Battery and battery pack

Abstract

The invention relates to the technical field of batteries, and discloses a battery and a battery pack. The battery comprises a packaging film, a pole group, a tab and an insulating part, a containing space is formed in the packaging film, the pole group is arranged in the containing space, one end of the tab is arranged in the containing space and electrically connected with the pole group, the other end of the tab extends out of the packaging film, and a connecting area is arranged on the outer surface of the tab. The insulating part and the packaging film are connected in a hot melting and sealing mode, plastic package marks are formed at the edge packaging position of the packaging film, the length of the insulating part is x, the distance between the plastic package marks on the two opposite sides is y, and x / y is larger than or equal to 0.1 and smaller than or equal to 0.8. According to the invention, by limiting the ratio (x / y is more than or equal to 0.1 and less than or equal to 0.8) of the length x of the insulating part to the distance y between the plastic sealing marks on the two opposite sides, the stable connection between the tab and the hot melting plastic sealing area of the packaging film can be ensured, and the condition that the tab is easy to fall off from the hot melting plastic sealing part of the packaging film when being stressed is avoided, so that the safety and stability of the battery in the use process are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly to batteries and battery packs. Background Art

[0002] Soft-pack batteries have advantages such as high specific energy, small volume, and light weight. Therefore, the application market of soft-pack batteries is relatively large. A soft-pack battery mainly includes tab ears, a cell stack, and a packaging film. The packaging film encapsulates the cell stack and the tab ears, and seals the edges of the packaging film through hot pressing.

[0003] In the prior art, it mainly includes tab ears, a cell stack, and a packaging film. The packaging film encapsulates the cell stack and the tab ears, and seals the edges of the packaging film through hot pressing. However, there is a problem that cannot be ignored in the actual use of soft-pack batteries. When a soft-pack battery is subjected to mechanical shock, the connection and sealing state of the hot-melt plastic sealing area between the tab ear and the packaging film may fail, which undoubtedly brings potential risks and uncertainties to the use of soft-pack batteries. Summary of the Invention

[0004] In view of this, the present invention provides a battery and a battery pack to solve the problem that the connection and sealing state of the hot-melt plastic sealing area between the tab ear and the packaging film may fail when the battery is subjected to mechanical shock.

[0005] In a first aspect, the present invention provides a battery, including:

[0006] A packaging film, which has an accommodation space inside, and the four peripheral edges of the packaging film are hot-melt sealed to form plastic sealing marks;

[0007] A cell stack, which is arranged in the accommodation space;

[0008] A tab ear, one end of which is arranged in the accommodation space and is electrically connected to the cell stack, and the other end extends out of the packaging film. A connection area is provided on the outer surface of the tab ear;

[0009] An insulating member, which is arranged on a part of the outer surface around the connection area and along the width direction of the battery, and the insulating member is hot-melt sealed and connected to the packaging film;

[0010] Along the width direction of the battery, the length of the insulating member is x, and the distance between the opposite two plastic sealing marks is y, satisfying 0.1 ≤ x / y ≤ 0.8.

[0011] Beneficial effects: For this battery, one end of the tab ear is electrically connected to the cell stack, and a connection area is provided on its outer surface. An insulating member is pasted on this area, realizing the hot sealing between the tab ear and the packaging film, effectively ensuring the smooth electrical connection between the tab ear and the cell stack and the sealing of the package. At the same time, extending the other end of the tab ear outside the packaging film greatly facilitates operations such as connecting the battery to an external circuit.

[0012] By limiting the ratio of the length x of the insulating part to the distance y between the plastic sealing marks on both sides (0.1≤x / y≤0.8), the connection between the tab and the hot-melt plastic sealing area of ​​the packaging film can be ensured to be stable, avoiding the tab from easily falling off from the hot-melt plastic sealing area of ​​the packaging film when the tab is subjected to force, thereby ensuring the safety and stability of the battery during use.

[0013] When the x / y ratio is less than 0.1, the hot melt sealing joint surface between the insulating part and the packaging film is too small, which significantly reduces the strength of the hot melt sealing connection between the two, and the tab is prone to pull-off when the tab is stressed. When the x / y ratio is greater than 0.8, the tab accounts for too large a proportion, so that when the tab is stressed, the tab and the packaging film hot melt sealing are prone to fall off.

[0014] In an optional implementation, the length x of the insulating member satisfies 5mm≤x≤300mm.

[0015] Beneficial effect: When the length of the insulating part is within this range, combined with the appropriate x / y ratio (0.1≤x / y≤0.8), it can ensure that the pole ear and the packaging film have sufficient connection area. During the use of the battery, whether it is a slight vibration during normal operation or a certain degree of mechanical shock that may be suffered, the separation of the pole ear and the packaging film can be effectively prevented. At the same time, the appropriate length of the insulating part helps to balance the electrical performance and structural stability of the battery. On the one hand, it ensures good electrical contact between the pole ear and the packaging film, reduces contact resistance, and reduces energy loss; on the other hand, it provides sufficient support and fixation for the pole ear in structure to prevent the pole ear from displacement or deformation inside the battery, thereby protecting the internal structure of the battery and extending the battery life.

[0016] If the length of the insulating part is too short (x≤5mm), it may increase the difficulty of processing and increase the scrap rate; if it is too long (x≥300mm), it will not only waste raw materials but also reduce production efficiency. Within this range (5mm≤x≤300mm), the production efficiency can be improved and the production cost can be reduced while ensuring the quality, making the large-scale production of batteries more economical and feasible.

[0017] In an optional implementation, a dimension of a distance y between the plastic sealing marks on two opposite sides satisfies 8mm≤y≤500mm.

[0018] Beneficial effect: Setting the plastic seal mark spacing y on both sides within the range of 8mm≤y≤500mm can provide sufficient support and sealing area for the packaging film. When the battery is subjected to external pressure or impact, the appropriate plastic seal mark spacing can make the packaging film evenly stressed, preventing excessive local deformation from causing packaging failure.

[0019] A suitable plastic seal indentation spacing helps maintain the pressure balance inside the battery. During the charging and discharging process of the battery, substances such as gas are generated. A reasonable spacing allows the packaging film to adapt to internal pressure changes to a certain extent, preventing the packaging film from rupturing or the tab seal from failing due to excessive pressure, thus ensuring the safety of battery use. At the same time, a stable packaging structure is also conducive to maintaining a stable chemical environment inside the battery, ensuring the consistency and reliability of battery performance.

[0020] If the spacing y is too small, it may increase the packaging difficulty, require higher equipment precision, and is prone to poor packaging. If the spacing y is too large, it may require larger-sized packaging materials, increasing material costs and potentially affecting production efficiency. When 8mm ≤ y ≤ 500mm within this range, production efficiency can be improved and production costs can be reduced while ensuring packaging quality, making the large-scale production of batteries more feasible and economical.

[0021] In an alternative embodiment, along the length direction of the battery, the spacing from the edge of the connection area to the side of the insulating member is E, satisfying 2mm ≤ E ≤ 50mm.

[0022] Beneficial effects: When E is within this range, during the production process of tab encapsulation, it provides a suitable space for equipment operation and material fitting. It can achieve efficient utilization of materials, reduce production costs, and improve the market competitiveness of products while ensuring battery performance.

[0023] If E is too small, for example, less than 2mm, it will make the pasting space of the insulating member too narrow, resulting in difficult and inaccurate equipment operation, increasing the rejection rate during the production process and reducing production efficiency. If E is too large, such as exceeding 50mm, it will cause space waste, and at the same time, the insulating member may lack sufficient restraint after pasting, being prone to displacement or deformation, affecting the sealing and connection effect between the tab and the packaging film, and thus affecting the overall quality of the battery.

[0024] In an alternative embodiment, the tab includes a first connection section, a bending section, and a second connection section. At least part of the first connection section is disposed in the accommodation space and electrically connected to the electrode group. The first connection section and the second connection section are connected via the bending section. The plane where the first connection section is located is parallel to the plane where the second connection section is located, and the bending section is disposed at an angle to the first connection section.

[0025] Beneficial effects: The first connecting section and the second connecting section are connected by a bending section, and the plane where the first connecting section is located is parallel to the plane where the second connecting section is located. When the battery is subjected to external forces, such as being collided, squeezed or vibrated during transportation, installation or use, the bending section can effectively disperse stress and avoid stress concentration at the connection part between the tab and the encapsulation film or at the connection part between the tab and the electrode group. Compared with the straight tab design without a bending section, the bending section greatly enhances the overall strength of the tab, reduces the risk of the tab breaking or being damaged when stressed, thereby improving the structural stability and reliability of the battery. Since the bending section enhances the strength of the tab, the raw material thickness of the tab can be appropriately reduced on the premise of ensuring the overall performance of the tab.

[0026] In an optional embodiment, along the thickness direction of the battery, the distance from the plane where the first connecting section is located to the plane where the second connecting section is located is y1, and the thickness of the second connecting section is t1, satisfying 0 ≤ y1 / t1 ≤ 10.

[0027] Beneficial effects: When 0 ≤ y1 / t1 ≤ 10, the height of the bending section is adapted to the tab thickness t1, enabling the tab to effectively disperse stress through the bending section when subjected to external forces. When the battery is subjected to mechanical shock, a reasonable ratio can prevent the tab from breaking at the bending point, ensure the connection stability between the tab and the encapsulation film and between the tab and the electrode group, maintain the integrity of the internal structure of the battery, thereby ensuring the normal operation of the battery and improving the reliability and safety of the battery.

[0028] If y1 / t1 is too large, that is, the bending height is too high while the thickness is relatively too thin, the tab may not be able to effectively resist deformation when stressed, resulting in an insignificant increase in strength and being easily damaged; conversely, if y1 / t1 is too small, it may mean an excessive increase in the tab thickness, causing material waste and possibly increasing the battery weight.

[0029] In an optional embodiment, the distance from the plane where the first connecting section is located to the plane where the second connecting section is located is y1, satisfying 0 ≤ y1 ≤ 100 mm; and / or, the thickness of the second connecting section is t1, satisfying 0.1 mm ≤ t1 ≤ 20 mm.

[0030] Beneficial effects: By reasonably setting y1, when the tab is subjected to external forces (such as mechanical shock, vibration, etc.), stress can be more evenly distributed along the bending section, avoiding stress concentration at a certain point and causing damage to the tab. In the case where the battery may be subjected to lateral impact force, appropriately increasing y1 can enable the tab to better disperse the lateral force, protect the connection between the tab and the encapsulation film and between the tab and the electrode group, and improve the reliability and durability of the battery.

[0031] If y1 is too large, it may place excessive requirements on the specifications and precision of the bending equipment, increasing equipment costs and production difficulties; while if y1 is too small, it may be difficult to precisely control during the bending process, and dimensional deviations are likely to occur.

[0032] By reasonably setting t1, when welding the tab with other components (such as busbars, etc.), the tab can select a suitable welding method when connecting to different components, ensuring the welding quality and achieving good electrical connection.

[0033] If the thickness t1 of the second connection section of the tab is too thin, it may lead to insufficient material strength; while if the thickness t1 of the second connection section of the tab is too thick, it will waste materials, increase costs and may affect the performance of the battery such as energy density.

[0034] In an alternative embodiment, the angle between the bending section and the first connection section is k, satisfying 95° ≤ k; and / or, a bending mark is formed at the connection between the bending section and the first connection section, and the distance from the bending mark to the side of the insulating part is x1, satisfying 2 mm ≤ x1 ≤ 50 mm.

[0035] Beneficial effects: When the angle k satisfies 95° ≤ k, it is easier to achieve during the stamping and bending process of the tab. The larger angle makes the deformation of the material relatively gentle when the mold bends the tab, reducing the possibility of internal stress concentration in the material and the risk of defects such as cracks and fractures. It helps to improve the yield rate during the production process, reduce the generation of waste products, thereby improving production efficiency and reducing production costs. If the angle k is small, there is a possibility of fracture or damage at the bending point.

[0036] By maintaining an appropriate range of x1, the sealing and protection functions of the insulating part are ensured, which helps to maintain the stability of the chemical environment inside the battery, reduce the risk of electrolyte leakage, etc., thereby ensuring the stable charge and discharge performance of the battery and improving the cycle life and safety of the battery. If x1 is too small, the difficulty of attaching the insulating part during the production process will increase significantly, and quality problems are likely to occur. If x1 is too large, the distribution range of the insulating part on the tab will be too wide, which may lead to excessive use of the insulating part, increase material costs, and may also affect the overall layout and space utilization efficiency of the tab inside the battery.

[0037] In an alternative embodiment, along the width direction of the battery, the width of the second connection section is greater than the width of the first connection section.

[0038] Beneficial effects: When the battery is connected to the bus bar, the wider second connection section provides a larger contact area for the welding operation, making the welding more firm and reliable, effectively reducing the contact resistance, and reducing the energy loss and heat generation problems caused by poor connection. When the requirement for the welding mark is too large (when the welding area is larger than the range of x), the width of the welding area of the second connection section of the tab can be appropriately increased while ensuring the width of x, so as to ensure that the ratio of x / y is within the range of 0.1 - 0.8.

[0039] In a second aspect, the present invention also provides a battery pack, including a battery.

[0040] Beneficial effects: This battery pack, including the battery as described above, has all the beneficial technical effects of the battery, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0042] Figure 1 It is a schematic structural diagram of a battery according to an embodiment of the present invention;

[0043] Figure 2 It is a front view of a battery according to an embodiment of the present invention;

[0044] Figure 3 It is a side view of a battery according to an embodiment of the present invention;

[0045] Figure 4 It is a schematic structural diagram of a tab and an insulating member in a battery according to an embodiment of the present invention;

[0046] Figure 5 For Figure 4 The front view of the tab and the insulating member shown;

[0047] Figure 6 For Figure 4 The side view of the tab and the insulating member shown;

[0048] Figure 7 It is a schematic structural diagram of another tab and an insulating member in a battery according to an embodiment of the present invention;

[0049] Figure 8 For Figure 7 The front view of the tab and the insulating member shown;

[0050] Figure 9 ForFigure 7 Front view of the tab and the insulating member shown

[0051] Description of the reference numerals in the drawings:

[0052] 1. Encapsulation film; 101. Plastic sealing mark; 2. Tab; 201. First connection section; 2011. Connection area; 202. Second connection section; 203. Bending section; 2031. Bending mark; 3. Insulating member; 4. Electrode group Specific embodiments

[0053] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention

[0054] In the related art, a soft-pack battery mainly includes a tab, an electrode group, and an encapsulation film. The encapsulation film encapsulates the electrode group and the tab and seals the edge of the encapsulation film by hot pressing. However, there is a problem that cannot be ignored in the actual use of the soft-pack battery. When the soft-pack battery is subjected to mechanical shock, the connection and sealing state of the tab and the thermoplastic sealing area of the encapsulation film may fail, which undoubtedly brings potential risks and uncertainties to the use of the soft-pack battery

[0055] To solve the above technical problems, the following will be described in combination with Figures 1 to 9 , the embodiments of the present invention will be described

[0056] According to an embodiment of the present invention, on the one hand, as Figures 1 to 9 shown, a battery is provided, which includes an encapsulation film 1, an electrode group 4, a tab 2, and an insulating member 3

[0057] Specifically, as Figure 1 and Figure 2 shown, an accommodation space (not shown in the figure) is provided inside the encapsulation film 1

[0058] Specifically, as Figure 1 and Figure 2 shown, the electrode group 4 is installed in the accommodation space

[0059] Specifically, as Figures 1 to 4 shown, one end of the tab 2 is disposed in the accommodation space, and the end disposed in the accommodation space is electrically connected to the electrode group 4, and the other end extends out of the encapsulation film 1. A connection area 2011 is provided on the outer surface of the tab 2

[0060] Specifically, as Figures 1 to 4As shown, the insulating member 3 is disposed around the outer surface of the connection area 2011, and the insulating member 3 is arranged along the width direction of the battery. The insulating member 3 and the encapsulation film 1 are hermetically connected by heat melting, and a plastic seal mark 101 is formed at the edge encapsulation of the encapsulation film 1.

[0061] Specifically, as Figure 2 shown, along the width direction of the battery, the length of the insulating member 3 is x, and the distance between the plastic seal marks 101 on the opposite two sides is y, satisfying 0.1 ≤ x / y ≤ 0.8.

[0062] For this battery, one end of the tab 2 is electrically connected to the electrode group 4, and a connection area 2011 is arranged on its outer surface. The insulating member 3 is pasted in this area, realizing the heat seal between the tab 2 and the encapsulation film 1, effectively ensuring the smooth electrical connection between the tab 2 and the electrode group 4 and the sealing performance of the encapsulation. At the same time, the other end of the tab 2 extends outside the encapsulation film 1, greatly facilitating operations such as connecting the battery to an external circuit.

[0063] By limiting the ratio of the length x of the insulating member 3 to the distance y between the plastic seal marks 101 on the opposite two sides (0.1 ≤ x / y ≤ 0.8), it can ensure the stable connection of the heat - melted plastic - sealed area between the tab 2 and the encapsulation film 1, avoiding the situation that the tab 2 is easily detached from the heat - melted plastic - sealed part of the encapsulation film 1 when the tab 2 is stressed, thereby ensuring the safety and stability of the battery during use.

[0064] When the ratio of x / y is less than 0.1, the heat - melted plastic - sealed joint surface between the insulating member 3 and the encapsulation film 1 is too small, resulting in a significant reduction in the strength after their heat - sealed connection, and the tab 2 is extremely likely to be pulled off when stressed. When the ratio of x / y is greater than 0.8, the proportion of the tab 2 is too large, so the distance between the tab 2 and the plastic seal mark 101 is relatively small. When the tab 2 is stressed, the plastic seal mark 101 is too hard to deform flexibly to offset the stress, so the tab 2 is easily detached from the heat - melted plastic - sealed part of the encapsulation film 1, resulting in seal failure.

[0065] Specifically, there are two sets of tabs 2 on the battery. The two sets of tabs 2 can be respectively arranged on the opposite two sides of the encapsulation film 1, or the two sets of tabs 2 can both be arranged on the same side of the encapsulation film 1. In the embodiment of the present application, the position of the tab 2 is not specifically limited.

[0066] Specifically, the insulating member 3 being disposed around the tab 2 means that the insulating member 3 is pasted on the front and back surfaces and the left and right side surfaces of the tab 2.

[0067] It should be noted that the insulating member 3 in the embodiment of the present invention can be tab glue.

[0068] In one embodiment, as Figure 2 shown, the dimension of the length x of the insulating member 3 satisfies 5 mm ≤ x ≤ 300 mm.

[0069] When the length of the insulating member 3 is within this range, combined with a suitable x / y ratio (0.1 ≤ x / y ≤ 0.8), it can ensure that there is sufficient connection area between the tab 2 and the encapsulation film 1. During the use of the battery, whether it is the slight vibration during normal operation or a certain degree of mechanical shock that the battery may suffer, it can effectively prevent the separation of the tab 2 from the encapsulation film 1. At the same time, the appropriate length of the insulating member 3 helps to balance the electrical performance and structural stability of the battery. On the one hand, it ensures good electrical contact between the tab 2 and the encapsulation film 1, reduces the contact resistance, and reduces energy loss; on the other hand, it provides sufficient support and fixation for the tab 2 structurally, preventing the tab 2 from shifting or deforming inside the battery, thereby protecting the internal structure of the battery and extending the service life of the battery.

[0070] If the length of the insulating member 3 is too short (x ≤ 5 mm), it may increase the processing difficulty and raise the scrap rate; while if it is too long (300 mm ≤ x), it will not only waste raw materials but also may lead to a reduction in production efficiency. Within this range (5 mm ≤ x ≤ 300 mm), it is possible to improve production efficiency and reduce production costs on the premise of ensuring quality, making the large-scale production of the battery more economical and feasible.

[0071] In one embodiment, as Figure 2 shown, the dimension of the distance y between the plastic sealing marks 101 on the opposite sides satisfies 8 mm ≤ y ≤ 500 mm.

[0072] Setting the distance y between the plastic sealing marks 101 on both sides within the range of 8 mm ≤ y ≤ 500 mm can provide sufficient support and sealing area for the encapsulation film 1. When the battery is subjected to external pressure or impact force, the appropriate distance between the plastic sealing marks 101 can make the encapsulation film 1 bear the force evenly, preventing excessive local deformation and resulting in encapsulation failure.

[0073] The appropriate distance between the plastic sealing marks 101 helps to maintain the pressure balance inside the battery. During the charge and discharge process of the battery, substances such as gas are generated. A reasonable distance can enable the encapsulation film 1 to adapt to the internal pressure change to a certain extent, preventing the encapsulation film 1 from bursting or the tab 2 from seal failure due to excessive pressure, thereby ensuring the use safety of the battery. At the same time, a stable encapsulation structure is also conducive to maintaining the stability of the chemical environment inside the battery and ensuring the consistency and reliability of the battery performance.

[0074] If the distance y is too small, it may increase the encapsulation difficulty, require higher equipment precision, and is prone to poor encapsulation; if the distance y is too large, it may require larger-sized encapsulation materials, increasing the material cost and may also affect the production efficiency. When within the range of 8 mm ≤ y ≤ 500 mm, it is possible to improve production efficiency and reduce production costs on the premise of ensuring the encapsulation quality, making the large-scale production of the battery more feasible and economical.

[0075] In one embodiment, as Figure 2 shown, along the length direction of the battery, the distance from the edge of the connection region 2011 to the side of the insulating member 3 is E, and 2 mm ≤ E ≤ 50 mm is satisfied.

[0076] When E is within this range, during the production process of encapsulating the tab 2, it provides a suitable space for equipment operation and material lamination. It can achieve efficient utilization of materials, reduce production costs, and improve the market competitiveness of products while ensuring the battery performance.

[0077] If E is too small, for example, less than 2 mm, it will make the lamination space of the insulating member 3 too narrow, resulting in difficult precise operation of the equipment, increasing the rejection rate during the production process, and reducing production efficiency; while if E is too large, such as exceeding 50 mm, it will cause waste of space, and at the same time, the insulating member 3 may lack sufficient restraint after lamination, prone to displacement or deformation, affecting the sealing and connection effect between the tab 2 and the encapsulation film 1, and further affecting the overall quality of the battery.

[0078] In one embodiment, as Figures 4 to 6 shown, the tab 2 includes a first connection segment 201, a bending segment 203, and a second connection segment 202. At least a part of the first connection segment 201 is disposed in the accommodation space and electrically connected to the electrode assembly 4. The first connection segment 201 and the second connection segment 202 are connected by the bending segment 203. The plane where the first connection segment 201 is located is parallel to the plane where the second connection segment 202 is located, and the bending segment 203 is disposed at an angle with the first connection segment 201.

[0079] The first connection segment 201 and the second connection segment 202 are connected by the bending segment 203, and the plane where the first connection segment 201 is located is parallel to the plane where the second connection segment 202 is located. When the battery is subjected to external forces, such as being collided, squeezed, or vibrated during transportation, installation, or use, the bending segment 203 can effectively disperse the stress, avoiding stress concentration at the connection part between the tab 2 and the encapsulation film 1 or the connection part between the tab 2 and the electrode assembly 4. Compared with the design of a straight tab 2 without the bending segment 203, the bending segment 203 greatly enhances the overall strength of the tab 2, reducing the risk of fracture or damage of the tab 2 when stressed, thereby improving the structural stability and reliability of the battery. Since the bending segment 203 enhances the strength of the tab 2, the raw material thickness of the tab 2 can be appropriately reduced while ensuring the overall performance of the tab 2.

[0080] In one embodiment, as Figure 6 shown, along the thickness direction of the battery, the distance from the plane where the first connection segment 201 is located to the plane where the second connection segment 202 is located is y1, and the thickness of the second connection segment 202 is t1, and 0 ≤ y1 / t1 ≤ 10 is satisfied.

[0081] When 0≤y1 / t1≤10, the height of the bending section 203 is adapted to the thickness t1 of the tab 2, so that the tab 2 can effectively disperse the stress through the bending section 203 when subjected to external force. When the battery is subjected to mechanical impact, a reasonable ratio can prevent the tab 2 from breaking at the bend, ensure the connection stability between the tab 2 and the packaging film 1 and between the tab 2 and the electrode group 4, maintain the integrity of the internal structure of the battery, thereby ensuring the normal operation of the battery and improving the reliability and safety of the battery.

[0082] If y1 / t1 is too large, that is, the bending height is too high and the thickness is relatively too thin, the tab 2 may not be able to effectively resist deformation when subjected to force, resulting in an unclear increase in strength and easy damage; conversely, if y1 / t1 is too small, it may mean that the thickness of the tab 2 is excessively increased, resulting in material waste and possible increase in battery weight.

[0083] In one embodiment, Figure 6 As shown, the distance from the plane where the first connecting section 201 is located to the plane where the second connecting section 202 is located is y1, which satisfies 0≤y1≤100mm. And / or, the thickness of the second connecting section 202 is t1, which satisfies 0.1mm≤t1≤20mm.

[0084] By setting y1 reasonably, when the tab 2 is subjected to external force (such as mechanical shock, vibration, etc.), the stress can be more evenly distributed along the bending section 203, avoiding stress concentration at a certain point and causing damage to the tab 2. In the case where the battery may be subjected to lateral impact force, appropriately increasing y1 can make the tab 2 better disperse the lateral force, protect the connection between the tab 2 and the packaging film 1 and between the tab 2 and the electrode group 4, and improve the reliability and durability of the battery.

[0085] If y1 is too large, the specifications and precision of the bending equipment may be too high, increasing the equipment cost and production difficulty; if y1 is too small, it may be difficult to accurately control the bending process, and dimensional deviations may easily occur.

[0086] By reasonably setting t1, when the tab 2 is welded with other components (such as a busbar, etc.), the tab 2 can select a suitable welding method when connected with different components, thereby ensuring welding quality and achieving good electrical connection.

[0087] If the thickness t1 of the second connecting section 202 of the tab 2 is too thin, the material strength may be insufficient; if the thickness t1 of the second connecting section 202 of the tab 2 is too thick, the material will be wasted, the cost will be increased, and the performance of the battery, such as the energy density, may be affected.

[0088] In one embodiment, Figure 2 and Figure 6As shown, the included angle between the bent section 203 and the first connecting section 201 is k, satisfying 95° ≤ k. And / or, a bent imprint 2031 is formed at the connection between the bent section 203 and the first connecting section 201, and the distance from the bent imprint 2031 to the side of the insulating part 3 is x1, satisfying 2 mm ≤ x1 ≤ 50 mm.

[0089] When the included angle k satisfies 95° ≤ k, it is easier to achieve during the stamping and bending process of the tab 2. The larger angle makes the deformation of the material relatively gentle when the die bends the tab 2, reducing the possibility of internal stress concentration in the material and lowering the risk of defects such as cracks and fractures. It helps to improve the yield rate during the production process, reduce the generation of waste products, thereby improving production efficiency and reducing production costs. If the included angle k is small, there is a possibility of fracture or damage at the bent part.

[0090] By maintaining an appropriate range of x1, the sealing and protection functions of the insulating part 3 are ensured, which helps to maintain the stability of the chemical environment inside the battery, reduce risks such as electrolyte leakage, and thus ensure the stable charge and discharge performance of the battery, improving the cycle life and safety of the battery. If x1 is too small, the difficulty of attaching the insulating part 3 during the production process will increase significantly, and quality problems are likely to occur. If x1 is too large, the distribution range of the insulating part 3 on the tab 2 will be too wide, which may lead to excessive use of the insulating part 3, increasing the material cost, and may also affect the overall layout and space utilization efficiency of the tab 2 inside the battery.

[0091] In one embodiment, as Figures 7 to 9 shown, along the width direction of the battery, the width of the second connecting section 202 is greater than the width of the first connecting section 201.

[0092] When the battery is connected to the bus bar, the wider second connecting section 202 provides a larger contact area for the welding operation, making the welding more firm and reliable, effectively reducing the contact resistance, and reducing energy loss and heating problems caused by poor connection. When the welding mark requirement is too large (when the welding area is larger than the range of x), the width of the welding area of the second connecting section 202 of the tab 2 can be appropriately increased while ensuring the width of x, ensuring that the ratio of x / y is within the range of 0.1 - 0.8.

[0093] According to an embodiment of the present invention, on the other hand, a battery pack is also provided, including a battery.

[0094] This battery pack includes the battery as described above and has all the beneficial technical effects of this battery, which will not be elaborated here.

[0095] To better illustrate the quality of the battery pack, the following experimental tests are taken as examples:

[0096]

[0097] Although embodiments of the present 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 present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A battery, characterized in that: include: The packaging film has a containing space therein, and the edges of the packaging film are hot-melted and sealed to form a plastic seal mark; A pole group, arranged in the accommodation space; A pole ear, one end of which is arranged in the accommodation space and electrically connected to the pole group, and the other end of which extends outward from the packaging film, and the outer surface of the pole ear is provided with a connection area connected to the packaging film; An insulating member, disposed on a portion of the outer surface surrounding the connection area and along the width direction of the battery, wherein the insulating member is connected to the packaging film by hot-melt sealing; Along the width direction of the battery, the length of the insulating member is x, and the spacing between the plastic sealing marks on two opposite sides is y, satisfying 0.1≤x / y≤0.

8.

2. The battery according to claim 1, characterized in that The length x of the insulating member satisfies 5mm≤x≤300mm.

3. The battery according to claim 1, characterized in that The distance y between the plastic sealing marks on two opposite sides satisfies 8mm≤y≤500mm.

4. The battery according to claim 1, characterized in that Along the length direction of the battery, the distance between the edge of the connection area and the side of the insulating member is E, which satisfies 2mm≤E≤50mm.

5. The battery according to any one of claims 1 to 4, characterized in that The pole ear includes a first connecting section, a bending section and a second connecting section. The first connecting section is at least partially arranged in the accommodating space and is electrically connected to the pole group. The first connecting section and the second connecting section are connected via the bending section. The plane where the first connecting section is located is parallel to the plane where the second connecting section is located. The bending section is arranged at an angle to the first connecting section.

6. The battery according to claim 5, characterized in that Along the thickness direction of the battery, the distance from the plane where the first connecting segment is located to the plane where the second connecting segment is located is y1, and the thickness of the second connecting segment is t1, satisfying 0≤y1 / t1≤10.

7. The battery according to claim 6, characterized in that The distance from the plane where the first connecting section is located to the plane where the second connecting section is located is y1, satisfying 0≤y1≤100mm; and / or the thickness of the second connecting section is t1, satisfying 0.1mm≤t1≤20mm.

8. The battery according to claim 5, characterized in that The angle between the bending section and the first connecting section is k, satisfying k≥95°; and / or a bending mark is formed at the connection between the bending section and the first connecting section, and the distance from the bending mark to the side of the insulating member is x1, satisfying 2mm≤x1≤50mm.

9. The battery according to claim 5, characterized in that Along the width direction of the battery, the width of the second connecting section is greater than the width of the first connecting section.

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

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