Battery and electric equipment

Abstract

The invention discloses a battery and electric equipment, the battery comprises an electrode assembly, a shell and a pole, and the electrode assembly is accommodated in the shell. The shell comprises a first wall, a second wall and a peripheral side wall, wherein the first wall and the second wall are oppositely arranged in the first direction, and the peripheral side wall is arranged between the first wall and the second wall in a surrounding mode. The first direction is the thickness direction of the battery. The first wall comprises a reinforcing part which protrudes out of the peripheral side wall. The peripheral side wall comprises a top wall and a bottom wall which are oppositely arranged in the second direction, a through hole is formed in the top wall, and the pole is arranged in the through hole. In the battery, the reinforcing part convexly extends out of the peripheral side wall, when the battery is expanded, the reinforcing part can inhibit the edge of the first wall from generating creases, reduce the pulling on the peripheral side wall, support the peripheral side wall, reinforce the structural strength of the peripheral side wall and improve the pulling deformation resistance of the peripheral side wall, so that the collapse risk of the peripheral side wall is reduced, and the service life of the battery is prolonged. The safety performance of the battery is improved.

Description

Batteries and electrical equipment Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a battery and electrical equipment. Background Art

[0002] With the popularity of portable electronic devices, people have higher and higher requirements for the safety of batteries in them. Hard shell batteries (such as steel shell batteries) are widely used due to their high safety and easy processing and manufacturing.

[0003] Summary of the Invention

[0004] However, the inventors of this application have discovered that when the shell of a hard-shell battery expands due to abnormal gas production, the bulging main wall will pull on the side wall, causing creases and collapse in the side wall. The collapsed area can easily squeeze the electrode and cause a short circuit, affecting the safety of the battery.

[0005] In view of the above situation, it is necessary to provide a battery with better safety performance.

[0006] In a first aspect of the present application, a battery is provided, comprising an electrode assembly, a housing, and a terminal, wherein the electrode assembly is housed in the housing. The housing comprises a first wall and a second wall disposed opposite each other along a first direction, and a peripheral sidewall disposed between the first wall and the second wall. The first direction is the thickness direction of the battery. The first wall comprises a reinforcement portion, the reinforcement portion protruding from the peripheral sidewall. The peripheral sidewall comprises a top wall and a bottom wall disposed opposite each other along a second direction, the top wall having a through hole, and the terminal disposed in the through hole.

[0007] In the above solution, the reinforcing portion protrudes from the peripheral side wall. When the battery expands, the reinforcing portion can suppress the formation of creases at the edge of the first wall, reduce the pulling on the peripheral side wall, and at the same time form support for the peripheral side wall, strengthen the structural strength of the peripheral side wall, and improve the ability of the peripheral side wall to resist pulling deformation, thereby reducing the risk of collapse of the peripheral side wall and improving the safety performance of the battery.

[0008] In some embodiments, the first wall and the peripheral side wall are connected by welding to improve the connection strength between the first wall and the peripheral side wall.

[0009] In some embodiments, the shell contains metal elements, and the metal elements include at least one of Mg, Al, Zn, Fe, Sn, Cu, Ag, Pt, Au, and Mn, which are used to improve the structural strength of the shell and make the shell conductive.

[0010] In some embodiments, the peripheral sidewall includes a sidewall body and a flange. The flange is disposed at one end of the peripheral sidewall adjacent to the first wall, and one side surface of the flange is connected to the first wall. The reinforcement portion protrudes from an edge of the flange away from the sidewall body to enhance the structural strength of the peripheral sidewall and improve its ability to resist tensile deformation.

[0011] In some embodiments, the reinforcing portion is bent toward the peripheral side wall to reduce space waste caused by the reinforcing portion protruding from the peripheral side wall, thereby increasing the energy density of the battery, and further strengthening the structural strength of the peripheral side wall to improve the ability of the peripheral side wall to resist pulling deformation.

[0012] In some embodiments, the first wall includes a main body portion, which is connected to the peripheral side wall. The main body portion and the reinforcement portion are integrally formed to simplify the manufacturing process of the reinforcement portion, while further strengthening the structural strength of the first wall, inhibiting the formation of creases at the edge of the first wall when the battery expands, and reducing the pulling on the peripheral side wall.

[0013] In some embodiments, the peripheral side wall further includes a first side wall and a second side wall arranged opposite to each other along a third direction, the first direction, the second direction and the third direction are perpendicular to each other, and the reinforcement portion protrudes from at least one of the group consisting of the top wall, the bottom wall, the first side wall and the second side wall.

[0014] In some embodiments, the length of the top or bottom wall in the third direction is greater than the length of the first or second side wall in the second direction, and the reinforcement protrudes from the top or bottom wall. When the battery expands, the side edge of the main body connected to the top or bottom wall is more likely to form a stress concentration point, causing bending. The reinforcement protrudes from the top or bottom wall, allowing the reinforcement to connect to the longer side edge of the main body to correspond to the stress concentration point of the main body, further reducing the risk of creases forming at the edge of the first wall and causing the corresponding top or bottom wall to collapse, thereby improving the safety performance of the battery.

[0015] In some embodiments, the electrode assembly has a wound structure, the winding axis of the wound structure is oriented in the same direction as the second direction, and the reinforcement portion protrudes from the top or bottom wall. When the battery expands and causes the peripheral side wall to collapse, the collapsed area squeezes the wound end surface of the wound structure, which can easily cause a positive-negative short circuit. The reinforcement portion protrudes from the top or bottom wall to reduce the risk of creases forming at the edge of the first wall, which could cause the corresponding top or bottom wall to collapse and squeeze the wound end surface, thereby improving the safety of the battery.

[0016] In some embodiments, the reinforcement portion includes a plurality of sub-portions spaced apart along the second direction or the third direction, so as to disperse the force on the reinforcement portion and improve the collapse suppression effect.

[0017] In some embodiments, the battery further includes a circuit board assembly located on one side of the top wall. The top wall and circuit board assembly are connected and fixed via adhesive. Supported by the circuit board assembly, the top wall has a higher structural strength than the bottom wall. When the battery expands, the side edge where the main body connects to the bottom wall tends to pull on the bottom wall, causing deformation. This makes the side edge where the main body connects to the bottom wall more susceptible to stress concentration, leading to bending. The reinforcement protruding from the bottom wall reduces the risk of creases forming at the edge of the first wall and causing the bottom wall to collapse, thereby improving the safety performance of the battery.

[0018] In some embodiments, the reinforcement portion protrudes from the top or bottom wall. Along the third direction, the relationship between the length I1 of the reinforcement portion and the length L1 of the top or bottom wall satisfies the following: I1 ≥ 10% L1. The length I1 of the reinforcement portion is the length of the side edge of the reinforcement portion connected to the main body portion. For example, if the reinforcement portion protrudes from the bottom wall, the length L1 of the bottom wall is the length of the side edge of the main body portion connected to the bottom wall. By controlling I1 ≥ 10% L1, the reinforcement portion can better suppress creases at the edge of the first wall during battery expansion, reducing strain on the bottom wall. It can also better support the bottom wall, strengthening its structural strength and improving its resistance to strain deformation, thereby reducing the risk of bottom wall collapse and enhancing battery safety. This also applies when the reinforcement portion protrudes from the top wall.

[0019] In some embodiments, the reinforcement portion protrudes from the first or second sidewall. Along the second direction, the relationship between the length I2 of the reinforcement portion and the length L2 of the first or second sidewall satisfies the following: I2 ≥ 10% L2. The length I2 of the reinforcement portion is the length of the side edge of the reinforcement portion connected to the main body portion. For example, if the reinforcement portion protrudes from the second sidewall, the length L2 of the second sidewall is the length of the side edge of the main body portion connected to the second sidewall. By controlling I2 ≥ 10% L2, the reinforcement portion can better suppress creases at the edge of the first wall during battery expansion, reducing strain on the second sidewall. It can also better support the second sidewall, strengthen its structural strength, and improve its ability to resist deformation due to strain, thereby reducing the risk of collapse and enhancing the battery's safety. This also applies when the reinforcement portion protrudes from the first sidewall.

[0020] In some embodiments, the protruding width W1 of the reinforcement portion along its protruding direction satisfies the following conditions: W1 ≥ 0.1 mm. By controlling W1 ≥ 0.1 mm, the structural strength of the reinforcement portion can be improved, effectively suppressing the collapse of the peripheral sidewall. It should be noted that when the reinforcement portion is trapezoidal, semicircular, triangular, or other shapes, the portion that meets the above range is the effective portion of the reinforcement portion.

[0021] In some embodiments, the reinforcement portion protrudes from the top or bottom wall. Along the third direction, the spacing m1 between the end of the reinforcement portion proximate the first sidewall and the first sidewall, and the spacing m2 between the end of the reinforcement portion proximate the second sidewall and the second sidewall satisfy the following relationship: 0 ≤ m1 ≤ 43% L1, 0 ≤ m2 ≤ 43% L1. For example, when the reinforcement portion protrudes from the bottom wall, the center of the side where the main portion of the first wall connects to the bottom wall is prone to creases, which in turn causes the center of the bottom wall to collapse. By controlling the values ​​of 0 ≤ m1 ≤ 43% L1 and 0 ≤ m2 ≤ 43% L1, the reinforcement portion can reinforce the center of the connection between the main portion of the first wall and the bottom wall, which is more prone to creases. This effectively prevents creases at the edge of the first wall and collapse of the bottom wall, thereby improving battery safety. The above range is also met when the reinforcement portion protrudes from the top wall.

[0022] In some embodiments, the reinforcement portion protrudes from the first or second sidewall. Along the second direction, the length L2 of the second sidewall, the spacing m3 between the end of the reinforcement portion facing the top wall and the top wall, and the spacing m4 between the end of the reinforcement portion facing the bottom wall and the bottom wall satisfy the following conditions: 0 ≤ m3 ≤ 43% L2, 0 ≤ m4 ≤ 43% L2. Taking the reinforcement portion protruding from the second sidewall as an example, by controlling the values ​​of 0 ≤ m3 ≤ 43% L2 and 0 ≤ m4 ≤ 43% L2, the reinforcement portion can reinforce the center of the connection between the main portion of the first wall and the second sidewall, which is more prone to creases. This effectively prevents creases at the edges of the first wall and collapse of the second sidewall, thereby improving battery safety. The above ranges are also met when the reinforcement portion protrudes from the first sidewall.

[0023] In a second aspect, the present application further provides an electrical device comprising the battery according to any one of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 is a schematic structural diagram of a battery in one embodiment of the present application.

[0025] FIG2 is a schematic diagram of the disassembled structure of a battery in one embodiment of the present application.

[0026] FIG3 is a schematic structural diagram of a bent reinforcement portion in an embodiment of the present application.

[0027] FIG4 is a schematic structural diagram of a battery in another embodiment of the present application.

[0028] FIG5 is a schematic structural diagram of a subdivision in an embodiment of the present application.

[0029] FIG6 is a schematic diagram showing the position of a circuit board assembly in one embodiment of the present application.

[0030] FIG7 is a schematic diagram of a first size structure of a battery in one embodiment of the present application.

[0031] FIG8 is a schematic diagram of a second-size structure of a battery in one embodiment of the present application.

[0032] FIG9 is a schematic diagram of a third-size structure of a battery in one embodiment of the present application.

[0033] FIG10 is a schematic structural diagram of an electrical device in an embodiment of the present application.

[0034] Description of Main Component Symbols Battery 100 Electric Device 200 Electrode Assembly 10 Top Surface 11 Bottom Surface 12 Straight Section 13 Curved Section 14 Housing 20 First Wall 21 Reinforcement 211 First Side 211a Second Side 211b Third Side 211c First Portion 211d Second Portion 211e Main Body 212 Second Wall 22 Side Wall 23 Side Wall Body 23a Flange 23b Top Wall 231 Through Hole 2311 Bottom Wall 232 First Side Wall 233 Second Side Wall 234 Post 30 Circuit Board Assembly40 First direction Z Second direction X Third direction Y

[0035] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0037] It should be noted that when an element is considered to be “connected” to another element, it may be directly connected to the other element or there may be a centrally disposed element. When an element is considered to be “disposed on” another element, it may be directly disposed on the other element or there may be a centrally disposed element.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0039] The inventors of this application have discovered that when the shell of a hard-shell battery expands due to abnormal gas production, the bulging main wall will pull the side wall, causing creases and collapse in the side wall. The collapsed area can easily squeeze the electrode and cause a short circuit, affecting the safety of the battery.

[0040] In a first aspect of the present application, a battery is provided, comprising an electrode assembly, a housing, and a terminal, wherein the electrode assembly is housed in the housing. The housing comprises a first wall and a second wall disposed opposite each other along a first direction, and a peripheral sidewall disposed between the first wall and the second wall, wherein the first direction is the thickness direction of the battery. The first wall comprises a reinforcement portion, the reinforcement portion protruding from the peripheral sidewall. The peripheral sidewall comprises a top wall and a bottom wall disposed opposite each other along a second direction, the top wall having a through hole, and the terminal disposed in the through hole.

[0041] In the above solution, the reinforcement portion protrudes from the peripheral sidewall. When the battery expands, the reinforcement portion can suppress the formation of creases at the edge of the first wall, reducing the pulling on the peripheral sidewall. At the same time, it can provide support for the peripheral sidewall, strengthen the structural strength of the peripheral sidewall, and improve the ability of the peripheral sidewall to resist pulling deformation, thereby reducing the risk of peripheral sidewall collapse and improving the safety performance of the battery. The following is a further description of the embodiments of the present application with reference to the accompanying drawings.

[0042] Referring to Figures 1 and 2 , an embodiment of the present application provides a battery 100 comprising an electrode assembly 10, a housing 20, and an electrode post 30. The electrode assembly 10 is housed in the housing 20 and is configured to convert chemical energy into electrical energy. Optionally, the electrode assembly 10 has a wound structure or a laminated structure.

[0043] The housing 20 is made of a metal material to improve the structural strength of the housing 20 and to make the housing 20 conductive. Optionally, the housing 20 contains a metal element, and the metal element includes at least one of Mg, Al, Zn, Fe, Sn, Cu, Ag, Pt, Au, and Mn.

[0044] The thickness direction of the battery 100 is defined as a first direction Z. The housing 20 includes a first wall 21 and a second wall 22 disposed opposite each other along the first direction Z, and a peripheral side wall 23 disposed between the first wall 21 and the second wall 22. The first wall 21, the second wall 22, and the peripheral side wall 23 form a sealed space for accommodating the electrode assembly 10. Optionally, the first wall 21 and the peripheral side wall 23 are connected by welding to improve the connection strength between the first wall 21 and the peripheral side wall 23.

[0045] The first wall 21 includes a reinforcing portion 211, which protrudes from the peripheral side wall 23. When the battery expands, the reinforcing portion 211 can suppress the generation of creases at the edge of the first wall 21, reduce the pulling on the peripheral side wall 23, and at the same time form support for the peripheral side wall 23, strengthen the structural strength of the peripheral side wall 23, and improve the ability of the peripheral side wall 23 to resist pulling deformation, thereby reducing the risk of collapse of the peripheral side wall 23 and improving the safety performance of the battery 100.

[0046] It is understood that the second wall 22 has a similar structure to the first wall 21, and corresponding reinforcements may also be provided to strengthen the structural strength of the peripheral side wall 23 and improve the ability of the peripheral side wall 23 to resist tensile deformation. The following embodiment is described as an embodiment in which the first wall 21 includes the reinforcement 211 and the second wall 22 does not include the reinforcement.

[0047] Continuing with Figures 1 and 2 , the peripheral sidewall 23 includes a top wall 231 and a bottom wall 232 arranged opposite each other along a second direction X, wherein the second direction X is perpendicular to the first direction Z. The top wall 231 defines a through-hole 2311. The electrode 30 is disposed within the through-hole 2311 and is insulated from the housing 20. This allows the housing 20 and the electrode 30 to be electrically connected to the electrode assembly 10 and have opposite polarities. Specifically, one end of the electrode 30 is located within the housing 20 and connected to the electrode assembly 10, while the other end of the electrode 30 protrudes from the top wall 231 through the through-hole 2311.

[0048] In some embodiments, the peripheral sidewall 23 further includes a first sidewall 233 and a second sidewall 234. The first sidewall 233 and the second sidewall 234 are arranged opposite each other along the third direction Y, wherein the first direction Z, the second direction X, and the third direction Y are perpendicular to each other. The reinforcement portion 211 protrudes from at least one of the group consisting of the top wall 231, the bottom wall 232, the first sidewall 233, and the second sidewall 234.

[0049] Referring to FIG. 2 , in some embodiments, the peripheral sidewall 23 includes a sidewall body 23a and a flange 23b. The flange 23b is disposed at one end of the peripheral sidewall 23 adjacent to the first wall 21. A sealed space for accommodating the electrode assembly 10 is formed between the sidewall body 23a, the first wall 21, and the second wall 22. The flange 23b protrudes outward from the end of the sidewall body 23a adjacent to the first wall 21 in a direction perpendicular to the sidewall body 23a. The flange 23b is connected to the first wall 21 on a side surface facing the first wall 21. A reinforcement portion 211 protrudes from the side of the flange 23b away from the sidewall body 23a to strengthen the structural strength of the peripheral sidewall 23 and improve the ability of the peripheral sidewall 23 to resist tensile deformation.

[0050] In some embodiments, the peripheral side wall 23 does not include the flange 23 b , and the end surface of the side wall body 23 a facing the first wall 21 is directly connected to the first wall 21 .

[0051] In some embodiments, the first wall 21 includes a main body 212, and the main body 212 is connected to the peripheral side wall 23. Along the first direction Z, the projection of the main body 212 overlaps with the projection of the second wall 22, and the projection of the outer contour of the main body 212 overlaps with the projection of the peripheral side wall 23. A sealed space for accommodating the electrode assembly 10 is formed between the main body 212, the second wall 22 and the peripheral side wall 23. The reinforcement portion 211 is connected to the main body 212 and is integrally formed with the main body 212 to further strengthen the structural strength of the peripheral side wall 23 and improve the ability of the peripheral side wall 23 to resist tensile deformation. In addition, the integral formation of the reinforcement portion 211 and the main body 212 also facilitates the simplification of the manufacturing process of the reinforcement portion 211 and reduces production costs.

[0052] Referring also to FIG. 3 , in some embodiments, the reinforcement portion 211 is bent toward the peripheral sidewall 23 to reduce space wasted by the reinforcement portion 211 protruding from the peripheral sidewall 23, thereby increasing the energy density of the battery 100 and further strengthening the structural strength of the peripheral sidewall 23 and improving the ability of the peripheral sidewall 23 to resist tensile deformation. Optionally, the reinforcement portion 211 is connected to the main body portion 212 and extends along the first direction Z.

[0053] In some embodiments, the projection of the main body 212 along the first direction Z is rectangular. The main body 212 includes four sides. Optionally, a reinforcement portion 211 is provided on any one side of the main body 212, or two opposite sides of the main body 212 are respectively provided with reinforcement portions 211, or two adjacent sides of the main body 212 are respectively provided with reinforcement portions 211, or any three sides of the main body 212 are respectively provided with reinforcement portions 211, or all four sides of the main body 212 are respectively provided with reinforcement portions 211.

[0054] The reinforcement portion 211 is rectangular and includes a first side 211a, a second side 211b, and a third side 211c. The first side 211a is spaced apart from the main body 212, while the second side 211b and the third side 211c are connected between the first side 211a and the main body 212 and are disposed opposite each other. The first side 211a extends parallel to the side of the main body 212 where the reinforcement portion 211 is located, ensuring balanced structural strength across the reinforcement portion 211.

[0055] Please refer to Figure 4. It can be understood that in other embodiments, along the first direction Z, the projection of the main body 212 is circular, and correspondingly, the peripheral side wall 23 is circular, and the extension direction of the first edge 211a is parallel to the extension direction of the side of the main body 212 where the reinforcement portion 211 is located, so that the structural strength of each part of the reinforcement portion 211 is balanced.

[0056] It is understandable that in other embodiments, along the first direction Z, the projection of the main body 212 can also be a triangle, a polygon, an irregular shape, etc.; the reinforcement portion 211 can also be a trapezoid, a semicircle, a triangle, etc.

[0057] Referring again to Figures 1 and 2, in some embodiments, the length of the top wall 231 or bottom wall 232 in the third direction Y is greater than the length of the first side wall 233 or second side wall 234 in the second direction X. The length of the side of the main body 212 connected to the top wall 231 or bottom wall 232 is greater than the length of the side of the main body 212 connected to the first side wall 233 or second side wall 234. When the battery expands, the side of the main body 212 connected to the top wall 231 or bottom wall 232 is more likely to form a stress concentration point, causing bending. The reinforcement portion 211 protrudes from the top wall 231 or bottom wall 232, allowing the reinforcement portion 211 to connect to the longer side of the main body 212 to correspond to the stress concentration point of the main body 212. This further reduces the risk of creases forming at the edge of the first wall 21 and causing the corresponding top wall 231 or bottom wall 232 to collapse, thereby improving the safety performance of the battery 100.

[0058] Continuing with FIG. 2 , in some embodiments, the electrode assembly 10 has a wound structure, with the winding axis of the wound structure oriented in the same direction as the second direction X. The electrode assembly 10 includes a top surface 11 and a bottom surface 12. A straight section 13 and a curved section 14 are located between the top and bottom surfaces 11 and 12. The top and bottom surfaces 11 and 12 are positioned opposite each other along the second direction X, with the top surface 11 proximate the top wall 231 and the bottom surface 12 proximate the bottom wall 232. The two curved sections 14 are respectively proximate the first and second side walls 233 and 234. The curved sections 14 have greater structural strength than the top and bottom surfaces 11 and 12. When the battery expands, the curved sections 14 provide support for the first and second side walls 233 and 234, further concentrating stress on the top and bottom walls 231 and 232. Collapse of the top and bottom walls 231 and 232 can easily compress the top and bottom surfaces 11 and 12, potentially causing a short circuit. The reinforcement portion 211 protrudes from the top wall 231 or the bottom wall 232 , which can reduce the risk of creases at the edge of the first wall 21 and collapse of the corresponding top wall 231 or bottom wall 232 , thereby improving the safety performance of the battery 100 .

[0059] Referring to FIG. 5 , in some embodiments, the reinforcement portion 211 includes a plurality of sub-portions 2111 spaced apart along the third direction Y, so as to disperse the force on the reinforcement portion 211 and improve the structural strength of the reinforcement portion 211 .

[0060] Optionally, the plurality of sub-portions 2111 are arranged at equal intervals along the third direction Y so that each sub-portion 2111 is subjected to uniform force.

[0061] It is understandable that in other embodiments, when the reinforcing portion 211 protrudes from the first side wall 233 and the second side wall 234, the reinforcing portion 211 includes a plurality of sub-portions 2111 spaced apart along the second direction X, so as to disperse the force on the reinforcing portion 211 and improve the structural strength of the reinforcing portion 211.

[0062] Referring to FIG6 , in some embodiments, the battery 100 further includes a circuit board assembly 40, which is located on one side of the top wall 231. The top wall 231 and the circuit board assembly 40 can be connected and fixed by adhesive. Supported by the circuit board assembly 40, the top wall 231 has a higher structural strength than the bottom wall 232. When the battery expands, the side of the main body 212 connected to the bottom wall 232 is likely to pull on the bottom wall 232, causing deformation. This makes the side of the main body 212 connected to the bottom wall 232 more likely to form a stress concentration point, resulting in bending. The reinforcement portion 211 protrudes from the bottom wall 232, which can reduce the risk of creases forming at the edge of the first wall 21 and causing the bottom wall 232 to collapse, thereby improving the safety performance of the battery 100.

[0063] Referring to Figure 7 , in some embodiments, taking the example of a reinforcement portion 211 protruding from the bottom wall 232, along the third direction Y, the relationship between the length I1 of the reinforcement portion 211 and the length L1 of the bottom wall 232 satisfies the following: I1 ≥ 10% L1. The length I1 of the reinforcement portion 211 is the length of the side edge where the reinforcement portion 211 connects to the main body portion 212, while the length L1 of the bottom wall 232 is the length of the side edge where the main body portion 212 connects to the bottom wall 232. By controlling I1 ≥ 10% L1, the reinforcement portion 211 can better suppress creases at the edge of the first wall 21 during battery expansion, reducing strain on the bottom wall 232. It also provides better support for the bottom wall 232, strengthening its structural strength and improving its resistance to strain and deformation. This, in turn, reduces the risk of collapse of the bottom wall 232, thereby enhancing battery safety. This same range is also met when the reinforcement portion 211 protrudes from the top wall 231.

[0064] Optionally, I1 can be 10% L1, 15% L1, 20% L1, 25% L1, 30% L1, 35% L1, 40% L1, 45% L1, 50% L1, 55% L1, 60% L1, 65% L1, 70% L1, 75% L1, 80% L1, 85% L1, 90% L1, 95% L1, 100% L1 or a range consisting of any two of the above values.

[0065] It should be noted that, when the reinforcement portion 211 includes a plurality of sub-portions 2111 spaced apart along the third direction Y, the length I1 of the reinforcement portion 211 is the distance between the two outermost sub-portions 2111 on opposite sides thereof.

[0066] Referring to Figures 7 and 8 , in some embodiments, the protruding width W1 of the reinforcement portion 211 along its protruding direction satisfies the following requirement: W1 ≥ 0.1 mm. By ensuring that W1 ≥ 0.1 mm, the structural strength of the reinforcement portion 211 can be improved, effectively preventing the collapse of the peripheral sidewall 23. It should be noted that when the reinforcement portion 211 is in a trapezoidal, semicircular, or triangular shape, the portion meeting the above range is the effective portion of the reinforcement portion 211.

[0067] Specifically, when viewed along the third direction Y, the reinforcement portion 211 can be divided into a first portion 211d extending in the second direction X, close to the main portion 212, and away from the main portion 212, and a bent second portion 211e. The relationship between the extension length w1 of the first portion 211d, the width w2 of the second portion 211e, and the protruding width W1 satisfies the following equation: W1 = w1 + w2. When w2 = 0, the reinforcement portion 211 is not bent.

[0068] Optionally, W1 may be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, or any other value within a range of ≥0.1 mm.

[0069] In some embodiments, the protruding width of the reinforcing portion 211 is less than or equal to the width of the bottom wall 232 in the first direction Z, so that after the reinforcing portion 211 is bent toward the bottom wall 232, along the second direction X, the end of the reinforcing portion 211 away from the main body portion 212 is located within the projection range of the bottom wall 232, thereby reducing the space waste caused by the protrusion of the reinforcing portion 211 beyond the second wall 22 after the bending, thereby improving the energy density of the battery 100.

[0070] Continuing with FIG. 7 , in some embodiments, taking the reinforcement portion 211 protruding from the bottom wall 232 as an example, along the third direction Y, the relationship between the distance m1 between the end of the reinforcement portion 211 proximate the first side wall 233 and the first side wall 233, and the distance m2 between the end of the reinforcement portion 211 proximate the second side wall 234 and the second side wall 234 satisfies the following conditions: 0 ≤ m1 ≤ 43% L1, 0 ≤ m2 ≤ 43% L1. The center of the side where the main portion 212 of the first wall 21 connects to the bottom wall 232 is prone to creases, which in turn causes the center of the bottom wall 232 to collapse. By controlling the values ​​of 0 ≤ m1 ≤ 43% L1 and 0 ≤ m2 ≤ 43% L1, the reinforcement portion 211 can reinforce the center where the main portion 212 of the first wall 21 connects to the bottom wall 232, which is prone to creases. This effectively prevents creases at the edge of the first wall 21 and collapses the bottom wall 232, thereby improving battery safety. When the reinforcement portion 211 protrudes beyond the top wall 231 , the above range is also met.

[0071] Optionally, m1 can be selected from 0, 5% L1, 10% L1, 15% L1, 20% L1, 25% L1, 30% L1, 35% L1, 40% L1, 41% L1, 42% L1, 43% L1 or a range consisting of any two of the above values; m2 can be selected from 0, 5% L1, 10% L1, 15% L1, 20% L1, 25% L1, 30% L1, 35% L1, 40% L1, 41% L1, 42% L1, 43% L1 or a range consisting of any two of the above values.

[0072] In some embodiments, m1=m2, and the position of the reinforcing portion 211 corresponds to the position where the first wall is prone to creases, so that the reinforcing portion 211 is evenly stressed. Please refer to Figure 9. In some embodiments, the electrode assembly 10 is a laminated structure, and the stacking direction of the laminated structure is the same as the first direction Z, and the circumferential sides of the electrode assembly 10 are prone to bending. There are two reinforcing portions 211, one of which protrudes from the top wall 231 or the bottom wall 232, and the other protrudes from the first side wall 233 or the second side wall 234. The size and positional relationship of the reinforcing portion 211 protruding from the top wall 231 or the bottom wall 232 are the same as those in the above embodiment. The size and positional relationship of the reinforcing portion 211 protruding from the first side wall 233 or the second side wall 234 are similar to those in the above embodiment, as follows:

[0073] Taking the reinforcement portion 211 protruding from the second sidewall 234 as an example, along the second direction X, the relationship between the length I2 of the reinforcement portion 211 and the length L2 of the second sidewall 234 satisfies the following: I2 ≥ 10% L2. The length I2 of the reinforcement portion 211 is the length of the side where the reinforcement portion 211 connects to the main body portion 212, while the length L2 of the second sidewall 234 is the length of the side where the main body portion 212 connects to the second sidewall 234. By controlling I2 ≥ 10% L2, the reinforcement portion 211 can better suppress creases at the edge of the first wall 21 during battery expansion, reducing strain on the second sidewall 234. It also provides better support for the second sidewall 234, strengthening its structural strength and improving its resistance to strain and deformation. This, in turn, reduces the risk of collapse and enhances battery safety. This also applies when the reinforcement portion 211 protrudes from the first sidewall 233.

[0074] Along the protruding direction of the reinforcement portion 211, the protruding width W2 of the reinforcement portion 211 satisfies the following: W2 ≥ 0.1 mm. Specifically, along the protruding direction of the reinforcement portion 211, the reinforcement portion 211 can be divided into a first portion 211d extending along the third direction Y, close to the main portion 212, and a second portion 211e extending away from the main portion 212 and bent. The relationship between the extension length w3 of the first portion 211d, the extension length w4 of the second portion 211e, and the protruding width W2 satisfies the following: W2 = w3 + w4. When w4 = 0, it indicates that the reinforcement portion 211 is not bent.

[0075] Taking the reinforcement portion 211 protruding from the second side wall 234 as an example, along the second direction X, the third spacing m3 between the end of the reinforcement portion 211 facing the top wall 231 and the top wall 231, and the fourth spacing m4 between the end of the reinforcement portion 211 facing the bottom wall 232 and the bottom wall 232 satisfy the following conditions: 0 ≤ m3 ≤ 43% L2, 0 ≤ m4 ≤ 43% L2. By controlling the values ​​of 0 ≤ m3 ≤ 43% L2 and 0 ≤ m4 ≤ 43% L2, the reinforcement portion 211 can reinforce the center of the connection between the main portion 212 of the first wall 21 and the second side wall 234, which is prone to creases. This effectively prevents creases at the edges of the first wall 21 and collapse of the second side wall 234, thereby improving battery safety. This also applies when the reinforcement portion 211 protrudes from the first side wall 233.

[0076] In some embodiments, m3=m4, and the position of the reinforcing portion 211 corresponds to the position where the first wall is prone to creases, so that the reinforcing portion 211 is subjected to uniform force.

[0077] The present application is described below through specific implementation methods:

[0078] The batteries of each comparative example and each embodiment were subjected to a hot box test. The batteries were first allowed to stand at room temperature, then placed in a hot box. The hot box was heated to 130°C±2°C at a heating rate of 5°C±2°C and maintained at a constant temperature of 130°C±2°C for 1 hour. At the end of the test, the battery shell was observed to see whether creases or collapse occurred.

[0079] Table 1 provides comparative example 1 and examples 1 to 8. The battery used in this table has a thickness of 4.5 mm and employs a wound electrode assembly, with the winding axis oriented in the direction relative to the bottom wall 232 and the top wall 231. L1 in the table corresponds to the length of the bottom wall 232 of the battery. A circuit board assembly 40 is welded to one side of the top wall 231. The wound electrode assembly is formed by sequentially stacking and winding a positive electrode sheet, a separator, and a negative electrode sheet, wherein the separator is disposed between the positive and negative electrode sheets. The battery in comparative example 1 is not provided with a reinforcing portion 211, while the batteries in examples 1 to 8 are all provided with a reinforcing portion 211, which protrudes from the bottom wall 232 (see FIG. 7 ). It should be noted that the reinforcing portion 211 of the battery in examples 4 to 5 includes a plurality of subsections 2111, each of which is arranged at equal intervals along the third direction Y. The length I1 of the reinforcing portion 211 is the distance between the two outermost subsections 2111 on opposite sides in the third direction Y. In Example 4, the length of each section is 4 mm, and the spacing between sections is 1 mm; in Example 5, the length of each section is 6 mm, and the spacing between sections is 1 mm.

[0080] The other parameters except those involved in the embodiments and comparative examples in Table 1 are the same.

[0081] Table 1 Other parameters and test results of each battery in Comparative Example 1 and Examples 1 to 8:

[0082] As can be seen from Table 1, the reinforcement portion 211 can reduce the risk of creases being generated at the edge of the first wall 21 and causing the bottom wall 232 to collapse when the battery expands, thereby improving the safety performance of the battery 100.

[0083] Table 2 provides Comparative Example 2 and Example 9. The batteries used in this table have a thickness of 4.3 mm and employ a laminated electrode assembly formed by alternately stacking positive electrode sheets, separators, and negative electrode sheets, wherein the separators are disposed between the positive and negative electrode sheets. The corresponding lengths of the top wall 231 and bottom wall 232 are L1, and the corresponding lengths of the first side wall 233 and second side wall 234 are L2. The battery in Comparative Example 2 is not provided with a reinforcing portion 211, while the battery in Example 9 is provided with four reinforcing portions 211, one of which protrudes from the top wall 231, one from the bottom wall 232, one from the first side wall 233, and another from the second side wall 234. Figure 9 takes the reinforcement portion 211 protruding from the bottom wall 232 and the second side wall 234 as an example. The situation where the reinforcement portion 211 protrudes from the top wall 231 is the same as the situation where the reinforcement portion 211 protrudes from the bottom wall 232, and the situation where the reinforcement portion 211 protrudes from the first side wall 233 is the same as the situation where the reinforcement portion 211 protrudes from the second side wall 234.

[0084] The other parameters except those involved in the embodiments and comparative examples in Table 2 are the same.

[0085] Table 2 Other parameters and test results of each battery in Comparative Example 2 and Example 9:

[0086] As shown in Table 2, the reinforcement portion 211 can reduce the risk of creases at the edge of the first wall 21 causing collapse of the top wall 231 , bottom wall 232 , first side wall 233 and second side wall 234 when the battery expands, thereby improving the safety performance of the battery 100 .

[0087] 10 , an embodiment of the present application further provides an electric device 200, which includes any one of the batteries 100 described above. The electric device 200 may be, but is not limited to, an electronic device such as a mobile phone, a tablet computer, or a drone.

[0088] In summary, in the above-mentioned battery 100 and electrical equipment 200, the reinforcing portion 211 protrudes from the peripheral side wall 23. When the battery expands, the reinforcing portion 211 can suppress the formation of creases at the edge of the first wall 21, reduce the pulling on the peripheral side wall 23, and at the same time form support for the peripheral side wall 23, strengthen the structural strength of the peripheral side wall 23, and improve the ability of the peripheral side wall 23 to resist pulling deformation, thereby reducing the risk of collapse of the peripheral side wall 23 and improving the safety performance of the battery 100.

[0089] In addition, those skilled in the art may also make other changes within the spirit of this application. Of course, these changes made according to the spirit of this application should be included in the scope disclosed in this application.

Claims

1. A battery, comprising an electrode assembly, a shell and a pole, wherein the electrode assembly is accommodated in the shell, characterized in that: The housing comprises a first wall and a second wall arranged opposite to each other along a first direction, and a peripheral side wall arranged between the first wall and the second wall, wherein the first direction is a thickness direction of the battery; The first wall includes a reinforcement portion, and the reinforcement portion protrudes out of the peripheral side wall; The peripheral side wall includes a top wall and a bottom wall that are arranged opposite to each other along the second direction. The top wall is provided with a through hole, and the pole is arranged in the through hole.

2. The battery according to claim 1, characterized in that The battery satisfies at least one of the following: a. The first wall and the peripheral side wall are connected by welding; b. The shell contains metal elements, and the metal elements include at least one of Mg, Al, Zn, Fe, Sn, Cu, Ag, Pt, Au, and Mn.

3. The battery according to claim 1, characterized in that The peripheral side wall includes a side wall body and a flange. The flange is arranged at one end of the peripheral side wall adjacent to the first wall. One side surface of the flange is connected to the first wall. The reinforcement portion protrudes out of a side of the flange away from the side wall body.

4. The battery according to claim 1, characterized in that The battery satisfies at least one of the following: c. The reinforcement portion is bent toward the peripheral side wall; d. The first wall includes a main body portion, the main body portion is connected to the peripheral side wall, and the main body portion and the reinforcement portion are integrally formed.

5. The battery according to claim 1, characterized in that The peripheral side wall further includes a first side wall and a second side wall arranged opposite to each other along a third direction, the first direction, the second direction and the third direction are perpendicular to each other, and the reinforcing portion protrudes from at least one of the group consisting of the top wall, the bottom wall, the first side wall and the second side wall.

6. The battery according to claim 5, characterized in that The electrode assembly satisfies at least one of the following: e. The length of the top wall or the bottom wall in the third direction is greater than the length of the first side wall or the second side wall in the second direction, and the reinforcement portion protrudes from the top wall or the bottom wall; f. The electrode assembly is a winding structure, the winding axis direction of the winding structure is the same as the second direction, and the reinforcement portion protrudes out of the top wall or the bottom wall.

7. The battery according to claim 5, characterized in that The reinforcing portion includes a plurality of sub-portions spaced apart along the second direction or the third direction.

8. The battery according to claim 5, characterized in that The battery further comprises a circuit board assembly, wherein the circuit board assembly is located at one side of the top wall, and the reinforcing portion protrudes out of the bottom wall.

9. The battery according to claim 5, characterized in that The battery satisfies at least one of the following: g. The reinforcing portion protrudes from the top wall or the bottom wall, and along the third direction, the relationship between the length I1 of the reinforcing portion and the length L1 of the top wall or the bottom wall satisfies: I1 ≥ 10% L1; h. The reinforcing portion protrudes from the first side wall or the second side wall, and along the second direction, the relationship between the length I2 of the reinforcing portion and the length L2 of the first side wall or the second side wall satisfies: I2 ≥ 10% L2.

10. The battery according to claim 5, characterized in that Along the protruding direction of the reinforcement portion, the protruding width W1 of the reinforcement portion satisfies: W1 ≥ 0.1 mm.

11. The battery according to claim 5, characterized in that The battery satisfies at least one of the following: i. the reinforcing portion protrudes from the top wall or the bottom wall, and along the third direction, the relationship between the length L1 of the top wall or the bottom wall, the distance m1 between the end of the reinforcing portion close to the first side wall and the first side wall, and the distance m2 between the end of the reinforcing portion close to the second side wall and the second side wall satisfies: 0≤m1≤43%L1, 0≤m2≤43%L1; j. The reinforcing portion protrudes out of the first side wall or the second side wall, and along the second direction, the length L2 of the first side wall or the second side wall, the distance m3 between one end of the reinforcing portion facing the top wall and the top wall, and the distance m4 between one end of the reinforcing portion facing the bottom wall and the bottom wall satisfy: 0≤m3≤43%L2, 0≤m4≤43%L2.

12. An electrical equipment, characterized in that: The electrical device comprises the battery according to any one of claims 1 to 11.

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