Battery device

Abstract

This utility model relates to the field of battery technology, specifically to a battery device. The battery device includes: a power output component; a battery cell with multiple tab groups; the multiple tab groups are welded to the power output component; each tab group has at least one tab, and each tab has the same unfolded length; when the tabs are in a straightened and unfolded state, the distance difference between the ends of two adjacent tab groups is x, and the total number of layers of all tabs in the multiple tab groups is n; the ratio between the distance difference and the total number of layers is x / n, and the ratio x / n is between 0.0125 and 0.4. This embodiment limits the ratio between the distance difference and the total number of layers to a certain range, which ensures that the ends of all tabs are as close as possible when converged to the welding area, preventing misalignment. Therefore, during welding, all tabs can be stably welded to the power output component, avoiding the problem of incomplete soldering due to misalignment.

Description

Technical Field

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

[0002] The tabs of existing batteries generally adopt an equal-length design. When the equal-length tabs are folded together and welded to the adapter or terminal post, the actual length of the tabs falling on the adapter or terminal post at different positions will be different, forming a misalignment.

[0003] When the misalignment is severe, the shorter tabs in the misaligned area may not be able to make effective contact with the welding area, which can easily lead to poor welding and thus affect the performance of the battery. Utility Model Content

[0004] In view of this, the present invention provides a battery device to solve the problem that the tabs of existing batteries have misaligned layers, which makes the tabs prone to poor soldering and affects the performance of the battery.

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

[0006] Power output components;

[0007] The battery cell is provided with multiple electrode groups; the multiple electrode groups are welded to the power output component; each electrode group is provided with at least one electrode, and each electrode has the same unfolded length;

[0008] When the tabs are stretched out, the distance difference between the ends of two adjacent tab groups is x, and the total number of tabs in two adjacent tab groups is n.

[0009] The ratio between the distance difference and the total number of layers is x / n, and the ratio x / n is between 0.0125 and 0.4.

[0010] Beneficial Effects: This embodiment limits the ratio between the distance difference and the total number of layers within a certain range. This ensures that the ends of all tabs are as close as possible to each other when the assembly reaches the welding area, preventing misalignment. This allows for stable welding of all tabs to the power output component during the welding process, preventing issues like incomplete welds due to misalignment. If the ratio is too large, the ends of adjacent tabs will differ significantly, easily leading to misalignment. If the ratio is too small, the lengths of adjacent tabs will be too similar, increasing the risk of tearing during assembly. Therefore, this embodiment ensures the reliability and structural stability of the welding between the tabs and the power output component. Attached Figure Description

[0011] 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.

[0012] Figure 1 This is a schematic diagram of the overall structure of the battery device in an embodiment of this utility model;

[0013] Figure 2 This is a first cross-sectional view of the battery device at the location of the power output component in an embodiment of this utility model;

[0014] Figure 3 This is a partial enlarged view of part A in the embodiment of this utility model (a schematic diagram of the electrode assembly being welded to the lower surface of the adapter piece);

[0015] Figure 4 This is a second cross-sectional view of the battery device at the location of the power output component in an embodiment of this utility model;

[0016] Figure 5 This is a partial enlarged view of part B in the embodiment of this utility model (a schematic diagram of the electrode assembly being welded to the upper surface of the adapter piece);

[0017] Figure 6 This is a third cross-sectional view of the battery device at the position of the power output component in an embodiment of this utility model;

[0018] Figure 7 This is a partial enlarged view of part C in the embodiment of this utility model (a schematic diagram of the welding of the tab assembly and the pole post);

[0019] Figure 8 This is a schematic diagram showing that the length of the electrode tab gradually increases along the stacking direction in an embodiment of this utility model;

[0020] Figure 9 This is a schematic diagram of the overall structure of the electrode lug assembly and electrode post welding in an embodiment of this utility model;

[0021] Figure 10 This is a schematic diagram of the overall structure of the electrode tab in an embodiment of this utility model.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Battery cell; 2. Electrode assembly; 21. Electrode; 22. Collapsing section; 23. Extension section; 3. Power output component; 31. Terminal post; 32. Adapter plate. Detailed Implementation

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] In existing batteries, the tabs 21 generally adopt an equal-length design. When the equal-length tabs 21 are folded together and welded to the adapter plate 32 or terminal post 31, the actual length of the tabs 21 falling on the adapter plate 32 or terminal post 31 at different positions will differ, forming misalignment. When the misalignment is severe, the shorter tabs 21 in the misaligned area may not be able to make effective contact with the welding area, which can easily lead to poor soldering and thus affect the performance of the battery.

[0029] In view of this, the present invention provides a battery device to solve the problem that the tabs 21 of existing batteries have misaligned layers, which makes the tabs 21 prone to poor soldering and affects the performance of the battery.

[0030] The following is combined Figures 1 to 10 The following describes embodiments of the present invention.

[0031] According to an embodiment of the present invention, a battery device is provided. This battery device can store chemical energy and controllably convert the chemical energy into electrical energy. In a recyclable battery device, after discharge, the active materials can be activated by charging for continued use. The battery device includes a casing and battery cells 1 disposed within the casing. The number of battery cells 1 in the battery device can be one or more.

[0032] Specifically, in this embodiment, the battery device includes a power output component 3 and a battery cell 1.

[0033] The power output component 3 is used to electrically connect the battery cell 1 located inside the housing to an external device located outside the housing, such as an adjacent battery or other electrical equipment. The battery device can discharge to the external device through the tab group 2 of the battery cell 1 and the power output component 3, and an external power source can charge the battery device through the power output component 3 and the tab group 2. The power output component 3 can be directly electrically connected to the tab group 2 of the battery cell 1, or it can be electrically connected to the tab group 2 through an adapter 32. The power output component 3 is made of metal materials such as copper, aluminum, aluminum alloy, and copper-aluminum alloy.

[0034] Furthermore, in this embodiment, the power output component 3 can be the terminal post 31 of the battery device or the adapter piece 32 of the battery device. Of course, those skilled in the art can make changes according to the actual situation, as long as the corresponding technical effect can be achieved.

[0035] Furthermore, one end of the adapter piece 32 is used for electrical connection with the tab assembly 2, and the other end is used for electrical connection with the terminal 31, so that the tab assembly 2 and the terminal 31 form a current conduction. The adapter piece 32 may include a positive adapter piece and a negative adapter piece. The positive adapter piece is used to electrically connect the tab assembly 2 of the positive electrode of the cell 1 to the positive terminal 31. The tab assembly 2 of the positive electrode is welded to one end of the positive adapter piece, and the other end of the positive adapter piece is welded to the positive terminal 31.

[0036] Similarly, the negative electrode adapter is used to electrically connect the tab group 2 of the negative electrode of cell 1 to the terminal post 31 of the negative electrode. The tab group 2 of the negative electrode is welded to one end of the negative electrode adapter, and the other end of the negative electrode adapter is welded to the terminal post 31 of the negative electrode.

[0037] The adapter piece 32 can be made of aluminum, copper, or an alloy, or other conductive materials. The specific material of the adapter piece 32 is selected based on the materials of the battery terminal 31 and the tab 21. Generally, the material of the adapter piece 32 must be the same as the material of the battery terminal 21 and the terminal 31 to ensure welding quality.

[0038] Furthermore, in this embodiment, the battery cell 1 is provided with multiple electrode groups 2, which are welded to the power output component 3. Laser welding can be used for the welding method. Of course, this embodiment is merely an example of the welding method between the electrode groups 2 and the power output component 3, and is not intended to limit the method. Those skilled in the art can modify the method according to actual conditions, as long as the same technical effect is achieved.

[0039] Furthermore, in this embodiment, the tab 21 is disposed on one side of the positive or negative current collector of the battery cell 1, and is either separately disposed from or integrally formed with the positive or negative current collector. The tab 21 is electrically connected to the positive or negative current collector to conduct current through the corresponding current collector. The current collector is made of a metal material with good conductivity, such as copper, aluminum, or nickel.

[0040] Furthermore, in this embodiment, each electrode group 2 is provided with at least one electrode tab 21, and the unfolded length of each electrode tab 21 in each electrode group 2 is the same. Each electrode group 2 can be provided with one, two, three, four, five, etc., number of electrode tabs 21. Of course, this embodiment is only an example of the number of electrode tabs 21 in the electrode group 2, 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.

[0041] Furthermore, in this embodiment, when the tab 21 is in a straightened and unfolded state, the distance difference between the ends of two adjacent tab groups 2 is x, and the total number of layers of all tabs 21 in two adjacent tab groups 2 is n. For example, if the first tab group 2 has two tabs 21 and the second tab group 2 has three tabs 21, then the total number of layers of all tabs 21 in two adjacent tab groups 2 is five.

[0042] Furthermore, in this embodiment, the ratio between the distance difference and the total number of layers is x / n, and the ratio x / n is between 0.0125 and 0.4.

[0043] For example, the ratio x / n can be 0.0125, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, or any value from 0.0125 to 0.4. By setting it this way, this embodiment limits the ratio between the distance difference and the total number of layers within a certain range. This ensures that when the layers are converged to the welding area, the ends of all tabs 21 are as close as possible, preventing misalignment. Therefore, during welding, all tabs 21 can be stably welded to the power output component 3, preventing the tabs 21 from having a weak weld due to misalignment. If the ratio is too large, the difference between the ends of adjacent tabs 21 will be too large, easily leading to misalignment. If the ratio is too small, the lengths of adjacent tabs 21 will be too close, easily causing the tabs 21 to tear during convergence. Therefore, this embodiment can ensure the reliability and structural stability of the welding between the tabs 21 and the power output component 3.

[0044] Furthermore, in an alternative implementation, the ratio x / n ranges from 0.04 to 0.2.

[0045] For example, the ratio x / n can be 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.2, etc. This embodiment limits the ratio between the distance difference and the total number of layers to 0.04 to 0.2. This ensures that the ends of all tabs 21 are relatively close when the layers are converged to the welding area, preventing misalignment. This allows for stable welding of all tabs 21 to the power output component 3 during welding, preventing incomplete soldering of the tabs 21 due to misalignment. If the ratio is too large, the difference between the ends of adjacent tabs 21 will be significant, easily leading to misalignment. If the ratio is too small, the lengths of adjacent tabs 21 will be too close, making the tabs 21 prone to tearing during convergence. Therefore, this embodiment can ensure the reliability and structural stability of the welding between the tab 21 and the power output component 3.

[0046] Furthermore, in an optional embodiment, the distance difference x between the ends of two adjacent tab groups 2 ranges from 0.5 mm to 4 mm.

[0047] For example, the distance difference x can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, etc., effectively reducing misalignment. When converged to the welding area, it further ensures that the ends of all tabs 21 are relatively close, preventing misalignment. Therefore, during welding, all tabs 21 can be stably welded to the power output component 3, avoiding the problem of incomplete soldering of tabs 21 due to misalignment.

[0048] Furthermore, in an optional embodiment, the total number of layers n of all electrodes 21 in two adjacent electrode groups 2 ranges from 10 to 40 layers.

[0049] For example, the total number of layers n can be 10, 15, 20, 25, 30, 35, 40, etc. By limiting the total number of layers n of all tabs 21 in two adjacent tab groups 2, mis-layering is effectively reduced, all tabs 21 are stably welded to the power output component 3, and the problem of poor soldering of tabs 21 due to mis-layering is avoided.

[0050] Furthermore, in an optional embodiment, in the plurality of tab groups 2, along the stacking direction of the plurality of tabs 21, the length of the tabs 21 in each tab group 2 gradually increases.

[0051] For example, there are three electrode groups 2, and each electrode group 2 is equipped with four electrodes 21. The electrodes 21 of the first electrode group 2 are the longest, the electrodes 21 of the second electrode group 2 are the second longest, and the electrodes 21 of the third electrode group 2 are the shortest.

[0052] With this configuration, the length of the tab 21 gradually increases along the stacking direction in this embodiment. This is suitable for situations where the tabs are gathered and welded on one side. It ensures that the length of each tab group 2 along the stacking direction increases with position, which exactly matches the distance requirement of the welding area on one side. This avoids the tab 21 on one side being too long to exceed the welding area or too short to make contact, thus improving the reliability of welding on one side.

[0053] Furthermore, in an alternative embodiment, the thickness of each tab assembly 2 is between 3 mm and 15 mm.

[0054] For example, the thickness of each tab group 2 can be 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, 11.5mm, 12mm, 12.5mm, 13mm, 13.5mm, 14mm, 14.5mm, 15mm, etc., to ensure the overcurrent of the tab 21 without misalignment.

[0055] Furthermore, in an optional embodiment, a connection method of tab 21, adapter plate 32, and pole 31 is adopted. Specifically, the power output component 3 includes pole 31 and adapter plate 32, one end of the adapter plate 32 is connected to the pole 31, and the other end of the adapter plate 32 is welded to multiple tab groups 2.

[0056] Furthermore, in an alternative implementation, such as Figure 2 and Figure 3 As shown, multiple electrode assemblies 2 are welded to the lower surface of the adapter piece 32 along the vertical direction.

[0057] Furthermore, in an alternative implementation, such as Figure 4 and Figure 5 As shown, multiple electrode assemblies 2 are welded to the upper surface of the adapter piece 32 along the vertical direction.

[0058] With this configuration, the adapter plate 32 in this embodiment connects the terminal post 31 and the tab 21, ensuring stable conduction between the terminal post 31 and the tab 21, thereby ensuring stable current conduction. Furthermore, it reduces the difficulty of directly connecting the tab 21 and the terminal post 31, improving connection stability. Simultaneously, it can accommodate different specifications of tabs 21 and terminal posts 31, improving the applicability of the materials.

[0059] Furthermore, in an alternative implementation, such as Figure 6 , Figure 7 , Figure 9 As shown, the connection method of the electrode tab 21 and the electrode post 31 is adopted. Specifically, the power output component 3 includes the electrode post 31 welded to multiple electrode tab groups 2.

[0060] With this configuration, the terminal post 31 and the tab 21 are directly connected, eliminating the space occupied by the adapter piece 32 and improving the internal space utilization of the battery. Furthermore, it optimizes the height and direction design of the current conduction path, indirectly increasing the battery's energy density. Simultaneously, it reduces the number of components and simplifies the production process. Moreover, this embodiment can shorten the current conduction path, reduce resistance, and improve overcurrent capability.

[0061] Furthermore, in an alternative embodiment, the width of a single tab 21 is d, the width d ranging from 10 mm to 40 mm.

[0062] For example, the width d can be 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, etc., ensuring the overcurrent of the tab 21 without misalignment. Of course, this embodiment is only an example of the value of the width d, 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.

[0063] By designing the tab 21 within a certain range, this embodiment optimizes the current carrying capacity while ensuring the structural strength of the tab 21, adapting to different charging and discharging current requirements. If the width is too small, the structural strength of the tab 21 will be weak, and it may tear due to battery vibration during actual use. If the width is too large, the tab 21 will occupy too much space, which is not conducive to improving the space utilization rate of the battery.

[0064] Furthermore, in an optional embodiment, the thickness of a single tab 21 is w1, the thickness of the battery cell 1 is w2, and the ratio between the thickness of the single tab 21 and the thickness of the single battery cell 1 is w1 / w2, the ratio w1 / w2 being between 1 / 40 and 1 / 3.

[0065] For example, the ratio w1 / w2 can be 1 / 40, 1 / 35, 1 / 30, 1 / 25, 1 / 20, 1 / 15, 1 / 10, 1 / 9, 1 / 8, 1 / 7, 1 / 6, 1 / 5, 1 / 4, 1 / 3, etc. By setting it this way, this embodiment limits the ratio between the thickness of a single tab 21 and the thickness of the cell 1 within a certain range. This balances the strength of the tab 21 itself, preventing it from tearing due to excessive thinness, which would affect the normal use of the battery device. Simultaneously, it improves the internal space utilization of the battery device, preventing the tab 21 from occupying too much space due to excessive thickness, and to some extent, increasing the energy density of the battery.

[0066] Furthermore, in an alternative embodiment, the thickness w2 of a single cell 1 is between 10 mm and 40 mm.

[0067] For example, the thickness w2 can be 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, etc. Of course, this embodiment is only an example of the value of thickness w2, 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.

[0068] Of course, for wound cells, a battery device usually has two cells 1, and a single cell 1 refers to the thickness of one of the cells 1.

[0069] Furthermore, in an optional embodiment, after the plurality of tabs 2 are folded together, they form a folding section 22 and an extension section 23 along the direction of the power output component 3. The folding section 22 has a bundle-like structure, and the extension section 23 is welded to the power output component 3.

[0070] Specifically, in this embodiment, the gathering section 22 is located on the side close to the battery cell 1. The gathering section 22 has a bundle-like structure and gathers and fixes all the tabs 21. Since the roots of the multiple tabs 21 are evenly distributed on the top of the battery cell 1, when the multiple tabs 21 are gathered, the multiple tabs 21 will gradually move closer to the gathering position, thereby forming a bundle-like structure.

[0071] Of course, this embodiment is merely an example of the shape formed after the multiple tabs 21 are folded together, but it does not limit the scope of the embodiment. The shape formed after the multiple tabs 21 are folded together is related to the specific folding position. Therefore, those skilled in the art can adjust the folding shape according to the actual situation, as long as the same technical effect can be achieved.

[0072] Furthermore, in this embodiment, the extension section 23 is disposed on the side away from the battery cell 1, and the extension section 23 is provided with a welding part on the side close to the electrode post 31, which can be welded to the electrode post 31 by laser welding.

[0073] With this configuration, the tab assembly 2 is gathered together to form a gathered section 22 and an extension section 23. The bundled gathered section 22 can reduce misalignment caused by loose tabs 21. During battery use, the tabs 21 located in the bundled gathered section 22 can reduce stress concentration caused by vibration, thereby reducing the possibility of tearing. At the same time, the extension section 23 is specifically designed for welding to the terminal post 31 or the adapter piece 32, thereby ensuring the stability of the tabs 21 in the welding area and further reducing the risk of poor welding.

[0074] Furthermore, in an optional embodiment, the retracting section 22 is provided with a pre-welding area in which multiple tab assemblies 2 are interconnected.

[0075] With this configuration, the electrode assemblies 2 are connected to each other by pre-welding in this embodiment. This can fix the relative positions of the electrode assemblies 21 before welding them to the power output component 3, avoid misalignment caused by vibration or operation during the folding process, ensure the accurate position of the ends of each electrode assembly 2 during welding, and further improve welding reliability.

[0076] 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, include: Power output component (3); The battery cell (1) is equipped with multiple electrode groups (2); Multiple electrode groups (2) are welded to the power output component (3); each electrode group (2) is provided with at least one electrode (21), and each electrode (21) has the same unfolded length; When the tabs (21) are in a stretched and unfolded state, the distance difference between the ends of two adjacent tab groups (2) is x, and the total number of layers of all tabs (21) in two adjacent tab groups (2) is n. The ratio between the distance difference and the total number of layers is x / n, and the ratio x / n is between 0.0125 and 0.

4.

2. The battery device according to claim 1, characterized in that, The ratio x / n ranges from 0.04 to 0.

2.

3. The battery device of claim 1, wherein The distance difference x between the ends of two adjacent tabs (2) ranges from 0.5 mm to 4 mm.

4. The battery device of claim 1, wherein The total number of layers n of all electrodes (21) in two adjacent electrode groups (2) ranges from 10 to 40 layers.

5. The battery device according to any one of claims 1 to 4, characterized by, In the multiple electrode groups (2), along the stacking direction of the multiple electrodes (21), the length of the electrodes (21) in each electrode group (2) gradually increases.

6. The battery device of claim 5, wherein The thickness of each tab assembly (2) is between 3 mm and 15 mm.

7. The battery device according to any one of claims 1 to 4, characterized by The power output component (3) includes: pole (31), The adapter piece (32) is connected at one end to the pole post (31) and at the other end to the multiple tabs (2).

8. The battery device of claim 7, wherein, Along the vertical direction, multiple electrode assemblies (2) are welded to the lower surface of the adapter piece (32).

9. The battery device of claim 7, wherein Along the vertical direction, multiple electrode assemblies (2) are welded to the upper surface of the adapter plate (32).

10. The battery device according to any one of claims 1 to 4, characterized by The power output component (3) includes: The pole (31) is welded to multiple tabs (2).

11. The battery device according to any one of claims 1 to 4, characterized by The width of a single tab (21) is d, which ranges from 10 mm to 40 mm.

12. The battery device according to any one of claims 1 to 4, characterized by The thickness of a single tab (21) is w1, the thickness of a single cell (1) is w2, and the ratio between the thickness of a single tab (21) and the thickness of a cell (1) is w1 / w2, the ratio w1 / w2 being between 1 / 40 and 1 / 3.

13. The battery device of claim 12, wherein, The thickness w2 of a single cell (1) is between 10 mm and 40 mm.

14. The battery device according to any one of claims 1 to 4, wherein After being folded together, the multiple electrode groups (2) form a folding section (22) and an extension section (23) along the direction of the power output component (3); the folding section (22) has a bundle-like structure, and the extension section (23) is welded to the power output component (3).

15. The battery device of claim 14, wherein, The retractable section (22) is provided with a pre-welding area in which multiple tab assemblies (2) are interconnected.

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