Battery pack

Abstract

The utility model discloses a battery pack, a top sealing edge of the battery pack is bent and attached to a tab surface of a battery cell, and a side sealing edge is bent and attached to a side edge surface of the battery cell, so that the problem that the space utilization rate of the battery pack is influenced due to the fact that the traditional top sealing edge occupies the head space of the battery cell is solved. The bent battery cell is embedded in the mounting cavity, so that the assembly gap between the battery cell and the mounting cavity is reduced, the optimized battery cell can be more compactly embedded in the mounting cavity of the protection frame, the length of the battery cell is shortened, and the space utilization rate is higher. The end part of one of the top sealing edge and the side sealing edge is provided with a folding edge which is bent and attached to the other one, the end part of the other one is provided with a folding angle, the folding edge and the folding angle are connected and stacked to form a convex hull, the inner side edge of each mounting cavity is provided with a positioning groove, and the convex hull is matched with the positioning groove in a concave-convex manner to limit the movement of the battery cell in the mounting cavity; and the battery cell is stably fixed in the mounting cavity, so that the impact resistance of the battery cell is higher. Therefore, the space utilization rate and the impact resistance of the battery cell are relatively high.

Description

Technical Field

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

[0002] Lithium-ion batteries have been widely used in electronic devices such as laptops, tablets, and smartphones in recent years due to their advantages such as high energy density, light weight, and long cycle life. Taking laptops as an example, these electronic devices are developing towards thinner, lighter, and higher-performance designs, with the body thickness constantly being reduced and the internal space becoming increasingly compact, leading to a continuous shrinking of the installation space for lithium-ion batteries. However, in high-energy-consuming scenarios such as business office work, content creation, and mobile gaming, users' requirements for the battery life and capacity of lithium-ion batteries are constantly increasing. Therefore, how to increase battery capacity within limited space is particularly important.

[0003] However, traditional lithium battery designs have many shortcomings in terms of space utilization and structural reliability. For example, due to the inherent characteristics of the packaging structure, common aluminum-cased or cylindrical cells waste space when stacked. While conventional pouch cells have the advantage of flexibility, their top sealing area is usually not fully utilized, resulting in reduced space utilization. Furthermore, existing packaging designs do not adequately constrain the cells, making them prone to casing deformation or internal electrode displacement under external impact, resulting in generally insufficient impact resistance.

[0004] Therefore, how to improve the space utilization and impact resistance of batteries is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this utility model is to provide a battery pack in which the top and side sealing edges of the battery cell are bent. The bent sealing edges at both ends of the top sealing edge are connected to the top bend of the side sealing edge and stacked to form a side convex bulge. The side convex bulge is in convex-concave fit with the positioning groove provided on the inner side of the mounting cavity, which effectively improves the space utilization and impact resistance of the battery cell.

[0006] To achieve the above objectives, this utility model provides a battery pack, comprising:

[0007] The battery cell includes at least one; the outer surface of each battery cell includes a tab surface and a side surface that intersect perpendicularly; the top sealing edge of the battery cell is bent and attached to the tab edge, and the side sealing edge of the battery cell is bent and attached to the side surface; the end of one of the top sealing edge and the side sealing edge forms a folded edge that bends and attaches to the other, and the end of the other has a bend, the folded edge and the bend are connected and stacked to form a convex hull;

[0008] The protective frame has at least one mounting cavity, and the battery cell is placed inside the mounting cavity; each mounting cavity has a positioning groove on its inner side, and the protrusion and the positioning groove are in a concave-convex fit.

[0009] In some embodiments, the folded edge is a bent edge provided at both ends of the top edge, and the bent edge is bent and attached to the side surface; the folded corner is a top folded corner provided at the top of the side edge, and the top folded corner is located outside the bent edge; the convex hull is a side convex hull formed by connecting the top folded corner and the bent edge and stacking them on the side surface.

[0010] In some embodiments, the inner side of the positioning groove includes a connected positioning plane and a transition slope; the outer side of the side protrusion includes a connected abutting plane and a connecting slope; the positioning plane abuts against the abutting plane, and an airflow gap is formed between the transition slope and the connecting slope.

[0011] In some embodiments, the electrode ear surface includes a top sealing deep pit side and a top sealing shallow pit side respectively disposed on both sides of the top sealing edge;

[0012] The battery cell's tabs are sealed to the top seal edge with tab adhesive; the tabs include a first bending portion and a second bending portion, the first bending portion extends vertically from the shallow pit side of the top seal to the deep pit side of the top seal, and the second bending portion extends vertically away from the tab surface.

[0013] In some embodiments, the extension length of the side bulge along the second direction and the unfolded width of the side seal along the third direction satisfy the following condition: L≥M, where L is the extension length of the side bulge along the second direction and M is the unfolded width of the side seal along the third direction; the second direction is the length direction of the battery cell and the third direction is the width direction of the battery cell, and the second direction and the third direction are perpendicular to each other.

[0014] And / or, the thickness of the side convex hull relative to the side surface in the third direction satisfies: N≥0.3mm, where N is the thickness of the side convex hull relative to the side surface in the third direction.

[0015] In some embodiments, a spacer rib is formed between any two adjacent mounting cavities; the width of the spacer rib along the third direction and the protrusion thickness of the side bulge along the third direction satisfy: U≥2N, where U is the width of the spacer rib along the third direction and N is the protrusion thickness of the side bulge relative to the side surface in the third direction.

[0016] In some embodiments, the spacer rib is provided with a positioning part, and the two ends of the positioning part are symmetrically provided with positioning grooves;

[0017] The length of the positioning part along the second direction and the extension length of the side convex hull along the second direction satisfy the following condition: V≥L, where V is the length of the positioning part along the second direction and L is the extension length of the side convex hull along the second direction.

[0018] And / or, the maximum depth of the positioning groove along the third direction and the thickness of the side convex hull relative to the side surface in the third direction satisfy: W≥N, where W is the maximum depth of the positioning groove along the third direction and N is the thickness of the side convex hull relative to the side surface in the third direction.

[0019] In some embodiments, the outer side end of the protective frame has a top protrusion, and a positioning groove is formed in the top protrusion; the outer side of the top protrusion protrudes from the outer side of the protective frame in a third direction.

[0020] In some embodiments, a circuit board is embedded in one side of the protective frame, and a connecting piece is formed on the side of the circuit board facing the mounting cavity; after the battery cell is embedded in the mounting cavity, the electrode tab is parallel to the connecting piece, and the electrode tab is fixedly connected to the connecting piece.

[0021] In some embodiments, the protective frame is covered with a surface insulating protective film and a bottom insulating protective film on both sides, and all the battery cells are located between the surface insulating protective film and the bottom insulating protective film.

[0022] Compared to the prior art, this utility model bends the sealing edge of the battery cell, so that the top sealing edge is bent and attached to the tab surface of the battery cell, and the side sealing edge is bent and attached to the side surface of the battery cell. This reduces the space occupied by the traditional top sealing edge at the head of the battery cell, thus affecting the space utilization of the battery pack. In addition, the bent battery cell is embedded in the mounting cavity, thereby reducing the assembly gap between the battery cell and the mounting cavity. This allows the optimized battery cell to be more compactly embedded in the mounting cavity of the protective frame, shortening the length of the battery cell and increasing the space utilization.

[0023] Furthermore, the top sealing edge has bent sealing edges extending beyond the tab surface at both ends, with the bent sealing edges bent and attached to the side surface; the top of the side sealing edge has a top bend, which connects with the bent sealing edge and stacks to form a side bulge. Each mounting cavity has a positioning groove on its inner side, and the side bulge and the positioning groove fit together to constrain the battery cell, restricting its movement within the mounting cavity, thus ensuring the battery cell is stably fixed within the mounting cavity and providing stronger impact resistance.

[0024] Therefore, this utility model adopts a combination of bending and sealing edge and snap-fit ​​fixing to compactly fix the battery cell in the mounting cavity of the protective frame, effectively improving the space utilization and impact resistance of the battery cell. Attached Figure Description

[0025] 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 embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0026] Figure 1 An exploded view of the battery pack provided in an embodiment of this utility model;

[0027] Figure 2 for Figure 1 A structural diagram of the battery cell in the image;

[0028] Figure 3 for Figure 2 A magnified view of part A in the image;

[0029] Figure 4 for Figure 1 A schematic diagram showing the connection between the battery cell and the circuit board;

[0030] Figure 5 for Figure 4 A magnified view of part B in the image;

[0031] Figure 6 for Figure 4 Side view;

[0032] Figure 7 for Figure 2 The main view;

[0033] Figure 8 for Figure 7 A magnified view of part D;

[0034] Figure 9 for Figure 7 C-axis sectional view;

[0035] Figure 10 for Figure 9 A magnified view of part E in the image;

[0036] Figure 11 for Figure 2 A diagram showing the state of the cell when the top seal, side seal, and tabs are not bent.

[0037] Figure 12 for Figure 11 Side view;

[0038] Figure 13 for Figure 12 A magnified view of part of F;

[0039] Figure 14 for Figure 11 Axonometric drawing;

[0040] Figure 15 for Figure 14 A diagram showing the state of the top edge sealing after bending.

[0041] Figure 16 for Figure 15A diagram showing the state of the edge banding when it is bent and attached to the side surface;

[0042] Figure 17 for Figure 16 A magnified view of a portion of G;

[0043] Figure 18 for Figure 16 A diagram showing the state of the center side edge banding after bending.

[0044] Figure 19 for Figure 18 Diagram showing the state of the middle pole ear after bending;

[0045] Figure 20 for Figure 1 The main view of the middle border;

[0046] Figure 21 for Figure 20 A magnified view of part of H;

[0047] Figure 22 for Figure 20 A magnified view of part I;

[0048] Figure 23 for Figure 20 Side view;

[0049] Figure 24 for Figure 1 A schematic diagram showing the connection between the battery cell and the circuit board;

[0050] Figure 25 This is a structural diagram of the battery pack provided in an embodiment of the present utility model;

[0051] Figure 26 for Figure 25 Side view;

[0052] Figure 27 for Figure 26 Exploded view.

[0053] The attached figures are labeled as follows:

[0054] 1. Battery cell; 2. Protective frame; 3. Airflow gap; 4. Circuit board; 5. Surface insulating protective film; and 6. Bottom insulating protective film.

[0055] 11. Electrode surface, 12. Side surface, 13. Top sealing edge, 14. Side sealing edge, 15. Side convex bump, 16. Electrode, 17. Electrode adhesive, and 18. Front side surface;

[0056] Folded edge 101, folded corner 102, and convex hull 103;

[0057] 111 on the side of the deep pit and 112 on the side of the shallow pit;

[0058] Abutting plane 151 and connecting inclined plane 152;

[0059] Mounting cavity 21, positioning groove 22, spacer rib 23, positioning frame 24 and top protrusion 25;

[0060] Positioning plane 221 and transition slope 222;

[0061] Positioning unit 231;

[0062] Connecting piece 41 and connector terminal 42. Detailed Implementation

[0063] 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.

[0064] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0065] This utility model discloses a battery pack, as shown in the attached figure. Figure 1 As shown, the device includes a battery cell 1 and a protective frame 2. The battery cell 1 includes at least one component. Each battery cell 1 is composed of a positive electrode, a separator, and a negative electrode, which are wound or stacked together to store and release electrical energy. The outer surface of each battery cell 1 includes perpendicularly intersecting tab surfaces 11 and side surfaces 12, wherein the tab surfaces 11 are located at the top of the battery cell 1, and the side surfaces 12 are located on the left and right sides of the battery cell 1, as shown in the attached diagram. Figure 2 As shown.

[0066] The assembled battery cell 1 is placed in an aluminum-plastic film and then heat-sealed to ensure the film is tightly closed, isolating the battery cell 1 from the outside environment and preventing electrolyte leakage and external contamination. The edges of the aluminum-plastic film are bonded together to form a top seal 13 and a side seal 14, as shown in the attached diagram. Figure 2 and 3 As shown, the top sealing edge 13 is located on the tab surface 11 of the cell 1, and the side sealing edge 14 is located on the side surface 12 of the cell 1. The vertical distance between the top sealing edge 13 and the tab surface 11 ranges from 2.5mm to 3.5mm.

[0067] This utility model involves bending the sealing edge of the battery cell 1, as shown in the attached figure. Figures 11 to 18As shown, the top sealing edge 13 is bent and attached to the tab surface 11 of the cell 1, and the side sealing edge 14 is bent and attached to the side surface 12 of the cell 1. This reduces the space occupied by the traditional top sealing edge at the head of the cell, thus affecting the space utilization of the battery pack. In addition, the bent cell 1 is embedded in the mounting cavity 21, thereby reducing the assembly gap between the cell 1 and the mounting cavity 21. This allows the optimized cell 1 to be more compactly embedded in the mounting cavity 21 of the protective frame 2, shortening the length of the cell 1 and increasing the space utilization.

[0068] The protective frame 2 has at least one mounting cavity 21, and the battery cell 1 is placed in the mounting cavity 21. In a preferred embodiment, the protective frame 2 specifically has three mounting cavities 21, and the three battery cells 1 are respectively mounted in the three mounting cavities 21 in a one-to-one correspondence. All battery cells 1 are distributed linearly at equal intervals. Of course, the specific number of battery cells 1 can be adaptively adjusted according to the design requirements of the battery pack, and no specific adjustment is made here.

[0069] As attached Figure 17 As shown, the outer surface of each cell 1 includes a tab surface 11 and a side surface 12 that intersect perpendicularly; one end of the top sealing edge 13 and the side sealing edge 14 of the cell 1 has a folded edge 101 that bends and attaches to the other, and the other end has a bend angle 102. The folded edge 101 and the bend angle 102 are connected and stacked to form a convex bulge 103, as shown in the attached figure. Figure 2 and 3 As shown; each mounting cavity 21 has a positioning groove 22 on its inner side, as shown in the attached figure. Figure 1 As shown; the convex bulge 103 and the positioning groove 22 are in a concave-convex fit, as shown in the attached figure. Figure 4 As shown, the battery cell 1 is constrained, restricting its movement within the mounting cavity 21, thus ensuring its stable fixation within the cavity and enhancing its impact resistance.

[0070] Therefore, this utility model adopts a combination of bending and sealing edge and snap-fit ​​fixing to make the battery cell 1 compactly fixed in the mounting cavity 21 of the protective frame 2, effectively improving the space utilization and impact resistance of the battery cell 1.

[0071] In a preferred embodiment, the folded edge 101 is a bent edge located at both ends of the top sealing edge 13, with the bent edge folded towards the side surface 12; the folded corner 102 is a top folded corner located at the top of the side sealing edge 14, with the top folded corner located on the outside of the bent edge; the protrusion 103 is a side protrusion 15 formed by connecting the top folded corner and the bent edge and stacking them on the side surface 12, with the side protrusion 15 engaging with the positioning groove 22, as shown in the attached figure. Figure 4 As shown, the movement of the battery cell 1 within the mounting cavity 21 is restricted, thereby improving the impact resistance of the battery cell 1.

[0072] As a preferred embodiment, as shown in the appendix Figure 4 and5 As shown, the inner surface of the positioning groove 22 includes a connecting positioning plane 221 and a transition slope 222; the outer surface of the side protrusion 15 includes a connecting abutment plane 151 and a connecting slope 152; the positioning plane 221 abuts against the abutment plane 151, and an airflow gap 3 is formed between the transition slope 222 and the connecting slope 152. When an abnormality occurs inside the battery cell 1, the battery cell 1 expands and generates a large amount of gas. After the gas reaches the critical value that the battery cell 1 can withstand, it will be released through the airflow gap 3, which helps to improve the safety of the battery cell 1. Specifically, the end of the connecting slope 152 near the abutment plane 151 abuts against the positioning plane 221.

[0073] In a preferred embodiment, the side protrusion 15 and the positioning groove 22 are bonded together by an adhesive layer, so that the battery cell 1 and the mounting cavity 21 are tightly attached together, further improving the battery's impact resistance. Specifically, adhesive is applied between the positioning plane 221 and the abutment plane 151, and the adhesive layer is formed after curing, preventing the adhesive from blocking the airflow gap 3.

[0074] As a preferred embodiment, the tab surface 11 includes a deep pit side 111 and a shallow pit side 112 respectively disposed on both sides of the top sealing edge 13, as shown in the attached figure. Figure 10 As shown. In the first direction, the width of the deep pit side 111 of the top seal is greater than the width of the shallow pit side 112 of the top seal. The tab 16 of the battery cell 1 is sealed to the top seal edge 13 by tab adhesive 17, which can effectively improve the overall performance and safety of the battery cell 1.

[0075] As attached Figure 14 and 15 As shown, the electrode lug 16 includes a first bend and a second bend. The first bend extends vertically from the shallow pit side 112 of the top seal to the deep pit side 111 of the top seal, and the second bend extends vertically away from the electrode lug surface 11. That is, after the top seal edge 13 bends vertically from the shallow pit side 112 to the deep pit side 111 of the top seal, the electrode lug 16 bends vertically away from the electrode lug surface 11, as shown in the attached figure. Figure 19 As shown, the tab 16 is perpendicular to the tab surface 11. By bending the top seal 13 and the tab 16 successively, the top seal 13 is bent, which makes the aluminum-plastic film encapsulation of the cell 1 more compact and effectively reduces the length of the entire battery pack. This can improve the energy density of the cell 1 and improve the space utilization of the cell 1.

[0076] As attached Figures 15 to 17 As shown, the bending direction of the side sealing edge 14 is a vertical bend from the shallow pit side 112 of the top sealing edge to the deep pit side 111 of the top sealing edge, and it is in contact with the bent sealing edge; that is, after the bent sealing edge is bent and attached to the side surface 12, the side sealing edge 14 bends vertically from the shallow pit side 112 of the top sealing edge to the deep pit side 111 of the top sealing edge, until the side sealing edge 14 is tightly attached to the side surface 12, as shown in the attached figure. Figure 18As shown, this effectively shortens the width of the battery cell 1, and also improves the energy density and space utilization of the battery cell 1. Since the side seal 14 is only the thickness of aluminum-plastic film, its bending stress is small, and the side seal 14 is close to the side surface 12 of the battery cell 1.

[0077] It should be noted that, as shown in the attached document... Figures 11 to 19 As shown, the top sealing edge 13, side sealing edge 14, and electrode tab 16 are bent in sequence. Specifically, the top sealing edge 13 of the battery cell 1 is first bent vertically from the shallow pit side 112 to the deep pit side 111, then the bent sealing edges at both ends of the top sealing edge 13 are bent and attached to the side surface 12, then the side sealing edge 14 is bent vertically from the shallow pit side 112 to the deep pit side 111, with the side sealing edge 14 tightly attached to the side surface 12, and finally the electrode tab 16 is bent vertically away from the electrode tab surface 11, thus completing the bending of the aluminum-plastic film of the battery cell 1.

[0078] As a preferred embodiment, as shown in the appendix Figure 9 and 10 As shown, the battery cell 1 includes a front side surface 18 perpendicularly connected to the top sealing pit side 111; the vertical distance between the electrode tab 16 and the front side surface 18 along the first direction satisfies: J≥0, where J is the vertical distance between the electrode tab 16 and the front side surface 18 along the first direction; this ensures that the electrode tab 16 does not exceed the front side surface 18, preventing the battery cell 1 from tilting up in the mounting cavity 21 and causing it to be improperly installed, ensuring that the rear side of the battery cell 1 is fully fitted with the mounting cavity 21, and improving the impact resistance of the battery cell 1. The first direction in this text refers to the thickness direction of the battery cell 1, specifically the direction of the thickness of the electrode tab 1. Figure 2 The y-axis direction in the diagram.

[0079] As a preferred embodiment, as shown in the appendix Figure 9 and 10 As shown, after the top sealing edge 13 is bent vertically from the shallow pit side 112 to the deep pit side 111, the vertical distance between the top sealing edge 13 and the deep pit side 111 along the second direction satisfies: K = 0.6 mm, where K is the vertical distance between the top sealing edge 13 and the deep pit side 111 along the second direction. Although a smaller K value results in higher space utilization of the battery cell 1, due to the bending stress of the tab 16, K is preferably 0.6 mm. This ensures optimal space utilization of the battery cell 1 while preventing the tab 16 from breaking due to excessive bending stress. The second direction in this text refers to the length direction of the battery cell 1, specifically the direction of the attached... Figure 2 The z-axis direction is perpendicular to the first direction.

[0080] As a preferred embodiment, as shown in the appendix Figure 8 and 11As shown, the extension length of the side protrusion 15 along the second direction and the unfolded width of the side seal 14 along the third direction satisfy the following condition: L ≥ M, where L is the extension length of the side protrusion 15 along the second direction and M is the unfolded width of the side seal 14 along the third direction. This ensures that the extension length of the side protrusion 15 is sufficient, ensuring that the battery cell 1 is stably fixed in the mounting cavity 21, and that the battery cell 1 has stronger impact resistance. The third direction in this text refers to the width direction of the battery cell 1, specifically the direction of the side seal 1. Figure 2 The x-axis direction in the diagram. The first direction, the second direction, and the third direction are all perpendicular to each other.

[0081] And / or, as attached Figure 8 As shown, the thickness of the side protrusion 15 relative to the side surface 12 in the third direction satisfies: N≥0.3mm, where N is the thickness of the side protrusion 15 relative to the side surface 12 in the third direction. This ensures that the side protrusion 15 forms a rigid reinforced structure in the third direction, which can effectively resist the lateral stress of the battery pack during assembly or use, prevent deformation of the side protrusion 15 or displacement of the internal electrode due to external forces, and ensure the structural stability of the cell 1.

[0082] As a preferred embodiment, as shown in the appendix Figure 7 , 11 As shown in Figure 20, the length of the mounting cavity 21 along the second direction and the length of the battery cell 1 along the second direction after the sealing edge is bent satisfy the following: O ≥ R, where O is the length of the mounting cavity 21 along the second direction and R is the length of the battery cell 1 along the second direction after the sealing edge is bent; the width of the mounting cavity 21 along the third direction and the width of the battery cell 1 along the third direction after the sealing edge is bent satisfy the following: P ≥ S, where P is the width of the mounting cavity 21 along the third direction and S is the width of the battery cell 1 along the third direction after the sealing edge is bent; the depth of the mounting cavity 21 along the first direction and the thickness of the battery cell 1 along the first direction satisfy the following: Q ≥ T, where Q is the depth of the mounting cavity 21 along the first direction and T is the thickness of the battery cell 1 along the first direction. In this way, an assembly gap is formed between the mounting cavity 21 and the battery cell 1, which can eliminate the risk of forced extrusion caused by manufacturing tolerances, improve assembly efficiency and product yield, absorb the collision force of the battery cell 1 during charging and discharging, avoid rigid contact between the battery cell 1 and the mounting cavity 21, which would cause pressure damage to the internal electrode plates, and help extend the cycle life of the battery cell 1. Moreover, the assembly gap can also serve as a flow channel, so that the heat released by the battery cell 1 can be evenly diffused, avoiding local overheating of the battery cell 1, which is conducive to improving the safety of the battery cell 1.

[0083] As a preferred embodiment, as shown in the appendix Figure 8 and 20A spacer rib 23 is formed between any two adjacent mounting cavities 21 to separate adjacent battery cells 1. The width of the spacer rib 23 along the third direction and the thickness of the side protrusion 15 relative to the side surface 12 in the third direction satisfy: U≥2N, where U is the width of the spacer rib 23 along the third direction and N is the thickness of the side protrusion 15 relative to the side surface 12 in the third direction. This design ensures that the spacer rib 23 can provide sufficient rigid support to prevent the battery cells 1 from expanding or being squeezed and deformed, effectively dispersing the expansion force generated during the battery charging and discharging cycle and ensuring the structural stability of the protective frame 2. It also ensures that the spacer rib 23 can fully accommodate the side protrusion 15 of the two adjacent battery cells 1, preventing the two adjacent battery cells 1 from colliding when subjected to external impact due to insufficient thickness of the spacer rib 23.

[0084] As a preferred embodiment, as shown in the appendix Figure 20 As shown, a positioning frame 24 is fixedly provided on one side of the mounting cavity 21. The positioning frame 24 abuts against the rear side of the battery cell 1 and is used to limit the position of the battery cell 1 within the mounting frame along the first direction, so as to prevent the electrode tab 16 from being misaligned due to the positional displacement of the battery cell 1. Specifically, the positioning frame 24 is fixed to the protective frame 2 in an integral molding manner.

[0085] As a preferred embodiment, as shown in the appendix Figure 21 As shown in the attached document Figure 8 and 21 As shown, positioning portions 231 are provided at both ends of the spacer rib 23, and positioning grooves 22 are symmetrically provided at both ends of the positioning portions 231. The length of the positioning portion 231 along the second direction and the extension length of the side protrusion 15 along the second direction satisfy: V≥L, where V is the length of the positioning portion 231 along the second direction and L is the extension length of the side protrusion 15 along the second direction; this ensures that the positioning portion 231 completely covers the side protrusion 15, and ensures that the mechanical engagement between the side protrusion 15 and the positioning portion 231 can effectively prevent the cell 1 from shifting under vibration or impact conditions, reducing the risk of frictional loss between the side protrusion 15 and the spacer rib 23.

[0086] And / or, as attached Figure 8 , 21 As shown in Figure 22, the maximum depth of the positioning groove 22 along the third direction and the protrusion thickness of the side protrusion 15 relative to the side surface 12 in the third direction satisfy the following condition: W ≥ N, where W is the maximum depth of the positioning groove 22 along the third direction and N is the protrusion thickness of the side protrusion 15 relative to the side surface 12 in the third direction. When the battery cell 1 is charging and discharging, the side protrusion 15 can be slightly displaced within the positioning groove 22 without disengaging from the snap-fit, thus avoiding rigid compression between the battery cell 1 and the mounting cavity 21, which could lead to cracking of the side sealing edge 14 and ensure the sealing integrity of the aluminum-plastic film.

[0087] As a preferred embodiment, as shown in the appendix Figure 25 As shown, the outer side of the protective frame 2 has a top protrusion 25, and the positioning groove 22 is formed in the top protrusion 25. The outer side of the top protrusion 25 protrudes from the outer side of the protective frame 2 in a third direction, so as to ensure that the outermost frame of the protective frame 2 can still be connected to the battery cell 1 to prevent the battery cell 1 from shifting.

[0088] As a preferred embodiment, as shown in the appendix Figure 24 As shown, a circuit board 4 is embedded in one side of the protective frame 2, and a connecting piece 41 is formed on the side of the circuit board 4 facing the mounting cavity 21. After the battery cell 1 is embedded in the mounting cavity 21, the electrode tab 16 is parallel to the connecting piece 41, and the electrode tab 16 is fixedly connected to the connecting piece 41, so that the circuit board 4 and each battery cell 1 are reliably electrically connected. Specifically, the connecting piece 41 is a nickel sheet, copper sheet or aluminum sheet, and is stacked with the electrode tab 16. The connecting piece 41 and the electrode tab 16 are firmly connected by laser welding, resistance welding or soldering.

[0089] A connector terminal 42 is fixedly provided on the end of the circuit board 4 away from the connecting piece 41, as shown in the attached diagram. Figure 24 As shown, it serves as the hub for external electrical transmission connections. The connecting piece 41 and the connector terminal 42 are arranged separately to achieve signal isolation and ensure stable signal transmission. In addition, the circuit board 4 also contains resistors, transistors, and other components, which can be adjusted according to the design requirements of the battery pack, and are not specifically limited here.

[0090] As a preferred embodiment, as shown in the appendix Figures 25 to 27 As shown, the protective frame 2 is covered with a surface insulating protective film 5 and a bottom insulating protective film 6 on both sides. All the battery cells 1 are located between the surface insulating protective film 5 and the bottom insulating protective film 6, forming a double-film sandwich structure, which completely covers all the battery cells 1, improves the insulation of the battery pack, prevents the battery cells 1 from short-circuiting with the battery compartment due to scratches, and at the same time limits the position of each battery cell 1, ensuring that the battery cell 1 is more firmly connected and improving the reliability of the battery pack.

[0091] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0092] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A battery pack, characterized in that, include: A battery cell (1) includes at least one; the outer surface of each battery cell (1) includes a tab surface (11) and a side surface (12) that intersect perpendicularly; the top sealing edge (13) of the battery cell (1) is bent and attached to the tab surface (11), and the side sealing edge (14) of the battery cell (1) is bent and attached to the side surface (12); the end of one of the top sealing edge (13) and the side sealing edge (14) is formed with a folded edge (101) that is bent and attached to the other, and the end of the other has a bend (102); the folded edge (101) and the bend (102) are connected and stacked to form a convex bulge (103). The protective frame (2) has at least one mounting cavity (21), and the battery cell (1) is placed in the mounting cavity (21); each mounting cavity (21) has a positioning groove (22) on its inner side, and the protrusion (103) and the positioning groove (22) are in concave-convex fit.

2. The battery pack according to claim 1, characterized in that, The folded edge (101) is a bent edge provided at both ends of the top sealing edge (13), and the bent edge is bent and attached to the side surface (12); the folded corner (102) is a top folded corner provided at the top of the side sealing edge (14), and the top folded corner is provided on the outside of the bent edge; the convex bulge (103) is a side convex bulge (15) formed by connecting the top folded corner and the bent edge and stacking them on the side surface (12).

3. The battery pack according to claim 2, characterized in that, The inner side of the positioning groove (22) includes a connected positioning plane (221) and a transition slope (222); the outer side of the side protrusion (15) includes a connected abutting plane (151) and a connecting slope (152); the positioning plane (221) abuts against the abutting plane (151), and an airflow gap (3) is formed between the transition slope (222) and the connecting slope (152).

4. The battery pack according to claim 3, characterized in that, The electrode ear surface (11) includes a top sealing deep pit side (111) and a top sealing shallow pit side (112) respectively provided on both sides of the top sealing edge (13). The tab (16) of the battery cell (1) is sealed to the top seal edge (13) by tab adhesive (17); the tab (16) includes a first bending portion and a second bending portion, the first bending portion extends vertically from the shallow pit side (112) of the top seal to the deep pit side (111) of the top seal, and the second bending portion extends vertically away from the tab surface (11).

5. The battery pack according to claim 4, characterized in that, The extension length of the side bulge (15) along the second direction and the unfolded width of the side seal (14) along the third direction satisfy the following condition: L≥M, where L is the extension length of the side bulge (15) along the second direction and M is the unfolded width of the side seal (14) along the third direction; the second direction is the length direction of the battery cell (1) and the third direction is the width direction of the battery cell (1), and the second direction and the third direction are perpendicular to each other; And / or, the thickness of the side bulge (15) relative to the side surface (12) in the third direction satisfies: N≥0.3mm, where N is the thickness of the side bulge (15) relative to the side surface (12) in the third direction.

6. The battery pack according to claim 5, characterized in that, A spacer rib (23) is formed between any two adjacent mounting cavities (21); the width of the spacer rib (23) along the third direction and the thickness of the side protrusion (15) relative to the side surface (12) in the third direction satisfy: U≥2N, where U is the width of the spacer rib (23) along the third direction and N is the thickness of the side protrusion (15) relative to the side surface (12) in the third direction.

7. The battery pack according to claim 6, characterized in that, The spacer rib (23) is provided with a positioning part (231), and the positioning grooves (22) are symmetrically provided at both ends of the positioning part (231). The length of the positioning part (231) along the second direction and the extension length of the side convex hull (15) along the second direction satisfy the following: V≥L, where V is the length of the positioning part (231) along the second direction and L is the extension length of the side convex hull (15) along the second direction. And / or, the maximum depth of the positioning groove (22) along the third direction and the protrusion thickness of the side bulge (15) relative to the side surface (12) in the third direction satisfy: W≥N, where W is the maximum depth of the positioning groove (22) along the third direction and N is the protrusion thickness of the side bulge (15) relative to the side surface (12) in the third direction.

8. The battery pack according to claim 5, characterized in that, The outer side end of the protective frame (2) is provided with a top protrusion (25), and the positioning groove (22) is formed in the top protrusion (25); the outer side of the top protrusion (25) protrudes from the outer side of the protective frame (2) along the third direction.

9. The battery pack according to claim 4, characterized in that, A circuit board (4) is embedded in one side of the protective frame (2), and a connecting piece (41) is formed on the side of the circuit board (4) facing the mounting cavity (21); after the battery cell (1) is embedded in the mounting cavity (21), the electrode (16) is parallel to the connecting piece (41), and the electrode (16) is fixedly connected to the connecting piece (41).

10. The battery pack according to any one of claims 1 to 9, characterized in that, The protective frame (2) is covered with a surface insulating protective film (5) and a bottom insulating protective film (6) on both sides, and all the battery cells (1) are located between the surface insulating protective film (5) and the bottom insulating protective film (6).

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