d along the second direction Y, wherein the third dimension c is greater than the fourth dimension d.

[0054] The first coating layer 31 is symmetrical about the central axis A of the explosion-proof valve 12, and the first surface 21 is symmetrical about the central axis A of the explosion-proof valve 12.

[0055] In some embodiments, the first surface 21 is perpendicular to the top cover 11.

[0056] In some embodiments, the central axis A is parallel to the first direction X.

[0057] In some embodiments, the first coating layer 31 and the top cover 11 abut against each other.

[0058] In some embodiments, the heat insulation layer 3 is disposed in the orthographic projection area of ​​the explosion-proof valve 12 and at one end of the first surface 21 near the explosion-proof valve 12. The orthographic projection area of ​​the explosion-proof valve 12 refers to "the cross-sectional area of ​​the core 2 obtained by projecting the explosion-proof valve 12 onto the core 2 along the first direction X".

[0059] In some embodiments, a flat core 2 is formed by repeatedly winding a positive electrode sheet (including aluminum foil and a positive electrode coating), a negative electrode sheet (including copper foil and a negative electrode coating), and a separator in the order of "separator-negative electrode-separator-positive electrode". Due to the multiple windings, the core 2 has multiple parallel first surfaces 21, each of which is provided with a heat insulation layer 3. The heat insulation layer 3 can be applied to the first surface 21 by coating. Coating reduces the thickness of the heat insulation layer 3, thereby helping to reduce the thickness of the core 2.

[0060] In some embodiments, the battery may include one winding core 2, or multiple winding cores 2 arranged in parallel and connected in series. The specific number of winding cores 2 can be determined according to the power supply requirements of the battery, and the embodiments of this application do not limit the number of winding cores 2.

[0061] In some embodiments, the explosion-proof valve 12 can connect the inside and outside of the housing 1 so that in the event of thermal runaway, the high-temperature gas inside the housing 1 can be discharged in a timely manner through the explosion-proof valve 12, thereby reducing the risk of battery explosion.

[0062] During thermal runaway, the area of ​​the explosion-proof valve 12 with the shortest pressure relief path and the first to come into contact with the high-temperature gas has a significantly higher temperature rise than the rest of the core 2. The aluminum foil in the area of ​​the explosion-proof valve 12 with the shortest pressure relief path melts first, easily forming a large number of aluminum beads.

[0063] Based on the above embodiments, by setting a heat insulation layer 3 in the projected area of ​​the explosion-proof valve 12, the heating of the aluminum foil in this area can be slowed down, preventing the formation of a large number of molten aluminum beads after the aluminum foil heats up. Therefore, the number of molten aluminum beads can be reduced, preventing a large number of molten aluminum beads from clogging the explosion-proof valve and causing the battery to explode. Furthermore, compared to related technologies, this embodiment increases the area of ​​the heat insulation layer 3 near the explosion-proof valve 12 (i.e., a second coating layer 32 is provided). The second coating layer 32 has a certain thickness, which acts as a shield for the molten aluminum beads, preventing them from migrating towards the explosion-proof valve 12 and leaking out to the outside of the outer casing 1 through the explosion-proof valve 12. This prevents the molten aluminum beads from igniting flammable gases generated by thermal runaway after leakage, reducing the risk of battery fire. Moreover, the battery modification cost of this embodiment is low; it only requires optimization based on existing coating machines and redesigning the shape of the heat insulation layer.

[0064] In some embodiments, the thickness of the heat insulation layer 3 ranges from 5 μm to 60 μm. The thickness direction of the heat insulation layer 3 is perpendicular to the first surface 21.

[0065] In some embodiments, the heat insulation layer 3 is a ceramic heat insulation layer. The ceramic heat insulation layer has high temperature resistance (typically able to withstand temperatures above 1000°C), and can form a non-flammable barrier in the event of battery thermal runaway, blocking and slowing down the heat transfer process on the aluminum foil. Furthermore, the ceramic heat insulation layer will not melt or release toxic gases when heated, significantly improving battery safety.

[0066] In some embodiments, the ceramic insulation layer can be coated onto the first surface 21 using a coating process. Specifically, ceramic powder is mixed with an organic solvent (such as ethanol or acetone) and a binder (such as polyvinylidene fluoride) in a certain proportion to form a uniform slurry. Ultrasonic cleaning is used to remove oil, dust, and other impurities from the first surface 21, ensuring that the first surface 21 is clean and smooth. The slurry is then uniformly coated onto the first surface 21 using a coating head of a coating machine. By adjusting the gap and coating speed of the coating head, the uniform thickness of the slurry is ensured. The coated core 2 is then dried using an oven or hot air dryer to form a solid ceramic insulation layer.

[0067] In some embodiments, see Figure 5 As shown, the first coating layer 31 has a rectangular projection on the first surface 21; the first coating layer 31 has a fifth dimension e along the first direction X; the second coating layer 32 has a second shape projected on the first surface 21, which is an arc shape; the arc shape has a sixth dimension f along the first direction X; the ratio of the sixth dimension f to the fifth dimension e ranges from 0.5 to 3.5. The sixth dimension f is equal to the dimension of the second coating layer 32 along the first direction X.

[0068] In some embodiments, see Figure 5 As shown, the value of the fifth dimension e ranges from 1 mm to 2 mm. If the fifth dimension e is less than 1 mm, the strength of the bow shape will decrease. If the fifth dimension e is greater than 2 mm, it will encroach too much on the space of the core 2, increasing the weight of the battery and affecting the battery energy density. If the fifth dimension e is greater than 2 mm, the area of ​​the heat insulation layer 3 will be too large, making it easy for microcracks to be generated on the heat insulation layer 3 when the battery expands or vibrates. These microcracks will spread rapidly along the heat insulation layer 3, leading to the breakage and failure of the heat insulation layer 3.

[0069] In some embodiments, see Figure 5As shown, the value of the sixth dimension f ranges from 0.5mm to 3.5mm. If the sixth dimension f is less than 0.5mm, the heat insulation and shielding effects will be insufficient. If the sixth dimension f is greater than 3.5mm, it will encroach too much on the space of the core 2, excessively increase the thickness of the core 2, and affect the energy density of the battery. If the sixth dimension f is greater than 3.5mm, the area of ​​the heat insulation layer 3 will be too large, and microcracks will easily be generated on the heat insulation layer 3 when the battery expands or vibrates. The microcracks will spread rapidly along the heat insulation layer 3, leading to the breakage and failure of the heat insulation layer 3.

[0070] In some embodiments, see Figure 5 As shown, the first shape has a seventh dimension g along the second direction Y, which is equal to the dimension of the explosion-proof valve 12 along the second direction Y; the arc shape has a chord length h, which satisfies the following formula: h = k × g, where k represents the proportionality coefficient, and the value of k ranges from 1.6 to 2.2. If the chord length h is too small, the shielding effect on the aluminum molten beads will be insufficient; if the chord length h is too large, it will increase the difficulty of the process, making it difficult to align the heat insulation layer 3 and the central axis A of the explosion-proof valve 12, which will reduce the product yield of the battery.

[0071] In some embodiments, see Figure 6 As shown, the projection pattern of the second coating layer 32 on the first surface 21 is a second shape, which is a rectangle; the ratio of the second dimension b to the first dimension a ranges from 1.5 to 3, that is, the range of b / a is from 1.5 to 3.

[0072] In some embodiments, see Figure 6 As shown, the second pattern has a sixth dimension f along the first direction X; the value of the sixth dimension f ranges from 0.5 mm to 3.5 mm. The sixth dimension f is equal to the dimension of the second coating layer 32 along the first direction X.

[0073] Based on the above embodiments, the second coating layer 32 can provide better heat insulation for the aluminum foil and better shielding for the aluminum molten beads, while avoiding the second coating layer 32 from being too large and encroaching on the space of the core 2, thus avoiding the reduction of the battery's energy density.

[0074] In some embodiments, see Figures 7 to 9 As shown, the outer casing 1 also includes a housing 13 that mates with the top cover 11; the top cover 11 and the housing 13 together form a receiving cavity, in which the winding core 2 is located. The housing 13 and the top cover 11 provide sealing and protection for the winding core 2. After the winding core 2 is encapsulated in the outer casing 1, an electrolyte can be injected into the receiving cavity to form a current path. The electrolyte (usually a lithium salt in an organic solvent) conducts lithium ions between the positive and negative electrodes, ensuring charge balance. Lithium ions in the electrolyte migrate back and forth between the positive and negative electrodes, maintaining the electrochemical reaction.

[0075] In some embodiments, see Figures 7 to 9As shown, the top cover 11 also includes a positive terminal 14 and a negative terminal 15. An explosion-proof valve 12 is disposed between the positive terminal 14 and the negative terminal 15. The winding core 2 includes a negative terminal tab and a positive terminal tab. The positive terminal tab and the positive terminal 14 are electrically connected, and the negative terminal tab and the negative terminal 15 of the winding core 2 are electrically connected.

[0076] In some embodiments, the positive electrode tab is a thin metal sheet extending from the edge of the positive electrode plate and directly soldered to the positive electrode coating. The negative electrode tab is a thin metal sheet extending from the edge of the negative electrode plate and directly soldered to the negative electrode coating. The positive electrode tab collects the current from the positive electrode plate and outputs it after forming a current path through the positive electrode post 14. The negative electrode tab collects the current from the negative electrode plate and serves as the input source after forming a current path through the negative electrode post 15.

[0077] In some embodiments, the positive electrode post 14 includes an aluminum electrode post or a nickel-plated copper electrode post, and the negative electrode post 15 includes a copper electrode post or a nickel-plated steel electrode post. The positive electrode post 14 and the negative electrode post 15 are used for electrical connection with other batteries.

[0078] According to a second aspect of this disclosure, a battery pack is provided, comprising the battery described in any of the foregoing embodiments. This battery pack possesses all the beneficial effects of the aforementioned battery, which will not be elaborated further herein.

[0079] Specifically, the battery pack may include one battery as described in the above embodiments, or it may include multiple batteries as described in the above embodiments, with the multiple batteries connected in series. This application does not limit the number of batteries.

[0080] This disclosure exemplarily describes the working process of a battery: When thermal runaway occurs in the battery core 2, the temperature of the aluminum foil in the core 2 continues to rise, and a large amount of high-temperature, flammable gas is generated inside the battery. The heating process of the aluminum foil covered by the heat insulation layer 3 is effectively suppressed, and it is not easy to turn into aluminum molten beads after being heated. However, the aluminum foil not covered by the heat insulation layer 3 heats up rapidly and forms a small number of aluminum molten beads. The small number of aluminum molten beads are pushed by the high-temperature, flammable gas and move towards the explosion-proof valve 12. They are blocked by the second coating layer 32 and will not enter the explosion-proof valve 12. Therefore, the explosion-proof valve 12 will not be blocked, reducing the risk of battery explosion and preventing the aluminum molten beads from igniting the flammable gas after leakage, thus reducing the risk of battery fire.

[0081] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0082] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0083] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0084] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A battery, characterized in that, include: The outer casing (1) includes a top cover (11) having an explosion-proof valve (12); The core (2) is arranged relative to the top cover (11) along a first direction (X), and the core (2) has a first surface (21) parallel to the first direction (X); A heat insulation layer (3) is located on the first surface (21). The heat insulation layer (3) includes a first coating layer (31) and a second coating layer (32) arranged along the first direction (X). The first coating layer (31) is located between the explosion-proof valve (12) and the second coating layer (32). The explosion-proof valve (12) has a central axis (A), the explosion-proof valve (12) is symmetrical about the central axis (A), and the second coating layer (32) is symmetrical about the central axis (A); The projection pattern of the explosion-proof valve (12) on the first surface (21) is a first pattern, and the first pattern has a first dimension (a) along the second direction (Y); the projection pattern of the second coating layer (32) on the first surface (21) is a second pattern, and the second pattern has a second dimension (b) along the second direction (Y). The first dimension (a) is smaller than the second dimension (b). The first dimension (a) is the maximum distance from the first pattern to the central axis (A), and the second dimension (b) is the maximum distance from the second pattern to the central axis (A); the second direction (Y) is perpendicular to the first direction (X) and parallel to the first surface (21).

2. The battery according to claim 1, characterized in that, The first coating layer (31) has a third dimension (c) along the second direction (Y), and the second coating layer (32) has a fourth dimension (d) along the second direction (Y), wherein the third dimension (c) is larger than the fourth dimension (d).

3. The battery according to claim 2, characterized in that, The projection pattern of the first coating layer (31) on the first surface (21) is rectangular; the first coating layer (31) has a fifth dimension (e) along the first direction (X); The second shape is an arc; the arc has a sixth dimension (f) along the first direction (X); The ratio of the sixth dimension (f) to the fifth dimension (e) ranges from 0.5 to 3.

5.

4. The battery according to claim 3, characterized in that, The value of the fifth dimension (e) ranges from 1 mm to 2 mm.

5. The battery according to claim 3, characterized in that, The sixth dimension (f) ranges from 0.5 mm to 3.5 mm.

6. The battery according to claim 3, characterized in that, The first pattern has a seventh dimension (g) along the second direction (Y); The bow shape has a chord length h, where h = k × g, and the value of k ranges from 1.6 to 2.

2.

7. The battery according to claim 2, characterized in that, The second shape is a rectangle; The ratio of the second dimension (b) to the first dimension (a) ranges from 1.5 to 3.

8. The battery according to claim 7, characterized in that, The second graphic has a sixth dimension (f) along the first direction (X); The sixth dimension (f) ranges from 0.5 mm to 3.5 mm.

9. The battery according to claim 1, characterized in that, The outer casing (1) further includes a housing (13) that cooperates with the top cover (11); The top cover (11) and the shell (13) enclose a receiving cavity, and the core (2) is located in the receiving cavity.

10. The battery according to claim 1, characterized in that, The heat insulation layer (3) is a ceramic heat insulation layer.

11. A battery pack, characterized in that, Includes the battery as described in any one of claims 1 to 10.

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