Battery device

Abstract

This utility model relates to the field of battery technology, specifically to a battery device. The battery device includes: a terminal post, which is welded to one side of an adapter plate; a solder mark is provided between the terminal post and the adapter plate; a battery cell, which has a tab assembly, with one end of the tab assembly away from the battery cell welded to the other side of the adapter plate; after multiple tabs are gathered together, in the tab lead-out direction, the first length from the longest tab to the solder mark is L1, and the second length from the shortest tab to the solder mark is L2; ​​the first spacing K1 = L2 - L1, and the units of the first length L1 and the second length L2 are mm; and the range of K1 / L1 is between 0.625 and 2. This embodiment limits the range of K / L1 to a certain range, which can reduce the difference between the end of the longest tab and the end of the shortest tab, thereby reducing the misalignment of the tabs, avoiding poor soldering or structural damage caused by positional deviation, while also ensuring the stability of the current conduction path.

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] The electrode post is welded to one side of the adapter plate; a solder mark is provided between the electrode post and the adapter plate;

[0007] The battery cell is provided with a tab assembly, which is composed of multiple tabs; the end of the tab assembly away from the battery cell is welded to the other side of the adapter plate.

[0008] After multiple tabs are gathered together, in the direction of tab lead-out, the first length from the longest tab to the solder mark is L1, and the second length from the shortest tab to the solder mark is L2; ​​the difference between the first length L1 and the second length L2 is the first spacing K1, the first spacing K1 = L2 - L1, and the units of the first length L1 and the second length L2 are mm.

[0009] Furthermore, the range of K1 / L1 is between 0.625 and 2.

[0010] Beneficial Effects: This embodiment limits the range of K1 / L1 to a certain extent, which can reduce the gap between the end of the longest tab and the end of the shortest tab, thereby reducing tab misalignment and avoiding poor soldering or structural damage caused by positional deviation, while also ensuring the stability of the current conduction path. If the ratio is too large, the distance between the shortest and longest tabs will be too large, easily leading to severe tab misalignment. If the ratio is too small, the distance between the shortest and longest tabs will be too small, resulting in less tab redundancy during closing, which may cause the short tab to tear. 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 showing the connection between the battery cell, adapter plate, and terminal post before assembly in an embodiment of this utility model;

[0013] Figure 2 This is a schematic diagram showing the connection between the assembled battery cell, adapter plate, and terminal post in an embodiment of this utility model.

[0014] Figure 3 This is a schematic diagram of the overall structure of the electrode tab in an embodiment of this utility model.

[0015] Explanation of reference numerals in the attached figures:

[0016] 1. Terminal post; 2. Adapter plate; 3. Solder mark; 4. Battery cell; 41. Electrode assembly; 411. Gathering area; 42. Pre-welded section. Detailed Implementation

[0017] 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.

[0018] 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 ease of description and simplification of 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.

[0019] 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.

[0020] 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.

[0021] The tabs of existing batteries generally adopt an equal-length design. When the equal-length tabs are folded together and welded to the adapter plate 2 or the terminal post 1, the actual length of the tabs falling on the adapter plate 2 or the terminal post 1 at different positions will be different, forming a misalignment.

[0022] 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.

[0023] 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.

[0024] The following is combined with Figures 1 to 3 The following describes embodiments of the present invention.

[0025] According to an embodiment of this utility model, 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 4 disposed within the casing. The number of battery cells 4 in the battery device can be one or more. The battery device includes terminals 1, adapter plates 2, and battery cells 4.

[0026] Specifically, in this embodiment, the terminal 1 is used to electrically connect the battery cell 4 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 assembly 41 of the battery cell 4 and the terminal 1, and an external power source can charge the battery device through the terminal 1 and the tab assembly 41. The terminal 1 can be directly electrically connected to the tab assembly 41 of the battery cell 4, or it can be electrically connected to the tab assembly 41 through an adapter 2. The terminal 1 is made of metal materials including but not limited to copper, aluminum, aluminum alloy, and copper-aluminum alloy.

[0027] Furthermore, one end of the adapter piece 2 is used for electrical connection with the tab assembly 41, and the other end is used for electrical connection with the terminal post 1, so that the tab assembly 41 and the terminal post 1 form a current conduction. The adapter piece 2 may include a positive adapter piece and a negative adapter piece. The positive adapter piece is used to electrically connect the tab assembly 41 of the positive electrode of the battery cell 4 to the terminal post 1 of the positive electrode. The tab assembly 41 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 terminal post 1 of the positive electrode.

[0028] Similarly, the negative electrode adapter is used to electrically connect the tab assembly 41 of the negative electrode of the cell 4 to the terminal post 1 of the negative electrode. The tab assembly 41 of the negative electrode is welded to one end of the negative electrode adapter, and the other end of the negative electrode adapter 2 is welded to the terminal post 31 of the negative electrode.

[0029] The adapter piece 2 can be made of aluminum, copper, or an alloy, or other conductive materials. The specific material of the adapter piece 2 is selected based on the materials of the battery terminal 1 and the tab. Generally, the material of the adapter piece 2 must be the same as the material of the battery terminal and the terminal 1 to ensure welding quality.

[0030] In this embodiment, the pole post 1 and the adapter piece 2 are connected by welding on one side, and a solder mark 3 is provided between the pole post 1 and the adapter piece 2.

[0031] Furthermore, in this embodiment, the battery cell 4 is provided with a tab assembly 41, which is composed of multiple tabs, and one end of the tab assembly 41 away from the battery cell 4 is welded to the other side of the adapter piece 2.

[0032] Furthermore, in this embodiment, the tab is disposed on one side of the positive or negative current collector of the battery cell 4, and is either separately disposed from or integrally formed with the positive or negative current collector. The tab 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.

[0033] In this embodiment, the unfolded lengths of the multiple tabs can be the same or different. Of course, those skilled in the art can make changes according to the actual situation. This embodiment is merely an example and is not intended to limit the scope, as long as the same technical effect can be achieved.

[0034] Furthermore, in this embodiment, after the multiple tabs are gathered together, in the direction of tab lead-out, the first length from the longest tab to the solder mark 3 is L1, and the second length from the shortest tab to the solder mark 3 is L2; ​​the difference between the first length L1 and the second length L2 is the first spacing K1, the first spacing K1 = L2 - L1, and the units of the first length L1 and the second length L2 are mm.

[0035] Furthermore, the range of K1 / L1 is between 0.625 and 2.

[0036] For example, K1 / L1 can be any value from 0.625, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, or 0.625 to 2. By setting it in this way, this embodiment limits the range of K1 / L1 to a certain range, which can reduce the gap between the end of the longest tab and the end of the shortest tab, thereby reducing tab misalignment and avoiding poor soldering or structural damage caused by positional deviations, while also ensuring the stability of the current conduction path. If the ratio is too large, the distance between the shortest and longest tabs will be too large, easily leading to severe tab misalignment. If the ratio is too small, the distance between the shortest and longest tabs will be too small, resulting in less tab redundancy during closing, which may cause the short tab to tear.

[0037] Furthermore, in an alternative embodiment, the first spacing K1 ranges from 0.5 mm to 4 mm.

[0038] For example, K1 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, etc., ensuring that the difference between the end of the longest tab and the end of the shortest tab is within a reasonable range. This reduces tab misalignment and avoids poor soldering or structural damage due to positional deviations, while also ensuring the stability of the current conduction path. If the ratio is too large, the distance between the shortest and longest tabs will be too large, easily leading to severe tab misalignment. If the ratio is too small, the distance between the shortest and longest tabs will be too small, resulting in less tab redundancy during closing, which may cause the short tab to tear.

[0039] Furthermore, in an alternative embodiment, the first length L1 ranges from 2 mm to 8 mm.

[0040] For example, L1 can be 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, etc. By setting it in this way, this embodiment limits the first length L1 to a certain range, ensuring that the longest tab can accurately fit the solder mark 3 area, allowing the shortest tab to effectively contact the adapter piece 2, thereby guaranteeing effective welding between the shortest tab and the adapter piece 2 and improving the overall welding reliability of the tab assembly 41. If the first length is too large, the end of the longest tab will be too far from the solder mark 3, making it impossible for the shortest tab to effectively contact the adapter piece 2, resulting in a poor weld. If the first length is too small, the shortest tab may be too close to the solder mark 3, which may adversely affect the solder mark 3 or the pole piece 1 during welding.

[0041] Furthermore, in an alternative embodiment, the second length L2 ranges from 2.5 mm to 12 mm.

[0042] For example, L2 can be 2.5mm, 3mm, 3.5mm, 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, etc. By setting it in this way, this embodiment limits the second length to a certain range, ensuring that the shortest tab and the adapter piece 2 can effectively contact each other, thereby guaranteeing effective welding of the shortest tab and the adapter piece 2 and improving the overall welding reliability of the tab assembly 41. If the second length is too large, the shortest tab and the adapter piece 2 may not make effective contact, resulting in a cold solder joint. If the second length is too small, the shortest tab and the solder mark 3 will be too close, which may adversely affect the solder mark 3 or the pole post 1 during welding.

[0043] Furthermore, in an optional embodiment, the total number of electrode layers in the electrode assembly 41 is n, the first spacing K1 has a ratio K1 / n to the total number of layers n, and K1 / n ranges from 0.0125 to 0.4.

[0044] For example, K1 / n can be 0.0125, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, etc. This embodiment ensures that the ends of all tabs are as close as possible when gathered to the welding area, preventing misalignment. This allows for stable welding of all tabs to the electrode post 1 during welding, preventing incomplete soldering due to misalignment. Limiting the range of K1 / n in this embodiment balances the risks of misalignment and compression of tabs with different numbers of layers, adapting to the design requirements of multi-layer tab assemblies 41 and improving structural stability. If K1 / n is too large, it indicates that the distance between the ends of the tabs per unit layer is too large, resulting in severe overall misalignment after gathering, which may cause some tabs to fail to contact the solder mark 3. If K1 / n is too small, the spacing between units of layers will be too small, and the tabs will squeeze each other when they close, which may cause the short tabs to tear.

[0045] Furthermore, in this embodiment, the total number of electrode layers n in the electrode assembly 41 ranges from 10 to 40 layers. For example, the total number of electrode layers can be 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, etc. Of course, this embodiment is merely an example of the total number of electrode layers, but it is not a limitation. Those skilled in the art can make changes according to actual circumstances, as long as the same technical effect is achieved.

[0046] Furthermore, in an optional embodiment, the tab assembly 41 is provided with a folding area 411, and the multiple tabs form a bundle structure after being folded together.

[0047] Specifically, in this embodiment, the gathering area 411 is located on the side close to the battery cell 4. After being gathered, the multiple tabs form a bundle structure, and all the tabs are gathered and fixed. Since the roots of the multiple tabs are evenly distributed on the top of the battery cell 4, when the multiple tabs are gathered, the multiple tabs will gradually move closer to the gathering position, thereby forming a bundle structure.

[0048] With this configuration, multiple tabs in this embodiment are bundled together to form a bundle structure. This bundle structure reduces misalignment caused by loose tabs and prevents individual tabs from deviating from the solder mark 3 due to shaking. At the same time, the bundle structure concentrates the force on the tabs, reduces positional deviation during welding, improves the overall stability of the welding between the tab assembly 41 and the adapter piece 2, and facilitates subsequent assembly.

[0049] Furthermore, in an optional embodiment, after assembly, the height of the folding area 411 in the vertical direction is a first height w1, and the height between the battery cell 4 and the adapter piece 2 is a second height w2. The first height w1 and the second height w2 have a ratio w1 / w2, and the range of w1 / w2 is between 0.02 and 6.

[0050] For example, w1 / w2 can be 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, etc. Of course, this embodiment is merely an example of the possible values ​​of w1 / w2, and does not impose any limitations on them. Those skilled in the art can modify them according to actual circumstances, as long as the same technical effect is achieved.

[0051] With this configuration, the range of w1 / w2 in this embodiment is limited to a certain range, which can improve the structural stability of the gathering area 411, ensure that the tab assembly 41 has sufficient height to ensure the bundle shape, and at the same time improve the space utilization rate inside the battery device, ensuring that the effective space inside the battery is maximized without affecting the function of the tab.

[0052] Furthermore, in an alternative implementation, the first height w1 ranges from 0.1 mm to 3 mm.

[0053] For example, the first height w1 can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, etc. Of course, this embodiment is merely an example of the possible values ​​for the first height w1, 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.

[0054] Furthermore, in an alternative embodiment, the second height w2 ranges from 0.5 mm to 5 mm.

[0055] For example, the second height w2 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc. Of course, this embodiment is merely an example of the possible values ​​for the second height w2, 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.

[0056] Furthermore, in an optional embodiment, the gathering area 411 is provided with a pre-welded portion 42, that is, after the multiple tabs are gathered, they are pre-welded and fixed to form the pre-welded portion 42. Along the extending direction of the tab assembly 41, a second spacing K2 is provided between the pre-welded portion 42 and the end of the longest tab, the second spacing K2 being between 0.3mm and 5mm.

[0057] For example, the second spacing K2 can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc. Of course, this embodiment is merely an example of the possible values ​​for the second spacing K2, 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.

[0058] With this configuration, the second spacing K2 in this embodiment is limited to a certain range, ensuring that the pre-welding stabilizes the bundled structure without interfering with the end welding, thus improving the positional accuracy and welding reliability of the tab assembly 41 after it is retracted. If K2 is too small, the pre-welding position will be too close to the end of the tab, which may affect the welding between the end and the adapter piece 2, such as the pre-welding marks interfering with the solder mark 3. If K2 is too large, the pre-welding position will be too far away, and the end of the tab cannot be effectively fixed, and the tab may still be loose and misaligned after it is retracted.

[0059] Furthermore, in an optional embodiment, the adapter piece 2 is provided with an embedding groove, and the end of at least the longest tab in the tab assembly 41 extends into the embedding groove and is connected to the adapter piece 2.

[0060] With this configuration, this embodiment incorporates an embedding groove, which limits the lateral displacement of the tab ends and prevents the ends from deviating from the solder mark 3 due to misalignment. Simultaneously, the space within the groove guides the tab ends to be concentrated, ensuring that each tab can contact the welding area of ​​the adapter piece 2, reducing the risk of incomplete soldering, and enhancing the connection strength between the tabs and the adapter piece 2.

[0061] Furthermore, in an optional embodiment, the tabs extending into the embedding groove in the tab assembly 41 are interference-fitted with the embedding groove.

[0062] With this configuration, this embodiment utilizes an interference fit between the tab and the insertion groove to eliminate the gap between the tab and the groove wall, preventing the tab from shifting position due to vibration and expansion during charging and discharging during battery use, thus ensuring stable welding position over long-term use. Simultaneously, the interference fit increases the contact area between the tab and the adapter piece 2, improving current conduction efficiency, while also enhancing structural integrity and reducing the risk of tab detachment.

[0063] 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: The pole (1) is welded to one side of the adapter plate (2); a solder mark (3) is provided between the pole (1) and the adapter plate (2); The battery cell (4) is provided with a tab assembly (41), which is composed of multiple tabs; the end of the tab assembly (41) away from the battery cell (4) is welded to the other side of the adapter piece (2); After the multiple electrodes are gathered together, in the direction of the electrodes being led out, the first length from the longest electrode to the solder mark (3) is L1, and the second length from the shortest electrode to the solder mark (3) is L2; ​​the difference between the first length L1 and the second length L2 is the first spacing K1, the first spacing K1 = L2 - L1, and the units of the first length L1 and the second length L2 are mm. Furthermore, the range of K1 / L1 is between 0.625 and 2.

2. The battery device according to claim 1, characterized by The first spacing K1 ranges from 0.5 mm to 4 mm.

3. The battery device of claim 1, wherein The first length L1 ranges from 2 mm to 8 mm.

4. The battery device of claim 1, wherein The second length L2 ranges from 2.5 mm to 12 mm.

5. The battery device according to any one of claims 1 to 4, characterized by, The total number of electrode layers in the electrode assembly (41) is n, and the ratio between the first spacing K1 and the total number of layers n is K1 / n; and the range of K1 / n is between 0.0125 and 0.

4.

6. The battery device of claim 5, wherein, The total number of electrode layers n in the electrode assembly (41) ranges from 10 to 40 layers.

7. The battery device according to any one of claims 1 to 4, wherein The electrode assembly (41) is provided with a gathering area (411), and multiple electrodes form a bundle structure after being gathered.

8. The battery device of claim 7, wherein, After assembly, the height of the folding area (411) in the vertical direction is the first height w1, and the height between the battery cell (4) and the adapter piece (2) is the second height w2. The first height w1 and the second height w2 have a ratio w1 / w2; and the range of w1 / w2 is between 0.02 and 6.

9. The battery device of claim 8, wherein, The first height w1 ranges from 0.1 mm to 3 mm.

10. The battery device of claim 8, wherein, The second height w2 ranges from 0.5 mm to 5 mm.

11. The battery device according to any one of claims 8 to 10, characterized by, The gathering area (411) is provided with a pre-welded part (42). Along the extension direction of the tab assembly (41), a second spacing K2 is provided between the pre-welded part (42) and the end of the longest tab. The second spacing K2 is in the range of 0.3 mm to 5 mm.

12. The battery device according to any one of claims 1 to 4, characterized by The adapter piece (2) is provided with an embedding groove, and the end of at least the longest electrode in the electrode assembly (41) extends into the embedding groove and is connected to the adapter piece (2).

13. The battery device of claim 12, wherein, The electrode extending into the embedding groove in the electrode assembly (41) is interference-fitted with the embedding groove.

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