Battery, battery pack and electrical apparatus

Abstract

Disclosed in the present application are a battery, a battery pack and an electrical apparatus. The battery comprises: a housing, the housing comprising a bottom wall and a side wall, the side wall being provided with a transition section, the side wall being connected to the bottom wall by means of the transition section, and the bottom wall and the side wall jointly defining an accommodating chamber; an electrode assembly, the electrode assembly being provided in the accommodating chamber; an insulating member, the insulating member coating the electrode assembly; and a bottom support plate, the bottom support plate being provided between the bottom wall and the insulating member, wherein the minimum distance between the transition section and the bottom wall in the height direction x is r mm, the insulating member has a maximum thickness p mm in the height direction x, the bottom support plate has a maximum thickness f mm in the height direction x, and the battery satisfies: 0.05≤r / (p+f)≤5. The present application limits the minimum distance between the transition section and the bottom wall as well as the total thickness of the insulating member and the bottom support plate, so as to realize isolation of the electrode assembly and the housing, avoiding the problem of lithium plating caused by interference between the descending electrode assembly and the transition section in the housing, thus further preventing internal short circuits of the battery.

Description

Battery, battery pack and power-consuming device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on July 17, 2023, with application number 202310876078.9 and application name “A Battery, Battery Pack and Electrical Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The embodiments of the present application relate to, but are not limited to, the field of battery technology, and specifically to a battery, a battery pack, and an electrical device. Background Art

[0003] The bottom shell of the battery is generally made of metal. After the battery is filled with liquid and formed, if the electrode assembly contacts the bottom shell, it will cause an internal short circuit in the electrode assembly, and in severe cases, it will cause the battery to catch fire and explode. Therefore, an insulating film is often used to wrap the outside of the electrode assembly to prevent the electrode assembly from contacting the bottom shell. However, since there are rounded corners inside the bottom shell, the sinking of the electrode assembly will interfere with the rounded corners of the bottom shell, causing lithium deposition, which in turn affects battery performance. Technical issues

[0004] The present application provides a battery, a battery pack and an electrical device to solve the problem of internal short circuit in the battery caused by interference between the electrode assembly and the internal rounded corners of the bottom shell. Technical Solutions

[0005] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0006] In a first aspect, the present application provides a battery, comprising:

[0007] A housing, the housing comprising a bottom wall and side walls, the side wall being provided with a transition section, the side wall being connected to the bottom wall via the transition section, the bottom wall and the side walls together forming a receiving cavity;

[0008] an electrode assembly, the electrode assembly being disposed in the accommodating cavity;

[0009] an insulating member, the insulating member being coated on the electrode assembly;

[0010] a bottom supporting plate, the bottom supporting plate being arranged between the bottom wall and the insulating member, one side of the bottom supporting plate being connected to the bottom wall, and the side of the bottom supporting plate away from the bottom wall being connected to the insulating member;

[0011] The electrode assembly has a height direction x, the transition section has a minimum distance r mm from the bottom wall in the height direction x, the insulating member has a maximum thickness p mm in the height direction x, the bottom support plate has a maximum thickness f mm in the height direction x, and the battery satisfies:

[0012] 0.05≤r / (p+f)≤5.

[0013] Optionally, the battery further satisfies: 0.5≤r / (p+f)≤0.9.

[0014] Optionally, the battery further satisfies: 0.66≤r / (p+f)≤0.85.

[0015] Optionally, the Rockwell hardness of the insulating member is k1, the Rockwell hardness of the bottom support plate is k2, and the battery further satisfies: 6≤(k1+k2) / (p+f)≤1800.

[0016] Optionally, the accommodating cavity has a maximum height h mm in the height direction x, satisfying: 0.001≤(p+f) / h<0.1.

[0017] Optionally, the insulating member includes a first covering portion, a second covering portion and a third covering portion, and the first covering portion, the second covering portion and the third covering portion together form an insulating cavity, and the electrode assembly is at least partially accommodated in the insulating cavity; the electrode assembly includes two large surfaces, side surfaces connecting the two large surfaces and a bottom surface connecting the two large surfaces and the two side surfaces; the first covering portion is adhered to the bottom surface so that the first covering portion covers the bottom surface; the second covering portion is connected to the first covering portion and adheres to the two large surfaces so that the second covering portion covers the large surfaces; the third covering portion is connected to the second covering portion and adheres to at least part of the two side surfaces so that the third covering portion covers the side surfaces.

[0018] Optionally, the first covering portion is provided with a plurality of first through holes, the bottom support plate is provided with a plurality of second through holes, and the orthographic projections of the first through holes on the bottom wall along the height direction x do not coincide with the orthographic projections of the second through holes on the bottom wall along the height direction x.

[0019] Optionally, the battery further satisfies at least one of the following characteristics:

[0020] a) the insulating member and the bottom support plate are made of the same or different materials;

[0021] b) the diameter of the first through hole is n mm, and 0.5≤n≤10;

[0022] c) the diameter of the second through hole is e mm, and 0.5≤e≤10;

[0023] d) the tensile strength of the insulating member is 30 to 150 MPa, and the thermal deformation temperature of the insulating member is 30 to 150° C.;

[0024] e) The tensile strength of the bottom support plate is 30-150 MPa, and the thermal deformation temperature of the bottom support plate is 30-150°C.

[0025] Optionally, the battery further satisfies at least one of the following characteristics:

[0026] f)0.5≤r≤10;

[0027] g) 0.05≤p≤5;

[0028] h)0.05≤f≤5;

[0029] i)30≤k1≤90;

[0030] j)30≤k2≤90.

[0031] In a second aspect, the present application also provides a battery pack comprising the battery described above.

[0032] In a third aspect, the present application also provides an electrical device comprising the battery or the battery pack. Beneficial effects

[0033] Compared to the prior art, the battery of the present application includes: a shell, the shell including a bottom wall and side walls, the side walls being provided with a transition section, the side walls being connected to the bottom wall via the transition section, and the bottom wall and side walls together forming a receiving chamber; an electrode assembly, the electrode assembly being provided in the receiving chamber; an insulating member, the insulating member being coated on the electrode assembly; a bottom support plate, the bottom support plate being provided between the bottom wall and the insulating member, one side of the bottom support plate being connected to the bottom wall, and the side of the bottom support plate away from the bottom wall being connected to the insulating member; wherein the electrode assembly has a height direction x, the transition section has a minimum distance r mm from the bottom wall in the height direction x, the insulating member has a maximum thickness p mm in the height direction x, the bottom support plate has a maximum thickness f mm in the height direction x, and the battery satisfies: 0.05≤r / (p+f)≤5. By controlling the minimum distance between the transition section and the bottom wall on the shell and the total thickness of the insulating member and the bottom support plate, the present application can achieve isolation between the electrode assembly and the shell, avoid the problem of lithium deposition caused by the electrode assembly sinking and interfering with the transition section in the shell, and further prevent internal short circuits in the battery.

[0034] It can be understood that compared with the prior art, the battery pack and electrical device provided in the embodiments of the present application have all the technical features and beneficial effects of the above-mentioned batteries, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] FIG1 is an exploded schematic diagram of a battery structure provided in an embodiment of the present application;

[0036] FIG2 is a schematic cross-sectional view of a battery provided in an embodiment of the present application;

[0037] FIG3 is an enlarged schematic diagram of point A in FIG2 ;

[0038] FIG4 is a schematic diagram of the structure of the insulating member after unfolding according to an embodiment of the present application;

[0039] FIG5 is a schematic diagram of the structure after the insulating member and the electrode assembly are bonded together according to an embodiment of the present application;

[0040] FIG6 is a schematic diagram of the bottom support plate structure provided in an embodiment of the present application;

[0041] FIG7 is a schematic structural diagram of an electrode assembly provided in an embodiment of the present application;

[0042] Figure markings, 10-shell, 20-electrode assembly, 30-insulating part, 40-bottom support plate, 100-accommodating cavity, 101-bottom wall, 102-side wall, 103-transition section, 201-large surface, 202-side surface, 203-bottom surface, 300-insulating cavity, 301-first covering part, 302-second covering part, 303-third covering part, 3011-first through hole, 401-second through hole.

[0043] Implementation Methods of the Application

[0044] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. The described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0045] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application.

[0046] 1 , 2 and 3 , a battery is provided, comprising: a shell 10, the shell 10 comprising a bottom wall 101 and a side wall 102, the side wall 102 being provided with a transition section 103, the side wall 102 being connected to the bottom wall 101 via the transition section 103, the bottom wall 101 and the side wall 102 jointly forming a receiving chamber 100; an electrode assembly 20, the electrode assembly 20 being disposed in the receiving chamber 100; an insulating member 30, the insulating member 30 being coated on the electrode assembly 20; a bottom supporting plate 40, the bottom supporting plate 40 being disposed between the bottom wall 101 and the insulating member 30, one side of the bottom supporting plate 40 being connected to the bottom wall 101, and the side of the bottom supporting plate 40 away from the bottom wall 101 being connected to the insulating member 30; wherein the electrode assembly 20 has a height direction x, a minimum distance r mm between the transition section 103 and the bottom wall 101 in the height direction x, the insulating member 30 having a maximum thickness p mm in the height direction x, and the bottom supporting plate 40 having a maximum thickness f in the height direction x. mm, the battery satisfies: 0.05≤r / (p+f)≤5.

[0047] In some embodiments, by limiting the minimum distance between the transition section 103 and the bottom wall 101 in the height direction x, and the total thickness of the insulating member 30 and the bottom support plate 40 in the height direction x, isolation between the electrode assembly 20 and the shell 10 can be achieved, thereby avoiding the sinking of the electrode assembly 20 and interference with the transition section 103 to cause lithium plating, and further preventing internal short circuit of the battery, wherein the height direction x can refer to the direction indicated by the arrow in Figure 3; in addition, when the insulating member 30 meets a certain thickness, the insulating member 30 has a higher strength while ensuring insulation, and the high-strength insulating member 30 will not be damaged, thereby ensuring the insulation of the electrode assembly 20 and the safety of the battery; when the bottom support plate 40 meets a certain thickness requirement, the bottom support plate 40 contacts the bottom wall 101 of the shell 10, which can further ensure the reliability of the battery.

[0048] Optionally, the battery further satisfies: 0.5≤r / (p+f)≤0.9.

[0049] Optionally, the battery further satisfies: 0.66≤r / (p+f)≤0.85.

[0050] Furthermore, transition section 103 is located at the bottom corner of housing 10. While sidewalls 102 and bottom wall 101 are both flat-plate structures, transition section 103 is a curved transition structure between them. The inner surface of transition section 103 is not coplanar with the inner surface of sidewall 102; nor is the inner surface of transition section 103 coplanar with the inner surface of bottom wall 101. Specifically, transition section 103 is preferably a circular arc transition section. In FIG3 , the cross-section of transition section 103 is rounded. The provision of transition section 103 can prevent stress concentration at the bottom corner of housing 10, thereby improving the strength of the housing. When the transition section 103 is rounded, the minimum distance r mm between the transition section 103 and the bottom wall 101 in the height direction x can be regarded as the radius of the rounded corner; in addition, the minimum distance r mm between the transition section 103 and the bottom wall 101 in the height direction x, the maximum thickness p mm of the insulating member 30 in the height direction x, and the maximum thickness f mm of the bottom support plate 40 in the height direction x can all be directly measured using a caliper.

[0051] Optionally, the Rockwell hardness of the insulating member 30 is k1, and the Rockwell hardness of the bottom support plate 40 is k2, and the battery further satisfies: 6≤(k1+k2) / (p+f)≤1800. It can be understood that the Rockwell hardness indicates the ability of a material to locally resist a hard object from pressing into its surface, and reflects the surface strength of the material. By setting the Rockwell hardness and thickness of the insulating member 30 and the bottom support plate 40 to meet the above range, it can be ensured that the insulating member 30 and the bottom support plate 40 have a high surface strength to avoid damage to both due to external factors such as extrusion and friction; at the same time, the support capacity of the bottom support plate 40 for the electrode assembly 20 is improved, avoiding the sinking of the electrode assembly 20 due to insufficient support of the bottom support plate 40, and further avoiding lithium plating caused by contact with the shell 10 after the electrode assembly 20 sinks, thereby ensuring the capacity retention rate of the battery.

[0052] Optionally, the accommodating cavity 100 has a maximum height h mm in the height direction x, satisfying the following: 0.001 ≤ (p + f) / h < 0.1. It will be understood that (p + f) / h can be regarded as the ratio of the total thickness of the insulating member 30 and the bottom support plate 40 to the height of the accommodating cavity 100. The larger the ratio, the lower the energy density of the battery. When the above range is met, the capacity retention rate and energy density can be balanced, solving the energy density problem of the battery.

[0053] In some embodiments, referring to Figures 4, 5 and 7, the insulating member 30 includes a first covering portion 301, a second covering portion 302 and a third covering portion 303. The first covering portion 301, the second covering portion 302 and the third covering portion 303 together form an insulating cavity 300, and the electrode assembly 20 is at least partially accommodated in the insulating cavity 300; the electrode assembly 20 includes two large surfaces 201, a side surface 202 connecting the two large surfaces 201 and a bottom surface 203 connecting the two large surfaces 201 and the two side surfaces 202; the first covering portion 301 is adhered to the bottom surface 203 so that the first covering portion 301 covers the bottom surface 203; the second covering portion 302 is connected to the first covering portion 301 and adheres to the two large surfaces 201 so that the second covering portion 302 covers the large surfaces 201; the third covering portion 303 is connected to the second covering portion 302 and adheres to at least part of the two side surfaces 202 so that the third covering portion 303 covers the side surface 202.

[0054] Further, referring to Figure 4, the insulating part 30 includes a first covering portion 301, two second covering portions 302 and four third covering portions 303; wherein, the two second covering portions 302 are symmetrically arranged at the upper and lower ends of the first covering portion 301; two of the four third covering portions 303 are symmetrically arranged at the left and right ends of one second covering portion 302, and the other two third covering portions 303 are symmetrically arranged at the left and right ends of another second covering portion 302; the first covering portion 301, the second covering portion 302 and the third covering portion 303 are folded along their respective connections to form the structure of Figure 5, and the first covering portion 301, the second covering portion 302 and the third covering portion 303 enclose and form an insulating cavity 300. Since there are four third covering parts 303, during the actual folding process, there are actually two layers of third covering parts 303 on the side surface 202 of the electrode assembly 20. Each group of the two third covering parts 303 covers part of the side surface 202, and an overlapping area is further formed between the two to ensure that the side surface 202 can be completely covered by the third covering parts 303. Of course, in some other embodiments, only two groups of third covering parts 303 can be provided, and the two groups of third covering parts 303 are symmetrically distributed along the two ends of one of the second covering parts 302, and the two groups of third covering parts 303 can be folded to fit the entire surface on the side surface 202 to achieve complete coverage of the side surface 202. It can be understood that only when the bottom surface 203, the large surface 201 and the side surface 202 of the battery cell are completely covered by the insulating member 30 can the complete insulation between the electrode assembly 20 and the shell 10 be guaranteed.

[0055] Optionally, the insulating member 30 is made of a polymer material that is easy to fold. After the insulating member 30 is unfolded, the overall length ranges from 100 mm to 1200 mm, and the overall width ranges from 100 mm to 1200 mm. Further referring to Figure 5, which shows the shape of the insulating member 30 after folding, it can be seen that the folded insulating member 30 matches the shape of the electrode assembly 20, and the electrode assembly 20 can be accommodated in the insulating cavity 300 formed by folding. In the actual preparation process, the bottom support plate 40 can be located between the first covering portion 301 and the shell 10, with one side of the bottom support plate 40 connected to the first covering portion 301 and the other side abutting the shell 10.

[0056] Optionally, referring to Figures 4 and 7, the first covering portion 301 is provided with multiple first through holes 3011, and the bottom support plate 40 is provided with multiple second through holes 401, and the orthographic projection of the first through holes 3011 along the height direction x on the bottom wall 101 does not coincide with the orthographic projection of the second through holes 401 along the height direction x on the bottom wall 101.

[0057] The arrangement of the first through hole 3011 and the second through hole 401 increases the fluidity of the electrolyte. Specifically, a plurality of first through holes 3011 are arranged on the first covering portion 301, and the plurality of first through holes 3011 are arranged in an array along the first covering portion 301; a plurality of second through holes 401 are also arranged on the bottom support plate 40, and the plurality of second through holes 401 are arranged in an array along the bottom support plate 40; in order to ensure that the orthographic projections of the first through hole 3011 and the second through hole 401 on the housing 10 do not overlap, it is necessary to control the first through hole 3011. The first through holes 3011 and the second through holes 401 are staggered with each other; for example, the distance between adjacent first through holes 3011 can be from 1mm to 10mm, and the distance between adjacent second through holes 401 can be from 1mm to 10mm; by limiting the first through holes 3011 and the second through holes 401 to not overlap, it is possible to avoid the electrode pieces of the electrode assembly 20 from contacting the bottom shell 10 through the through holes, causing a short circuit between the electrode assembly 20 and the shell 10, while also ensuring that the electrode liquid passes through the through holes into the electrode assembly 20 to realize the charge and discharge functions of the battery.

[0058] Optionally, the insulating member 30 and the bottom support plate 40 may be made of the same or different materials. Preferably, the insulating member 30 and the bottom support plate 40 may be made of a non-conductive polymer material, such as PET or PP. Alternatively, the insulating member 30 and the bottom support plate 40 may be made of an inorganic non-metallic material, such as ceramic. Alternatively, the insulating member 30 and the bottom support plate 40 may be made of either a non-conductive polymer material or an inorganic non-metallic material. Both polymers and ceramics have insulating properties and can maintain a certain hardness to achieve the effect of increasing strength.

[0059] Optionally, in order to further prevent the coincidence of the first through hole 3011 and the second through hole 401, the first through hole 3011 and the second through hole 401 satisfy: 0.5 mm < n mm < 10 mm, 0.5 mm < e mm < 10 mm; where n represents the diameter of the first through hole 3011, and e represents the diameter of the second through hole 401. Preferably, the diameter of the second through hole 401 is smaller than the diameter of the first through hole 3011. Further, the first through hole 3011 and the second through hole 401 satisfy: 1 mm < n mm < 8 mm, 1 mm < e mm < 8 mm. Further still, the first through hole 3011 and the second through hole 401 satisfy: 2 mm < n mm < 5 mm, 2 mm < e mm < 5 mm.

[0060] Optionally, in order to further improve the tensile properties, electrolyte corrosion resistance and high temperature resistance of the insulating member 30 and the bottom support plate 40, it is necessary to satisfy: the tensile strength of the insulating member 30 ranges from 30 Mpa to 150 Mpa, optionally from 70 Mpa to 110 Mpa, and the heat distortion temperature of the insulating member 30 ranges from 30 °C to 150 °C, optionally from 60 °C to 90 °C; the tensile strength of the bottom support plate 40 ranges from 30 to 150 Mpa, optionally from 70 Mpa to 110 Mpa, and the heat distortion temperature of the bottom support plate 40 ranges from 30 °C to 150 °C, optionally from 60 °C to 90 °C.

[0061] In some embodiments, referring to FIG. 5, the bottom support plate 40 is rectangular as a whole, and there are rounded corners around the bottom support plate 40, and the radius of the rounded corners ranges from 0.5 mm to 10 mm.

[0062] In some embodiments, the minimum distance r mm between the transition section 103 and the bottom wall 101 in the height direction x satisfies: 0.5 ≤ r ≤ 10. For example, r can be any value or the range between any two values among 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 6, 7, 8, 9 and 10.

[0063] In some embodiments, the maximum thickness p mm of the insulating member 30 in the height direction x satisfies: 0.05 ≤ p ≤ 5. For example, p can be any value or the range between any two values among 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5 and 5.

[0064] In some embodiments, the maximum thickness f mm of the bottom support plate 40 in the height direction x satisfies: 0.05 ≤ f ≤ 5. For example, f can be any value or the range between any two values among 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5 and 5.

[0065] In some embodiments, the Rockwell hardness k1 of the insulating member 30 satisfies: 30≤k1≤90. For example, k1 may be any value among 30, 40, 50, 60, 70, 80, and 90, or a range between any two values.

[0066] In some embodiments, the Rockwell hardness k2 of the bottom supporting plate 40 satisfies: 30≤k2≤90. For example, k2 can be any value among 30, 40, 50, 60, 70, 80 and 90, or a range between any two values.

[0067] In some embodiments, the maximum height h mm of the accommodating cavity 100 in the height direction x can be designed as needed and is not further limited herein.

[0068] In some embodiments, the specific preparation process of the battery provided in this embodiment is as follows: first, before the electrode assembly 20 is put into the shell, the bottom support plate 40 is set on the bottom surface of the electrode assembly 20, and then the insulating part 30 is folded and wrapped on the electrode assembly 20 according to the corresponding relationship, and the various areas of the insulating part 30 are fixed to the surface of the electrode assembly 20 by hot melting, so that the insulating part 30 and the bottom support plate 40 can isolate the electrode assembly 20 and the inner wall of the shell 10 to prevent the electrode assembly 20 from short-circuiting. Since the insulating part 30 and the bottom support plate 40 have a certain thickness and hardness, they will not be damaged during the shelling process. At the same time, the problem of lithium plating caused by the sinking of the electrode assembly 20 and the interference with the transition section 103 in the shell is avoided, thereby preventing the internal short circuit of the battery and ensuring the safety of the battery.

[0069] In some implementations, this embodiment further provides a battery pack, and any battery in the battery pack can adopt the battery shown in Figure 1; in some embodiments, this embodiment further provides an electrical device, and the electrical device can adopt the secondary battery shown in Figure 1. The electrical device can include but is not limited to a backup power supply, a motor, an electric car, an electric motorcycle, a power-assisted bicycle, a bicycle, an electric tool, a large household battery, etc.

[0070] Further provided are Examples 1-28 and Comparative Examples 1-2, with the battery structures shown in Figure 1 . Examples 1-28 satisfy the range of 0.05 ≤ r / (p+f) ≤ 5, while Comparative Examples 1-2 do not. The batteries of Examples 1-28 and Comparative Examples 1-2 were tested for volumetric energy density utilization and capacity retention. The parameters and test results are shown in Tables 1 and 2, respectively.

[0071] The cycle performance test of the lithium-ion battery includes the following steps: charging and discharging the lithium-ion battery at 25°C. Specifically, charging at a constant current of 1C, standing for 10 minutes, discharging at a constant current of 1C, recording the first discharge capacity, cycling the battery 1000 times at 1C / 1C, recording the 1000th discharge capacity, and dividing the 1000th discharge capacity by the first discharge capacity to obtain the battery capacity retention rate after 1000 charge and discharge cycles.

[0072] Based on the internal volume space of the battery, battery capacity and platform voltage, the volume energy density is calculated, and then the battery volume energy density utilization rate is calculated.

[0073] Table 1

[0074] Table 2

[0075] As can be seen from Tables 1 and 2, compared to Comparative Examples 1 and 2, when Examples 1-28 meet the range of 0.05≤r / (p+f)≤5, the volume energy density utilization rate of the battery can be above 0.90, and the capacity retention rate of the battery can be between 92% and 99%. By limiting the minimum distance between the transition section 103 on the shell and the bottom wall 101, as well as the total thickness of the insulating member 30 and the bottom support plate 40, the electrode assembly 20 can be isolated from the shell 10, avoiding the problem of lithium deposition caused by the sinking of the electrode assembly 20 and the interference with the transition section 103 in the shell, and further preventing internal short circuits in the battery.

[0076] As can be seen from Examples 20-26, the lower the hardness of the insulating member 30 and the bottom support plate 40, the softer the texture, the lower the strength, and the more likely they are to be squeezed and damaged, causing a short circuit within the battery, which in turn leads to a decrease in the battery cell capacity retention rate; the higher the hardness of the two, the greater the brittleness, and the easier it is to be squeezed and damaged, causing a short circuit within the battery, which in turn leads to a decrease in the battery cell capacity retention rate. When the range of 6≤(k1+k2) / (p+f)≤1800 is met, the battery capacity retention rate is guaranteed.

[0077] The above is a detailed introduction to a welding positioning device and welding equipment provided by the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for those skilled in the art, based on the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A battery, wherein: include: A housing (10), the housing (10) comprising a bottom wall (101) and a side wall (102), the side wall (102) being provided with a transition section (103), the side wall (102) being connected to the bottom wall (101) via the transition section (103), the bottom wall (101) and the side wall (102) jointly forming a receiving cavity (100); An electrode assembly (20), the electrode assembly (20) being arranged in the accommodating cavity (100); An insulating member (30), the insulating member (30) being coated on the electrode assembly (20); a bottom supporting plate (40), the bottom supporting plate (40) being arranged between the bottom wall (101) and the insulating member (30), one side of the bottom supporting plate (40) being connected to the bottom wall (101), and a side of the bottom supporting plate (40) away from the bottom wall (101) being connected to the insulating member (30); The electrode assembly (20) has a height direction (x), the transition section (103) has a minimum distance r mm from the bottom wall in the height direction (x), the insulating member (30) has a maximum thickness p mm in the height direction (x), the bottom support plate (40) has a maximum thickness f mm in the height direction (x), and the battery satisfies: 0.05≤r / (p+f)≤5.

2. The battery according to claim 1, wherein The battery satisfies: 0.5≤r / (p+f)≤0.

9.

3. The battery according to claim 1, wherein The battery satisfies: 0.66≤r / (p+f)≤0.

85.

4. The battery according to claim 1, wherein The Rockwell hardness of the insulating member (30) is k1, the Rockwell hardness of the bottom support plate (40) is k2, and the battery further satisfies: 6≤(k1+k2) / (p+f)≤1800.

5. The battery according to claim 1, wherein The accommodating cavity (100) has a maximum height h mm in the height direction (x), satisfying: 0.001≤(p+f) / h<0.

1.

6. The battery according to claim 1, wherein The insulating member (30) comprises a first covering portion (301), a second covering portion (302) and a third covering portion (303); the first covering portion (301), the second covering portion (302) and the third covering portion (303) together form an insulating cavity (300); and the electrode assembly (20) is at least partially accommodated in the insulating cavity (300); The electrode assembly (20) comprises two large surfaces (201), side surfaces (202) connecting the two large surfaces (201), and a bottom surface (203) connecting the two large surfaces (201) and the two side surfaces (202); the first covering portion (301) is bonded to the bottom surface (203), so that the first covering portion (301) covers the bottom surface (203); the second covering portion (302) is connected to the first covering portion (301) and is bonded to the two large surfaces (201), so that the second covering portion (302) The third covering portion (303) is connected to the second covering portion (302) and is in contact with at least a portion of the two side surfaces (202), so that the third covering portion (303) covers the side surfaces (202).

7. The battery according to claim 6, wherein The first covering portion (301) is provided with a plurality of first through holes (3011), and the bottom supporting plate (40) is provided with a plurality of second through holes (401), and the orthographic projection of the first through holes (3011) on the bottom wall (101) along the height direction (x) does not overlap with the orthographic projection of the second through holes (401) on the bottom wall (101) along the height direction (x).

8. The battery according to claim 7, wherein The insulating member (30) and the bottom support plate (40) are made of the same material.

9. The battery according to claim 7, wherein: The insulating member (30) and the bottom support plate (40) are made of different materials.

10. The battery according to claim 7, wherein The diameter of the first through hole (3011) is n mm, and 0.5≤n≤10.

11. The battery according to claim 7, wherein The diameter of the second through hole (401) is e mm, and 0.5≤e≤10.

12. The battery according to claim 7, wherein: The tensile strength of the insulating member (30) ranges from 30 MPa to 150 MPa, and the thermal deformation temperature of the insulating member (30) ranges from 30° C. to 150° C.

13. The battery according to claim 7, wherein The tensile strength of the bottom support plate (40) ranges from 30 MPa to 150 MPa, and the thermal deformation temperature of the bottom support plate (40) ranges from 30° C. to 150° C.

14. The battery according to claim 5, wherein The battery further satisfies at least one of the following features: a)0.5≤r≤10； b) 0.05≤p≤5; c) 0.05≤f≤5; d)30≤k1≤90; e)30≤k2≤90.

15. A battery pack, wherein: A battery comprising the battery according to any one of claims 1 to 9.

16. An electrical device, wherein: A battery comprising any one of claims 1 to 14 or a battery pack comprising claim 15.

Images