Batteries, battery packs and electrical devices

Abstract

This invention relates to the field of battery technology, and discloses a battery, a battery pack, and an electrical device. The battery includes: a casing, including a first wall, the first wall having a first electrode terminal; a cell, including a body and tabs, the tabs including a first tab and a second tab; the casing also includes a second wall, adjacent to the first wall, and the second wall supports the cell in a second direction; the first tab is disposed away from the second wall relative to the second tab; the first tab is welded to the first electrode terminal to form a first solder mark; wherein, along the first direction, the dimension of the body is L mm, and along the second direction, the dimension of the body is H mm, L / H satisfying: 1.5 ≤ L / H ≤ 5; the weight of the battery is G kg, satisfying 8 kg ≤ G kg ≤ 15 kg; along the second direction, the distance h mm between the first solder mark and the side of the body opposite to the second wall ranges from 7 to 40 mm. This invention can reduce tab tearing and ensure reliable electrical connections.

Description

Technical Field

[0001] This invention relates to the field of battery technology, specifically to batteries, battery packs, and electrical devices. Background Technology

[0002] To improve battery energy density, current methods involve making the battery cells longer, with the tabs extending along one end of the cell's height and welded to the electrode terminals. During battery use, vibrations can cause the tabs to break due to vertical tearing forces, resulting in a reduction in the effective connection area and decreased current carrying capacity. Summary of the Invention

[0003] This invention provides a battery, a battery pack, and an electrical device to solve the problem that the tabs break when subjected to vertical tearing forces, resulting in a reduction in the effective connection area and a decrease in current carrying capacity.

[0004] In a first aspect, the present invention provides a housing, including a first wall having a first electrode terminal; and a battery cell disposed within the housing, the battery cell including a body portion and tabs extending along one side of the body portion, the tabs extending in a first direction, the tabs being disposed opposite to the first wall in the first direction, the tabs including a first tab and a second tab with opposite polarities, the first tab and the second tab being spaced apart and insulated, the arrangement direction of the first tab and the second tab being a second direction perpendicular to the first direction, the housing further including a second wall adjacent to the first wall, the second wall being used to support the battery cell in the second direction, and in the second direction, the first tab being disposed further away from the second wall than the second tab, the first tab being welded to the first electrode terminal to form a first solder mark; wherein, along the first direction, the size of the body portion is L mm, and along the second direction, the size of the body portion is H mm, L / H satisfying: 1.5≤L / H≤5; The weight of the battery is Gkg, which satisfies 8kg≤Gkg≤15kg; and along the second direction, the distance hmm between the first solder mark and the side of the body part away from the second wall ranges from 7 to 40mm.

[0005] Beneficial effects: By controlling the ratio of cell length L to height H to 1.5 ≤ L / H ≤ 5 and the battery weight G to 8 kg ≤ G ≤ 15 kg, the shaking amplitude of the cell under vibration can be reduced, and the tensile force on the tabs can be reduced. At the same time, by controlling the distance h1 between the first solder mark and the side of the cell away from the support wall to 7 mm to 40 mm, the welding position is both far away from the edge of the cell where the stress is concentrated, reducing the risk of tearing, and retaining sufficient effective area of ​​the tabs and welding space to ensure the current carrying capacity.

[0006] In a second aspect, the present invention also provides a battery pack, including a base plate and a battery as described in the first aspect, the battery being placed on the base plate, the base plate being used to support a second wall of the battery housing in a second direction, the base plate being parallel to the first direction.

[0007] Thirdly, the present invention also provides an electrical device, including a battery as described in the first aspect or a battery pack as described in the second aspect.

[0008] Beneficial effects: By mounting the above-mentioned battery pack on the electrical device, the stability of the electrical device can be improved. Attached Figure Description

[0009] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0010] Figure 1 This is a perspective view of a battery according to an embodiment of the present invention; Figure 2 This is an exploded view of the battery according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the battery cell structure according to an embodiment of the present invention; Figure 4 This is a schematic cross-sectional view of the battery according to an embodiment of the present invention; Figure 5 for Figure 4 Enlarged view of part A in the middle; Figure 6 for Figure 4 Enlarged view of part B in the middle; Figure 7 This is a simplified cross-sectional view of a battery according to another embodiment of the present invention.

[0011] Explanation of reference numerals in the attached figures: 10-Shell; 101-Shell body; 11-First wall; 12-Third wall; 13-Second wall; 20 - Battery cell; 21 - Body; 22 - First tab; 221 - First solder mark; 23 - Second tab; 231 - Second solder mark; 201 - First side; 202 - Second side; 31 - First electrode terminal; 32 - Second electrode terminal; 40 - Spacer block; 40a - Exhaust passage; 50 - Pressure relief mechanism; 60 - Insulating element; 61 - Protrusion; X - First direction; Y - Third direction; Z - Second direction. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0013] In battery design, to improve energy density, the cell length can be extended, with tabs extended from both sides along the cell's length and welded to the terminal assembly. This reduces the overall vibration amplitude of the battery, thereby reducing the tearing force on the tabs in the vertical direction and preventing tab breakage. However, this arrangement reduces the overall volumetric energy density of the battery. Therefore, to improve the volumetric energy density and save internal space, tabs are usually extended from the same end along the length, reducing space occupation and increasing battery energy density. However, in vibrating environments, such as road bumps during vehicle operation or shaking during equipment movement, the cell experiences significant vertical displacement. Due to the large length of the cell, the vibration difference between the two ends is significant, with the vibration amplitude on the side farther from the tabs being much greater than that on the side closer to the tabs. This inconsistent vibration amplitude is transmitted through the cell body to the tabs, subjecting them to repeated tensile forces, ultimately leading to tearing or breakage of the weld between the tabs and the electrode terminals. Once the tab breaks, the effective electrical connection area of ​​the battery is greatly reduced, the overcurrent capacity is significantly reduced, and the charging and discharging performance of the battery is seriously damaged.

[0014] Research has shown that the closer the tab-to-terminal welding point is to the top surface of the battery cell along its height, the greater the displacement, tensile force, and tearing risk during vibration. If the distance between the tab-to-terminal welding point and the top surface of the battery cell is too large, it will encroach on the effective width and welding area of ​​the tab, reducing current carrying capacity; if the distance is too small, the tab is prone to shaking and tearing at the welding point during vibration. Therefore, precisely controlling the distance between the tab-to-terminal welding point and the top surface of the battery cell to balance current carrying capacity and resist tearing energy has become a pressing technical problem to be solved.

[0015] For this, please refer to the following: Figures 1 to 7This invention provides a battery, a housing 10) including a first wall 11 with a first electrode terminal 31; a battery cell 20 disposed within the housing 10, the battery cell 20 including a body portion 21 and tabs extending along one side of the body portion 21, the tabs extending in a first direction X, the tabs being opposite to the first wall 11 in the first direction X, the tabs including a first tab 22 and a second tab 23 of opposite polarity, the first tab 22 and the second tab 23 being insulated from each other, the first tab 22 and the second tab 23 being arranged in a second direction Z, the second direction Z being perpendicular to the first direction X; the housing 10 also includes... The device includes a second wall 13, which is adjacent to the first wall 11 and is used to support the battery cell 20 in the second direction Z. In the second direction Z, the first electrode tab 22 is located away from the second wall 13 relative to the second electrode tab 23. The first electrode tab 22 is welded to the first electrode terminal 31 to form a first solder mark 221. The size of the body part is L mm in the first direction X and H mm in the second direction Z. The L / H ratio satisfies: 1.5 ≤ L / H ≤ 5. For example, it can be any one of 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5 or a range between any two of them.

[0016] The weight of the battery is Gkg, which satisfies 8kg≤Gkg≤15kg; for example, it can be any one of 8kg, 9kg, 10kg, 11kg, 12kg, 13kg, 14kg, 15kg or any two of these values.

[0017] Along the second direction Z, the distance h1mm between the first solder mark 221 and the first side 201 of the body portion 21 facing away from the second wall 13 ranges from 7 to 40 mm. For example, h1mm can be any one of 7 mm, 10 mm, 20 mm, 30 mm, 40 mm, or any value between two of them.

[0018] In this embodiment of the invention, the first direction X can be the length direction of the battery, the second direction Z can be the height direction of the battery, and the third direction Y can be the width direction of the battery.

[0019] The housing 10 is a component used to provide a receiving space to house the battery cell 20 and other components and isolate them from the outside environment. The housing 10 generally includes a housing body 101 with an opening at at least one end and a receiving cavity. The opening of the housing body 101 can be closed by a cover plate to seal and isolate the internal environment of the battery cell 20 from the external environment.

[0020] The casing 10 can also contain an electrolyte. The electrolyte is typically a liquid electrolyte used to transport active ions. It is a liquid material that conducts ions while isolating electrons. The electrolyte consists of solvents, electrolyte salts, additives, and other chemical substances; the solvent can be carbonates, carboxylic acid esters, or ethers; the electrolyte salt can be lithium salts, sodium salts, or zinc salts; the additives can be vinylene carbonate, fluoroethylene carbonate, propylene sulfite, vinyl sulfite, etc.

[0021] The first wall 11 can be a wall of the shell 10 located on the X side in the first direction. The first wall 11 can be integrally formed with the shell body 101 or it can be a separate structural component. When the first wall 11 and the shell body 101 are separate structural components, the first wall 11 is a cover plate and can be welded to an opening on one side of the shell body 101. The first wall 11 can be perpendicular to the second wall 13.

[0022] The material of the casing 10 includes, but is not limited to, metals or alloys such as copper, iron, aluminum, stainless steel, aluminum alloy, titanium, and magnesium, as well as aluminum-plastic film.

[0023] Electrode terminals are components that electrically connect the battery to an external circuit. Electrode terminals are typically connected to the tabs of the cell 20 via welding or bonding to enable current input and output. For example, electrode terminals can be terminal assemblies, which electrically connect the cell 20 (electrode assembly) located inside the housing 10 to external devices (adjacent batteries or other electrical equipment) located outside the housing 10. The battery can discharge to external devices through the output terminals (tabs) of the cell 20 and the output terminals (terminal assemblies) of the external devices, and an external power source can charge the battery through the terminal assemblies and tabs. The terminal assemblies can be directly electrically connected to the tabs of the cell 20, or they can be electrically connected to the tabs via metal adapters.

[0024] The electrode assembly includes, but is not limited to, metals such as copper, aluminum, aluminum alloy, and copper-aluminum alloy. The electrode terminals can be insulated from the first wall 11, for example, by providing an insulating plastic component between them.

[0025] The battery cell 20 is the component in the battery where electrochemical reactions occur; it is the smallest unit in the battery capable of electrochemical reactions such as charging and discharging. The battery cell 20 is the basic unit of the battery, and its body 21 typically includes a positive electrode, a negative electrode, and a separator. The lithium-ion battery cell 20 primarily operates by the insertion and extraction of lithium ions between the positive and negative electrodes. During battery charging, active ions (such as Li) from the positive electrode are inserted into the negative electrode, while electrons from the positive electrode are transferred to the negative electrode through an external circuit, maintaining charge balance. During discharging, active ions (such as Li) previously inserted into the negative electrode can be extracted, while electrons from the negative electrode are transferred to the positive electrode through an external circuit, maintaining charge balance and achieving energy storage and release.

[0026] The battery cell 20 can be either a wound cell or a stacked cell. A wound cell is generally made by winding consecutive positive electrode plates, negative electrode plates, and separators, with the separator located between adjacent positive and negative electrode plates. A stacked cell is generally made by sequentially stacking positive electrode plates, separators, and negative electrode plates.

[0027] In the cylindrical cell 20, the thin film structure of the three-layer material is wound into a cylindrical electrode assembly, while in the cuboid cell 20, the thin film structure is wound or stacked into an electrode assembly with a roughly cuboid shape.

[0028] The length L of the cell 20 is between 300-800mm, for example, it can be any value or a range between 300mm, 400mm, 500mm, 600mm, 700mm, and 800mm. The longer the cell 20 is, the greater the shaking when subjected to vibration, and the more likely the tabs are to tear. Controlling the length of the cell 20 within a suitable range can reduce the amplitude of cell shaking while ensuring the energy density requirements.

[0029] The tab is a lead-out structure extending from the body 21 of the battery cell 20, used to lead the current inside the battery cell 20 to the external electrode terminals. The tab is typically made of metal foil and is connected to the current collector of the battery cell 20. The tab can be integrally formed with the current collector or it can be a separate structural component. The tab can be directly welded to the electrode terminals or welded via an adapter (such as an adapter plate). Various welding methods are possible; for example, spot welding can be used, fusing the tab to the electrode terminals through localized heating and pressure; laser welding can be used, utilizing a high-energy laser beam; or ultrasonic welding can be used, achieving connection through heat generated by high-frequency mechanical vibration. The tab is made of a highly conductive metallic material (such as copper, aluminum, or nickel).

[0030] The electrode can be a positive electrode or a negative electrode.

[0031] The spacing distance h1 refers to the vertical distance along the second direction Z between the edge of the first solder mark 221 near the first side 201 of the cell 20 and the first side 201 of the cell 20. The cell 20 has a first side 201 and a second side 202 opposite to each other along the second direction Z, with the second side 202 facing downward and supported by the housing 10, and the first side 201 facing upward.

[0032] If the distance h1 is too large, it will encroach on the dimensions of the first tab 22 and the first solder mark 221, reducing the current carrying capacity; if the distance h1 is too small, the first tab 22 and the first solder mark 221 will be more easily pulled when the cell 20 shakes, thus increasing the risk of tearing. Therefore, by controlling the distance h1, the current carrying capacity and tear resistance of the tab can be effectively balanced.

[0033] By setting the ratio of the length L to the height H of the cell body 21 to 1.5 ≤ L / H ≤ 5 and controlling the battery weight G to 8 kg ≤ G ≤ 15 kg, the shaking amplitude of the cell under vibration conditions can be effectively reduced, the reciprocating pulling force transmitted from the cell shaking to the electrode tab can be reduced, and the risk of the first solder mark 211 being torn can be reduced.

[0034] Hmm can range from 120 to 200 mm. For example, it can be any one of 120 mm, 130 mm, 140 mm, 150 mm, 160 mm, 170 mm, 180 mm, 190 mm, or 200 mm, or any two of them.

[0035] The range of Lmm can be 300~800mm. For example, it can be any one of 300mm, 400mm, 500mm, 600mm, 700mm, 8000mm or any two of them.

[0036] In some embodiments, the ratio of the projected area of ​​the first solder mark 221 on the first wall 11 to the projected area of ​​the first tab 22 on the first wall 11 is in the range of 0.02 to 0.4. For example, it can be any one of 0.02, 0.1, 0.2, 0.3, 0.4 or a range between any two.

[0037] The projected area of ​​the first weld mark 221 on the first wall 11 can be 50-250 mm². 2 For example, it can be 50 mm 2 100mm 2 150 mm 2 200 mm 2 250 mm 2 The range of values ​​between any one or any two of them.

[0038] The projected area of ​​the first solder mark 221 onto the first wall 11 is the effective welding area between the tab and the electrode terminal 31.

[0039] When the projected area of ​​the first solder mark 221 is controlled within an appropriate range, it ensures that the solder joint has sufficient connection strength, avoiding the problem of the tab being torn due to vibration caused by insufficient welding strength, thereby ensuring the reliability of the battery. At the same time, a suitable projected area of ​​the first solder mark 221 also ensures good electrical contact performance between the tab and the electrode terminal, reduces resistance, and ensures overcurrent energy.

[0040] In some embodiments, the first solder mark 221 is symmetrically arranged along the central axis of the first tab 22 in the second direction Z.

[0041] By symmetrically arranging the first solder mark 221 at the central axis of the first electrode tab, the tensile and shear forces on the first electrode tab 22 under vibration conditions can be evenly distributed along the central axis, avoiding local stress concentration caused by welding position deviation, further reducing the risk of misalignment, tearing, or detachment of the first solder mark 221, ensuring stable connection between the electrode tab and the electrode terminal, and improving welding reliability.

[0042] In some embodiments, the dimension of the first solder mark 221 along the first direction X is smaller than the dimension of the first solder mark 221 along the second direction Z.

[0043] This configuration allows the first solder mark 221 to extend into a long strip structure along the second direction Z, which reduces the effective length of the electrode tab occupied by the welding area in the first direction X, avoiding compression of the electrode tab's deformation buffer space; at the same time, it increases the effective welding width in the second direction Z, improving the welding joint area and connection strength, better resisting the tearing force caused by cell vibration, and further improving the tear resistance of the first solder mark 211 while ensuring the current carrying capacity, thereby improving the battery's reliability in vibration environments.

[0044] In some embodiments, the electrode terminals include a first electrode terminal 31 and a second electrode terminal 32 disposed on the first wall 11. The first electrode terminal 31 and the second electrode terminal 32 are spaced apart and insulated in the second direction Z. The second tab 23 is welded to the second electrode terminal 32 to form a second solder mark 231. In the second direction Z, the distance h2mm between the second solder mark 231 and the second side 202 of the cell 20 near the second wall 13 ranges from 7 to 40 mm. For example, it can be any one of 7 mm, 10 mm, 20 mm, 30 mm, and 40 mm, or a value range between any two.

[0045] The second electrode terminal 32 is another connection component of the battery for connecting to the outside. The second tab 23 and the first tab 22 are led out from the same end of the cell 20. The first tab 22 is the positive tab and the second tab 23 is the negative tab; or the first tab 22 is the negative tab and the second tab 23 is the positive tab. Preferably, the first tab 22 closer to the first side 201 of the cell 20 is the negative tab, for example, made of copper foil.

[0046] The first tab 22 is closer to the first side 201 of the cell 20 than the second tab 23. Therefore, the first tab 22 experiences greater amplitude of shaking when the battery is subjected to vibration or impact, making it more prone to tearing. Consequently, the projected area of ​​the first solder mark 221 on the first wall 11 is larger than that of the second solder mark 231 on the first wall 11. This results in a larger effective welding area between the first tab 22, which is in a relatively higher position and more susceptible to shaking, and the first electrode terminal 31. This significantly enhances the connection strength between the two, thereby improving resistance to solder mark tearing and current carrying capacity.

[0047] By controlling 2 to be between 7mm and 40mm, the welding position of the second tab 23 and the second electrode terminal 32 can avoid the stress concentration area at the edge of the battery cell. During vibration, the tensile and shear stress on the second solder mark 231 is effectively reduced, preventing the second solder mark 231 from tearing or desoldering, and further improving the reliability of the electrical connection.

[0048] In some embodiments, the size of the second solder mark 231 along the first direction X is smaller than the size of the second solder mark 231 along the second direction Z.

[0049] This configuration allows the second solder mark 231 to form an elongated strip structure extending along the second direction Z. This reduces the occupation of the effective buffer space of the second electrode 23 in the electrode lead-out direction (first direction X), while increasing the effective welding width and bonding area in the height direction (second direction Z). This enhances the connection strength between the second electrode 23 and the second electrode terminal 32, better resists the tearing force caused by vibration, and further ensures the tear resistance and overcurrent stability of the second solder mark 231.

[0050] In some embodiments, the second solder mark 231 is symmetrically arranged along the central axis of the second tab 23 in the second direction Z.

[0051] This configuration ensures that the tensile and shear forces on the second electrode 23 are evenly distributed under vibration conditions, avoiding excessive force on one side of the second electrode 23 and local stress concentration due to welding position deviation. This reduces the risk of tearing, incomplete welding, and detachment of the second weld mark 231, and ensures a stable electrical connection between the second electrode 23 and the second electrode terminal 32.

[0052] In some embodiments, the first tab 22 and the second tab 23 are symmetrically arranged with respect to the central axis of the cell 20 along the height direction (second direction Z). The centerline along the second direction Z refers to an imaginary line passing through the center of the cell 20 in the second direction Z and parallel to the first direction X. The first solder mark 221 and the second solder mark 231 are symmetrically arranged with respect to the central axis of the cell 20 along the second direction Z.

[0053] In this way, the forces on the two tabs (first tab 22, second tab 23) and the two solder marks (first solder mark 221, second solder mark 231) of the battery cell can be kept symmetrical during vibration, avoiding the risk of tearing due to excessive force on one side of the tab, while ensuring that the overcurrent capacity of the two tabs is uniform, further improving the electrical connection and charging and discharging stability.

[0054] In some embodiments, the area of ​​the first electrode 22 ranges from 800 to 2100 mm². 2 And / or, the area of ​​the second electrode 23 ranges from 800 to 2100 mm². 2 For example, it can be 800mm.2 900mm 2 1000mm 2 1200mm 2 1500mm 2 2000mm 2 2100mm 2 The range of values ​​between any one or both of these. The area of ​​the tab can be obtained by multiplying the length by the width.

[0055] For example, the length of the first tab 22 refers to the size of the suspended portion between the root extending from the body 21 of the cell 20 and the first solder mark 221. If the length of the first tab 22 is too long, its suspended portion will increase, and when the battery is vibrated, the amplitude of the first tab 22's shaking will increase, resulting in greater pulling at the connection point with the body 21 of the cell 20 or at the solder point with the first electrode terminal 31, which can easily lead to tearing of the first tab 22. If the length of the first tab 22 is too short, it may not provide sufficient soldering area, affecting the connection strength and conductivity between the first tab 22 and the first electrode terminal 31. Therefore, by controlling the length of the first tab 22 within a suitable range, the stability and electrical performance of the first tab 22 can be effectively balanced.

[0056] By varying the area of ​​a single electrode to 800-2100 mm² 2 This ensures that the tabs have a sufficient cross-sectional area to carry the current during operation, avoids overcurrent energy difference due to excessive width, and avoids tearing due to insufficient strength when subjected to vibration, thus ensuring connection reliability.

[0057] In some embodiments, the battery further includes a pad 40 disposed along a second direction Z between a second side 202 of the cell 20 and a second wall 13 of the housing 10, wherein the second side 202 and the first side 201 are disposed opposite each other along the second direction Z. The pad 40 supports the body portion 21 of the cell 20, reduces the internal gap of the housing 10, reduces the vibration amplitude of the cell 20, and reduces the risk of tab tearing.

[0058] Furthermore, along the second direction Z, the dimension of the side of the pad 40 away from the first electrode 22 in the second direction Z is greater than the dimension of the side of the pad 40 near the electrode 22 in the second direction Z, and the end of the pad 40 away from the electrode 22 in the first direction X abuts against the side of the body 21 near the second wall 13.

[0059] The pad 40 is used to support the battery cell 20. The pad 40 can be made of plastic materials such as polypropylene or polycarbonate. It can also be made of rubber materials with good cushioning properties.

[0060] The pad 40 provides support and lift for the "tail" end of the battery cell 20 away from the first tab 22, which can significantly reduce the shaking space of the battery cell 20 inside the housing 10, thereby suppressing the shaking amplitude of the battery cell 20 in the first direction X, thus greatly reducing the pulling force on the first tab 22, and effectively avoiding the risk of tab tearing caused by the shaking of the battery cell 20.

[0061] In some embodiments, the third wall 12 of the housing 10 may be provided with a pressure relief mechanism 50. The third wall 12 is disposed opposite to the first wall 11 in the first direction X. The pad 40 is provided with an exhaust channel 40a communicating with the pressure relief mechanism 50, and the exhaust channel 40a passes through the pad 40 in the first direction X.

[0062] The pressure relief mechanism 50 is used to release gas when the internal pressure of the battery reaches a preset threshold, so as to prevent the battery casing 10 from rupturing or exploding due to excessive internal pressure.

[0063] The pressure relief mechanism 50 can be an explosion-proof valve, which is a component or part that can be actuated to release internal pressure or temperature when the internal pressure or temperature of a battery cell reaches a predetermined threshold.

[0064] During battery use, explosion-proof valves are mainly used to prevent excessive pressure buildup inside the battery, which could cause deformation or explosion, by allowing gas to escape and reducing the internal pressure.

[0065] The materials used for explosion-proof valves are not limited, including but not limited to aluminum, steel, and alloys. The shapes of explosion-proof valves are not limited, such as square, oblong, elliptical, racetrack-shaped, etc. The types of explosion-proof valves are not limited, such as scored explosion-proof valves, which can be formed by stamping or laser etching.

[0066] The exhaust channel 40a is a channel provided inside or on the surface of the pad 40 for gas flow, providing an exhaust path for the gas generated in the second side 202 region of the cell 20 to flow to the pressure relief mechanism 50, ensuring that the gas can be discharged smoothly. The exhaust channel 40a can be a hole provided inside the pad 40 or a groove formed on the surface of the pad 40, forming a gas flow path.

[0067] When gas is generated inside the battery due to abnormal conditions, causing the pressure to rise, the gas can be guided to the pressure relief mechanism 50 through the venting channel 40a inside the pad 40. That is, the pad 40 will not block the gas from flowing to the pressure relief mechanism 50, thereby ensuring that the pressure relief mechanism 50 can open in time to relieve pressure and prevent the battery from exploding.

[0068] An insulating member 60 is provided between the second wall 13 and the main body 21 of the battery cell 20. The insulating member 60 has a protrusion 61 that protrudes towards the battery cell 20. The protrusion 61 can prevent the battery cell 20 from moving towards the explosion-proof valve and blocking the explosion-proof valve due to excessive gas generation on the tab side.

[0069] In some embodiments, the width W of the cell 20 along the third direction Y ranges from 50 to 90 mm. For example, it can be any one of 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, or a range between any two.

[0070] When the width of the battery cell 20 is too large, the cell body will shake more when subjected to external impact or vibration, increasing the risk of tearing of the first tab 22. When the width of the battery cell 20 is too small, it will lead to insufficient battery energy and reduced range. Therefore, the width of the battery cell 20 is 50-90mm, which can reduce the shaking amplitude of the battery cell 20, avoid the risk of tearing of the first tab 22 due to cell shaking, and ensure high energy density to ensure range.

[0071] In some embodiments, the capacity range of the battery cell 20 is 350-800Ah, for example, it can be any one or any two of 350Ah, 400Ah, 500Ah, 600Ah, 700Ah, and 800Ah.

[0072] The capacity of cell 20 refers to the amount of charge it can store and release. For applications requiring high energy output but with limited space, a cell 20 with high energy density but moderate capacity can be selected; for applications requiring long-term power supply, a larger capacity cell 20 may be needed, but in this case, other structural designs are required to limit its vibration. Another possible approach is to rigorously screen and match the capacity of cell 20 during battery system design to ensure that while meeting performance requirements, its mass and size characteristics can form an optimal fit with the internal fixing structure of the battery casing 10, thereby controlling the vibration of cell 20 within an acceptable range and further reducing the risk of tab tearing.

[0073] By controlling the capacity range of the battery cell 20, the overall weight of the battery cell 20 can be effectively controlled. When the capacity of the battery cell 20 is controlled within an appropriate range, the weight and inertial force will be effectively limited, thereby significantly reducing the shaking amplitude of the battery cell 20 when subjected to vibration, avoiding the risk of tearing of the first tab 22, while also ensuring that the battery has a high capacity.

[0074] The present invention also provides a battery pack, including a base plate and the battery described above, the battery being placed on the base plate, the base plate being used to support the second wall 13 of the battery housing 10 in the second direction Z, the base plate being parallel to the first direction X.

[0075] The present invention also provides an electrical device comprising a battery or battery pack according to any of the above embodiments.

[0076] Electrical appliances are any devices or systems that require electrical energy to perform their intended functions. They can be portable electronic products, such as smartphones, tablets, laptops, or wearable devices; electric vehicles, such as electric cars, electric bicycles, or electric scooters; household appliances, such as vacuum cleaners, power tools, or smart home devices; or industrial equipment, such as robots, actuators in automated production lines, etc.

[0077] Battery packs can serve as operating power for electrical devices or as driving power for electrical devices, replacing or partially replacing fuel or natural gas to provide driving power for vehicles.

[0078] A battery pack has multiple batteries, which can be connected in series, parallel, or a combination of both. A combination of both means that multiple battery packs are connected in both series and parallel.

[0079] A battery pack is a closed or semi-closed structure made of materials such as metal and plastic. It is the physical carrier of the battery pack and is designed to meet the safety, reliability and functionality requirements of the battery pack in different usage scenarios.

[0080] The battery pack may include a housing, which provides installation space for the battery pack, BMS, cooling system, electrical connection components, etc., and fixes these components in the housing to ensure that they maintain a relatively stable position during battery pack operation, and to avoid damage to components or loosening of connections due to vibration, impact or other factors.

[0081] The enclosure refers to a closed or semi-closed structure made of materials such as metal and plastic. It is the physical carrier of the battery pack, and its design and manufacturing must meet the safety, reliability and functionality requirements of the battery pack in different usage scenarios.

[0082] The enclosure includes a lower enclosure and an upper enclosure. The lower enclosure includes a bottom plate and side plates that are connected to and surround the bottom plate. The upper enclosure is connected to the side plates and has a cover plate that is opposite to the bottom plate. The upper enclosure and the lower enclosure together enclose a receiving chamber.

[0083] The battery pack casing is generally composed of an upper casing and a lower casing. The lower casing usually has four side panels and a bottom plate. The four side panels can be integrally formed with the bottom plate or they can be processed and formed separately and fixedly connected.

[0084] The housing may include a bottom and a cover, which overlap each other and together define a space for accommodating the battery module.

[0085] The enclosure can be cast from materials such as steel plates and aluminum alloys, or it can be made of lightweight materials, such as glass fiber reinforced composite materials and carbon fiber reinforced composite materials.

[0086] The shape of the box can be cylinder, cuboid, cube, etc.

[0087] By applying the above technical solutions to electrical devices, highly reliable batteries can be used. These devices can fully utilize the battery's vibration resistance and tear resistance properties, enabling them to maintain stability, reducing the risk of failure caused by internal battery structural problems, and thus improving the user experience.

[0088] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery, characterized in that, include: The housing (10) includes a first wall (11) on which a first electrode terminal (31) is provided; A battery cell (20) is disposed within the housing (10). The battery cell (20) includes a body portion (21) and a tab extending along one side of the body portion (21). The tab extends in a first direction (X). The tab and the first wall (11) are disposed opposite to each other in the first direction (X). The tab includes a first tab (22) and a second tab (23) with opposite polarities. The first tab (22) and the second tab (23) are insulated from each other. The arrangement direction of the first tab (22) and the second tab (23) is a second direction. The second direction (Z) is perpendicular to the first direction (X). The housing (10) further includes a second wall (13), which is adjacent to the first wall (11). The second wall (13) is used to support the cell (20) in the second direction (Z). In the second direction (Z), the first tab (22) is disposed away from the second wall (13) relative to the second tab (23). The first tab (22) is welded to the first electrode terminal (31) to form a first solder mark (221). Wherein, along the first direction (X), the size of the body part is L mm, and along the second direction (Z), the size of the body part is H mm, and L / H satisfies: 1.5≤L / H≤5; The weight of the battery is Gkg, which satisfies 8kg≤Gkg≤15kg; Along the second direction (Z), the distance h1mm between the first solder mark (221) and the first side (201) of the body part (21) facing away from the second wall (13) ranges from 7 to 40mm.

2. The battery according to claim 1, characterized in that, The ratio of the projected area of ​​the first solder mark (221) on the first wall (11) to the projected area of ​​the first electrode tab (22) on the first wall (11) is 0.02 to 0.

4.

3. The battery according to claim 1, characterized in that, The first solder mark (221) is symmetrically arranged along the central axis of the first electrode (22) in the second direction (Z).

4. The battery according to claim 1, characterized in that, The size of the first solder mark (221) along the first direction (X) is smaller than the size of the first solder mark (221) along the second direction (Z).

5. The battery according to any one of claims 1-4, characterized in that, The first wall (11) is provided with a second electrode terminal (32) with the opposite polarity to the first electrode terminal (31). The first electrode terminal (31) and the second electrode terminal (32) are spaced apart and insulated in the second direction (Z). The second electrode tab (23) is welded to the second electrode terminal (32) to form a second solder mark (231). In the second direction (Z), the distance h2mm between the second solder mark (231) and the second side (202) of the cell (20) near the second wall (13) is in the range of 7~40mm.

6. The battery according to claim 5, characterized in that, The projected area of ​​the first solder mark (221) on the first wall (11) is greater than the projected area of ​​the second solder mark (231) on the first wall (11).

7. The battery according to claim 5, characterized in that, The size of the second solder mark (231) along the first direction (X) is smaller than the size of the second solder mark (231) along the second direction (Z).

8. The battery according to claim 5, characterized in that, The second solder mark (231) is symmetrically arranged along the central axis of the second electrode (23) in the second direction (Z).

9. The battery according to claim 5, characterized in that, The first tab (22) and the second tab (23) are symmetrically arranged relative to the cell (20) along the central axis of the second direction (Z), and the first solder mark (221) and the second solder mark (231) are symmetrically arranged relative to the cell (20) along the central axis of the second direction (Z).

10. The battery according to any one of claims 1-4, characterized in that, The battery also includes: A pad (40) is disposed between the body part (21) and the second wall (13) along the second direction (Z), and the pad (40) is used to support the body part (21).

11. The battery according to claim 10, characterized in that, In the first direction (X), the dimension of the pad (40) on the side away from the electrode in the second direction (Z) is greater than the dimension of the pad (40) on the side close to the electrode in the second direction (Z). The end of the pad (40) away from the electrode in the first direction (X) abuts against the side of the body part (21) close to the second wall (13).

12. The battery according to claim 10, characterized in that, The housing (10) includes a third wall (12), which is disposed opposite to the first wall (11) in the first direction (X), and the third wall (12) is provided with a pressure relief mechanism (50). The pad (40) is provided with an exhaust channel (40a) that communicates with the pressure relief mechanism (50), and the exhaust channel (40a) passes through the pad (40) along the first direction (X).

13. The battery according to claim 12, characterized in that, An insulating member (60) is provided between the third wall (12) and the main body (21), and the insulating member (60) is provided with a protrusion (61) protruding toward the battery cell (20).

14. The battery according to any one of claims 1-4, characterized in that, The area of ​​the first tab (22) ranges from 800 to 2100 mm. 2 ; and / or, the area of ​​the second electrode (23) ranges from 800 to 2100 mm. 2 .

15. The battery according to any one of claims 1-4, characterized in that, The range of Lmm is 300~800mm; and / or, the range of Hmm is 120~200mm.

16. The battery according to any one of claims 1-4, characterized in that, The capacity range of the battery cell (20) is 350-800Ah.

17. A battery pack, characterized in that, include: The base plate and the battery as claimed in any one of claims 1-16, the battery being placed on the base plate, the base plate being used to support the second wall (13) of the battery housing (10) in the second direction (Z), the base plate being parallel to the first direction (X).

18. An electrical appliance, characterized in that, include: The battery as described in any one of claims 1-16 or the battery pack as described in claim 17.

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