Battery devices and battery packs

Abstract

This utility model relates to the field of battery technology, specifically to a battery device and battery pack. The battery device includes a shell, a power output component, and an electrode component, all housed within a cavity. Multiple tabs extend from one side of the electrode component, and these tabs converge between the power output component and the electrode component, forming a solder mark. During the convergence process, multiple bends are sequentially formed vertically, with the bend adjacent to the solder mark being the first bend. The first distance L1 is within a certain range. In this design, the first bend is the inflection point closest to the solder mark when the tabs converge, and the first distance directly determines the redundancy of this tab segment. By limiting the range of the first distance, this design balances the requirements for tear resistance and inverted insertion resistance, ensuring sufficient buffer space for the bend segment while controlling redundancy to prevent inverted insertion or overlapping, thus improving the structural safety of the battery device.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery device and battery pack. Background Technology

[0002] Currently, before welding the battery tabs to the power output component, the tabs are first folded between the power output component and the electrode assembly, and then the tabs and the power output component are welded together. After welding is completed, the power output component is assembled onto the battery casing.

[0003] However, during the retraction process, parts of the tabs bend. In actual assembly or use, the redundant tabs can easily be inserted upside down into the electrode assembly under gravity or external pressure, posing a short-circuit risk. Utility Model Content

[0004] In view of this, the present invention provides a battery device and battery pack to solve the problem that when the tabs are folded up, the redundant tabs are easily inserted into the electrode assembly, causing a short circuit risk.

[0005] In a first aspect, this utility model provides a battery device, which includes:

[0006] The outer casing has an internal cavity; an opening is provided on one side of the outer casing.

[0007] The power output component is mounted on the housing and positioned corresponding to the opening.

[0008] An electrode assembly is disposed in a receiving cavity; multiple tabs extend from one side of the electrode assembly, and the multiple tabs are gathered between the power output assembly and the electrode assembly, and welded to the power output assembly to form a solder mark; during the gathering process, multiple bends are formed sequentially along the vertical direction, and the bend adjacent to the solder mark is the first bend.

[0009] In the horizontal direction, a first distance L1 is provided between the first bend and the solder mark, and the range of the first distance L1 is between 2mm and 8mm.

[0010] Beneficial Effects: In this design, the first bend is the inflection point closest to the solder mark when the tab is closed, and the first distance directly determines the redundancy of this tab segment. If the first distance is too small, the first bend is too close to the solder mark, and the tab becomes taut between the solder mark and the bend due to its short length, resulting in no buffer margin. When the battery vibrates, repeated stress can easily cause the solder mark edge to tear, leading to connection failure between the tab and the power output component. If the first distance is too large, the first bend is too far from the solder mark, increasing the redundancy of this tab segment. The tab is prone to drooping and inserting itself into the electrode assembly, causing short circuits between the positive and negative electrodes inside the electrode assembly through the tab, or contact with the inner wall of the casing, leading to insulation failure. Therefore, this design, by limiting the range of the first distance, balances the requirements for tear prevention and anti-inversion prevention, ensuring sufficient buffer space in the bend segment while controlling the redundancy, avoiding inversion or lap phenomena, and improving the structural safety of the battery device.

[0011] Secondly, the present invention also provides a battery pack, which includes a battery device as described in any of the above embodiments. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this utility model, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the overall structure of the battery device in an embodiment of this utility model;

[0014] Figure 2 This is a partial cross-sectional view of the battery device in an embodiment of this utility model;

[0015] Figure 3 for Figure 2 A magnified view of part A in the middle;

[0016] Figure 4 This is a top view of the electrode assembly in an embodiment of the present invention.

[0017] Explanation of reference numerals in the attached figures:

[0018] 1. Housing; 2. Power output component; 21. Pressure ring; 22. Terminal post;

[0019] 3. Electrode assembly; 31. Tab; 311. First bend; 312. Second bend; 313. End; 32. Solder mark; 4. Protective sheet; 41. Notch; 5. Insulating component. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0023] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0024] Currently, before welding the battery tabs 31 to the power output assembly 2, the tabs 31 are first folded between the power output assembly 2 and the electrode assembly 3, and then the tabs 31 and the power output assembly 2 are welded together. After welding, the power output assembly 2 is assembled onto the battery casing 1. However, during the folding process, parts of the tabs 31 are bent. In actual assembly or use, the redundant parts of the tabs 31 are prone to being inserted upside down into the electrode assembly 3 under gravity or external pressure, causing a short circuit risk.

[0025] In view of this, the present invention provides a battery device and battery pack to solve the problem that when the tabs 31 are folded up, the redundant part of the tabs 31 is easily inserted into the electrode assembly 3, causing a short circuit risk.

[0026] The following is combined Figures 1 to 4 The following describes embodiments of the present invention.

[0027] According to an embodiment of the present invention, a battery device is provided, which includes a housing 1, a power output component 2, and an electrode component 3.

[0028] Specifically, in this embodiment, such as Figures 1 to 4 As shown, the interior of the outer casing 1 has a receiving cavity, and the power output component 2 is mounted on the outer casing 1, corresponding to the opening. Alternatively, a cover plate can be provided on the outer casing 1, with an opening for mounting the power output component 2. The tab 31 passes through the opening and connects to the power output component 2, and then the power output component 2 is welded to the opening of the cover plate, thus completing the fixation of the power output component 2, the cover, and the outer casing 1. Of course, this embodiment is merely illustrative and does not limit the scope; those skilled in the art can modify it according to actual conditions to achieve the same technical effect.

[0029] Furthermore, in this embodiment, the electrode assembly 3 is disposed in the receiving cavity, and multiple tabs 31 extend from one side of the electrode assembly 3. The multiple tabs 31 are gathered between the power output assembly 2 and the electrode assembly 3, and welded to the power output assembly 2 to form a solder mark 32. During the gathering process, multiple bends are formed sequentially along the vertical direction, and the bend adjacent to the solder mark 32 is the first bend 311. Of course, other numbers of bends can be formed according to the actual situation, and the bending direction of each bend can also be adjusted according to the actual situation. When multiple bends are provided, the first bend can bend towards the left side of the electrode assembly 3, the second bend can bend towards the right side of the electrode assembly 3, the third bend can bend towards the left side of the electrode assembly 3, the fourth bend can bend towards the right side of the electrode assembly 3, and so on.

[0030] This embodiment is merely an example illustrating the number and direction of the bends, but it does not limit the scope of the invention. Those skilled in the art can make changes according to the actual situation, as long as the same technical effect is achieved.

[0031] Furthermore, in this embodiment, as Figure 3 As shown, in the horizontal direction, a first distance L1 is provided between the first bend 311 and the solder mark 32, and the range of the first distance L1 is between 2mm and 8mm.

[0032] For example, the value of the first distance L1 can be 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, etc. Of course, this embodiment is only an example of the value of the first distance L1, but it is not a limitation. Those skilled in the art can change it according to the actual situation, as long as the same technical effect can be achieved.

[0033] In this configuration, the first bend 311 is the inflection point closest to the solder mark 32 when the tab 31 is folded up, and the first distance directly determines the redundancy of this section of the tab 31. If the first distance is too small, the first bend 311 will be too close to the solder mark 32, and the tab 31 will be in a tight state between the solder mark 32 and the bend due to its short length, thus lacking buffer margin. When the battery vibrates, the edge of the solder mark 32 is easily torn due to repeated force, resulting in the failure of the connection between the tab 31 and the power output component 2. If the first distance is too large, the first bend 311 will be too far away from the solder mark 32, increasing the redundancy of this section of the tab 31. The tab 31 is prone to drooping and being inserted upside down into the electrode assembly 3, causing the positive and negative electrodes in the electrode assembly 3 to short-circuit through the tab 31, or to contact the inner wall of the outer casing 1, resulting in insulation failure. Therefore, by limiting the range of the first distance, this solution can balance the needs of tear prevention and inversion prevention, ensuring that the bending section has sufficient buffer space and controlling the redundancy, avoiding inversion or overlap, and improving the structural safety of the battery device.

[0034] Furthermore, in an alternative implementation, such as Figure 3 As shown, the first distance L1 ranges from 3mm to 6mm.

[0035] For example, the value of the first distance L1 can be 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, etc. Of course, this embodiment is only an example of the value of the first distance L1, but it is not a limitation. Those skilled in the art can change it according to the actual situation, as long as the same technical effect can be achieved.

[0036] With this setting, this embodiment further defines the specific range of the first distance. By refining the specific numerical range of the first distance, it can be specifically adapted to the needs of different application scenarios, ensuring that the performance of tear resistance and anti-reverse insertion can still be balanced under specific working conditions, and ensuring that the battery device can stably perform the anti-tear and anti-reverse insertion effects under different working conditions such as vibration and compactness.

[0037] Furthermore, in an alternative implementation, such as Figure 3As shown, in the horizontal direction, a second distance L2 is provided between the first bent portion 311 and the wall of the opening, and the range of the second distance L2 is between 5mm and 10mm.

[0038] For example, the value of the second distance L2 can be 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, etc. Of course, this embodiment is only an example of the value of the second distance L2, but it is not a limitation. Those skilled in the art can change it according to the actual situation, as long as the same technical effect can be achieved.

[0039] With this configuration, since the opening wall is a metal part of the outer casing 1, if the second distance is too small, the first bend 311 will be too close to the opening wall, resulting in insufficient gap between the tab 31 and the opening wall. During battery operation, this could lead to electrical sparking and arcing due to voltage differences, causing insulation failure between the tab 31 and the outer casing 1. If the second distance is too large, although insulation is safe, the tab 31, being short, will be in a taut state, lacking buffer margin. During battery vibration, repeated stress could cause the solder joint 32 to tear at the edge, resulting in connection failure between the tab 31 and the power output component 2. This embodiment limits the range of the second distance, ensuring that the gap between the first bend 311 and the opening wall exceeds the air breakdown distance, avoiding the risk of arcing. Simultaneously, by coordinating with the first distance, the redundancy of the tab 31 is controlled overall, balancing safety and structural compactness.

[0040] Furthermore, in an alternative embodiment, the power output component 2 includes a pressure ring 21 and a pole post 22.

[0041] Specifically, in this embodiment, the pressure ring 21 has a ring-shaped structure and is disposed on the opening. The pressure ring 21 and the opening can be welded together by welding the outer edge of the pressure ring 21 to the inner edge of the opening. Of course, this embodiment is only an example of the connection method between the opening and the pressure ring 21, but it is not a limitation. Those skilled in the art can make changes according to the actual situation, as long as the same technical effect can be achieved.

[0042] Furthermore, in this embodiment, the electrode post 22 is disposed on and connected to the pressure ring 21. Since the opening on the pressure ring 21 is adapted to the electrode post 22, the outer edge of the electrode post 22 can precisely contact the inner edge of the opening. For the connection method between the electrode post 22 and the pressure ring 21, welding can be used to weld the outer edge of the electrode post 22 to the inner edge of the opening. Of course, this embodiment is merely an example of the connection method between the electrode post 22 and the pressure ring 21, but it is not intended to limit the scope. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0043] Furthermore, in this embodiment, as Figure 3 As shown, in the horizontal direction, a third distance L3 is provided between the first bent portion 311 and the inner wall of the pressure ring 21, and the range of the third distance L3 is between 1 mm and 8 mm.

[0044] For example, the value of the third distance L3 can be 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, etc. Of course, this embodiment is merely an example of the possible values ​​for the third distance L3, and does not impose any limitations. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0045] This design is appropriate because the pressure ring 21 is a metal component of the power output assembly 2. If the third distance is too small, the first bent portion 311 will be too close to the inner wall of the pressure ring 21, and the electrode tab 31 will easily come into contact with the pressure ring 21, leading to a short circuit. If the third distance is too large, the electrode tab 31, due to its short length, will be in a taut state, and repeated stress may cause the edge of the solder mark 32 to tear. This embodiment limits the range of the third distance, ensuring that the first bent portion 311 and the inner wall of the pressure ring 21 maintain a safe insulating distance, avoiding direct contact and short circuits, while controlling redundancy to reduce the possibility of tearing.

[0046] Furthermore, in an alternative implementation, such as Figure 3 As shown, in the horizontal direction, a fourth distance L4 is provided between the first bent portion 311 and the outer wall of the pole post 22, and the range of the fourth distance L4 is between 0 mm and 7 mm.

[0047] For example, the value of the fourth distance L4 can be 0mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, etc. Of course, this embodiment is merely an example of the possible values ​​for the fourth distance L4, and does not impose any limitations. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0048] This design is appropriate because the outer wall of the terminal post 22 is typically equipped with an insulating component. If the fourth distance is too small, the first bend 311 will be too close to the outer wall of the terminal post 22, causing the tab 31 to overlap with the insulating component. During battery operation, the voltage difference may cause the insulating component to break down, leading to insulation failure between the tab 31 and the outer casing 1. If the fourth distance is too large, the tab 31 will be too short and taut, making it prone to tearing at the edge of the solder mark 32 due to repeated stress. This embodiment limits the range of the fourth distance, protecting the insulating component from breakdown, maintaining insulation performance, controlling redundancy, and reducing the risk of tearing.

[0049] Furthermore, in an alternative implementation, such as Figure 3 As shown, a fifth distance L5 is provided between the first bent portion 311 and the geometric center of the pole post 22 in the horizontal direction. The range of the fifth distance L5 is between 3mm and 10mm.

[0050] For example, the value of the fifth distance L5 can be 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, etc. Of course, this embodiment is merely an example of the possible values ​​for the fifth distance L5, and does not impose any limitations. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0051] With this configuration, since the geometric center of the pole post 22 serves as the force reference for the power output component 2, if the fifth distance is too large, causing the first bending portion 311 to deviate too far from the center of the pole post 22, the tab 31 will shift towards the side wall of the outer casing 1 when it retracts, resulting in a reduced distance from the outer casing 1 and a risk of insulation failure. Furthermore, excessive offset distance can cause misalignment, affecting welding quality. If the fifth distance is too small, it may limit the buffer space of the bending section, leading to easy tearing. Therefore, this embodiment limits the range of the fifth distance to ensure that the first bending portion 311 is symmetrically distributed around the center of the pole post 22, avoiding unilateral offset, balancing the buffer space and structural symmetry, and improving the consistency of multiple tabs 31 when retracted.

[0052] Furthermore, in an alternative implementation, such as Figure 3 As shown, a sixth distance L6 is provided between the first bent portion 311 and the end 313 of the tab 31 in the horizontal direction. The range of the sixth distance L6 is between 4mm and 15mm.

[0053] For example, the value of the sixth distance L6 can be 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, 10.5mm, 11mm, 11.5mm, 12mm, 12.5mm, 13mm, 13.5mm, 14mm, 14.5mm, 15mm, etc. Of course, this embodiment is merely an example of the possible values ​​for the sixth distance L6, and does not impose any limitations on it. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0054] In this embodiment, the sixth distance is the length from the end 313 of the tab 31 to the first bend 311. If the sixth distance is too large, the end 313 of the tab 31 will sag due to gravity, and may be inserted upside down into the electrode assembly 3, causing a short circuit. If the sixth distance is too small, the end 313 of the tab 31 will be too short, causing it to be taut. During vibration, the stress will be directly transmitted to the first bend 311, which may cause tearing. Therefore, by limiting the range of the sixth distance, this embodiment can balance the stability of the end 313 of the tab 31 and the strength of the bend, avoiding short circuits caused by the end 313 of the tab 31 being inserted upside down due to an excessively large sixth distance, or tearing of the first bend 311 due to an excessively small sixth distance. This balances the slack of the free segment and improves the vibration resistance of the tab 31.

[0055] Furthermore, in an optional embodiment, multiple tabs 31 are welded to the lower surface of the power output component 2 in the vertical direction to form the solder mark 32. That is, the tops of the multiple tabs 31 are welded to the bottom of the power output component 2 in the vertical direction to form the solder mark 32.

[0056] Furthermore, in an optional embodiment, a seventh distance L7 is provided between the surface of the first bent portion 311 facing away from the bending direction and the solder mark 32, the seventh distance L7 being between 4 mm and 9 mm. That is, a seventh distance L7 is provided between the outer wall of the first bent portion 311 and the solder mark 32.

[0057] For example, the value of the seventh distance L7 can be 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, etc. Of course, this embodiment is only an example of the value of the seventh distance L7, but it is not a limitation. Those skilled in the art can change it according to the actual situation, as long as the same technical effect can be achieved.

[0058] Further, in an optional embodiment, after the plurality of tabs 31 are folded together, a first bending portion 311 and a second bending portion 312 are sequentially formed along the direction close to the electrode assembly 3. The first bending portion 311 bends toward the first sidewall of the electrode assembly 3, and the second bending portion 312 bends toward the second sidewall of the electrode assembly 3. The bending directions of the first bending portion 311 and the second bending portion 312 can be opposite. As described in the above embodiment, the first sidewall of the electrode assembly 3 can be the left sidewall of the electrode assembly 3, and the second sidewall of the electrode assembly 3 can be the right sidewall of the electrode assembly 3. Of course, the first sidewall of the electrode assembly 3 can be the right sidewall of the electrode assembly 3, and the second sidewall of the electrode assembly 3 can be the left sidewall of the electrode assembly 3. This embodiment is merely an example of the bending direction, but it is not intended to limit it. Those skilled in the art can make changes according to the actual situation, as long as the same technical effect is achieved.

[0059] Furthermore, in this embodiment, as Figure 3 As shown, along the horizontal direction, an eighth distance L8 is provided between the first bending portion 311 and the second bending portion 312, and the range of the eighth distance L8 is between 2mm and 8mm.

[0060] For example, the value of the eighth distance L8 can be 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, etc. Of course, this embodiment is merely an example of the value of the eighth distance L8, but it is not a limitation. Those skilled in the art can change it according to the actual situation, as long as the same technical effect is achieved.

[0061] In this embodiment, the tab 31, after being bent, forms a first bent portion 311 and a second bent portion 312, which enhances the cushioning performance. However, the eighth distance is the length of the double-bending segment. If the ninth distance is too small, the two bent portions will be too close, and the tab 31 will be prone to tearing due to the concentrated curvature at the double bend. If the eighth distance is too large, the two bent portions will be too far apart, increasing the redundancy of the double-bending segment. The second bent portion 312 may cause the end 313 of the tab 31 to droop, which may lead to the risk of inversion. Therefore, this embodiment balances the cushioning performance and redundancy of the double bend by limiting the range of the eighth distance. It enhances the vibration resistance through the double bend while avoiding tearing or inversion, thus improving the overall structural stability.

[0062] Furthermore, in an alternative embodiment, the battery device further includes an insulating film and a protective sheet 4.

[0063] Specifically, in this embodiment, an insulating film is wrapped around the outer surface of the electrode assembly 3. The insulating film can be a Mylar film. Of course, other types of insulating films can also be used. This embodiment is merely an example of the type of insulating film, but it is not a limitation. Those skilled in the art can make changes according to the actual situation, as long as the same technical effect can be achieved.

[0064] Furthermore, in this embodiment, the protective sheet 4 is disposed on the top of the electrode assembly 3, and the protective sheet 4 is made of insulating material. Both ends of the protective sheet 4 are connected to the insulating film, and the protective sheet 4 is located between the second bend 312 and the top of the electrode assembly 3.

[0065] Regarding the structural form of the protective sheet 4, for example, the protective sheet 4 can cover the top of the electrode assembly 3, and has through holes at the positions corresponding to the tabs 31, so that the protective sheet 4 forms a U-shaped structure, that is, the periphery of the tabs 31 is covered by the protective sheet 4. Furthermore, the tabs 31 are connected to the electrode post 22 after passing through the through holes.

[0066] With this configuration, a protective sheet 4 is provided in this embodiment. Since the protective sheet 4 is made of insulating material, it can form an insulating barrier between the second bend 312 and the top of the electrode assembly 3. Even if the tab 31 is inserted backwards due to excessive redundancy, the backwards part of the tab 31 will only contact the protective sheet 4. Under the insulating effect of the protective sheet 4, a short circuit can be avoided. At the same time, the insulating film covering the electrode assembly 3 can further enhance the insulation between the electrode assembly 3 and the outer shell 1, playing a certain role in insulation protection.

[0067] Furthermore, in an optional embodiment, in the length direction of the electrode assembly 3, the overlap dimension of the protective sheet 4 and the insulating film at the connection point is a ninth distance L9, the ninth distance L9 being between 15mm and 30mm.

[0068] For example, the value of the ninth distance L9 can be 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, etc. Of course, this embodiment is merely an example of the possible values ​​for the ninth distance L9, and does not impose any limitations. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0069] By configuring the protective sheet 4 and the insulating film at their connection point within a certain range, this embodiment ensures the connection strength between the protective sheet 4 and the insulating film without affecting the heat dissipation performance of the electrode assembly 3. If the overlap between the protective sheet 4 and the insulating film at their connection point is too small, the connection strength will be poor, failing to meet manufacturing requirements. If the overlap between the protective sheet 4 and the insulating film at their connection point is too large, the area covered by the protective sheet 4 on the insulating film will be too large, significantly affecting the heat dissipation of the electrode assembly 3.

[0070] Furthermore, in an alternative implementation, such as Figure 4 As shown, in the horizontal direction, a tenth distance L10 is provided between the inner edge of the protective sheet 4 and the second bending portion 312, and the range of the tenth distance L10 is between 1mm and 5mm.

[0071] For example, the value of the tenth distance L10 can be 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc. Of course, this embodiment is only an example of the value of the tenth distance L10, but it is not a limitation. Those skilled in the art can change it according to the actual situation, as long as the same technical effect can be achieved.

[0072] By setting it in this way, this embodiment limits the range of the tenth distance. If the tenth distance is too large, causing the protective sheet 4 to be too far away from the second bend 312, the tab 31 may insert into the electrode assembly 3 through the gap between the protective sheet 4 and the bend, making it impossible for the protective sheet 4 to effectively intercept the inverted tab 31. If the tenth distance is too small, causing the protective sheet 4 to be too close to the second bend 312, the tab 31 may be torn during battery vibration. Therefore, this embodiment limits the range of the tenth distance, which can effectively intercept the inverted tab 31 and prevent the tab 31 from being torn during vibration, thereby improving the stability of the overall structure.

[0073] Furthermore, in an optional embodiment, an insulating element is provided on the top of the outer casing 1, and a notch 41 is provided on the outer edge of the protective sheet 4.

[0074] Normally, the insulating component is connected to the top edge of the insulating film by heat fusion. Since the protective sheet 4 occupies a portion of the top edge of the insulating film, the heat fusion area between the insulating component and the insulating film is reduced. However, in this embodiment, a notch 41 is provided on the protective sheet 4. The notch 41 reduces the area occupied by the protective sheet 4, thereby increasing the heat fusion area between the insulating component and the insulating film. This helps to ensure the connection strength between the insulating component and the insulating film, allowing them to fit tightly together and form a continuous insulating sealing layer, thus improving the overall sealing performance and insulation reliability.

[0075] Furthermore, in an alternative embodiment, the protective sheet 4 is integrally formed with the insulating film.

[0076] In traditional designs, the protective sheet 4 and the insulating film are separate components. This separation can create gaps at the connection points, allowing water or dust to enter, and requires precise alignment during assembly, increasing the risk of errors. In contrast, this embodiment integrates the protective sheet 4 and the insulating film into a single unit. This integrated design eliminates gaps, improving sealing. It also reduces the number of parts, simplifies assembly, and ensures precise positioning of the protective sheet 4 and the insulating film, resulting in more stable protection.

[0077] Secondly, the present invention also provides a battery pack, which includes a battery device as described in any of the above embodiments.

[0078] 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 all fall within the scope defined by the appended claims.

Claims

1. A battery device characterized by comprising: include: The outer shell (1) has an internal cavity; an opening is provided on one side of the outer shell (1); An electrical output component (2) is disposed on the housing (1) and is disposed corresponding to the opening; An electrode assembly (3) is disposed in the receiving cavity; multiple tabs (31) are led out from one side of the electrode assembly (3), and the multiple tabs (31) are gathered between the power output assembly (2) and the electrode assembly (3), and are welded to the power output assembly (2) to form a solder mark (32); during the gathering process, multiple bends are formed in sequence along the vertical direction, and the bend adjacent to the solder mark (32) is the first bend (311); In the horizontal direction, a first distance L1 is provided between the first bend (311) and the solder mark (32), and the first distance L1 ranges from 2 mm to 8 mm.

2. The battery device according to claim 1, characterized by, The first distance L1 is between 3mm and 6mm.

3. The battery device according to claim 2, characterized by In the horizontal direction, a second distance L2 is provided between the first bent portion (311) and the hole wall of the opening, the second distance L2 being between 5 mm and 10 mm.

4. The battery device according to claim 3, characterized by The power output component (2) includes: A pressure ring (21) is provided on the opening; A pole post (22) is disposed on the pressure ring (21) and connected to the pressure ring (21); In the horizontal direction, a third distance L3 is provided between the first bent portion (311) and the inner wall of the pressure ring (21), and the third distance L3 is in the range of 1 mm to 8 mm.

5. The battery device according to claim 4, characterized in that, In the horizontal direction, a fourth distance L4 is provided between the first bent portion (311) and the outer wall of the pole post (22), the fourth distance L4 being between 0 mm and 7 mm.

6. The battery device according to claim 4 or 5, characterized by, Along the horizontal direction, a fifth distance L5 is provided between the first bent portion (311) and the geometric center of the pole post (22), the fifth distance L5 being between 3mm and 10mm.

7. The battery device according to claim 6, characterized by Along the horizontal direction, a sixth distance L6 is provided between the first bent portion (311) and the end (313) of the tab (31), the sixth distance L6 being between 4 mm and 15 mm.

8. The battery device according to any one of claims 1 to 5, characterized by, Along the vertical direction, multiple tabs (31) are welded to the lower surface of the power output component (2) to form the solder mark (32).

9. The battery device according to any one of claims 1 to 5, wherein The first bent portion (311) has a seventh distance L7 between its surface away from the bending direction and the solder mark (32), the seventh distance L7 being between 4 mm and 9 mm.

10. The battery device according to any one of claims 1 to 5, characterized by, After the multiple tabs (31) are folded together, a first bend (311) and a second bend (312) are formed sequentially along the direction close to the electrode assembly (3); an eighth distance L8 is provided between the first bend (311) and the second bend (312) in the horizontal direction; the eighth distance L8 is between 2 mm and 8 mm.

11. The battery device according to claim 10, characterized by The battery device also includes: An insulating film is used to cover the outer surface of the electrode assembly (3); A protective sheet (4) is disposed on the top of the electrode assembly (3); and the two ends of the protective sheet (4) are connected to the insulating film, and the protective sheet (4) is located between the second bend (312) and the top of the electrode assembly (3).

12. The battery device according to claim 11, characterized by The protective sheet (4) covers the top of the electrode assembly (3) and has a through hole at the position corresponding to the tab (31) to form a U-shaped structure. The tab (31) passes through the through hole and is connected to the pole post (22).

13. The battery device of claim 12, wherein, Along the length of the electrode assembly (3), the overlap dimension between the protective sheet (4) and the insulating film at the connection point is a ninth distance L9, which ranges from 15 mm to 30 mm.

14. The battery device according to claim 12 or 13, characterized by, In the width direction of the electrode assembly (3), a tenth distance L10 is provided between the inner edge of the protective sheet (4) and the second bent portion (312), and the tenth distance L10 ranges from 1 mm to 5 mm.

15. The battery device according to claim 12 or 13, characterized by, An insulating element is provided on the top of the outer shell (1), and a notch (41) is provided on the outer edge of the protective sheet (4).

16. The battery device according to claim 12 or 13, characterized by, The protective sheet (4) is integrally formed with the insulating film.

17. A battery pack, characterized by include: The battery device as described in any one of claims 1 to 16.

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