Battery cell and battery

Abstract

The utility model relates to the technical field of electric core, especially a kind of electric core and battery.The electric core includes first adhesive piece, the first adhesive piece is set in the tab end, the first adhesive piece includes first connecting part, second connecting part and third connecting part, one end of the second connecting part is connected to the first connecting part, the other end of the second connecting part is connected to the third connecting part, the second connecting part is by the first side wall around to the second side wall, to make the first connecting part be adhered to the end of the first side wall in the tab end, and make the third connecting part be adhered to the end of the second side wall in the tab end.The battery includes the above-mentioned electric core.The electric core and battery have good use safety.

Description

Technical Field

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

[0002] Soft-pack lithium-ion batteries are widely used. To ensure the pass rate of safety performance tests such as cell drop tests, single-sided adhesive tape is typically used to secure the bare cells. However, in existing cell structures, one layer of adhesive tape is usually applied to the tab end, and two layers to the non-tab end, with the tape in rectangular shape. Using this adhesive tape structure to secure the cell, in extreme cases after the cell is subjected to external impact, the un-adhesive portion of the outer electrode is prone to folding and breakage, leading to a series of failures such as zero voltage and gas expansion. Utility Model Content

[0003] The main purpose of this utility model is to propose a battery cell and battery that aims to solve the technical problem that the existing rubber wrapping structure cannot effectively wrap the battery cell, and the outer electrode of the battery cell is prone to folding or breaking after the battery cell is subjected to external impact.

[0004] To achieve the above objectives, this utility model proposes a battery cell, the battery cell including a tab end and a non-tab end disposed opposite each other along a first direction, the battery cell including a first sidewall and a second sidewall disposed opposite each other along a second direction perpendicular to the first direction, the battery cell comprising:

[0005] A first adhesive component is disposed at the tab end. The first adhesive component includes a first connecting portion, a second connecting portion, and a third connecting portion. One end of the second connecting portion is connected to the first connecting portion, and the other end of the second connecting portion is connected to the third connecting portion. The second connecting portion is wound around the first sidewall to the second sidewall, so that the first connecting portion is bonded to the end of the first sidewall at the tab end, and the third connecting portion is bonded to the end of the second sidewall at the tab end. The second connecting portion is bonded between the positive tab and the negative tab.

[0006] The second adhesive component is disposed at the non-tab end. The second adhesive component includes a fourth connecting portion, a fifth connecting portion, and a sixth connecting portion. One end of the fifth connecting portion is connected to the fourth connecting portion, and the other end of the fifth connecting portion is connected to the sixth connecting portion. The fifth connecting portion is wound around the first sidewall to the second sidewall, so that the fourth connecting portion is bonded to the first sidewall at the end of the non-tab end, and the sixth connecting portion is bonded to the second sidewall at the end of the non-tab end.

[0007] In some embodiments, the direction perpendicular to the first direction and perpendicular to the second direction is defined as a third direction. Along the third direction, the first connecting portion extends in a straight line from one end of the first sidewall to the other end of the first sidewall, and the third connecting portion extends in a straight line from one end of the second sidewall to the other end of the second sidewall.

[0008] In some embodiments, the direction perpendicular to the first direction and perpendicular to the second direction is defined as a third direction. Along the third direction, the fourth connecting portion extends in a straight line from one end of the first sidewall to the other end of the first sidewall, and the sixth connecting portion extends in a straight line from one end of the second sidewall to the other end of the second sidewall.

[0009] In some embodiments, the direction perpendicular to the first direction and perpendicular to the second direction is defined as a third direction. Along the third direction, the distance L1 between the second connecting part and the positive electrode tab satisfies: 0mm≤L1≤5mm, and the distance L2 between the second connecting part and the negative electrode tab satisfies: 0mm≤L2≤5mm.

[0010] In some embodiments, the second connecting portion is provided with a through hole, which extends from one end of the second connecting portion to the other end of the second connecting portion along the direction from the first connecting portion to the third connecting portion;

[0011] And / or, the fifth connecting portion is provided with a through hole, which extends from one end of the fifth connecting portion to the other end of the fifth connecting portion along the direction from the fourth connecting portion to the sixth connecting portion.

[0012] In some embodiments, the direction perpendicular to the first direction and the direction perpendicular to the second direction is defined as a third direction; the through hole is a rectangular hole, and along the third direction, the length L3 of the through hole satisfies: 0.5mm≤L3≤20mm;

[0013] Alternatively, the through hole is a circular hole, and the diameter D of the through hole satisfies: 0.5mm≤D≤20mm.

[0014] In some embodiments, the battery cell includes a third adhesive member, one end of which is connected to the end of the third connection portion away from the first connection portion, and the other end of which is connected to the end of the sixth connection portion away from the fourth connection portion.

[0015] The third adhesive is bonded to the second sidewall.

[0016] In some embodiments, the first sidewall is provided with a hot melt adhesive layer;

[0017] Wherein, along the first direction, the distance L4 between the first connecting part and the hot melt adhesive layer satisfies: 0mm≤L4≤5mm, and the distance L5 between the fourth connecting part and the hot melt adhesive layer satisfies: 0mm≤L5≤5mm.

[0018] In some embodiments, the battery cell includes side adhesive paper that extends from one end of the battery cell to the other end of the battery cell along the first direction;

[0019] The first connecting portion, the third connecting portion, and the side adhesive paper are at least partially overlapped.

[0020] And / or, the fourth connecting portion, the sixth connecting portion, and the side adhesive paper are at least partially overlapped.

[0021] In some embodiments, both the first adhesive and the second adhesive include a substrate and an adhesive layer, wherein the adhesive layer is bonded to the substrate.

[0022] Correspondingly, this utility model also proposes a battery, which includes the battery cell described in any of the above embodiments.

[0023] Compared with the prior art, the beneficial effects of this utility model are:

[0024] In the technical solution of this utility model, the first adhesive member is bonded to the tab end of the battery cell in a U-shaped winding manner, such that the first connecting part wraps around the end of the first sidewall near the tab end, and the third connecting part wraps around the end of the second sidewall near the tab end. Similarly, the second adhesive member is bonded to the non-tab end of the battery cell in a U-shaped winding manner, such that the fourth connecting part wraps around the end of the first sidewall near the non-tab end, and the sixth connecting part wraps around the end of the second sidewall near the non-tab end. This structure not only facilitates the bonding of multiple layers of electrodes and separators within the battery cell, preventing the risk of short circuits after displacement of the electrodes and separators inside the battery cell, but also improves the structural strength of the outer electrode rings of the battery cell, preventing them from bending, breaking, or other defects after being subjected to impact.

[0025] When a battery cell is subjected to external impact (such as drops or compression), traditional end-wrap adhesive may fail due to insufficient bonding area or a single constraint direction, causing the outer electrode sheets (especially the outermost electrode sheets) at the cell's end to fold or even break. In this application, the first and third connecting portions are directly adhered to and cover the two edges of the tab end of the electrode stack, providing effective cushioning protection directly to the two edges of the tab end. Similarly, the fourth and sixth connecting portions are directly adhered to and cover the two edges of the non-tab end of the electrode stack, providing effective cushioning protection directly to the two edges of the non-tab end. Simultaneously, the second and fifth connecting portions further constrain the displacement of the electrode stack in various directions. This multi-point, multi-directional combined constraint structure significantly suppresses the relative displacement and stress concentration of the outer electrode sheets under impact, effectively preventing folding and breakage of the outer electrode sheets.

[0026] Batteries using the aforementioned cells have high impact resistance and safety in use. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0028] Figure 1 A schematic diagram of the overall structure of a battery cell provided in an embodiment of the present invention from a first-view perspective;

[0029] Figure 2 A schematic diagram of the overall structure of a battery cell provided in an embodiment of the present invention from a second perspective;

[0030] Figure 3 This is a schematic diagram of the structure of the first adhesive component in a battery cell provided in an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the structure of the second adhesive component in a battery cell according to an embodiment of the present invention;

[0032] Figure 5 A schematic diagram of the overall structure of a battery cell provided in another embodiment of the present invention from a first-view perspective;

[0033] Figure 6 A schematic diagram of the overall structure of a battery cell provided in another embodiment of the present invention from a second perspective;

[0034] Figure 7 A schematic diagram of the connection structure of the first adhesive component, the second adhesive component, and the third adhesive component in a battery cell provided in another embodiment of this utility model.

[0035] Explanation of icon numbers:

[0036] 10. Battery cells;

[0037] 11. Polar end; 12. Non-polar end; 13. First lateral wall; 14. Second lateral wall;

[0038] 100. First adhesive component;

[0039] 110. First connecting part; 120. Second connecting part; 130. Third connecting part;

[0040] 200. Second adhesive component;

[0041] 210. Fourth connecting part; 220. Fifth connecting part; 230. Sixth connecting part;

[0042] 221. Through hole;

[0043] 300. Third adhesive component;

[0044] 400. Hot melt adhesive layer;

[0045] 500, side adhesive paper;

[0046] X, first direction;

[0047] Y, second direction;

[0048] Z, Third-party orientation.

[0049] 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

[0050] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0051] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0052] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are 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 with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or," "and / or," or "and / or" throughout the text implies three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where A and B are simultaneously satisfied. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0053] Soft-pack lithium-ion batteries are widely used. To ensure the pass rate of safety performance tests such as cell drop tests, single-sided adhesive tape is typically used to secure the bare cells. However, in existing cell structures, one layer of adhesive tape is usually applied to the tab end, and two layers to the non-tab end, with the tape in rectangular shape. Using this adhesive tape structure to secure the cell, in extreme cases after the cell is subjected to external impact, the un-adhesive portion of the outer electrode is prone to folding and breakage, leading to a series of failures such as zero voltage and gas expansion.

[0054] Based on this, in order to solve the technical problem that the existing rubber-wrapped structure cannot effectively wrap the battery cell 10, and that the outer electrode of the battery cell 10 is prone to folding or breakage after being subjected to external impact, refer to Figures 1 to 4This utility model provides a battery cell 10, which includes a tab end 11 and a non-tab end 12 disposed opposite each other along a first direction X. The battery cell 10 also includes a first sidewall 13 and a second sidewall 14 disposed opposite each other along a second direction Y perpendicular to the first direction X. The battery cell 10 includes a first adhesive member 100 and a second adhesive member 200. The first adhesive member 100 is disposed on the tab end 11 and includes a first connecting portion 110, a second connecting portion 120, and a third connecting portion 130. For example, the first connecting portion 110, the second connecting portion 120, and the third connecting portion 130 can be an integrally formed structure. One end of the second connecting portion 120 is connected to the first connecting portion 110, and the other end of the second connecting portion 120 is connected to the third connecting portion 130. The second connecting portion 120 is wound around the first sidewall 13 to the second sidewall 14, so that the first connecting portion 110 is bonded to the end of the first sidewall 13 at the tab end 11, and the third connecting portion 130 is bonded to the end of the second sidewall 14 at the tab end 11. The second connecting portion 120 is bonded between the positive tab and the negative tab. The second adhesive member 200 is disposed at the non-tab end 12. The second adhesive member 200 includes a fourth connecting portion 210, a fifth connecting portion 220, and a sixth connecting portion 230. For example, the fourth connecting portion 210, the fifth connecting portion 220, and the sixth connecting portion 230 can be an integrally formed structure. One end of the fifth connecting part 220 is connected to the fourth connecting part 210, and the other end of the fifth connecting part 220 is connected to the sixth connecting part 230. The fifth connecting part 220 is wound around the first side wall 13 to the second side wall 14, so that the fourth connecting part 210 is bonded to the end of the non-latch end 12 of the first side wall 13, and the sixth connecting part 230 is bonded to the end of the non-latch end 12 of the second side wall 14.

[0055] Specifically, in this embodiment, the first adhesive member 100 is bonded to the tab end 11 of the battery cell 10 in a U-shaped winding manner, such that the first connecting portion 110 wraps around the end of the first sidewall 13 near the tab end 11, and the third connecting portion 130 wraps around the end of the second sidewall 14 near the tab end 11. Similarly, the second adhesive member 200 is bonded to the non-tab end 12 of the battery cell 10 in a U-shaped winding manner, such that the fourth connecting portion 210 wraps around the end of the first sidewall 13 near the non-tab end 12, and the sixth connecting portion 230 wraps around the end of the second sidewall 14 near the non-tab end 12. This structure not only facilitates bonding the multilayer electrodes and separator in the battery cell 10, preventing the risk of short circuits after displacement of the electrodes and separator inside the battery cell 10, but also improves the structural strength of the outer electrode ring of the battery cell 10, preventing the outer electrode ring of the battery cell 10 from bending, breaking, or other adverse conditions after being subjected to impact.

[0056] When the battery cell 10 is subjected to external impact (such as drop or compression), traditional end-wrap adhesive may fail due to insufficient bonding area or unidirectional constraint, causing the outer electrode sheets (especially the outermost electrode sheets) at the end of the battery cell 10 to fold or even break. In this application, the first connecting portion 110 and the third connecting portion 130 are directly adhered to and cover the two sides of the tab end 11 of the electrode stack, providing effective cushioning protection for the two sides of the tab end 11. Similarly, the fourth connecting portion 210 and the sixth connecting portion 230 are directly adhered to and cover the two sides of the non-tab end 12 of the electrode stack, providing effective cushioning protection for the two sides of the non-tab end 12. Furthermore, the second connecting portion 120 and the fifth connecting portion 220 further constrain the displacement of the electrode stack in various directions. The aforementioned multi-point, multi-directional joint constraint structure greatly suppresses the relative displacement and stress concentration of the outer electrode under impact, thereby effectively preventing the outer electrode from flipping and breaking.

[0057] Both the first adhesive component 100 and the second adhesive component 200 are designed as an integrally formed structure with three connecting parts (first connecting part 110 to third connecting part 130, fourth connecting part 210 to sixth connecting part 230). This integral design avoids gaps or weak points that may exist in segmented bonding, ensuring the continuity and uniform distribution of adhesive force. At the same time, the second connecting part 120 and the fifth connecting part 220 are wrapped from the first sidewall 13 to the second sidewall 14, realizing complete wrapping of the end sidewall of the battery cell 10, making the wrapping effect more comprehensive and reliable.

[0058] In some embodiments, refer to Figure 1 and Figure 2 The direction perpendicular to the first direction X and the second direction Y is defined as the third direction Z. Along the third direction Z, the first connecting part 110 extends from one end of the first sidewall 13 in a straight line to the other end of the first sidewall 13, and the third connecting part 130 extends from one end of the second sidewall 14 in a straight line to the other end of the second sidewall 14.

[0059] Specifically, in this embodiment, the above structure achieves, firstly, full-width coverage and reinforcement of the sidewall ends. The first connecting portion 110 extends linearly along the third direction Z and covers the entire width of the first sidewall 13 at the tab end 11. Similarly, the third connecting portion 130 extends linearly and covers the entire width of the second sidewall 14 at the tab end 11. This completely eliminates the potential for unbonded areas at the sidewall ends in the width direction, ensuring complete, continuous, and seamless bonding coverage of the two sidewall edges of the tab end 11 of the battery cell 10. Secondly, it provides all-around buffer protection. When the battery cell 10 is subjected to external impact, the first connecting portion 110 and the third connecting portion 130 can provide effective buffer protection for the ends of the battery cell 10 at various locations, preventing the ends of the battery cell 10 from being bent or damaged after being subjected to impact, thus ensuring the safety of the battery cell 10 during testing and use. Thirdly, it simplifies the manufacturing process and ensures consistency. The first connecting part 110 and the third connecting part 130 adopt a linear continuous structure, which makes it easier to achieve precise control and automated operation in manufacturing. This helps to ensure the accuracy of the bonding position and the uniformity of the bonding quality, avoids the misalignment or gap problems that may occur in segmented bonding, and improves production efficiency and product yield.

[0060] In some embodiments, refer to Figure 1 and Figure 2 The direction perpendicular to the first direction X and the second direction Y is defined as the third direction Z. Along the third direction Z, the fourth connecting part 210 extends from one end of the first sidewall 13 in a straight line to the other end of the first sidewall 13, and the sixth connecting part 230 extends from one end of the second sidewall 14 in a straight line to the other end of the second sidewall 14.

[0061] Specifically, referring to the above embodiments, the above structure can achieve continuous bonding coverage and reinforcement of the sidewall edges, which not only increases the bonding area and bonding force, but also effectively and uniformly disperses impact stress, providing more comprehensive buffer protection and greatly improving the structural stability and impact resistance reliability of the battery cell 10.

[0062] In some embodiments, refer to Figure 1 The direction perpendicular to the first direction X and perpendicular to the second direction Y is defined as the third direction Z. Along the third direction Z, the distance L1 between the second connecting part 120 and the positive electrode tab satisfies: 0mm ≤ L1 ≤ 5mm, and the distance L2 between the second connecting part 120 and the negative electrode tab satisfies: 0mm ≤ L2 ≤ 5mm. For example, the value of L1 can be 0mm, 0.5mm, 1mm, 1.5mm, 2mm, 3mm, 5mm, etc. The value of L2 can be 0mm, 0.5mm, 1mm, 1.5mm, 2mm, 3mm, 5mm, etc.

[0063] Specifically, in this embodiment, the distance between the second connecting part 120 and the positive and negative tabs is set within the above-mentioned range to avoid the distance between the second connecting part 120 and the positive and negative tabs being too large (for example, the value of L1 or L2 is 7mm, 8mm, 9mm, etc.), which would result in the second connecting part 120 being structurally weak and affecting the structural strength of the first adhesive 100.

[0064] In some embodiments, refer to Figure 1 , Figure 2 as well as Figure 4 The fifth connecting portion 220 has a through hole 221 extending from one end of the fifth connecting portion 220 to the other end in the direction from the fourth connecting portion 210 to the sixth connecting portion 230. For example, the through hole 221 can extend from one end of the fifth connecting portion 220 along a straight path to the other end. Alternatively, the through hole 221 can extend from one end of the fifth connecting portion 220 along a curved path to the other end. Or, the through hole 221 can extend from one end of the fifth connecting portion 220 along an irregular path to the other end.

[0065] Specifically, in this embodiment, by providing a through hole 221 in the fifth connecting part 220, when the fifth connecting part 220 is wrapped around and pasted to the second side wall 14 from the first side wall 13, a pore can be formed at the through hole 221. The pore facilitates the wetting of the electrode by the electrolyte, thereby improving the diffusion efficiency of ions (for example, the ions can be lithium ions) between the positive and negative electrodes and ensuring the safety of the battery cell 10 in use.

[0066] Based on the same principle and effect as above, the second connecting part 120 may also have a through hole 221, which extends from one end of the second connecting part 120 to the other end of the second connecting part 120 in the direction from the first connecting part 110 to the third connecting part 130.

[0067] In some embodiments, refer to Figure 1 The direction perpendicular to the first direction X and perpendicular to the second direction Y is defined as the third direction Z. The through hole 221 is a rectangular hole, and along the third direction Z, the length L3 of the through hole 221 satisfies: 0.5mm ≤ L3 ≤ 20mm. For example, the value of L3 can be 0.5mm, 5mm, 10mm, 15mm, 20mm, etc. Alternatively, the through hole 221 can be a circular hole, and the diameter D of the through hole 221 satisfies: 0.5mm ≤ D ≤ 20mm. For example, the value of D can be 0.5mm, 5mm, 10mm, 15mm, 20mm, etc.

[0068] Specifically, in this embodiment, the size of the through hole 221 is set within the aforementioned range. On the one hand, this prevents the opening size of the through hole 221 from being too small (e.g., the opening size of the through hole 221 is 0.1mm, 0.2mm, 0.3mm, etc.), which would prevent the electrolyte from effectively wetting the electrode sheets, thus failing to ensure that ions can fully diffuse between the positive and negative electrode sheets through the electrolyte, affecting the performance and safety of the battery cell 10. On the other hand, this prevents the opening size of the through hole 221 from being too large (e.g., the opening size of the through hole 221 is 30mm, 40mm, 50mm, etc.), which would prevent the second adhesive 200 from effectively providing buffer protection for the non-tab end 12 of the battery cell 10, thus failing to ensure the impact resistance performance of the non-tab end 12 of the battery cell 10, affecting the safety performance test pass rate and safety of the battery cell 10.

[0069] In some embodiments, refer to Figures 5 to 7 The battery cell 10 includes a third adhesive member 300. One end of the third adhesive member 300 is connected to the end of the third connecting portion 130 away from the first connecting portion 110, and the other end of the third adhesive member 300 is connected to the end of the sixth connecting portion 230 away from the fourth connecting portion 210. The third adhesive member 300 is bonded to the second sidewall 14. For example, the first adhesive member 100, the second adhesive member 200, and the third adhesive member 300 can be an integrally molded structure.

[0070] Specifically, in this embodiment, by providing a third adhesive member 300, and connecting the third adhesive member 300, the first adhesive member 100, and the second adhesive member 200 together, this structure improves the overall structural protection of the battery cell 10 by the first adhesive member 100, the second adhesive member 200, and the third adhesive member 300. This ensures that the first adhesive member 100, the second adhesive member 200, and the third adhesive member 300 provide comprehensive buffer protection for the battery cell 10, preventing weak areas in the battery cell 10 due to improper adhesive bonding, and preventing damage to the battery cell 10 during manufacturing processes. During safety performance testing or after impact, the electrode sheet may be bent or broken. On the other hand, it facilitates the integrated and mass production of the first adhesive component 100, the second adhesive component 200, and the third adhesive component 300, which helps to reduce the manufacturing difficulty of the first adhesive component 100, the second adhesive component 200, and the third adhesive component 300, reduce the bonding gap of the first adhesive component 100, the second adhesive component 200, and the third adhesive component 300 during actual bonding, and ensure the reliability of the connection structure of the first adhesive component 100, the second adhesive component 200, and the third adhesive component 300.

[0071] In some embodiments, refer to Figure 1 and Figure 5A hot melt adhesive layer 400 is provided on the first sidewall 13. The hot melt adhesive layer 400 enables stable bonding between the battery cell 10 and the packaging film (e.g., the packaging film is typically an aluminum-plastic film, steel shell, aluminum shell, etc.), preventing the battery cell 10 from shifting within the packaging film and affecting its safety. Specifically, along the first direction X, the distance L4 between the first connecting portion 110 and the hot melt adhesive layer 400 satisfies: 0mm ≤ L4 ≤ 5mm, and the distance L5 between the fourth connecting portion 210 and the hot melt adhesive layer 400 satisfies: 0mm ≤ L5 ≤ 5mm. For example, the value of L4 can be 0mm, 0.5mm, 1mm, 2mm, 3mm, 4mm, 5mm, etc. The value of L5 can be 0mm, 0.5mm, 1mm, 2mm, 3mm, 4mm, 5mm, etc.

[0072] Specifically, in this embodiment, the distance between the first connecting portion 110 and the hot melt adhesive layer 400, and the distance between the fourth connecting portion 210 and the hot melt adhesive layer 400, are set within the aforementioned range. This prevents negative distances (e.g., L4 or L5 values ​​of -0.1mm, -0.2mm, -0.3mm, etc.) from occurring between the first connecting portion 110 and the hot melt adhesive layer 400, or between the fourth connecting portion 210 and the hot melt adhesive layer 400, thus avoiding potential problems. The overlap between the fourth connecting part 210 and the hot melt adhesive layer 400 leads to an increase in the thickness of the battery cell 10, resulting in a decrease in the energy density of the battery cell 10. On the other hand, to prevent the distance between the first connecting part 110 and the hot melt adhesive layer 400, or the distance between the fourth connecting part 210 and the hot melt adhesive layer 400 from being too large (for example, the value of L4 or L5 is 7mm, 8mm, 9mm, etc.), which would reduce the effective bonding area of ​​the hot melt adhesive layer 400 and prevent the battery cell 10 from being stably and reliably bonded to the packaging film.

[0073] In some embodiments, the battery cell 10 includes a side adhesive strip 500 extending from one end of the battery cell 10 to the other end along a first direction X. The first connecting portion 110, the third connecting portion 130, and the side adhesive strip 500 are at least partially overlapping. And / or, the fourth connecting portion 210, the sixth connecting portion 230, and the side adhesive strip 500 are at least partially overlapping. Exemplarily, for example, the overlap length between the first connecting portion 110, the third connecting portion 130, and the side adhesive strip 500 can be between 0.5 mm and 3 mm (inclusive of the end value). The overlap length between the fourth connecting portion 210, the sixth connecting portion 230, and the side adhesive strip 500 can also be between 0.5 mm and 3 mm (inclusive of the end value).

[0074] Specifically, in this embodiment, the side adhesive paper 500 can wrap the ends of the first connecting part 110, the third connecting part 130, the fourth connecting part 210, or the sixth connecting part 230 to prevent gaps between the side adhesive paper 500 and the first connecting part 110, the third connecting part 130, the fourth connecting part 210, or the sixth connecting part 230, which would result in insufficient bonding strength of the first connecting part 110, the third connecting part 130, the fourth connecting part 210, or the sixth connecting part 230, and avoid the edges of the first connecting part 110, the third connecting part 130, the fourth connecting part 210, or the sixth connecting part 230 from turning up or breaking.

[0075] In some embodiments, the first adhesive 100, the second adhesive 200, and the third adhesive 300 each include a substrate and an adhesive layer, with the adhesive layer bonded to the substrate. The substrate serves as a carrier for the adhesive layer, and the adhesive layer has pressure or pressure-temperature sensitive properties and is in contact with the electrode.

[0076] Specifically, in this embodiment, the substrate enhances the structural strength of the first adhesive 100, the second adhesive 200, and the third adhesive 300, ensuring good cushioning performance. The adhesive layer improves the bonding performance of the first adhesive 100, the second adhesive 200, and the third adhesive 300, ensuring the bonding stability and reliability between the first adhesive 100, the second adhesive 200, and the third adhesive 300 and the battery cell 10.

[0077] Referring to Table 1, a comparative experiment was conducted on the battery cell 10 with the conventional adhesive-wound structure and the battery cell 10 with the adhesive-wound structure provided in this embodiment. The experimental results are as follows:

[0078]

[0079] Table 1

[0080] The mechanical performance testing of the battery cells includes tests such as micro-drop, roller, directional drop, and free drop. The method for confirming the folding and damage of the outer electrode sheets is to first disassemble the finished product, remove the bare battery cell 10, and then manually observe and determine its condition using a two-dimensional measuring instrument or microscope.

[0081] According to the comparative experimental results, the battery cell 10 with the adhesive-wound structure provided in this embodiment has good impact resistance, ensuring the safety of the battery cell 10 during safety performance testing and use. The adhesive-wound structure provided in this embodiment (specifically referring to the first adhesive component, the second adhesive component, and the third adhesive component) can enhance the strength of the outer electrode sheet of the bare battery cell 10, reduce the folding and damage of the outer foil of the shallow pit surface of the bare battery cell 10 after safety performance tests such as battery cell roller drop, and prevent failure anomalies such as zero voltage and gas expansion, thereby achieving the purpose of improving the safety performance of the battery cell 10.

[0082] Correspondingly, another embodiment of the present invention also provides a battery (for example, a lithium-ion battery), which includes the cell 10 in any of the above embodiments. The battery also includes a packaging film, in which the cell 10 is encapsulated by a hot melt adhesive layer 400.

[0083] Specifically, in this embodiment, the battery using the above-mentioned cell 10 has high impact resistance and safety in use.

[0084] Thanks to the improvements to the aforementioned cell 10, the battery in this embodiment has the same technical effects as the aforementioned cell 10, which will not be repeated here.

[0085] It should be noted that other contents of the battery cell 10 and battery disclosed in this utility model can be found in the prior art, and will not be repeated here.

[0086] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A battery cell, the battery cell comprising tab ends and non-tab ends disposed opposite each other along a first direction, the battery cell comprising a first sidewall and a second sidewall disposed opposite each other along a second direction perpendicular to the first direction, characterized in that, The device includes a first adhesive component disposed at the tab end. The first adhesive component includes a first connecting portion, a second connecting portion, and a third connecting portion. One end of the second connecting portion is connected to the first connecting portion, and the other end of the second connecting portion is connected to the third connecting portion. The second connecting portion is wound around the first sidewall to the second sidewall, so that the first connecting portion is bonded to the first sidewall at the end of the tab end, and the third connecting portion is bonded to the second sidewall at the end of the tab end.

2. The battery cell according to claim 1, characterized in that, The direction perpendicular to the first direction and perpendicular to the second direction is defined as the third direction. Along the third direction, the first connecting portion extends in a straight line from one end of the first sidewall to the other end of the first sidewall, and the third connecting portion extends in a straight line from one end of the second sidewall to the other end of the second sidewall.

3. The battery cell according to claim 1, characterized in that, The second connecting part is bonded between the positive electrode tab and the negative electrode tab, perpendicular to the first direction, and the direction perpendicular to the second direction is defined as the third direction. Along the third direction, the distance L1 between the second connecting part and the positive electrode tab satisfies: 0mm≤L1≤5mm, and the distance L2 between the second connecting part and the negative electrode tab satisfies: 0mm≤L2≤5mm.

4. The battery cell according to claim 1, characterized in that, The battery cell includes a second adhesive member disposed at the non-tab end. The second adhesive member includes a fourth connecting portion, a fifth connecting portion, and a sixth connecting portion. One end of the fifth connecting portion is connected to the fourth connecting portion, and the other end of the fifth connecting portion is connected to the sixth connecting portion. The fifth connecting portion is wound from the first sidewall to the second sidewall, so that the fourth connecting portion is bonded to the end of the first sidewall at the non-tab end, and the sixth connecting portion is bonded to the end of the second sidewall at the non-tab end.

5. The battery cell according to claim 4, characterized in that, The direction perpendicular to the first direction and perpendicular to the second direction is defined as the third direction. Along the third direction, the fourth connecting portion extends in a straight line from one end of the first sidewall to the other end of the first sidewall, and the sixth connecting portion extends in a straight line from one end of the second sidewall to the other end of the second sidewall.

6. The battery cell according to claim 4, characterized in that, The second connecting portion has a through hole, which extends from one end of the second connecting portion to the other end of the second connecting portion along the direction from the first connecting portion to the third connecting portion; And / or, the fifth connecting portion is provided with a through hole, which extends from one end of the fifth connecting portion to the other end of the fifth connecting portion along the direction from the fourth connecting portion to the sixth connecting portion.

7. The battery cell according to claim 6, characterized in that, The direction perpendicular to the first direction and the direction perpendicular to the second direction is defined as the third direction; the through hole is a rectangular hole, and along the third direction, the length L3 of the through hole satisfies: 0.5mm≤L3≤20mm; Alternatively, the through hole is a circular hole, and the diameter D of the through hole satisfies: 0.5mm≤D≤20mm.

8. The battery cell according to claim 4, characterized in that, The battery cell includes a third adhesive member, one end of which is connected to the end of the third connecting portion away from the first connecting portion, and the other end of which is connected to the end of the sixth connecting portion away from the fourth connecting portion. The third adhesive is bonded to the second sidewall.

9. The battery cell according to claim 8, characterized in that, A hot melt adhesive layer is provided on the first sidewall; Wherein, along the first direction, the distance L4 between the first connecting part and the hot melt adhesive layer satisfies: 0mm≤L4≤5mm, and the distance L5 between the fourth connecting part and the hot melt adhesive layer satisfies: 0mm≤L5≤5mm.

10. The battery cell according to claim 4, characterized in that, The battery cell includes a side adhesive paper that extends from one end of the battery cell to the other end along the first direction; The first connecting portion, the third connecting portion, and the side adhesive paper are at least partially overlapped. And / or, the fourth connecting portion, the sixth connecting portion, and the side adhesive paper are at least partially overlapped.

11. The battery cell according to claim 4, characterized in that, Both the first adhesive and the second adhesive include a substrate and an adhesive layer, wherein the adhesive layer is bonded to the substrate.

12. A battery, characterized in that, Includes the battery cell as described in any one of claims 1 to 11.

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