Shell assembly of battery, battery and battery pack

Abstract

The present invention relates to the technical field of batteries, and discloses a battery shell assembly, a battery and a battery pack, the battery shell assembly comprises: a shell having a first surface and defining an accommodating space; the pole is arranged on the first surface; the insulating part is at least partially clamped between the shell and the pole; wherein the overlapping area of orthographic projections of the pole, the shell and the insulating part on the first surface is S, the thermogravimetric weight loss ratio of the insulating part at 460 DEG C is A, S / A is larger than or equal to 0.6 and smaller than or equal to 74, and the unit of S / A is mm < 2 > / %. By limiting the ratio of the thermogravimetric weight loss ratio A of the insulating part to the projected area S of the shell on the surface, far away from the accommodating space, of the pole, the insulating effect of the insulating part between the pole and the shell is ensured while the heat dissipation performance of the pole is ensured and safety risks such as thermal runaway of the battery are avoided, the pole is prevented from moving and misplacing, and the service life of the battery is prolonged. And the safety problems such as battery short circuit are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery shell assembly, a battery and a battery pack. Background Art

[0002] A battery typically includes an internal battery structure and an external battery structure. The external battery structure includes a housing that encloses a storage space, and the internal battery structure includes a battery cell that is disposed within the storage space. The external battery structure also includes a pole that is disposed within the housing. The pole lugs of the battery cell are electrically connected to the pole to draw out the power from the battery cell. In the prior art, an insulating member is typically disposed between the pole and the housing. However, the heat generated during the battery's charging and discharging process can easily cause the insulating member to melt due to the heat. Furthermore, under the extrusion force exerted by the pole and the housing, the molten insulating member can easily overflow, leading to insulation failure between the pole and the housing, and easily causing the pole to move and dislocate, which can easily lead to safety issues such as battery short circuits. Summary of the Invention

[0003] In view of this, the present invention provides a battery shell assembly, a battery and a battery pack to solve the problem in the prior art that the molten insulating parts are prone to overflow, which leads to insulation failure between the pole and the shell, and easily causes the pole to move and dislocate, which easily leads to safety problems such as battery short circuit.

[0004] In a first aspect, the present invention provides a battery housing assembly, comprising: a housing enclosing a housing space, the housing having a first surface; a pole disposed on the first surface; and an insulating member at least partially sandwiched between the housing and the pole; wherein the overlapping area of the orthographic projections of the pole, the housing, and the insulating member on the first surface is S, the thermal gravimetric weight loss rate of the insulating member at 460°C is A, satisfying 0.6≤S / A≤74, and the unit of S / A is mm 2 / %.

[0005] Beneficial effect: By limiting the ratio of the thermal weight loss rate A of the insulating part and the overlapping area S of the positive projection of the pole, the shell and the insulating part on the first surface, the heat dissipation performance of the pole is guaranteed, and the safety risks such as thermal runaway of the battery are avoided. At the same time, the insulation effect of the insulating part between the pole and the shell is guaranteed, the pole is avoided from moving and misaligning, and the occurrence of safety problems such as battery short circuit is avoided. Specifically, if S / A>74, when the shell covers the side of the pole away from the accommodation space, the covering area is too large, resulting in the area of the side of the pole away from the accommodation space that is not covered by the shell being too small, resulting in poor heat dissipation effect of the pole. In particular, when the battery is fast charged at a high rate, the heat generated by the pole is large, and the heat dissipation effect of the pole is poor, resulting in a higher risk of thermal runaway of the battery; or, the brittleness of the insulating part is too large, which easily leads to cracking of the insulating part, thereby causing insulation failure and causing safety risks such as battery short circuit. If S / A is less than 0.6, the insulating part will be subjected to excessive extrusion pressure from the outer shell and the pole, which may easily cause the insulating part to be squeezed out, and further cause a gap to appear between the outer shell and the pole, causing the insulating part and the pole to easily move and dislocate, which may easily cause insulation failure and battery short circuit problems; or, the insulating part may have poor thermosetting properties, and when the insulating part is subjected to high temperature, it may easily melt and overflow under the extrusion pressure of the outer shell and the pole, which may also cause a gap to appear between the outer shell and the pole, causing the insulating part and the pole to easily move and dislocate, which may easily cause insulation failure and battery short circuit problems; and, when the pole is pressed onto the first surface, the overall area of the pole will be smaller, and the heat dissipation effect of the pole will be poor. In particular, when the battery is fast charged at a high rate, the heat generated by the pole is large, and the heat dissipation effect of the pole is poor, resulting in a higher risk of thermal runaway of the battery.

[0006] In a second aspect, the present invention provides a battery, comprising: the above-mentioned battery shell assembly; a battery cell, arranged in the accommodating space, the battery cell comprising a battery cell body and a tab extending from the end of the battery cell body, the tab being electrically connected to the pole.

[0007] In a third aspect, the present invention provides a battery pack, comprising: the above-mentioned battery, wherein a plurality of the batteries are provided; and a bus bar welded to a side of the poles of at least two of the batteries away from the accommodating space. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0009] Figure 1 This is a schematic diagram of the overall structure of a battery according to an embodiment of the present invention;

[0010] Figure 2 for Figure 1 a top view of the battery shown;

[0011] Figure 3 for Figure 2 Cross-sectional view in the AA direction;

[0012] Figure 4 for Figure 3 A partial enlarged schematic diagram of B in the middle;

[0013] Figure 5 This is a schematic diagram of the overall structure of another battery according to an embodiment of the present invention;

[0014] Figure 6 for Figure 5 a top view of the battery shown;

[0015] Figure 7 for Figure 6 Cross-sectional view in CC direction;

[0016] Figure 8 for Figure 7 A partial enlarged schematic diagram of E in the middle;

[0017] Figure 9 for Figure 6 Cross-sectional view in the middle DD direction;

[0018] Figure 10 for Figure 9 A partial enlarged schematic diagram of F in the middle;

[0019] Figure 11 for Figure 5 Schematic diagram of the partially exploded structure of the battery;

[0020] Figure 12 This is a schematic diagram of the overall structure of another battery according to an embodiment of the present invention;

[0021] Figure 13 for Figure 12 a top view of the battery shown;

[0022] Figure 14 for Figure 13 Cross-sectional view in the GG direction;

[0023] Figure 15 for Figure 14 A partial enlarged schematic diagram of H in the middle;

[0024] Figure 16 This is a schematic structural diagram of a housing according to an embodiment of the present invention;

[0025] Figure 17 for Figure 4 The schematic diagram of the structure of the welding of the pole and the busbar is shown.

[0026] Description of reference numerals:

[0027] 1. Outer shell; 11. First surface; 12. Pole hole; 13. Main body; 14. Protrusion; 141. Connecting edge; 142. Folding edge; 15. Shell; 151. Cover mating part; 152. Cell mating part; 16. Cover; 2. Pole; 3. Insulator; 4. Cell; 5. Sealing ring; 6. Busbar; 7. Welding area. DETAILED DESCRIPTION

[0028] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0029] The following combination Figures 1 to 17 , describing embodiments of the present invention.

[0030] According to an embodiment of the present invention, on the one hand, a battery housing assembly is provided, comprising: a housing 1, enclosing a receiving space, the housing 1 having a first surface 11; a terminal 2, disposed on the first surface 11; and an insulating member 3, at least partially sandwiched between the housing 1 and the terminal 2; wherein the overlapping area of the orthographic projections of the terminal 2, the housing 1, and the insulating member 3 on the first surface 11 is S, and the thermal gravimetric weight loss rate of the insulating member 3 at 460°C is A, satisfying 0.6≤S / A≤74, where S / A is in mm. 2 / %.

[0031] In this embodiment, by limiting the thermal gravimetric weight loss rate A of the insulating member 3 and the ratio of the overlapping area S of the positive projections of the pole 2, the shell 1 and the insulating member 3 on the first surface 11, the heat dissipation performance of the pole 2 is ensured, and safety risks such as thermal runaway of the battery are avoided. At the same time, the insulation effect of the insulating member 3 between the pole 2 and the shell 1 is ensured, and the movement and dislocation of the pole 2 are avoided, and the occurrence of safety problems such as battery short circuit is avoided.

[0032] Specifically, if S / A>74, when the shell 1 covers the side of the pole 2 away from the accommodation space, the covered area is too large, resulting in the area of the pole 2 away from the accommodation space that is not covered by the shell 1 being too small, resulting in poor heat dissipation effect of the pole 2. In particular, when the battery is fast charged at a high rate, the heat generated by the pole 2 is large, and the heat dissipation effect of the pole 2 is poor, resulting in a higher risk of thermal runaway of the battery; or, the brittleness of the insulating component 3 is too large, which can easily cause the insulating component 3 to crack, thereby causing insulation failure and resulting in safety risks such as battery short circuit.

[0033] If S / A is less than 0.6, the insulating part 3 will be subjected to excessive extrusion pressure from the outer shell 1 and the pole 2, which may easily cause the insulating part 3 to be squeezed out, and further cause a gap to appear between the outer shell 1 and the pole 2, causing the insulating part 3 and the pole 2 to easily move and dislocate, which may easily cause insulation failure and battery short circuit problems; or, the insulating part 3 may have poor thermosetting properties, and when the insulating part 3 is subjected to high temperature, it may easily melt, and easily overflow under the extrusion pressure of the outer shell 1 and the pole 2, which may also cause a gap to appear between the outer shell 1 and the pole 2, causing the insulating part 3 and the pole 2 to easily move and dislocate, which may easily cause insulation failure and battery short circuit problems; and, when the pole is pressed onto the first surface, the overall area of the pole will be smaller, and the heat dissipation effect of the pole will be poor. In particular, when the battery is fast charged at a high rate, the heat generated by the pole is large, and the heat dissipation effect of the pole is poor, resulting in a higher risk of thermal runaway of the battery.

[0034] Optionally, the value of S / A is any value among 0.6, 0.8, 1, 1.2, 2, 2.8, 3, 5, 8, 10, 12, 15, 18, 20, 22, 24, 28, 30, 32, 35, 38, 40, 42, 45, 48, 50, 52, 55, 58, 60, 62, 65, 68, 70, 72, 74, or a value between any two values.

[0035] It is worth noting that in the related art, for high-rate fast-charging batteries, the overcurrent from the battery cell 4 to the pole 2 is large, which makes the heat generation of the pole 2 large, and easily causes the insulating member 3 disposed between the shell 1 and the pole 2 to melt due to heat; at the same time, the insulating member 3 will be subjected to the extrusion force exerted by the shell 1 and the pole 2, causing the molten insulating member 3 to be squeezed out, resulting in a gap between the shell 1 and the pole 2, and the insulating member 3 and the pole 2 are prone to movement and misalignment, thereby causing the insulation between the shell 1 and the pole 2 to fail, which easily leads to safety problems such as battery short circuit. In the present application, the thermal gravimetric weight loss rate A of the insulating member 3 and the overlapping area S of the positive projection of the pole 2, the shell 1 and the insulating member 3 on the first surface 11 have a suitable proportional relationship, which can not only meet the heat dissipation performance of the pole 2, but also ensure that the insulating member 3 is stably located between the shell 1 and the pole 2, avoiding the occurrence of problems such as insulation failure and battery short circuit, and improving the safety performance of the battery.

[0036] It should be noted that, in a direction perpendicular to the first surface 11 , the housing 1 , the pole 2 and the insulating member 3 all have projections on the first surface 11 , and the projections of the three overlap.

[0037] It should be noted that thermogravimetric analysis (TGA) is a technique widely used in fields such as materials science, chemistry, and environmental science. By measuring the change in mass of a substance with temperature or temperature variations, it can reveal its composition, structure, properties, and reaction processes. The weight loss rate is a key parameter in TGA, reflecting the volatilization loss of a substance at high temperatures and is crucial for understanding properties such as thermal stability and reactivity. Specifically, TGA measures the relationship between a substance's mass and temperature or temperature variations under programmed temperature control. TGA allows observation of the volatilization process—the loss of mass at high temperatures. This process can occur due to the weakening of intermolecular interactions caused by thermal motion of molecules, resulting in their detachment from the surface, or due to factors such as the breaking of chemical bonds, leading to decomposition. In TGA, the weight loss rate is the ratio of the mass lost at high temperatures to the original mass. The weight loss rate reflects a substance's tendency to volatilize at high temperatures and is an important indicator for evaluating a material's thermal stability and reactivity.

[0038] It is worth noting that, in this embodiment, a pole hole 12 is formed on the wall of the housing 1 where the first surface 11 is located, and the pole 2 is at least partially inserted into the pole hole 12 .

[0039] In one embodiment, the overlapping area S of the orthographic projections of the pole 2, the housing 1 and the insulating member 3 on the first surface 11 satisfies 10 mm 2 ≤S≤150mm 2Such a configuration ensures the heat dissipation performance of the pole 2 while preventing the insulating member 3 from being squeezed out, thereby ensuring the insulation effect of the insulating member 3 and avoiding the occurrence of safety problems such as battery short circuit.

[0040] It is worth noting that if S>150mm 2 When the outer shell 1 covers the side of the pole 2 away from the accommodation space, the covered area is too large, resulting in the area of the pole 2 away from the accommodation space that is not covered by the outer shell 1 being too small, resulting in poor heat dissipation effect of the pole 2. In particular, when the battery is fast charged at a high rate, the heat generated by the pole 2 is large, and the heat dissipation effect of the pole 2 is poor, resulting in a high risk of thermal runaway of the battery; and if it is to ensure that the pole 2 has sufficient heat dissipation area, it is necessary to increase the area of the side of the pole 2 away from the accommodation space, which will cause the overall volume of the pole 2 to increase, which will not only affect the space utilization rate and energy density of the battery, but also affect the arrangement of other components on the first surface 11 of the outer shell 1 (such as explosion-proof valves, injection holes, etc.). If S < 10mm 2 , which will cause the insulating part 3 to be subjected to excessive extrusion pressure exerted by the shell 1 and the pole 2, easily causing the insulating part 3 to be squeezed out, and then causing a gap between the shell 1 and the pole 2, causing the insulating part 3 and the pole 2 to easily move and misalign, easily causing insulation failure and battery short circuit problems; and, when the pole is pressed against the first surface, the overall area of the pole will be smaller, and the heat dissipation effect of the pole will be poor. In particular, when the battery is fast charged at a high rate, the heat generated by the pole is large, and the heat dissipation effect of the pole is poor, resulting in a higher risk of thermal runaway of the battery.

[0041] Optional, the value of S is 10mm 2 , 20mm 2 , 30mm 2 , 40mm 2 , 50mm 2 , 60mm 2 , 70mm 2 , 80mm 2 , 90mm 2 , 100mm 2 , 110mm 2 , 120mm 2 , 130mm 2 , 140mm 2 , 150mm 2 Any value in , or a value between any two values.

[0042] In one embodiment, the thermogravimetric weight loss rate A of the insulating member 3 at 460° C. satisfies 2% ≤ A ≤ 18%. This configuration ensures that the insulating member 3 has good heat resistance while preventing excessive brittleness of the insulating member 3 , thereby improving the reliability of the insulating member 3 , avoiding insulation failure, and enhancing the safety of the battery.

[0043] It is worth noting that if A>18%, the thermosetting property of the insulating part 3 will be poor. When the insulating part 3 is subjected to high temperature, it will easily melt and easily overflow under the extrusion pressure of the shell 1 and the pole 2, which will also cause a gap between the shell 1 and the pole 2, causing the insulating part 3 and the pole 2 to easily move and misalign, which may easily cause insulation failure and battery short circuit problems. If A<2%, the brittleness of the insulating part 3 will be too large, which may easily cause the insulating part 3 to crack, thereby causing insulation failure and causing safety risks such as battery short circuit.

[0044] Optionally, the value of A is any value among 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, or a value between any two values.

[0045] In one embodiment, Figure 3 and Figure 7 As shown, the housing 1 includes a shell 15 and a cover 16. The shell 15 has at least one opening. The cover 16 is connected to the shell 15 and blocks the opening. The shell 15 and the cover 16 enclose a storage space. Furthermore, the surface of the cover 16 or the surface of the shell 15 can serve as the first surface 11. That is, the pole can be provided on the cover 16 or the shell 15.

[0046] In a first embodiment, if Figure 4 、 Figure 8 and Figure 10 As shown, the housing 1 includes a main body 13 and a protrusion 14. The protrusion 14 is disposed on the first surface 11 and forms a flanged edge that snaps onto the side of the pole 2 away from the receiving space. The insulating member 3 is at least partially disposed between the side of the pole 2 away from the receiving space and the side of the protrusion 14 closer to the receiving space. Specifically, when the pole hole 12 is provided in the cover plate 16, the main body 13 is a plate body 13; when the pole hole 12 is provided in the shell 15, the main body 13 is a shell body 13.

[0047] Further, such as Figure 4 、 Figure 8 and Figure 10As shown, the protrusion 14 includes a connecting edge 141 and a folded edge 142. The side of the connecting edge 141 close to the accommodating space is fixedly connected to the main body 13, and the side of the connecting edge 141 away from the accommodating space is fixedly connected to the side of the folded edge 142. The folded edge 142 and the connecting edge 141 are arranged at a predetermined angle so that the folded edge 142 at least partially covers the side of the pole 2 away from the accommodating space.

[0048] It is worth noting that in this embodiment, the protrusion 14 has an annular structure. Specifically, the connecting edge 141 and the folded edge 142 both have annular structures and are continuously arranged along the circumference of the pole hole 12. It is understandable that the folded edge 142 is continuously arranged along the circumference of the side of the pole 2 away from the accommodation space. Therefore, in a direction perpendicular to the first surface 11, the projection of the folded edge 142 on the side of the pole 2 away from the accommodation space is annular, and the projected area is the annular area.

[0049] It should be further explained that the side of the pole 2 away from the accommodation space can be a circular surface or a square surface; accordingly, the projection of the folded edge 142 on the side of the pole 2 away from the accommodation space can be a circular ring or a square ring.

[0050] Of course, as an alternative embodiment, the side of the pole 2 away from the accommodation space can also have other regular or irregular shapes. Accordingly, the projection of the folded edge 142 on the side of the pole 2 away from the accommodation space can be adapted to the shape of the side of the pole 2 away from the accommodation space. In addition, the connecting edge 141 and / or the folded edge 142 can also be arranged discontinuously along the circumference of the pole hole 12, as long as they can cooperate with the pole 2 to provide a compressive force on the insulating member 3.

[0051] In one embodiment, Figure 4 、 Figure 8 and Figure 10 As shown, at least part of the insulating member 3 is located between the outer shell 1 and the circumference of the pole 2. Specifically, in one embodiment, as shown in FIG. Figure 4 As shown, the insulating member 3 is located between the protrusion 14 and the surface of the pole 2; in another embodiment, as shown in FIG. Figure 8 and Figure 10 As shown, the insulating member 3 is arranged to wrap the protrusion 14 , that is, the insulating member 3 is not only arranged between the protrusion 14 and the surface of the pole 2 , but also on the side of the protrusion 14 away from the pole 2 .

[0052] In one embodiment, see Figures 5 to 11, the protrusion 14 is welded to the main body 13, and 0.6≤S / A≤72 is satisfied. That is, the protrusion 14 and the main body 13 are separately provided, and the protrusion 14 is fixedly connected to the main body 13 by welding. At this time, the connection strength between the protrusion 14 and the main body 13 is relatively weak, and the extrusion force exerted by the protrusion 14 and the pole 2 on the insulating part 3 is relatively small, making it less likely for the insulating part 3 to be squeezed out. Therefore, when the thermal weight loss rate of the insulating part 3 is constant, the area of the side of the outer shell 1 covering the pole 2 away from the accommodating space can be relatively reduced. At this time, it can not only ensure that the insulating part 3 is stably located between the outer shell 1 and the pole 2, thereby ensuring the insulation effect of the insulating part 3 and avoiding the occurrence of safety problems such as battery short circuit, but also further increase the area of the uncovered part of the pole 2, improve the heat dissipation effect of the pole 2, reduce the risk of thermal runaway of the battery, and improve the safety performance of the battery. Alternatively, when the area of the side of the pole 2 away from the accommodation space covered by the shell 1 is constant, the thermal weight loss rate of the insulating part 3 can be relatively increased. While preventing the insulating part 3 from cracking, the insulating part 3 will not be squeezed out because the extrusion force it receives is relatively small.

[0053] In one embodiment, see Figures 1 to 4 , the protrusion 14 is integrally provided with the main body 13, satisfying 0.8≤S / A≤74. For example, the main body 13 and the protrusion 14 are integrally formed by stamping. At this time, the connection strength between the protrusion 14 and the main body 13 is relatively high, and the extrusion force exerted by the protrusion 14 and the pole 2 on the insulating part 3 is relatively large, making it relatively easier for the insulating part 3 to be squeezed out and cause insulation failure and battery short circuit. Therefore, when the thermal weight loss rate of the insulating part 3 is constant, the area of the side of the outer shell 1 covering the pole 2 away from the accommodation space can be relatively increased, thereby reducing the pressure on the insulating part 3, avoiding the insulating part 3 from being squeezed out, ensuring the insulation effect of the insulating part 3 and avoiding the occurrence of safety problems such as battery short circuit. Alternatively, when the area of the side of the outer shell 1 covering the pole 2 away from the accommodation space is constant, the thermal weight loss rate of the insulating part 3 can be relatively reduced, so that the insulating part 3 can have better thermosetting properties when heated, avoiding the insulating part 3 from melting and being squeezed out.

[0054] In one embodiment, the protrusion 14 is made of steel and satisfies 0.8≤S / A≤74. It is worth noting that the steel protrusion 14 is relatively strong, and the extrusion force exerted by the protrusion 14 and the pole 2 on the insulating part 3 is relatively large, making the insulating part 3 relatively easier to be squeezed out and causing insulation failure and battery short circuit. Therefore, when the thermal weight loss rate of the insulating part 3 is constant, the area of the shell 1 covering the side of the pole 2 away from the accommodation space can be relatively increased, thereby reducing the pressure on the insulating part 3, avoiding the insulating part 3 from being squeezed out, ensuring the insulation effect of the insulating part 3 and avoiding the occurrence of safety problems such as battery short circuit. Alternatively, when the area of the shell 1 covering the side of the pole 2 away from the accommodation space is constant, the thermal weight loss rate of the insulating part 3 can be relatively reduced, so that the insulating part 3 can have better thermosetting properties when heated, avoiding the insulating part 3 from melting and being squeezed out.

[0055] In another embodiment, the protrusion 14 is made of aluminum and satisfies the condition 0.6 ≤ S / A ≤ 72. It is worth noting that the aluminum protrusion 14 is relatively weak, and the compressive force exerted on the insulating member 3 by the protrusion 14 and the terminal 2 is relatively small, making the insulating member 3 less likely to be extruded. Therefore, when the thermal weight loss rate of the insulating member 3 is constant, the area of the outer shell 1 covering the side of the terminal 2 away from the accommodation space can be relatively reduced. In this case, not only can the insulating member 3 be stably positioned between the outer shell 1 and the terminal 2, thereby ensuring the insulating effect of the insulating member 3 and preventing safety issues such as battery short circuits, but it can also further increase the area of the uncovered portion of the terminal 2, improve the heat dissipation effect of the terminal 2, reduce the risk of thermal runaway of the battery, and improve the safety performance of the battery. Alternatively, when the area of the outer shell 1 covering the side of the terminal 2 away from the accommodation space is constant, the thermal weight loss rate of the insulating member 3 can be relatively increased. While preventing the insulating member 3 from cracking, the relatively small compressive force prevents the insulating member 3 from being extruded.

[0056] In a second embodiment, if Figures 12 to 15 As shown, the pole 2 is at least partially pressed onto the first surface 11, and the insulating member 3 is at least partially disposed between the first surface 11 and a side of the pole 2 adjacent to the receiving space. In other words, the pole 2 is connected to the housing 1 by riveting, resulting in a simpler structure and lower process costs.

[0057] In one embodiment, the insulating member 3 is made of thermosetting material. Furthermore, the overlapping area S of the orthographic projections of the pole 2, the housing 1, and the insulating member 3 on the first surface 11 and the thermogravimetric weight loss rate A of the insulating member 3 at 460°C satisfy 0.6≤S / A≤70.

[0058] It is worth noting that thermosetting materials are not easy to melt when exposed to high temperatures, which can reduce the impact on the insulating part 3 in a high-temperature environment. Therefore, under the influence of the heat generated during the overcurrent and heat abortion process of the pole 2, the insulating part 3 can be prevented from melting, thereby ensuring the insulation effect of the insulating part 3 and the safety performance of the battery. At this time, even if the overlapping area between the shell 1 and the pole 2 and the insulating part is relatively small, so that the extrusion force on the insulating part 3 is relatively large, it will not cause the insulating part 3 to be squeezed out. At the same time, it can further increase the heat dissipation area of the pole 2, improve the heat dissipation effect of the pole 2, reduce the risk of thermal runaway of the battery, and improve the safety performance of the battery.

[0059] It's worth noting that thermosetting materials, such as thermosetting plastics, are primarily composed of thermosetting resins, combined with various necessary additives, and then crosslinked to form the final product. They are liquid during the initial manufacturing or molding process. Once solidified, they become insoluble, infusible, and incapable of remelting or softening. Thermosetting plastics soften and flow upon initial heating. Upon reaching a certain temperature, they undergo a chemical reaction (crosslinking) that causes them to solidify and become irreversible. Afterward, they no longer soften or flow upon subsequent heating. This characteristic is crucial for molding, utilizing the plasticizing flow during initial heating to fill the mold cavity under pressure and then solidify into a product of a defined shape and size. Common thermosetting plastics include phenolics, epoxies, aminoplasts, unsaturated polyesters, and alkyds.

[0060] In one embodiment, the insulating member 3 is made of thermoplastic material. Furthermore, the overlapping area S of the orthographic projections of the pole 2, the housing 1 and the insulating member 3 on the first surface 11 and the thermogravimetric weight loss rate A of the insulating member 3 at 460°C satisfy 1≤S / A≤74.

[0061] It is worth noting that thermoplastic materials can reduce the brittleness of the insulating member 3, preventing the insulating member 3 from cracking due to compression. However, thermoplastic materials are easily affected by high temperatures and melt. Therefore, by relatively increasing the overlapping area between the housing 1 and the pole 2 and the insulating member, the compression force on the insulating member 3 is relatively reduced, thus preventing the insulating member 3 from being squeezed and overflowing.

[0062] It should be noted that thermoplastic materials, such as thermoplastics, are plastics that soften upon heating and harden upon cooling. Thermoplastics are primarily composed of thermoplastic resins, with various additives added. Under certain temperature conditions, plastics can soften or melt into any shape, retaining their shape upon cooling. This state can be repeated multiple times while maintaining plasticity, and this repetition is merely a physical change. Common thermoplastics include polypropylene, polyvinyl chloride, polystyrene, polyoxymethylene, polycarbonate, polyamide, acrylics, other polyolefins and their copolymers, polysulfone, and polyphenylene ether.

[0063] In one embodiment, Figure 4 、 Figure 8 and Figure 10 As shown, in a direction perpendicular to the first surface 11, the thickness of the insulating member 3 sandwiched between the housing 1 and the terminal 2 is h, satisfying 0.05mm≤h≤4mm. This arrangement ensures a sufficient creepage distance between the housing 1 and the terminal 2 to ensure insulation effectiveness while preventing failure of the insulating member 3, which could lead to a large gap between the housing 1 and the terminal 2. This could cause the insulating member 3 and the terminal 2 to easily move and misalign, leading to problems such as battery short circuits.

[0064] It is worth noting that if h>4mm, the thickness of the insulating member 3 located between the housing 1 and the side of the terminal 2 away from the accommodation space is too large, resulting in a large amount of material consumption for the insulating member 3, resulting in a waste of production costs. At the same time, the insulating member 3 occupies too much volume, resulting in a reduced battery space utilization rate, affecting the battery's energy density. In order to ensure the battery's energy density, it is necessary to reduce the thickness of the housing 1 (specifically, the folded edge 142) and / or the thickness of the terminal 2 in the direction perpendicular to the first surface 11, resulting in a weakening of the battery's structural strength. In addition, when the insulating member 3 melts or cracks, resulting in insulation failure, a large gap will be generated between the housing 1 and the terminal 2, causing the insulating member 3 and the terminal 2 to easily move and misalign, causing problems such as battery short circuits. If h<0.05mm, the creepage distance between the housing 1 and the terminal 2 is too short, the insulation effect of the insulating member 3 is poor, and it is easy to cause problems such as battery short circuits.

[0065] Optionally, the value of h is 0.05mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, or 4mm, or a value between any two values.

[0066] In one embodiment, Figure 4 、 Figure 8 and Figure 10 As shown, the battery housing assembly further includes a sealing ring 5, which is compressed and arranged between the housing 1 and the pole 2. The sealing ring 5 is provided to ensure a sealing effect between the housing 1 and the pole 2.

[0067] It is worth noting that, in this embodiment, by limiting the thermal gravimetric weight loss rate A of the insulating member 3 and the ratio of the overlapping area S of the orthographic projections of the pole 2, the housing 1 and the insulating member 3 on the first surface 11, the insulating member 3 is prevented from melting, cracking and being squeezed out between the housing 1 and the pole 2, thereby avoiding the formation of a gap between the housing 1 and the pole 2, avoiding the movement and dislocation of the pole 2, and further avoiding the misalignment between the sealing ring 5 and the pole 2, thereby avoiding the occurrence of sealing failure problems and ensuring the sealing effect.

[0068] In one embodiment, the housing 1 is cylindrical and meets the requirements of 10 mm. 2 ≤S≤50mm 2 , 0.6≤S / A≤24.

[0069] In another embodiment, the housing 1 is a quadrangular prism, meeting the requirements of 50mm 2 ≤S≤150mm 2 , 2.8≤S / A≤74.

[0070] It is worth noting that when the shell 1 is cylindrical, the corresponding battery formed is a cylindrical battery; when the shell 1 is a quadrangular prism, the corresponding battery formed is a square shell battery.

[0071] According to an embodiment of the present invention, on the other hand, a battery is provided, comprising: the above-mentioned battery shell assembly; a battery cell 4, arranged in the accommodating space, the battery cell 4 comprising a battery cell 4 body and a tab extending from the end of the battery cell 4 body, the tab being electrically connected to the pole 2.

[0072] In one embodiment, the pole 2 is arranged on the cover 16, satisfying 1≤S / A≤74. It is worth noting that the cover 16 and the shell 15 are welded, and the shell 15 has a poor restraining effect on the cover 16. There is a risk of deformation of the cover 16 and the pole 2, which makes the insulating part 3 relatively more likely to be squeezed out and cause insulation failure and battery short circuit. Therefore, when the thermal gravimetric weight loss rate of the insulating part 3 is constant, the overlapping area of the outer shell 1 and the pole 2 with the insulating part can be relatively increased, thereby reducing the pressure on the insulating part 3, avoiding the insulating part 3 from being squeezed out, ensuring the insulation effect of the insulating part 3 and avoiding the occurrence of safety problems such as battery short circuit. Alternatively, when the overlapping area of the outer shell 1 and the pole 2 with the insulating part is constant, the thermal gravimetric weight loss rate of the insulating part 3 can be relatively reduced, so that the insulating part 3 can have better thermosetting properties when heated, avoiding the melting of the insulating part 3 and being squeezed out.

[0073] Further, such as Figure 16As shown, the housing 15 includes a cover mating portion 151 that encloses an opening and a cell mating portion 152 that encloses a receiving space. The wall thickness of the housing 15 at the cover mating portion 151 is greater than that at the cell mating portion 152. Therefore, when welding the cover 16 and the cover mating portion 151 of the housing 15, a greater penetration depth is achieved, enhancing the connection strength between the cover 16 and the housing 15, improving the restraining effect of the housing 15 on the cover 16, reducing the risk of deformation of the cover 16 and the terminal 2, and further reducing the possibility of extrusion of the insulating member 3.

[0074] It is worth noting that, please refer to Figure 16 The wall thickness of the cover mating portion 151 is t1, and the wall thickness of the battery cell mating portion 152 is t2, satisfying t1>t2.

[0075] In another embodiment, the pole 2 is arranged on the shell 15, satisfying 0.6≤S / A≤70. That is, the pole 2 is arranged on at least one side wall of the shell 15. It is worth noting that the side wall of the shell 15 and the other adjacent walls are usually integrally formed. Therefore, the overall structural strength of the shell 15 is relatively high and not easy to deform, making it less likely that the insulating part 3 will be squeezed out. Therefore, when the thermal gravimetric weight loss rate of the insulating part 3 is constant, the overlapping area of the outer shell 1 and the pole 2 and the insulating part can be relatively reduced. At this time, it can not only ensure that the insulating part 3 is stably located between the outer shell 1 and the pole 2, thereby ensuring the insulation effect of the insulating part 3 and avoiding the occurrence of safety problems such as battery short circuit, but also further increase the heat dissipation area of the pole 2, improve the heat dissipation effect of the pole 2, reduce the risk of thermal runaway of the battery, and improve the safety performance of the battery. Alternatively, when the overlapping area of the housing 1, the pole 2 and the insulating part is constant, the thermal weight loss rate of the insulating part 3 can be relatively increased, while preventing the insulating part 3 from cracking. At the same time, the insulating part 3 will not be squeezed out because the extrusion force it receives is relatively small.

[0076] It should be noted that, for the battery of this embodiment, the shell 1 may be made of aluminum, steel or other metal materials; the battery may be a cylindrical battery, a square shell battery, or a hexagonal prism battery.

[0077] According to another aspect of an embodiment of the present invention, a battery pack is provided, comprising: the above-mentioned battery, wherein a plurality of batteries are provided; and a bus bar 6 welded to a side of the poles 2 of at least two batteries away from the accommodation space.

[0078] The battery pack of this embodiment uses the above-mentioned battery. In the shell assembly of the above-mentioned battery, by limiting the ratio of the thermal gravimetric weight loss rate A of the insulating member and the overlapping area S of the positive projection of the pole, the shell and the insulating member on the first surface, while ensuring the current flow capacity of the pole and the busbar and avoiding safety risks such as thermal runaway of the battery, the insulating effect of the insulating member between the pole and the shell is guaranteed, avoiding the movement and dislocation of the pole, and avoiding the occurrence of safety problems such as battery short circuit.

[0079] Specifically, if S / A>74, when the outer shell covers the side of the pole away from the accommodation space, the covered area is too large, resulting in the area of the pole away from the accommodation space for welding with the bus (the area of the part not covered by the outer shell) being too small, resulting in poor overcurrent capacity of the pole and the bus, which cannot meet the overcurrent requirements of the pole, affecting the overall charge and discharge rate of the battery. In addition, when the battery is fast charged at a high rate, the heat generated by the pole and the bus is large, and the heat dissipation effect of the pole is poor, resulting in a higher risk of thermal runaway of the battery; or, the brittleness of the insulating component is too large, which can easily cause the insulating component to crack, thereby causing insulation failure and resulting in safety risks such as battery short circuit.

[0080] If S / A is less than 0.6, the insulating part will be subjected to excessive extrusion pressure from the outer shell and the pole, which may easily cause the insulating part to be squeezed out, resulting in a gap between the outer shell and the pole, causing the insulating part and the pole to easily move and dislocate, which may easily cause insulation failure and battery short circuit problems; or, the insulating part may have poor thermosetting properties, and when the insulating part is subjected to high temperature, it may easily melt and overflow under the extrusion pressure of the outer shell and the pole, which may also cause a gap between the outer shell and the pole, causing the insulating part and the pole to easily move and dislocate, which may easily cause insulation failure and battery short circuit problems; and, when the pole is pressed onto the first surface, the overall area of the pole will be smaller, and the area of the pole used for welding to the busbar will be too small, resulting in poor overcurrent capacity of the pole and the busbar, which cannot meet the overcurrent requirements of the pole, affecting the overall charge and discharge rate of the battery, and, when the battery is fast charged at a high rate, the heat generated by the pole and the busbar is large, and the heat dissipation effect of the pole is poor, resulting in a higher risk of thermal runaway of the battery.

[0081] It is worth noting that when welding the pole 2 to the busbar 6, the insulating member 3 is also susceptible to being heated and melted. Therefore, in this embodiment, by limiting the thermal weight loss rate A of the insulating member 3 and the ratio of the overlapping area S of the orthographic projections of the pole 2, the housing 1, and the insulating member 3 on the first surface 11, it is possible to ensure the current carrying capacity of the pole 2 and the busbar 6, avoiding safety risks such as thermal runaway of the battery, while also preventing the insulating member 3 from being heated and melting, and ensuring the reliability and insulation effect of the insulating member 3 between the pole 2 and the housing 1, thereby preventing the pole 2 from moving and misaligning, and avoiding safety issues such as battery short circuits.

[0082] For the first embodiment of the battery shell assembly, the overlapping area S of the orthographic projections of the electrode 2, the shell 1, and the insulating member 3 on the first surface 11 and the thermogravimetric weight loss rate A of the insulating member 3 at 460°C satisfy 1.2≤S / A≤74. It is worth noting that for the first embodiment of the battery shell 1 assembly, when the electrode 2 and the busbar 6 are welded, the insulating member 3 is subjected to a large amount of heat, which increases the risk of melting the insulating member 3. Therefore, by further limiting the value of S / A, the extrusion force exerted on the insulating member 3 by the shell 1 and the electrode 2 is further reduced and / or the thermosetting property of the insulating member 3 is further improved, thereby further ensuring the reliability of the insulating member 3 between the electrode 2 and the shell 1, ensuring the insulation effect of the insulating member 3 between the electrode 2 and the shell 1, preventing the electrode 2 from moving and misaligning, and avoiding the occurrence of safety issues such as battery short circuits.

[0083] In one embodiment, Figure 17 As shown, the pole 2 and busbar 6 are welded to form a weld zone 7. In a cross section perpendicular to the first surface 11, the minimum distance d between the edge of the weld zone 7 and the edge of the insulating member 3 satisfies the condition 0.4 mm ≤ d ≤ 18 mm. This arrangement ensures the current carrying capacity of the pole 2 and busbar 6 while reducing the risk of thermal melting of the insulating member 3.

[0084] It is worth noting that if d>18mm, the distance between the edge of the welding area 7 and the edge of the insulating part 3 is too large, which will cause the area of the welding area 7 to be too small, resulting in poor overcurrent capacity of the pole 2 and the bus 6, and unable to meet the overcurrent requirements of the pole 2, affecting the overall charge and discharge rate of the battery. If the welding area 7 is to ensure that it has a sufficient area, the overall volume of the pole 2 will be too large, resulting in reduced space utilization of the battery and affecting the layout of other components on the shell 1; if d<0.4mm, the welding area 7 is too close to the insulating part 3, and the insulating part 3 is greatly affected by the welding heat of the pole 2 and the bus 6. The risk of melting the insulating part 3 due to heat increases, affecting the reliability of the insulating part 3 between the shell 1 and the pole 2.

[0085] Optionally, the value of d is 0.4mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, 10.5mm, 11mm, 11.5mm, 12mm, 12.5mm, 13mm, 13.5mm, 14mm, 14.5mm, 15mm, 15.5mm, 16mm, 16.5mm, 17mm, 17.5mm, or 18mm, or a value between any two values.

[0086] Batteries with different S / A values were tested below, and the test results for the example batteries and comparative example batteries are shown in Table 1. The example batteries refer to batteries whose S / A values meet the requirements of this example, and correspondingly, the comparative example batteries refer to batteries whose S / A values do not meet the requirements of this example.

[0087] Table 1 Battery test results

[0088] <![CDATA[S(mm 2 )]]> A(％) <![CDATA[S / A(mm 2 / %)]]> Heat dissipation performance Insulation performance Example 1 10 16.67 0.6 qualified qualified Example 2 150 2.03 74 qualified qualified Example 3 146 2 73 qualified qualified Example 4 12.6 18 0.7 qualified qualified Example 5 84 6 14 qualified qualified Example 6 131.2 4.1 32 qualified qualified Example 7 8.7 1.6 5.44 qualified qualified Example 8 162 22 7.36 qualified qualified Comparative Example 1 132.6 1.7 78 Unqualified qualified Comparative Example 2 8 14.55 0.55 qualified Unqualified

[0089] As can be seen from Table 1, in Examples 1 to 8, the value of S / A satisfies 0.6≤S / A≤74. Therefore, the heat dissipation performance test and insulation performance test of the batteries in Examples 1 to 8 are all qualified.

[0090] It can be seen from Table 1 that in Comparative Example 1, the value of S / A is greater than 74, that is, the value of S / A is too large, resulting in the battery heat dissipation performance test of Comparative Example 1 failing.

[0091] It can be seen from Table 1 that in Comparative Example 2, the value of S / A is less than 0.6, that is, the value of S / A is too small, resulting in the battery insulation performance test of Comparative Example 2 failing.

[0092] The following introduces the thermogravimetric weight loss rate test method, heat dissipation performance test method and insulation performance test method.

[0093] (1) Testing method of thermogravimetric weight loss rate A:

[0094] A sample weighing 0.4 mg was obtained and tested using a NETZSCH brand thermogravimeter. The initial temperature was set at 40°C and the temperature was raised to 460°C at a heating rate of 10°C / min to obtain the thermogravimetric weight loss rate A of the sample.

[0095] (2) Test method for heat dissipation performance:

[0096] At 25° C., the lithium-ion batteries prepared in the examples and comparative examples were tested according to the following procedures.

[0097] For lithium iron phosphate batteries:

[0098] 1) Connect the electrode to the temperature sensor, charge at a constant current rate of 4C to 3.65V, and then charge at a constant voltage until the current drops to 0.05C. Record the temperature of the electrode area during the charging process;

[0099] 2) Obtain the maximum temperature T of the electrode area during charging. If the maximum temperature T of the electrode area is ≤ 65°C, the battery is qualified; if T is greater than 65°C, the battery is unqualified.

[0100] For ternary batteries:

[0101] 1) Connect the electrode to the temperature sensor, charge at a constant current rate of 4C to 4.25V, and then charge at a constant voltage until the current drops to 0.05C. Record the temperature of the electrode area during the charging process;

[0102] 2) Obtain the maximum temperature T of the electrode area during charging. If the maximum temperature T of the electrode area is ≤55°C, the battery is qualified; if T>55°C, the battery is unqualified.

[0103] (3) Test method for insulation performance:

[0104] At 25° C., the lithium-ion batteries prepared in the examples and comparative examples were subjected to cycle tests according to the following procedures.

[0105] For lithium iron phosphate batteries:

[0106] 1) Charge at a constant current rate of 1C to 3.65V, and then charge at a constant voltage until the current drops to 0.05C;

[0107] 2) Let it sit for 30 minutes;

[0108] 3) Discharge at a rate of 1C to 2.5V;

[0109] 4) Let it sit for 30 minutes;

[0110] Repeat steps 1)-4) for 20 cycles. Set the voltage tester's alarm current to 0.1mA and the voltage between its two output terminals to 1kV. Connect the battery's housing and terminals to the two output terminals and apply the set voltage. If the voltage tester sounds an alarm, a short circuit has occurred between the terminal and the housing, indicating an insulation failure. If no alarm sounds, no short circuit has occurred between the terminal and the housing, indicating an insulation failure.

[0111] For ternary batteries:

[0112] 1) Charge at a constant current rate of 1C to 4.35V, and then charge at a constant voltage until the current drops to 0.05C;

[0113] 2) Let it sit for 20 minutes;

[0114] 3) Discharge at a rate of 1C to 2.75V;

[0115] 4) Let it sit for 20 minutes;

[0116] Repeat steps 1)-4) for 20 cycles. Set the voltage tester's alarm current to 0.1mA and the voltage between its two output terminals to 1kV. Connect the battery's housing and terminals to the two output terminals and apply the set voltage. If the voltage tester sounds an alarm, a short circuit has occurred between the terminal and the housing, indicating an insulation failure. If no alarm sounds, no short circuit has occurred between the terminal and the housing, indicating an insulation failure.

[0117] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery housing assembly, characterized in that: include: A housing (1) encloses and forms a receiving space, wherein the housing (1) has a first surface (11); A pole (2) is provided on the first surface (11); an insulating member (3) at least partially sandwiched between the housing (1) and the pole (2); The overlapping area of the orthographic projections of the pole (2), the housing (1) and the insulating member (3) on the first surface (11) is S, the thermogravimetric weight loss rate of the insulating member (3) at 460° C. is A, and 0.6≤S / A≤74 is satisfied, and the unit of S / A is mm. 2 / %.

2. The battery housing assembly according to claim 1, wherein: The overlapping area S of the orthographic projections of the pole (2), the housing (1) and the insulating member (3) on the first surface (11) satisfies 10 mm 2 ≤S≤150mm 2 .

3. The battery housing assembly according to claim 1, wherein: The insulating member (3) has a thermogravimetric weight loss rate A at 460° C. that satisfies 2%≤A≤18%.

4. The battery housing assembly according to any one of claims 1 to 3, characterized in that: The housing (1) comprises a protrusion (14) provided on the first surface (11), the protrusion (14) forming a flange that is snap-fitted to a side of the pole (2) away from the accommodation space, and the insulating member (3) is at least partially provided between a side of the pole (2) away from the accommodation space and a side of the protrusion (14) close to the accommodation space.

5. The battery housing assembly according to claim 4, wherein: The housing (1) further comprises a main body (13), and the protrusion (14) is welded to the main body (13), satisfying 0.6≤S / A≤72.

6. The battery housing assembly according to claim 4, wherein: The housing (1) further comprises a main body (13), and the protrusion (14) is integrally provided with the main body (13), satisfying 0.8≤S / A≤74.

7. The battery housing assembly according to claim 4, wherein: The protrusion (14) is made of steel and satisfies 0.8≤S / A≤74.

8. The battery housing assembly according to claim 4, wherein: The protruding portion (14) is made of aluminum and satisfies 0.6≤S / A≤72.

9. The battery housing assembly according to any one of claims 1 to 3, characterized in that: The pole (2) is at least partially pressed onto the first surface (11), and the insulating member (3) is at least partially arranged between the first surface (11) and a side of the pole (2) close to the accommodating space.

10. The battery housing assembly according to any one of claims 1 to 3, characterized in that: The insulating member (3) is made of thermosetting material.

11. The battery housing assembly according to claim 10, wherein: The overlapping area S of the orthographic projections of the pole (2), the housing (1) and the insulating member (3) on the first surface (11) and the thermal gravimetric weight loss rate A of the insulating member (3) at 460°C satisfy 0.6≤S / A≤70.

12. The battery housing assembly according to any one of claims 1 to 3, characterized in that: The insulating member (3) is made of thermoplastic material.

13. The battery housing assembly according to claim 12, wherein: The overlapping area S of the orthographic projections of the pole (2), the housing (1) and the insulating member (3) on the first surface (11) and the thermogravimetric weight loss rate A of the insulating member (3) at 460°C satisfy 1≤S / A≤74.

14. The battery housing assembly according to any one of claims 1 to 3, characterized in that: In a direction perpendicular to the first surface (11), the thickness of the insulating member (3) sandwiched between the housing (1) and the pole (2) is h, satisfying 0.05 mm ≤ h ≤ 4 mm.

15. The battery housing assembly according to any one of claims 1 to 3, characterized in that: The battery housing assembly further comprises a sealing ring (5), which is compressed and arranged between the housing (1) and the pole (2).

16. The battery housing assembly according to any one of claims 1 to 3, characterized in that: The housing (1) is cylindrical and meets the requirements of 10mm 2 ≤S≤50mm 2 , 0.6≤S / A≤24.

17. The battery housing assembly according to any one of claims 1 to 3, characterized in that: The housing (1) is a quadrangular prism, meeting the requirements of 50mm 2 ≤S≤150mm 2 , 2.8≤S / A≤74.

18. A battery, characterized in that: include: The housing assembly of the battery according to any one of claims 1 to 17; A battery cell (4) is arranged in the accommodation space, and the battery cell (4) comprises a battery cell (4) body and a tab extending from an end of the battery cell (4) body, wherein the tab is electrically connected to the pole (2).

19. The battery according to claim 18, characterized in that The housing (1) comprises a shell (15) and a cover plate (16); the shell (15) has at least one opening; the cover plate (16) is connected to the shell (15) and blocks the opening; the shell (15) and the cover plate (16) enclose to form the accommodating space.

20. The battery according to claim 19, characterized in that The pole (2) is arranged on the cover plate (16), satisfying 1≤S / A≤74.

21. The battery according to claim 20, characterized in that The shell (15) comprises a cover plate fitting portion (151) enclosing the opening and a battery cell fitting portion (152) enclosing the accommodation space, and the wall thickness of the shell (15) at the cover plate fitting portion (151) is greater than the wall thickness at the battery cell fitting portion (152).

22. The battery according to claim 19, characterized in that The pole (2) is arranged on the housing (15) and satisfies 0.6≤S / A≤70.

23. A battery pack, characterized in that: include: The battery according to any one of claims 18 to 22, wherein a plurality of batteries are provided; A busbar (6) is welded to a side of at least two battery poles (2) away from the accommodation space.

24. The battery pack according to claim 23, wherein: The housing (1) comprises a protrusion (14) provided on the first surface (11), the protrusion (14) forming a flange that is snap-fitted to a side of the pole (2) away from the accommodation space, and the insulating member (3) is at least partially provided between a side of the pole (2) away from the accommodation space and a side of the protrusion (14) close to the accommodation space; The overlapping area S of the orthographic projections of the pole (2), the housing (1) and the insulating member (3) on the first surface (11) and the thermal gravimetric weight loss rate A of the insulating member (3) at 460°C satisfy 1.2≤S / A≤74.

25. The battery pack according to claim 24, wherein: The pole (2) and the busbar (6) are welded to form a welding area (7); in a cross section perpendicular to the first surface (11), the minimum distance d between the edge of the welding area (7) and the edge of the insulating member (3) satisfies 0.4 mm ≤ d ≤ 18 mm.

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