battery

Abstract

This utility model discloses a battery, comprising: a casing with a receiving cavity; a battery cell disposed within the receiving cavity; a first tab, one end of which is welded to the battery cell and the other end of which extends through the casing; and a second tab, one end of which is welded to the battery cell and the other end of which extends through the casing, wherein the second tab has the opposite polarity to the first tab; wherein at least one of the first tab and the second tab has a bending region between its two ends, the bending region being located within the receiving cavity, and a rotating structure capable of rotatability under force is provided at the bending region. When the battery of this utility model undergoes conventional reliability tests such as roller tests and drop tests, the tabs are less prone to breakage, preventing internal circuit breaks within the battery cell and ensuring the integrity and effectiveness of the battery cell during the testing process.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to a battery. Background Technology

[0002] Lithium batteries are batteries that contain lithium (including metallic lithium, lithium alloys, lithium ions, and lithium polymers) in their electrochemical system and are widely used in consumer products and other fields.

[0003] Among lithium batteries on the market, the mainstream cell types include stacked cells and wound cells. Stacked cells are formed by stacking positive and negative electrodes and separators in sequence, which has advantages such as regular structure and low internal resistance. Wound cells are formed by winding positive and negative electrodes and separators in sequence, which has certain advantages in terms of production efficiency and cost control, and therefore occupies a considerable share of the market.

[0004] To achieve electrical connection between the battery cell and the external circuitry, the battery cell is typically welded with positive and negative tabs, which are bent and extended from one end of the casing. During product quality inspection, when performing routine reliability tests such as roller tests and drop tests on the battery cell, the assembly gap between the battery cell and the casing causes the battery cell to shake due to inertia during the test, which exerts a continuous pulling force on the tabs. Especially at the bending points of the tabs, this external force can cause localized stress concentration. As the test intensity increases, the tabs are very prone to breakage at the bending points, leading to an open circuit in the internal circuitry of the battery cell, causing cell failure, and seriously affecting the reliability and lifespan of the lithium battery product. Utility Model Content

[0005] The main purpose of this invention is to propose a battery that aims to solve the technical problem that the tabs of the battery cells are prone to breakage and cause cell failure during conventional reliability tests such as roller tests and drop tests.

[0006] To achieve the above objectives, this utility model proposes a battery, which includes:

[0007] The housing has a receiving cavity;

[0008] The battery cell is disposed within the accommodating cavity;

[0009] The first tab has one end welded to the battery cell and the other end protruding from the housing;

[0010] The second electrode has one end welded to the battery cell and the other end protruding from the housing. The polarity of the second electrode is opposite to that of the first electrode.

[0011] The first electrode and the second electrode have a bending area between their two ends, the bending area is located within the accommodating cavity, and the bending area is provided with a rotating structure that can be rotated under force.

[0012] Optionally, the rotating structure is a hinge structure;

[0013] The first electrode and the second electrode have a connecting portion between their two ends. The connecting portions are respectively provided at opposite ends of the bending area, and adjacent connecting portions are connected by the hinge structure.

[0014] Optionally, the hinge structure includes a connecting shaft, a first hinge portion and a second hinge portion, wherein both the first hinge portion and the second hinge portion are sleeved on the connecting shaft and can rotate around the connecting shaft;

[0015] One of the two adjacent connecting parts is connected to the first hinge part, and the other is connected to the second hinge part.

[0016] Optionally, one side of the first hinge portion is provided with a plurality of spaced-apart first bushing portions, and one side of the second hinge portion is provided with a plurality of spaced-apart second bushing portions.

[0017] Multiple first bushing portions and multiple second bushing portions are alternately sleeved on the connecting shaft along the axial direction of the connecting shaft.

[0018] Optionally, the hinge structure includes multiple connecting rings, a third hinge portion and a fourth hinge portion, wherein the multiple connecting rings are spaced apart along the width direction of the tab and pass through the third hinge portion and the fourth hinge portion;

[0019] One of the two adjacent connecting parts is connected to the third hinge part, and the other is connected to the fourth hinge part.

[0020] Optionally, the hinge structure includes multiple links, which are sequentially hinged in a straight line.

[0021] One of the two adjacent connecting parts is connected to the link at one end of the hinge structure, and the other is connected to the link at the other end of the hinge structure.

[0022] Optionally, the rotating structure consists of two bent layers spaced apart along the thickness direction of the tab.

[0023] Optionally, the number of bending areas is set to two, and the two bending areas are spaced apart along the thickness direction of the battery and have different bending directions.

[0024] Optionally, the distance between the end of the battery cell with the first and second tabs welded on it and the top inner wall of the housing is L, satisfying: 0.5mm≤L≤1.5mm.

[0025] Optionally, the battery cell is a wound battery cell, which includes a positive electrode sheet, a separator, and a negative electrode sheet that are stacked and wound around each other. The first tab is welded to one of the positive electrode sheet and the negative electrode sheet, and the second tab is welded to the other of the positive electrode sheet and the negative electrode sheet; or...

[0026] The battery cell is a laminated battery cell, which includes a positive electrode, a separator, and a negative electrode arranged alternately in sequence. The first tab is welded to one of the positive electrode and the negative electrode, and the second tab is welded to the other of the positive electrode and the negative electrode.

[0027] This utility model battery features a rotating structure in the tab bending area that can rotate under stress. When the battery undergoes conventional reliability tests such as roller tests and drop tests, the tensile force generated by the cell's shaking due to inertia will act on the tab. The rotating structure in the tab bending area can rotate flexibly under stress, converting the tensile force into rotational kinetic energy. This effectively disperses the stress at the tab bending point, significantly reducing the risk of the tab breaking at the bending position, avoiding internal circuit breakage of the cell, and ensuring the integrity and effectiveness of the cell during the testing process. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the battery structure in one embodiment of the present invention;

[0029] Figure 2 for Figure 1 A schematic diagram of the battery structure from another perspective in the embodiment;

[0030] Figure 3 This is a schematic diagram of the hinge structure in one embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the hinge structure in another embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of the hinge structure in another embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of the battery structure in another embodiment of the present invention;

[0034] Figure 7 for Figure 6 Enlarged view of point C in the middle;

[0035] Label Explanation:

[0036]

[0037]

[0038] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0039] The solutions in 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 a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0040] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0041] It should also be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0042] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0043] This utility model provides a battery, referring to... Figure 1 and Figure 2 The battery includes:

[0044] The housing 110 has a receiving cavity 101;

[0045] The battery cell 120 is disposed within the accommodating cavity 101;

[0046] The first tab 130 is welded to the battery cell 120 at one end and extends out of the housing 110 at the other end;

[0047] The second tab 140 is welded to the battery cell 120 at one end and extends out of the housing 110 at the other end. The polarity of the second tab 140 is opposite to that of the first tab 130.

[0048] Among them, at least one of the first electrode 130 and the second electrode 140 has a bending region 10Q between its two ends. The bending region 10Q is located in the accommodating cavity 101, and a rotating structure that can be rotated under force is provided at the bending region 10Q.

[0049] In this embodiment, as Figure 1 and Figure 2 As shown, the battery (which can be a lithium battery) casing 110 can be an aluminum-plastic film, forming a closed accommodating cavity 101 inside, providing a stable installation space for the battery cell 120. The battery cell 120 can be stacked or wound, depending on actual needs, and is placed inside the accommodating cavity 101.

[0050] The first tab 130 and the second tab 140 are made of a metal material with good conductivity and are welded to the positive and negative terminals of the battery cell 120, respectively, to achieve electrical connection between the battery cell 120 and the external circuit. The tabs extend from the pre-set perforations or gaps in the housing 110, and at least one tab has a bending region 10Q inside the housing 110. That is, either the first tab 130, the second tab 140, or both the first tab 130 and the second tab 140 may have bending regions 10Q. Furthermore, the number of bending regions 10Q on the tabs is not limited and can be set according to actual needs.

[0051] The presence of the bending region 10Q provides the tab with a certain degree of flexibility when connecting the battery cell 120 to the outside of the housing 110. The rotating structure provided in the bending region 10Q can be a simple rotating shaft structure, in which the tab is fitted onto the rotating shaft so that the tab can rotate around the rotating shaft, or it can be other structures, which will not be described in detail here.

[0052] When performing conventional reliability tests such as roller tests and drop tests on the battery of this embodiment, due to the assembly gap between the cell 120 and the casing 110, the cell 120 will shake under inertia, thereby generating a pulling force on the tab. At this time, the tab bending area 10Q with the rotating structure will rotate when subjected to the pulling force, converting the pulling force into rotational kinetic energy, causing the tab to deform or move adaptively. For example, in the roller test, the continuous rolling of the cell 120 causes the tab to be subjected to pulling forces in different directions. The rotating structure of the bending area 10Q will rotate in real time according to the direction of the force, so that the stress at the bending point of the tab can be evenly distributed, avoiding stress concentration at a certain point or area at the bending point, thereby effectively reducing the risk of the tab breaking at the bending position, ensuring the continuity of the internal circuit of the cell 120, and maintaining the normal working state of the cell 120 during the test.

[0053] Furthermore, this embodiment achieves technological improvements without altering the basic structure and manufacturing process of the lithium battery. It preserves the original performance advantages of cell 120 without significantly increasing production costs, demonstrating good economic efficiency and practicality. This is conducive to enhancing the competitiveness of lithium battery products in the market and promoting the further development of the lithium battery technology field.

[0054] In some embodiments, refer to Figure 2 and Figure 3 The rotating structure is a hinge structure 10;

[0055] At least one of the first electrode tab 130 and the second electrode tab 140 has a connecting portion 20B between its two ends. The two opposite ends of the bending region 10Q are respectively provided with connecting portions 20B, and adjacent connecting portions 20B are connected by a hinge structure 10.

[0056] In this embodiment, as Figure 2 As shown, the connecting part 20B is a component of the electrode tab and is made of metal. Multiple connecting parts 20B are provided, arranged sequentially along the length of the electrode tab, with a bending area 10Q corresponding to any two adjacent connecting parts 20B. The hinge structure 10 can be composed of multiple (e.g., two) metal sheets hinged together. Each metal sheet has a special conductive treatment on its surface to ensure rotational flexibility without affecting the overall conductivity of the electrode tab. Each connecting part 20B can be connected to or integrally formed with the corresponding metal sheet in the hinge structure 10, allowing adjacent connecting parts 20B to rotate relative to each other via the hinge structure 10.

[0057] When the battery undergoes reliability tests such as roller tests and drop tests, the tensile force generated by the shaking of the cell 120 is transmitted to the tab bending area 10Q. At this time, the adjacent connecting parts 20B connected by the hinge structure 10 will rotate relative to each other according to the direction of the force. For example, when the cell 120 rolls in a certain direction during the roller test, the tab is subjected to an oblique tensile force. The metal pieces in the hinge structure 10 will rotate relative to each other to adjust the angle, decomposing the oblique tensile force into components in multiple directions, making the stress distribution in the bending area 10Q more uniform.

[0058] The hinge structure 10 can take various structural forms, such as:

[0059] In some embodiments, refer to Figure 3 The hinge structure 10 includes a connecting shaft 11, a first hinge part 12 and a second hinge part 13. The first hinge part 12 and the second hinge part 13 are both sleeved on the connecting shaft 11 and can rotate around the connecting shaft 11.

[0060] One of the two adjacent connecting parts 20B is connected to the first hinge part 12, and the other is connected to the second hinge part 13.

[0061] In this embodiment, the hinge structure 10 is composed of a single connecting shaft 11 and two hinge parts. Specifically, the hinge structure 10 includes a connecting shaft 11, a first hinge part 12, and a second hinge part 13. Both the first hinge part 12 and the second hinge part 13 are sleeved on the connecting shaft 11 and can rotate around the connecting shaft 11. Furthermore, in the connection relationship of the tab structure, one of the two adjacent connecting parts 20B is connected to the first hinge part 12, and the other is connected to the second hinge part 13. This structural design provides the first hinge part 12 and the second hinge part 13 with the connecting shaft 11 as the rotation axis, so that the adjacent connecting parts 20B can rotate relative to each other with the connecting shaft 11 as the center. Compared with the traditional hinge structure 10, its rotation structure is simpler, and its rotation stability and controllability are higher, further improving the ability of the tab to cope with external forces in the bending area 10Q.

[0062] When the battery is subjected to reliability tests such as drum tests and drop tests, the external force generated by the shaking of the cell 120 acts on the tabs. Based on the working principle of this new hinge structure 10, the force transmission and dispersion process is more efficient. For example, in a drop test, the battery is instantly subjected to a vertical impact force, which causes the cell 120 to shake and exert a pulling force on the tabs. At this time, the adjacent connecting parts 20B connected to the first hinge part 12 and the second hinge part 13 will rotate relative to each other around the connecting shaft 11 due to the force.

[0063] The rotation of the first hinge portion 12 and the second hinge portion 13 on the connecting shaft 11 can dynamically adjust the angle between adjacent connecting portions 20B according to the direction and magnitude of the tensile force. When the direction of the tensile force changes, such as when the battery rolls in the drum and generates an oblique tensile force, the first hinge portion 12 and the second hinge portion 13 can rotate in different directions respectively, decomposing the tensile force in a single direction into components in multiple directions, so that the stress in the bending area 10Q is no longer concentrated at a certain point or in a certain local area, but is evenly distributed on the entire tab structure.

[0064] In some embodiments, refer to Figure 3 The first hinge portion 12 has a plurality of spaced first bushing portions 121 on one side, and the second hinge portion 13 has a plurality of spaced second bushing portions 131 on one side.

[0065] Multiple first bushing portions 121 and multiple second bushing portions 131 are alternately sleeved on the connecting shaft 11 along the axial direction of the connecting shaft 11.

[0066] In this embodiment, as Figure 3As shown, the first hinge portion 12 is rotatably fitted onto the connecting shaft 11 via a plurality of first bushing portions 121, and the second hinge portion 13 is rotatably fitted onto the connecting shaft 11 via a plurality of second bushing portions 131. The specific number of first bushing portions 121 and second bushing portions 131 can be set according to actual needs, and this embodiment does not limit this. Furthermore, along the axial direction of the connecting shaft 11, the plurality of first bushing portions 121 and the plurality of second bushing portions 131 are alternately fitted onto the connecting shaft 11, that is, a second bushing portion 131 is accommodated between any two adjacent first bushing portions 121, and correspondingly, a first bushing portion 121 is accommodated between any two adjacent second bushing portions 131.

[0067] By alternating the arrangement of multiple bushings, the connection between the first hinge portion 12 and the second hinge portion 13 on the connecting shaft 11 is made more stable, and the force is more evenly distributed during rotation, effectively improving the reliability of the hinge structure 10. At the same time, this structural design increases the flexibility of relative rotation between the first hinge portion 12 and the second hinge portion 13, further enhancing the ability of the tab bending area 10Q to withstand external forces of different directions and intensities, providing more reliable protection for the tab during battery reliability testing and actual use.

[0068] In some embodiments, refer to Figure 4 The hinge structure 10 includes multiple connecting rings 14, a third hinge portion 15 and a fourth hinge portion 16. The multiple connecting rings 14 are arranged at intervals along the width direction of the tab and pass through the third hinge portion 15 and the fourth hinge portion 16.

[0069] One of the two adjacent connecting parts 20B is connected to the third hinge part 15, and the other is connected to the fourth hinge part 16.

[0070] In this embodiment, as Figure 4 As shown, the hinge structure 10 is composed of multiple connecting rings 14 and a double hinge portion. Specifically, the hinge structure 10 includes multiple connecting rings 14, a third hinge portion 15, and a fourth hinge portion 16. The multiple connecting rings 14 are arranged at intervals along the width direction of the tab and simultaneously pass through the third hinge portion 15 and the fourth hinge portion 16, forming a stable connection relationship. In the tab connection structure, one of two adjacent connecting portions 20B is fixedly connected to the third hinge portion 15, and the other is fixedly connected to the fourth hinge portion 16. This structure, through the distribution of multiple connecting rings 14 in the width direction of the tab, enables multi-dimensional flexible rotation between the third hinge portion 15 and the fourth hinge portion 16.

[0071] When the battery undergoes reliability tests such as tumbling and drop tests, the external force generated by the shaking of the cell 120 is transmitted to the tabs. At this time, the hinge structure 10 of this embodiment plays a crucial role. Taking the drop test as an example, at the moment the battery falls vertically, the cell 120 generates a large vertical pulling force on the tabs due to inertial shaking. This force acts on the connecting part 20B connected to the third hinge part 15 and the fourth hinge part 16. Since the multiple connecting rings 14 are distributed at intervals along the width direction of the tabs, the vertical pulling force acts on each connecting ring 14 simultaneously. The multiple connecting rings 14 work together to distribute the force to different positions of the third hinge part 15 and the fourth hinge part 16.

[0072] When the direction of the external force changes, such as when the battery is subjected to an oblique pulling force during the drum test, the third hinge 15 and the fourth hinge 16 can rotate in multiple dimensions in the tab width direction with the connecting ring 14 as the fulcrum.

[0073] The design of multiple connecting rings 14 spaced apart along the width of the tab enables the hinge structure 10 to have multi-dimensional rotation capabilities, dispersing external forces from multiple directions and positions. Furthermore, the simultaneous insertion of multiple connecting rings 14 into the third hinge portion 15 and the fourth hinge portion 16 increases the connection points and contact area between them, making the connection of the hinge structure 10 more stable. Even under frequent external impacts during long-term battery use, the hinge structure 10 is less prone to loosening or damage.

[0074] In some embodiments, refer to Figure 5 The hinge structure 10 includes multiple links 17, which are sequentially hinged in a straight line.

[0075] One of the two adjacent connecting parts 20B is connected to a link 17 at one end of the hinge structure 10, and the other is connected to a link 17 at the other end of the hinge structure 10.

[0076] In this embodiment, as Figure 5 As shown, the hinge structure 10 is composed of multiple links 17. Specifically, the hinge structure 10 includes multiple links 17, which are connected sequentially in a straight line to form a flexible hinge structure similar to a chain. In terms of connection, one of two adjacent connecting parts 20B is connected to a link 17 at one end of the hinge structure 10, and the other is connected to a link 17 at the other end of the hinge structure 10. Through this link 17 structure, the hinge structure 10 has good flexibility and multi-directional rotation capability, which can closely fit the stress changes in the tab bending area 10Q. When the battery is subjected to external force, the stress on the tab can be dispersed and buffered from multiple angles and directions through the relative rotation between the links 17, further optimizing the mechanical performance of the tab in the bending area 10Q, and significantly improving the stability of the battery in reliability testing and actual use.

[0077] When the battery undergoes reliability tests such as roller tests and drop tests, the external force generated by the shaking of the cell 120 is transmitted to the electrode tab, and the hinge structure 10 of link 17 then comes into play. Taking the roller test as an example, during the rolling process inside the roller, the battery will be subjected to impact forces of varying magnitudes from different directions. These forces are transmitted through the cell 120 to the electrode tab, and then act on the connection part 20B connected to the hinge structure 10 of link 17. Since multiple links 17 are connected in a straight sequence, when the electrode tab is subjected to a tensile force in a certain direction, the link 17 located at the front end in the direction of the force will be subjected to the force first and will rotate slightly.

[0078] This rotation is sequentially transmitted to subsequent links 17, causing the entire hinge structure 10 to deform in a chain-like manner. The relative rotation between each link 17 decomposes the tensile force in one direction into components in multiple directions, such as decomposing the oblique tensile force into tensile force along the length of link 17 and shear force perpendicular to the length of link 17. Through the coordinated rotation and force decomposition between links 17, the stress on the tab bending area 10Q can be evenly distributed throughout the hinge structure 10 and the tab, avoiding stress concentration at the bending point. Even if the direction of external force changes frequently, the link 17-type hinge structure 10 can respond quickly, continuously and effectively dispersing stress through flexible rotation adjustment between links 17, reducing the risk of tab breakage at the bending position, ensuring the normal connection of the internal circuit of the cell 120, and maintaining stable battery performance.

[0079] In some embodiments, refer to Figure 6 and Figure 7 The rotating structure consists of two bent layers 20 spaced apart along the thickness direction of the tab. In this embodiment, the rotating structure is redesigned, consisting of two bent layers 20 spaced apart along the thickness direction of the tab. Specifically, at the bending region 10Q of the tab, the tab material is divided into two parallel and spaced layers along the thickness direction, both of which are bent to form a structure of two bent layers 20 with a certain spacing. The thickness of the two bent layers 20 can be greater than the thickness of other parts of the tab.

[0080] When the battery undergoes reliability tests such as roller tests and drop tests, the external force generated by the shaking of the cell 120 is transmitted to the tab, and the rotating structure of the two bending layers 20 begins to function. Taking the drop test as an example, at the moment of impact, the cell 120 shakes violently due to inertia, exerting a large pulling force on the tab. At this time, the force is transmitted to the two bending layers 20. Since the two bending layers 20 are spaced apart along the thickness direction of the tab, relative misalignment occurs between the two layers when subjected to external force. This relative misalignment acts like a precise stress dispersion device. When the tab is subjected to an oblique pulling force, the upper bending layer 20 and the lower bending layer 20 will generate slight misalignment in different directions, decomposing the oblique pulling force into a component force along the thickness direction of the tab and a component force perpendicular to the thickness direction. This allows the stress originally concentrated at the bending point to be evenly distributed to the two bending layers 20 and the entire tab structure. As the direction and magnitude of the external force continue to change, the two bending layers 20 will adjust their relative positions in real time to continuously disperse and buffer the stress on the tabs.

[0081] More importantly, even in extreme cases where one of the two bending layers 20 breaks due to excessive external force, the other layer can still maintain its integrity due to its own structure and connection relationship, continuing to bear the functions of current conduction and stress dispersion. This is like setting up double insurance, greatly reducing the risk of the tab breaking completely at the bending position, ensuring that the internal circuit of the cell 120 always remains connected, and guaranteeing the stable performance of the battery under harsh testing environments.

[0082] In some embodiments, refer to Figure 2 The number of bending regions 10Q is set to two, and the two bending regions 10Q are spaced apart along the thickness direction of the battery and have different bending directions.

[0083] In this embodiment, the number of bending regions 10Q is set to two. The two bending regions 10Q are distributed at intervals along the thickness direction of the battery and the bending directions are different from each other. Specifically, the first tab 130 or the second tab 140 is welded to one side of the cell 120 in the thickness direction. Starting from the welding point, the tab passes through the two bending regions 10Q with different bending directions in sequence. First, it bends from the side of the cell 120 to the middle position of the cell 120, and then the direction is further adjusted through the second bending region 10Q, extending towards the housing 110, and finally passing out from the middle position of the housing 110.

[0084] In some embodiments, refer to Figure 1 The distance between the end of the battery cell 120 with the first tab 130 and the second tab 140 welded on it and the top inner wall of the housing 110 is L, which satisfies: 0.5mm≤L≤1.5mm.

[0085] In this embodiment, as Figure 1As shown, the distance L between the end of the cell 120 with the first tab 130 and the second tab 140 welded to it and the top inner wall of the casing 110 can be set within the range of 0.5mm to 1.5mm. For example, the distance L can be set to 0.5mm, 1mm, or 1.5mm. The setting of this distance parameter is determined by comprehensively considering factors such as the internal space layout of the battery, the mechanical properties of the cell 120 and the tabs, and the overall reliability of the battery. By controlling the distance within a reasonable range, it is possible to ensure that the cell 120 has the necessary space within the casing 110 to accommodate the bending area 10Q and the corresponding rotation structure, while effectively limiting excessive shaking of the cell 120. At the same time, it is ensured that the tabs are in the optimal stress dispersion state when subjected to force, thereby optimizing and improving battery performance.

[0086] In some embodiments, the battery cell 120 is a wound battery cell, which includes a positive electrode sheet, a separator, and a negative electrode sheet that are stacked and wound around each other. A first tab 130 is welded to one of the positive and negative electrode sheets, and a second tab 140 is welded to the other of the positive and negative electrode sheets; or...

[0087] The cell 120 is a laminated cell, which includes a positive electrode, a separator and a negative electrode arranged alternately in sequence. The first tab 130 is welded to one of the positive electrode and the negative electrode, and the second tab 140 is welded to the other of the positive electrode and the negative electrode.

[0088] In this embodiment, the battery cell 120 encompasses two mainstream cell types: wound cells and stacked cells. Regardless of the cell type 120 used, the same tab connection method, bending zone 10Q, and rotation structure design can achieve the effects of tab stress dispersion and stable electrical connection. This greatly improves the versatility and flexibility of battery design. Enterprises can freely choose the appropriate cell type 120 according to different production needs and product positioning without having to redesign the key connection structure of the battery, thus reducing R&D costs and production difficulty.

[0089] The above description is only a part or preferred embodiment of this utility model. Neither the text nor the drawings should limit the scope of protection of this utility model. All equivalent structural transformations made using the content of this utility model specification and drawings under the overall concept of this utility model, or direct / indirect applications in other related technical fields, are included within the scope of protection of this utility model.

Claims

1. A battery, characterized in that, include: The housing (110) is provided with a receiving cavity (101); The battery cell (120) is disposed within the accommodating cavity (101); The first electrode (130) is welded to the battery cell (120) at one end and extends out of the housing (110) at the other end; The second tab (140) is welded to the battery cell (120) at one end and extends out of the housing (110) at the other end. The polarity of the second tab (140) is opposite to that of the first tab (130). Wherein, at least one of the first electrode (130) and the second electrode (140) has a bending region (10Q) between its two ends, the bending region (10Q) is located in the receiving cavity (101), and the bending region (10Q) is provided with a rotating structure that can be rotated under force.

2. The battery according to claim 1, characterized in that, The rotating structure is a hinge structure (10); At least one of the first electrode (130) and the second electrode (140) has a connecting portion (20B) between its two ends. The connecting portions (20B) are respectively provided at opposite ends of the bending area (10Q), and adjacent connecting portions (20B) are connected by the hinge structure (10).

3. The battery according to claim 2, characterized in that, The hinge structure (10) includes a connecting shaft (11), a first hinge part (12) and a second hinge part (13). The first hinge part (12) and the second hinge part (13) are both sleeved on the connecting shaft (11) and can rotate around the connecting shaft (11). One of the two adjacent connecting parts (20B) is connected to the first hinge part (12), and the other is connected to the second hinge part (13).

4. The battery according to claim 3, characterized in that, The first hinge portion (12) has a plurality of spaced first bushing portions (121) on one side, and the second hinge portion (13) has a plurality of spaced second bushing portions (131) on one side. Multiple first bushing portions (121) and multiple second bushing portions (131) are alternately sleeved on the connecting shaft (11) along the axial direction of the connecting shaft (11).

5. The battery according to claim 2, characterized in that, The hinge structure (10) includes multiple connecting rings (14), a third hinge portion (15) and a fourth hinge portion (16). The multiple connecting rings (14) are arranged at intervals along the width direction of the tab and pass through the third hinge portion (15) and the fourth hinge portion (16). One of the two adjacent connecting parts (20B) is connected to the third hinge part (15), and the other is connected to the fourth hinge part (16).

6. The battery according to claim 2, characterized in that, The hinge structure (10) includes multiple links (17), which are sequentially hinged in a straight line. One of the two adjacent connecting parts (20B) is connected to the link (17) at one end of the hinge structure (10), and the other is connected to the link (17) at the other end of the hinge structure (10).

7. The battery according to claim 1, characterized in that, The rotating structure consists of two bent layers (20) spaced apart along the thickness direction of the tab.

8. The battery according to claim 1, characterized in that, The number of bending regions (10Q) is set to two, and the two bending regions (10Q) are spaced apart along the thickness direction of the battery and have different bending directions.

9. The battery according to any one of claims 1 to 8, characterized in that, The distance between the end of the battery cell (120) with the first tab (130) and the second tab (140) welded thereon and the top inner wall of the housing (110) is L, which satisfies: 0.5mm≤L≤1.5mm.

10. The battery according to any one of claims 1 to 8, characterized in that, The battery cell (120) is a wound battery cell, which includes a positive electrode sheet, a separator, and a negative electrode sheet that are stacked and wound together. The first tab (130) is welded to one of the positive electrode sheet and the negative electrode sheet, and the second tab (140) is welded to the other of the positive electrode sheet and the negative electrode sheet; or... The battery cell (120) is a laminated battery cell, which includes a positive electrode, a separator and a negative electrode arranged alternately in sequence. The first tab (130) is welded to one of the positive electrode and the negative electrode, and the second tab (140) is welded to the other of the positive electrode and the negative electrode.

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