Battery and battery pack

Abstract

The present application relates to the technical field of batteries, and discloses a battery and a battery pack. The battery comprises: a case structure comprising a first side wall, a second side wall, a third side wall, a fourth side wall, a first blocking portion, and a second blocking portion; the length of the case structure is L, the thickness of the first side wall is I1, and the thickness of the second side wall is I2; the width of the case structure is T, the thickness of the third side wall is M1, and the thickness of the fourth side wall is M2; the height of the case structure is H, the thickness of the first blocking portion is a, and the thickness of the second blocking portion is b; and the capacity of the battery is C, and satisfies Formula (I), wherein 5 mm≤x≤8 mm, and 5 mm≤y≤10 mm. In the present application, the capacity of the battery is calculated on the basis of the structural size of the case structure, thereby simplifying battery capacity calculation, facilitating overall battery design, and improving design efficiency.

Description

Batteries and battery packs

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202510490530.7, filed on April 18, 2025, entitled "Battery and Battery Pack", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of battery technology, specifically to batteries and battery packs. Background Technology

[0004] With the increasing maturity of battery technology, batteries are widely used as power sources in electric vehicles. Battery capacity is one of the important performance indicators for measuring battery performance. The area of ​​the explosion-proof valve, the explosion threshold, and the current-carrying area of ​​the terminals are all closely related to the battery capacity. In current technology, the battery capacity needs to be calculated using a series of parameters and formulas, including the specific capacity of the material, compacted density, areal density, active material ratio, and electrode coating area. This calculation is difficult, inefficient, and detrimental to the overall battery design. Summary of the Invention

[0005] In view of this, this application provides a battery and a battery pack to solve the problems of high difficulty in calculating battery capacity, low efficiency, and unfavorable overall battery design in the prior art.

[0006] In a first aspect, this application provides a battery, comprising: a casing structure including a housing, wherein one end of the housing is open along the height direction; the housing includes a first sidewall and a second sidewall spaced apart along the length direction, a third sidewall and a fourth sidewall spaced apart along the width direction, and a second sealing portion spaced apart from the opening along the height direction; the casing structure further includes the first sealing portion, which is connected to the housing and seals the opening; along the length direction, the length of the casing structure is L, the thickness of the first sidewall is I1, and the thickness of the second sidewall is I2; along the width direction, the width of the casing structure is T, the thickness of the third sidewall is M1, and the thickness of the fourth sidewall is M2; along the height direction, the height of the casing structure is H, the thickness of the first sealing portion is a, and the thickness of the second sealing portion is b; the battery capacity is C, satisfying... Where 5mm≤x≤8mm, 5mm≤y≤10mm, L, I1, I2, T, M1, M2, H, a, and b are all in mm, and C is in Ah; when the battery is a lithium iron phosphate battery, it satisfies When the battery is a ternary lithium battery, it meets the following requirements: .

[0007] In one optional embodiment, the length L of the outer shell structure satisfies 50mm≤L≤500mm, the width T of the outer shell structure satisfies 10mm≤T≤100mm, and the height H of the outer shell structure satisfies 50mm≤H≤200mm.

[0008] In one optional embodiment, the thickness I1 of the first sidewall satisfies 0.3mm≤I1≤1.5mm, and the thickness I2 of the second sidewall satisfies 0.3mm≤I2≤1.5mm.

[0009] In one optional embodiment, the thickness M1 of the third sidewall satisfies 0.3mm≤M1≤1.5mm, and the thickness M2 of the fourth sidewall satisfies 0.3mm≤M2≤1.5mm.

[0010] In one optional embodiment, the thickness 'a' of the first sealing portion satisfies 2mm ≤ a ≤ 10mm.

[0011] In one optional embodiment, the thickness b of the second sealing portion satisfies 0.6mm ≤ b ≤ 4mm.

[0012] In one optional embodiment, the second sealing portion includes a bottom wall and a bottom support plate. The bottom wall is connected to the lower ends of the first side wall, the second side wall, the third side wall, and the fourth side wall. The bottom support plate is fitted onto the side of the bottom wall facing the first sealing portion.

[0013] In one alternative embodiment, along the height direction, the thickness of the bottom wall is J, and the thickness of the bottom support plate is d, satisfying b=J+d, 0.5mm≤J≤3mm, and 0.1mm≤d≤1mm.

[0014] In one optional embodiment, the first sealing portion includes a cover plate body and an insulating member. The cover plate body is simultaneously connected to the upper ends of the first side wall, the second side wall, the third side wall, and the fourth side wall. The insulating member is fitted onto the side of the cover plate body facing the second sealing portion.

[0015] Secondly, this application also provides a battery pack including the aforementioned battery.

[0016] The technical solution of this application has the following advantages:

[0017] The battery capacity can be calculated simply by examining the structural dimensions of the casing, eliminating the need for complex calculations using parameters such as areal density, specific capacity, and active material mass. This simplifies battery capacity calculation, making it more straightforward and easier to design the overall battery, thus improving design efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 is a schematic diagram of the overall structure of a battery according to an embodiment of this application;

[0020] Figure 2 is a schematic diagram of the exploded structure of the battery shown in Figure 1;

[0021] Figure 3 is a cross-sectional view of the housing along the length and height directions of an embodiment of this application;

[0022] Figure 4 is an enlarged view of point A in Figure 3;

[0023] Figure 5 is an enlarged view of point B in Figure 3;

[0024] Figure 6 is an enlarged view of point C in Figure 3;

[0025] Figure 7 is a cross-sectional view of the housing along the width and height directions of an embodiment of this application;

[0026] Figure 8 is an enlarged view of point E in Figure 7;

[0027] Figure 9 is an enlarged view of point F in Figure 7;

[0028] Figure 10 is a top view of the battery shown in Figure 1;

[0029] Figure 11 is a partial cross-sectional view in the GG direction of Figure 10 (the pole group is not shown).

[0030] Figure 12 is an enlarged view of point N in Figure 11;

[0031] Figure 13 is an enlarged view of point R in Figure 11;

[0032] Figure 14 is a schematic diagram of the structure of the first sealing part according to an embodiment of this application;

[0033] Figure 15 is an enlarged view of point D in Figure 3;

[0034] Figure 16 is a partial cross-sectional view along the KK direction in Figure 10 (the pole group is not shown).

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Outer shell structure; 11. First side wall; 12. Second side wall; 13. Third side wall; 14. Fourth side wall; 15. First sealing part; 151. Cover plate body; 152. Insulating component; 16. Second sealing part; 161. Bottom wall; 162. Bottom support plate; 17. Cover plate receiving section; 18. Electrode group receiving section; 2. Electrode group. Embodiments of the present invention

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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 some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0038] The embodiments of this application are described below with reference to Figures 1 to 16.

[0039] According to an embodiment of this application, in one aspect, a battery is provided, comprising: a casing structure 1, including a housing, with an opening at one end along the height direction; the housing includes a first sidewall 11 and a second sidewall 12 spaced apart along the length direction, a third sidewall 13 and a fourth sidewall 14 spaced apart along the width direction, and a second sealing portion 16 spaced apart from the opening along the height direction; the casing structure 1 further includes a first sealing portion 15, which is connected to the housing and seals the opening; along the length direction, the length of the casing structure 1 is L, the thickness of the first sidewall 11 is I1, and the thickness of the second sidewall 12 is I2; along the width direction, the width of the casing structure 1 is T, the thickness of the third sidewall 13 is M1, and the thickness of the fourth sidewall 14 is M2; along the height direction, the height of the casing structure 1 is H, the thickness of the first sealing portion 15 is a, and the thickness of the second sealing portion 16 is b; the battery capacity is C, satisfying... Where 5mm≤x≤8mm, 5mm≤y≤10mm, and the units of L, I1, I2, T, M1, M2, H, a, and b are all mm, and the unit of C is Ah; when the battery is a lithium iron phosphate battery, it satisfies When the battery is a ternary lithium battery, it meets the following requirements: .

[0040] The battery capacity can be calculated using the structural dimensions of the outer casing 1, without the need for complex calculations using parameters such as areal density, specific capacity, and active material mass. This simplifies the calculation of battery capacity, making it more straightforward and easier to design the overall battery, thus improving design efficiency.

[0041] It should be noted that, as shown in Figure 2, the battery also includes an electrode assembly 2, which is disposed within the outer casing structure 1. The electrode assembly 2 includes a positive electrode, a separator, and a negative electrode, which are stacked together. Typically, the area of ​​the negative electrode is larger than that of the positive electrode, and the area of ​​the separator is larger than that of the negative electrode.

[0042] It is worth noting that the battery capacity = coating areal density × active material ratio × active material specific capacity × electrode coating area; further, the battery capacity = positive electrode material length × positive electrode material height / 100 × areal density × active material content / 100 × 2 / 1000 × specific capacity × number of positive electrode layers / 1000, where the units for positive electrode material length and height are mm, and the unit for areal density is mg / cm³. 2 The unit of capacity is mAh / g.

[0043] Specifically, the length of the positive electrode material area can be calculated using the following formula: Length of positive electrode material area = Length of outer shell structure 1 - Thickness of first sidewall 11 - Thickness of second sidewall 12 - (Gap between electrode group 2 and shell + Length of separator and negative electrode overhang + Length of negative electrode and positive electrode overhang), that is, Length of positive electrode material area = L - I1 - I2 - x, where x is the calculated margin of the inner wall of outer shell structure 1 relative to the edge of the positive electrode material area along the length direction. It is worth noting that the gap between electrode group 2 and shell is the distance between the two edges of electrode group 2 along the length direction and the inner surfaces of the opposite first sidewall 11 and second sidewall 12; the length of separator and negative electrode overhang refers to the distance of the two sides of separator extending beyond the two sides of negative electrode along the length direction; the length of negative electrode and positive electrode overhang refers to the distance of the two sides of negative electrode extending beyond the two sides of positive electrode along the length direction.

[0044] Specifically, the height of the positive electrode material area can be calculated using the following formula: Height of the positive electrode material area = Height of the outer shell structure 1 - Thickness of the first sealing part 15 - Thickness of the second sealing part 16 - (Height of the separator and negative electrode overhang + Height of the negative electrode and positive electrode overhang), that is, Height of the positive electrode material area = Haby, where y is the calculated margin of the inner wall of the outer shell structure 1 relative to the edge of the positive electrode material area along the height direction. It is worth noting that the height of the separator and negative electrode overhang refers to the distance of the portion of the separator extending beyond the sides of the negative electrode along the height direction; the height of the negative electrode and positive electrode overhang refers to the distance of the portion of the negative electrode extending beyond the sides of the positive electrode along the height direction.

[0045] Specifically, the thickness space inside the housing cavity = T - M1 - M2. Considering the ease of inserting the bare cell (electrode group 2) into the housing before assembly and the expansion of electrode group 2 during charging and discharging, the assembly ratio is generally 88%-93% as an optional design. The number of positive electrode layers that can be accommodated in the thickness space inside the cavity is the key to calculating the cell capacity. Assuming that the number of positive electrode layers is n, then the number of negative electrode layers is n+1 and the number of separator layers is 2n+2. Therefore, the equation is satisfied: positive electrode thickness × n + negative electrode thickness × (n+1) + separator thickness × (2n+2) = (T - M1 - M2) × assembly ratio. By omitting the assembly ratio, we can approximate the following: positive electrode thickness × n + negative electrode thickness × (n+1) + separator thickness × (2n+2) = (T-M1-M2), and then derive the following: number of positive electrode layers n = (T-M1-M2-negative electrode thickness-2×separator thickness) / (positive electrode thickness + negative electrode thickness + 2×separator thickness).

[0046] The calculation logic for the positive electrode thickness is as follows: (area density / compacted density) × 2 × 10 + foil thickness. The negative electrode thickness is calculated similarly. Furthermore, the unit of area density is mg / cm³. 2 The positive electrode is typically 20 mg / cm³. 2 ~25mg / cm 2 The negative electrode is typically 9 mg / cm³. 2 ~12mg / cm 2 The unit for compacted density is g / cm³. 3 The positive electrode is typically 2.5 g / cm³. 3 ~2.8g / cm 3 The negative electrode is typically 1.5 g / cm³. 3 ~1.8g / cm 3 The thickness of the separator is generally 10μm to 12μm, the copper foil is generally 5μm to 7μm, and the aluminum foil is generally 12μm to 15μm. Additionally, the active material content is generally 95% to 98%. The specific capacity is measured in mAh / g; for ternary systems, it is generally 180 mAh / g to 210 mAh / g, and for lithium iron phosphate systems, it is generally 135 mAh / g to 155 mAh / g. Based on the above, we can deduce that 154μm ≤ positive electrode thickness ≤ 233μm, and 93.5μm ≤ negative electrode thickness ≤ 192μm.

[0047] In summary, based on the formula: Battery capacity = Positive electrode sheet length × Positive electrode sheet height / 100 × Areal density × Active material content / 100 × 2 / 1000 × Granular capacity × Number of positive electrode layers / 1000, we can deduce that: In the formula (T-M1-M2-negative electrode thickness-2×separator thickness), the thicknesses of the negative electrode and the separator are both in the micrometer range, and this part can be omitted for simplification; additionally, Record Calculations show that for a ternary system, the following conditions must be met. For lithium iron phosphate systems, it meets the requirements. The final formula is: .

[0048] It's worth noting that areal density is the mass per unit area of ​​a material with a specified thickness; that is, areal density = mass / area. Compacted density, in the context of lithium-ion battery design, refers to the ratio of the areal density of the electrode after compaction to its thickness (excluding the current collector thickness). Compacted density has a significant impact on battery performance; both excessively high and low compacted densities are detrimental to lithium-ion insertion and extraction. A suitable positive electrode compacted density can increase the battery's discharge capacity, reduce internal resistance, decrease polarization loss, extend cycle life, and improve the utilization rate of lithium-ion batteries.

[0049] It's worth noting that the components of a typical positive electrode coating material include active material, conductive agent, and binder. Reducing the proportion of conductive agent and binder increases the proportion of active material, thereby improving battery energy. In battery design, optimizing the conductive agent and binder is crucial; it's necessary to increase the proportion of active material without compromising the battery's power density, the electrode's liquid absorption capacity, or the electrode's flexibility.

[0050] It's worth noting that specific capacity refers to the ratio of the electrical capacity that the active materials inside a battery can release to the mass of those active materials. Specific capacity doesn't actually refer to the specific capacity of the "battery" itself, but rather to the specific capacity of the materials inside the battery (lithium iron phosphate, lithium cobalt oxide, lithium manganese oxide, lithium nickel oxide, etc.), and the specific capacity of each material is different.

[0051] In summary, the relationship between the battery capacity and the dimensions of the casing structure 1 can be derived. Therefore, the approximate battery capacity can be calculated based on the dimensions of the battery casing structure 1, and the calculation method is simple and clear; alternatively, the battery capacity can provide a reference for the design of battery structural components, especially some critical design parameters and dimensions.

[0052] The following examples illustrate batteries with different values ​​of x. The results of the embodiments and comparative examples are shown in Table 1. The embodiments refer to batteries that meet the range of x values ​​required by this embodiment, while the comparative examples refer to batteries that do not meet the range of x values ​​required by this embodiment.

[0053] Table 1. Battery results with different values ​​of x.

[0054]

[0055] The following examples illustrate batteries with different values ​​of y. The results of the embodiments and comparative examples are shown in Table 2. The embodiments refer to batteries that meet the range of y values ​​required by this embodiment, while the comparative examples refer to batteries that do not meet the range of y values ​​required by this embodiment.

[0056] Table 2. Battery results with different y values.

[0057]

[0058] In one embodiment, as shown in Figures 3 and 7, the length L of the outer shell structure 1 satisfies 50mm≤L≤500mm, the width T of the outer shell structure 1 satisfies 10mm≤T≤100mm, and the height H of the outer shell structure 1 satisfies 50mm≤H≤200mm.

[0059] Furthermore, the length L, width T, and height H of the outer shell structure 1 typically satisfy L > T and H > T. The relationship between L and H can be L > H, L = H, or L < H.

[0060] In one embodiment, as shown in Figures 4 and 5, the thickness I1 of the first sidewall 11 satisfies 0.3mm≤I1≤1.5mm, and the thickness I2 of the second sidewall 12 satisfies 0.3mm≤I2≤1.5mm.

[0061] It is worth noting that the thickness I1 of the first sidewall 11 is usually equal to the thickness I2 of the second sidewall 12, that is, I1=I2; of course, in some embodiments, I1 and I2 may not be equal.

[0062] In one embodiment, as shown in Figures 8 and 9, the thickness M1 of the third sidewall 13 satisfies 0.3mm≤M1≤1.5mm, and the thickness M2 of the fourth sidewall 14 satisfies 0.3mm≤M2≤1.5mm.

[0063] It is worth noting that the thickness M1 of the third sidewall 13 is usually equal to the thickness M2 of the fourth sidewall 14, that is, M1=M2; of course, in some embodiments, M1 and M2 may not be equal.

[0064] In one embodiment, as shown in Figures 12 and 13, the thickness a of the first sealing part 15 satisfies 2mm ≤ a ≤ 10mm, and the thickness b of the second sealing part 16 satisfies 0.6mm ≤ b ≤ 4mm.

[0065] Specifically, as shown in Figure 12, the first sealing part 15 includes a cover plate body 151 and an insulating member 152. The cover plate body 151 is connected to the upper ends of the first side wall 11, the second side wall 12, the third side wall 13 and the fourth side wall 14. The insulating member 152 is fitted onto the side of the cover plate body 151 facing the second sealing part 16.

[0066] Specifically, as shown in Figure 13, the second sealing part 16 includes a bottom wall 161 and a bottom support plate 162. The bottom wall 161 is connected to the lower ends of the first side wall 11, the second side wall 12, the third side wall 13, and the fourth side wall 14. The bottom support plate 162 is fitted onto the side of the bottom wall 161 facing the first sealing part 15. Furthermore, along the height direction, the thickness of the bottom wall 161 is J, and the thickness of the bottom support plate 162 is d, satisfying b=J+d, 0.5mm≤J≤3mm, and 0.1mm≤d≤1mm.

[0067] It is worth noting that, as shown in Figures 2, 3, and 7, the bottom wall 161 is integrally formed with the first side wall 11, the second side wall 12, the third side wall 13, and the fourth side wall 14 to form a shell with an opening at the top. The cover plate body 151 is welded to the upper ends of the first side wall 11, the second side wall 12, the third side wall 13, and the fourth side wall 14 to seal the opening. Furthermore, as shown in Figures 3 and 15, the inner surfaces of the first side wall 11 and the second side wall 12 are both formed with stepped structures, so that the inner surfaces of the first side wall 11 and the second side wall 12 both include a cover plate receiving section 17 and an electrode assembly receiving section 18. The cover plate receiving section 17 is used to enclose and form the aforementioned opening and is disposed above the electrode assembly receiving section 18. The thickness of the cover plate receiving section 17 is less than the thickness of the electrode assembly receiving section 18. The thickness of the electrode assembly receiving section 18 corresponding to the first side wall 11 is I1, and the thickness of the electrode assembly receiving section 18 corresponding to the second side wall 12 is I2. As shown in Figures 3 and 14, along the length direction, the distance between the cover plate receiving section 17 of the first sidewall 11 and the cover plate receiving section 17 of the second sidewall 12 is e, and the length of the cover plate body 151 is f, satisfying e = (f + 0.1) mm. That is, along the length direction, the cover plate body 151 is 0.05 mm smaller on each side than the opening size. As shown in Figures 7 and 14, along the width direction, the distance between the inner surface of the third sidewall 13 and the inner surface of the fourth sidewall 14 is p, and the width of the cover plate body 151 is q, satisfying p = q. That is, along the width direction, the width of the cover plate body 151 is the same as the width of the opening. This arrangement facilitates the assembly of the cover plate body 151 with the shell and laser welding.

[0068] It should be further explained that, since the first sidewall 11 and the second sidewall 12 need to form a stepped structure, the thickness of the first sidewall 11 and the second sidewall 12 is usually greater than the thickness of the third sidewall 13 and the fourth sidewall 14, that is, I1=I2>M1=M2. Since the bottom wall 161 needs to bear the weight of the pole group 2, J is usually made to be greater than I1=I2 and J>M1=M2. In summary, the thicknesses of the first sidewall 11, the second sidewall 12, the third sidewall 13, the fourth sidewall 14 and the bottom wall 161 usually satisfy J>I1=I2>M1=M2.

[0069] Taking a shell structure 1 as an example, where J=1mm, I1=I2=0.7mm, M1=M2=0.5mm, a=7.5mm, d=0.3mm; L=150mm, H=100mm, T=50mm. Calculations show that for lithium iron phosphate batteries, the battery capacity C ranges from 63Ah to 149Ah; for ternary lithium batteries, the battery capacity C ranges from 84Ah to 202Ah.

[0070] It is worth noting that the formula for calculating the battery capacity C provided in this application is to obtain the capacity range under the limit value. It can quickly determine the capacity range of the battery by the size of the structural components, providing a basis for the design of structural components such as battery overcurrent terminals and explosion-proof valves. In addition, the conventional method of calculating capacity based on parameters such as specific capacity, areal density, number of electrode layers, and active material content belongs to forward logic calculation. The battery capacity calculated by this conventional method must be included in the capacity range calculated by the formula in this application. However, this conventional method requires more parameters and is more complex to calculate. For non-battery design professionals, it is difficult to estimate the battery capacity.

[0071] According to an embodiment of this application, another aspect provides a battery pack including the battery described above.

[0072] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A battery, characterized in that, include: The outer shell structure includes a shell, wherein one end of the shell is open along the height direction, the shell includes a first sidewall and a second sidewall that are spaced apart from each other along the length direction, a third sidewall and a fourth sidewall that are spaced apart from each other along the width direction, and a second sealing part that is spaced apart from the opening along the height direction. The outer shell structure also includes a first sealing part that is connected to the shell and seals the opening. Along the length direction, the length of the outer shell structure is L, the thickness of the first sidewall is I1, and the thickness of the second sidewall is I2; Along the width direction, the width of the outer shell structure is T, the thickness of the third sidewall is M1, and the thickness of the fourth sidewall is M2; Along the height direction, the height of the outer shell structure is H, the thickness of the first sealing part is a, and the thickness of the second sealing part is b; The battery has a capacity of C, which satisfies... Where 5mm≤x≤8mm, 5mm≤y≤10mm, the units of L, I1, I2, T, M1, M2, H, a, and b are all mm, and the unit of C is Ah; When the battery is a lithium iron phosphate battery, it meets the following requirements: ； When the battery is a ternary lithium battery, it meets the following requirements: 。 2. The battery according to claim 1, characterized in that, The length L of the outer shell structure satisfies 50mm≤L≤500mm, the width T of the outer shell structure satisfies 10mm≤T≤100mm, and the height H of the outer shell structure satisfies 50mm≤H≤200mm.

3. The battery according to claim 1 or 2, characterized in that, The thickness I1 of the first sidewall satisfies 0.3mm≤I1≤1.5mm, and the thickness I2 of the second sidewall satisfies 0.3mm≤I2≤1.5mm.

4. The battery according to claim 1 or 2, characterized in that, The thickness M1 of the third sidewall satisfies 0.3mm≤M1≤1.5mm, and the thickness M2 of the fourth sidewall satisfies 0.3mm≤M2≤1.5mm.

5. The battery according to claim 1 or 2, characterized in that, The thickness 'a' of the first sealing part satisfies 2mm ≤ a ≤ 10mm.

6. The battery according to claim 1 or 2, characterized in that, The thickness b of the second sealing part satisfies 0.6mm≤b≤4mm.

7. The battery according to claim 1 or 2, characterized in that, The second sealing part includes a bottom wall and a bottom support plate. The bottom wall is connected to the lower ends of the first side wall, the second side wall, the third side wall and the fourth side wall. The bottom support plate is fitted onto the side of the bottom wall facing the first sealing part.

8. The battery according to claim 7, characterized in that, Along the height direction, the thickness of the bottom wall is J, and the thickness of the bottom support plate is d, satisfying b=J+d, 0.5mm≤J≤3mm, and 0.1mm≤d≤1mm.

9. The battery according to claim 1 or 2, characterized in that, The first sealing part includes a cover plate body and an insulating component. The cover plate body is connected to the upper ends of the first side wall, the second side wall, the third side wall and the fourth side wall. The insulating component is fitted onto the side of the cover plate body facing the second sealing part.

10. A battery pack, characterized in that, The battery includes any one of claims 1 to 9.

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