Battery cell structure and battery
By using a metal layer thermally fused to form a sealing section in the cell structure, the problem of the large space occupied by the cell structure in the vertical plane of the thickness direction is solved, and the energy density of the cell structure is improved.
Patent Information
- Application Number
- CN202423225304.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2034-12-25
AI Technical Summary
The cell structure of a pouch battery occupies a large space in a plane perpendicular to the thickness direction of the cell structure, which leads to a decrease in energy density.
The sealing part is formed by hot-melting a metal layer, which replaces the hot-melt sealing of the polypropylene layer of aluminum-plastic film. This reduces the sealing edge length and allows the sealing edge to be folded towards the thickness direction of the battery cell structure, thus avoiding the sealing edge from exceeding the thickness requirements of the battery cell structure.
This improves the energy density of the battery cell structure and reduces the space occupied in the vertical plane of the battery cell structure's thickness direction.
Smart Images
Figure CN223871564U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and in particular to a cell structure and a battery. Background Technology
[0002] With the advancement of technology and the advent of the wave of intelligentization, miniaturized devices are becoming increasingly popular. As devices become smaller, the required thickness of batteries also decreases.
[0003] In related technologies, the casing of a pouch cell achieves sealing through the fusion of polypropylene (PP) layers within an aluminum-plastic film. During the cell encapsulation process, the cell body is placed within a recess in the aluminum-plastic film. The film is then bent to cover the recess and seal the three edges. However, if the edges are folded towards the thickness direction of the cell, their length exceeds the required thickness, affecting assembly. Therefore, the edges are not folded; they remain perpendicular to the thickness direction. However, this perpendicular plane occupies a large space, reducing the cell's energy density. Utility Model Content
[0004] This utility model provides a cell structure and battery to solve the problem that the large space occupied by the cell structure in a plane perpendicular to the thickness direction of the cell structure leads to a decrease in the energy density of the cell structure.
[0005] On one hand, this utility model embodiment provides a battery cell structure, including:
[0006] Battery cell body;
[0007] A battery cell housing, the battery cell housing comprising a housing body and a sealing edge, the housing body being provided with a receiving cavity for accommodating the battery cell body;
[0008] The housing body includes a first wall and a second wall, which together form the receiving cavity. Both the first wall and the second wall include the polymer layer, the metal layer and the polypropylene layer stacked sequentially.
[0009] The sealing edge is connected to the edge of the housing body;
[0010] The edge sealing includes two edge sealing bodies, each edge sealing body including a polymer layer and a metal layer stacked together, at least a portion of the metal layers of the two edge sealing bodies are thermally fused to form a sealing portion, the sealing portion sealing the receiving cavity.
[0011] In one possible implementation, the sealing edge is provided with a non-sealing portion, and the non-sealing portion is provided on at least one side of the sealing portion in the thickness direction of the cell structure.
[0012] In one possible implementation, in the direction perpendicular to the sealing edge, the thickness of the non-sealing portion is greater than the thickness of the sealing portion, and the thickness of the non-sealing portion is the sum of the thicknesses of the two polymer layers and the two metal layers; and / or,
[0013] The difference between the thickness of the non-sealing portion and the thickness of the sealing portion is 20% to 40% of the thickness of the two metal layers.
[0014] In one possible implementation, in the thickness direction of the cell structure, the thickness of the cell casing is greater than or equal to 1.3 mm; and / or, the length of the sealing edge is greater than or equal to 1.3 mm; and / or, the length of the sealing portion is greater than or equal to 0.3 mm.
[0015] In one possible implementation, the housing body is provided with a bent portion connected to the edge sealing.
[0016] In one possible implementation, the bending portion includes two polymer layers, two metal layers, and two polypropylene layers, with the two polypropylene layers in contact and the ends of the two polypropylene layers facing the sealing edge being heat-fused, and the heat-fused portions of the two polypropylene layers being arranged in a triangular shape.
[0017] In one possible implementation, the end of the sealing edge away from the bend is wrapped with a first adhesive, the first adhesive including the end of the sealing edge away from the cell body.
[0018] In one possible implementation, a second adhesive is provided between the edge seal and the cell housing, the second adhesive bonding the housing body and the edge seal.
[0019] In one possible implementation, the cell housing includes a plurality of said sealing edges, which are connected along one edge of the housing body on one side of the cell structure in the thickness direction.
[0020] On the other hand, this utility model embodiment provides a battery, including the cell structure described above.
[0021] This utility model provides a cell structure and battery. The edge sealing includes two edge sealing bodies. Each edge sealing body includes a polymer layer and a metal layer stacked together. At least part of the metal layers of the two edge sealing bodies are thermally fused to form a sealing part, which can reduce the required length of the edge sealing. Thus, the edge sealing can be folded towards the thickness direction of the cell structure, and the length of the edge sealing will not exceed the required thickness of the cell structure. This reduces the space occupied by the cell structure in a plane perpendicular to the thickness direction of the cell structure, thereby improving the energy density of the cell structure. Attached Figure Description
[0022] 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0023] Figure 1 This is a schematic diagram of aluminum-plastic film in the prior art;
[0024] Figure 2 This is a schematic diagram of a battery cell structure in the prior art;
[0025] Figure 3 for Figure 2 A schematic diagram of the existing edge sealing process before sealing;
[0026] Figure 4 This is a schematic diagram of the battery cell structure provided in Embodiment 1 of this utility model;
[0027] Figure 5 for Figure 4 A schematic diagram of the edge sealing process before the process begins;
[0028] Figure 6 for Figure 4 Enlarged cross-section diagram at point A in the diagram;
[0029] Figure 7 for Figure 2 Enlarged cross-section diagram at point B;
[0030] Figure 8 This is a schematic diagram of the battery cell structure provided in Embodiment 2 of this utility model.
[0031] Explanation of reference numerals in the attached figures:
[0032] 1-Polymer layer; 2-Metal layer; 3-Polypropylene layer; 20a-Existing edge sealing; 21a-Existing sealed portion; 22a-Existing unsealed portion; 10-Cell housing; 101-Receiving cavity; 11-Housing body; 111-First wall; 112-Second wall; 113-Bending portion; 20-Edge sealing; 201-Edge sealing body; 21-Sealed portion; 22-Unsealed portion; 30-First adhesive; 40-Second adhesive. Detailed Implementation
[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0034] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between the components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0036] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0037] In the above description, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0038] As described in the background section, the battery cell structure occupies a large space in a plane perpendicular to the thickness direction of the cell structure, resulting in a decrease in the energy density of the cell structure. The inventors have discovered that the reason for this problem is... (See also...) Figures 1 to 3 As shown, in the prior art, the existing edge sealing 20a of the battery cell structure achieves sealing through the fusion of polypropylene layers of the aluminum-plastic film. The required length of the existing edge sealing 20a is greater than or equal to 1.9 mm. When the required thickness of the battery cell structure is less than 1.9 mm, after the existing edge sealing 20a is folded, it extends along the thickness direction of the battery cell structure, causing its length to exceed the required thickness. Therefore, the edge sealing 20a of the battery cell structure is not folded, and the existing edge sealing is located in a plane perpendicular to the thickness direction of the battery cell structure. The battery cell structure occupies a large space in the plane perpendicular to the thickness direction of the battery cell structure, resulting in a decrease in the energy density of the battery cell structure.
[0039] To address the aforementioned issues, this utility model provides a cell structure and battery. Since the sealing performance of two metal layers after hot-melting is stronger than that of two polypropylene layers after hot-melting, replacing the polypropylene layer hot-melt sealing of the aluminum-plastic film with the metal layer hot-melt sealing of the aluminum-plastic film at the edge reduces the required edge length. This allows the edge to be folded towards the thickness direction of the cell structure, and the edge length will not exceed the required thickness of the cell structure. This reduces the space occupied by the cell structure in a plane perpendicular to the thickness direction of the cell structure, thereby improving the energy density of the cell structure.
[0040] The cell structure and battery provided in this utility model embodiment will be described in detail below with reference to specific embodiments.
[0041] This utility model provides a cell structure for use in batteries. See also... Figure 4 As shown, the thickness direction of the battery cell structure is the X-axis direction.
[0042] The cell structure may include a cell body (not shown in the figure). For example, the cell body may be a wound core formed by winding a positive electrode, a separator, and a negative electrode. Alternatively, the cell body may be a stacked core composed of multiple positive electrode sheets, multiple separators, and multiple negative electrode sheets.
[0043] See Figure 4 As shown, the cell structure may include a cell housing 10.
[0044] The cell housing 10 may include a housing body 11 and a sealing edge 20.
[0045] The housing body 11 is provided with a receiving cavity 101, which receives the battery cell body.
[0046] The edge sealing 20 is connected to the edge of the housing body 11.
[0047] See Figure 5 As shown, the edge sealing 20 includes two edge sealing bodies 201 before sealing. Each edge sealing body 201 includes a polymer layer 1 and a metal layer 2 stacked together.
[0048] In some examples, the aluminum-plastic film includes a polymer layer 1, a metal layer 2, and a polypropylene layer 3 stacked sequentially (see [reference]). Figure 1 (As shown). The polypropylene layer 3 of the aluminum-plastic film can be removed to form the edge-sealing body 201. The polymer layer 1 can be a nylon layer. The metal layer 2 can be an aluminum layer.
[0049] exist Figure 6 In the top-to-bottom direction, the portion between the second and third dotted lines is the sealing section 21. At least a portion of the metal layers 2 of the two sealing bodies 201 are thermally fused to form the sealing section 21. The sealing section 21 seals the receiving cavity 101.
[0050] In some examples, under welding pressure, the two sealing bodies 201 are pressed between the upper and lower electrodes. The current flows through the metal layer 2 region and generates resistance heat, heating the metal layer 2 to a local melting state, achieving interatomic bonding and completing the seal.
[0051] The battery cell structure provided in this embodiment of the utility model forms a sealing part 21 by thermally fusing at least a portion of the metal layer 2 of two sealing bodies 201. This reduces the required length of the sealing edge 20, allowing the sealing edge 20 to be folded towards the thickness direction of the battery cell structure. The length of the sealing edge 20 will not exceed the required thickness of the battery cell structure, reducing the space occupied by the battery cell structure in a plane perpendicular to the thickness direction of the battery cell structure, thereby improving the energy density of the battery cell structure.
[0052] In one possible implementation, the cell housing 10 includes a plurality of sealing edges 20 connected along the edge of the housing body 11 on one side of the cell structure in the thickness direction.
[0053] In some examples, an aluminum-plastic film is used to form a recess, and the battery cell body of the battery cell structure is placed in the recess of the aluminum-plastic film. After the aluminum-plastic film is bent to cover the recess, a receiving cavity 101 and three sealing edges 20 are formed. The three sealing edges 20 are connected in sequence, and at least part of the metal layer 2 of the two sealing body 201 of each sealing edge 20 is thermally fused to form a sealing part 21, thereby sealing the three sealing edges 20. The three sealing edges 20 extend along the thickness direction of the battery cell structure.
[0054] exist Figure 6 In the top-to-bottom direction, the part between the first and second dotted lines is the non-sealed part 22, and the part between the third and fourth dotted lines is also the non-sealed part 22.
[0055] In one possible implementation, the edge sealing 20 is provided with a non-sealing portion 22. In some examples, portions of the two edge sealing bodies 201 are fused together by heat to form a sealing portion 21, and the portions of the two edge sealing bodies 201 that are not fused together by heat are non-sealing portions 22. It is understood that the metal layer 2 of the non-sealing portion 22 is not fused by heat.
[0056] In the thickness direction of the cell structure, at least one side of the sealing portion 21 is provided with a non-sealing portion 22. With this arrangement, in the thickness direction of the cell structure, the length L1 of the sealing edge 20 is greater than the length L2 of the sealing portion 21, thereby ensuring the integrity of the length L2 of the sealing portion 21 even when there are process tolerances during the sealing process.
[0057] See in some examples Figure 6 As shown, in the thickness direction of the cell structure, non-sealing portions 22 are provided on both sides of the sealing portion 21.
[0058] In one possible implementation, see Figure 6 As shown, in the direction perpendicular to the sealing edge 20, the thickness T1 of the non-sealed portion 22 is greater than the thickness T2 of the sealed portion 21.
[0059] The thickness T1 of the non-sealed part 22 is the sum of the thickness of the two polymer layers 1 and the thickness of the two metal layers 2.
[0060] The difference between the thickness T1 of the non-sealed portion 22 and the thickness T2 of the sealed portion 21 is 20% to 40% of the thickness of the two metal layers 2. That is, the difference between the thickness T1 of the non-sealed portion 22 and the thickness T2 of the sealed portion 21 is greater than or equal to 20% of the thickness of the two metal layers 2, and less than or equal to 40% of the thickness of the two metal layers 2. It can be understood that the thickness of the metal layer after heat melting of the sealed portion 21 is 60% to 80% of the thickness of the two metal layers 2 of the non-sealed portion 22. In other words, the thickness of the two metal layers 2 corresponding to the sealed portion 21 after heat melting is 60% to 80% of the thickness of the two metal layers 2 before heat melting. In other words, the thickness of the two metal layers 2 corresponding to the sealed portion 21 is melted by 20% to 40%.
[0061] When the difference between the thickness T1 of the non-sealing part 22 and the thickness T2 of the sealing part 21 is less than 20% of the thickness of the two metal layers 2, the amount of metal layer 2 corresponding to the sealing part 21 is insufficient, resulting in a decrease in the sealing performance of the sealing part 21. When the difference between the thickness T1 of the non-sealing part 22 and the thickness T2 of the sealing part 21 is greater than 40% of the thickness of the two metal layers 2, the amount of metal layer 2 corresponding to the sealing part 21 is excessive, resulting in a decrease in the structural strength of the sealing part 21. When the difference between the thickness T1 of the non-sealing part 22 and the thickness T2 of the sealing part 21 is greater than or equal to 20% of the thickness of the two metal layers 2 and less than or equal to 40% of the thickness of the two metal layers 2, the amount of metal layer 2 corresponding to the sealing part 21 can be sufficiently melted, improving the sealing performance of the sealing part 21. It can also prevent the amount of metal layer 2 corresponding to the sealing part 21 from being excessively melted, thereby improving the structural strength of the sealing part 21.
[0062] It should be noted that, see Figure 7 As shown, the thickness T3 of the non-sealed portion 22a in the prior art battery cell structure is the thickness of two aluminum-plastic films, that is, the thickness T3 of the non-sealed portion 22a in the prior art battery cell structure is the sum of the thicknesses of the two polymer layers 1, the two metal layers 2, and the two polypropylene layers 3. The thickness T4 of the prior art battery cell structure is the thickness of the existing sealed portion 21a after the thickness of the two aluminum-plastic films is subtracted by 40% to 50% of the thickness of the two polypropylene layers 3. That is, the thickness of the two polypropylene layers 3 corresponding to the existing sealed portion 21a after heat fusion is 50% to 60% of the thickness of the two polypropylene layers 3 before heat fusion. In other words, the thickness of the two polypropylene layers 3 corresponding to the existing sealed portion 21a is 40% to 50% of the thickness after heat fusion. To ensure the sealing performance of the existing battery cell structure, the length of the existing sealing edge 20a is required to be greater than or equal to 1.9 mm in the thickness direction of the battery cell structure, and the length of the existing sealing part 21a is required to be greater than or equal to 0.9 mm, so that the thickness of the battery cell structure in the prior art is greater than or equal to 1.9 mm.
[0063] In one possible implementation, see Figure 4As shown, in the thickness direction of the cell structure, the thickness of the cell housing 10 is greater than or equal to the length of the sealing edge 20.
[0064] In the thickness direction of the battery cell structure, the thickness of the battery cell housing 10 is greater than or equal to 1.3 mm, the length of the sealing edge 20 is greater than or equal to 1.3 mm, and the length of the sealing portion 21 is greater than or equal to 0.3 mm. With this configuration, when the required thickness of the battery cell structure is greater than or equal to 1.3 mm and less than 1.9 mm, the sealing edge 20 can be folded towards the thickness direction of the battery cell structure, and the length of the sealing edge 20 will not exceed the required thickness of the battery cell structure. This reduces the space occupied by the battery cell structure in a plane perpendicular to the thickness direction of the battery cell structure, thereby improving the energy density of the battery cell structure.
[0065] In one possible implementation, see Figure 4 As shown, the housing body 11 includes a first wall 111 and a second wall 112, which together form a receiving cavity 101. In some examples, the first wall 111 has a recess, and the second wall 112 covers the recess, thereby forming the receiving cavity 101.
[0066] The two sealing bodies 201 of the edge sealing 20 are connected to the first wall 111 and the second wall 112 respectively.
[0067] The first wall 111 and the second wall 112 are made of aluminum-plastic film, that is, the first wall 111 and the second wall 112 both include a polymer layer 1, a metal layer 2 and a polypropylene layer 3 stacked in sequence.
[0068] In other embodiments, the housing body 11 includes other parts besides the first wall 111 and the second wall 112. These other parts can be made of aluminum-plastic film, meaning they can include a polymer layer 1, a metal layer 2, and a polypropylene layer 3 stacked sequentially. Alternatively, the other parts can be the portion remaining after removing the polypropylene layer 3 from the aluminum-plastic film, meaning they can also include a polymer layer 1 and a metal layer 2 stacked together.
[0069] In one possible implementation, see Figure 6 As shown, the housing body 11 is provided with a bent portion 113 that connects to the sealing edge 20. With this configuration, the sealing edge 20 can be connected to the bent portion 113 of the housing body 11, ensuring that the sealing edge 20 extends along the thickness direction of the cell structure.
[0070] The bend 113 may consist of a portion of a first wall 111 and a portion of a second wall 112. In some examples, the bend includes two polymer layers 1, two metal layers 2, and two polypropylene layers 3, with the two polypropylene layers 3 in contact. The ends of the two polypropylene layers 3 facing the sealing edge 20 are heat-fused, and the heat-fused portions of the two polypropylene layers 3 are arranged in a triangular shape.
[0071] The difference between the cell structure in Example 2 and the cell structure in Example 1 is that a first adhesive 30 and a second adhesive 40 are added.
[0072] In one possible implementation, see Figure 8 As shown, the end of the sealing edge 20 away from the bend 113 is wrapped with a first adhesive 30. The first adhesive 30 includes the end of the sealing edge 20 away from the battery cell body. The first adhesive can be an insulating adhesive. This arrangement prevents the metal layer 2 on the end face of the sealing edge 20 from short-circuiting with live parts in the electronic device when the battery is installed in the electronic device.
[0073] A second adhesive 40 is provided between the edge seal 20 and the cell housing 10. The second adhesive is bonded between the edge seal 20 and the housing body 11. This arrangement allows the edge seal 20 to be folded and shaped using the second adhesive, ensuring that the edge seal 20 extends along the thickness direction of the cell structure.
[0074] In some examples, the cell structure fabrication includes the following steps:
[0075] 1. Preparation of positive and negative electrode plates
[0076] A positive electrode active material slurry is prepared by uniformly mixing solvent, binder, conductive agent, and positive electrode active material in a certain proportion. A negative electrode active material slurry is prepared by uniformly mixing solvent, binder, conductive agent, and negative electrode active material in a certain proportion.
[0077] It should be noted that the positive electrode active material includes at least one of lithium cobalt oxide, ternary materials, lithium iron phosphate, lithium manganese iron phosphate, and lithium-rich manganese-based materials. Ternary materials include nickel-cobalt-manganese or nickel-cobalt-aluminum. The negative electrode active material includes at least one of graphite, hard carbon, silicon-oxygen materials, and silicon-carbon.
[0078] A positive electrode active material slurry is coated onto a positive electrode current collector, and after drying, rolling, and slitting, a positive electrode sheet is obtained. A negative electrode active material slurry is coated onto a negative electrode current collector, and after drying, rolling, and slitting, a negative electrode sheet is obtained.
[0079] A tab is soldered onto both the positive and negative electrode plates. Adhesive tape is applied to the surface of the tabs to prevent soldering burrs from causing short circuits in the cell structure.
[0080] 2. Cell body preparation
[0081] The main body of the battery cell can be a wound core formed by winding a positive electrode, a separator, and a negative electrode. Alternatively, the main body of the battery cell can also be a stacked core formed by stacking multiple positive electrode plates, multiple separators, and multiple negative electrode plates.
[0082] 3. Preparation of cell housing 10 and cell structure
[0083] An aluminum-plastic film is hot-pressed into shape in a mold according to the size of the battery cell body. The aluminum-plastic film has pits. After the aluminum-plastic film is bent to cover the pits, a receiving cavity 101 and three sealing edges 20 are formed.
[0084] The two polypropylene layers 3 of the edge seal 20 are removed using a laser device, and the removal is then inspected using a vision system. It should be noted that the vision system is equipped with a camera and a light source to capture images of the edge seal 20; the vision system is also equipped with image processing software to identify and analyze defects (such as incompletely removed polypropylene layers 3, damage to the metal layer 2, or other surface imperfections).
[0085] The battery cell body is placed in the recess of the aluminum-plastic film and sealed with edge sealing 20. Under welding pressure, the two edge sealing bodies are pressed between the upper and lower electrodes. The current flows through the metal layer 2 region and generates resistance heat, heating the metal layer 2 to a local melting state, realizing the interatomic bonding, completing the seal, and thus forming the battery cell shell 10 and the battery cell structure.
[0086] This utility model provides a battery, including a cell structure.
[0087] The battery can be a lithium-ion battery or a sodium-ion battery.
[0088] The cell structure in this embodiment is the same as the cell structure provided in any of the above embodiments, and can bring the same or similar technical effects. It will not be described in detail here. For details, please refer to the description of the above embodiments.
[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A battery cell structure, characterized in that, include; Battery cell body; The battery cell housing (10) includes a housing body (11) and a sealing edge (20). The housing body (11) is provided with a receiving cavity (101) for accommodating the battery cell body. The shell body (11) includes a first wall (111) and a second wall (112), the first wall (111) and the second wall (112) forming the receiving cavity (101), and the first wall (111) and the second wall (112) each include a polymer layer (1), a metal layer (2) and a polypropylene layer (3) stacked sequentially. The edge sealing (20) is connected to the edge of the shell body (11); The edge sealing (20) includes two edge sealing bodies (201), each edge sealing body (201) including the polymer layer (1) and the metal layer (2) stacked together, at least a portion of the metal layer (2) of the two edge sealing bodies (201) is thermally fused to form a sealing part (21), the sealing part (21) sealing the receiving cavity (101).
2. The cell structure according to claim 1, characterized in that, The sealing edge (20) is provided with a non-sealing portion (22), and the non-sealing portion (22) is provided on at least one side of the sealing portion (21) in the thickness direction of the battery cell structure.
3. The cell structure according to claim 2, characterized in that, In the direction perpendicular to the sealing edge (20), the thickness of the non-sealed portion (22) is greater than the thickness of the sealed portion (21), and the thickness of the non-sealed portion (22) is the sum of the thicknesses of the two polymer layers (1) and the two metal layers (2); and / or, The difference between the thickness of the non-sealed portion (22) and the thickness of the sealed portion (21) is 20% to 40% of the thickness of the two metal layers (2).
4. The cell structure according to claim 2, characterized in that, In the thickness direction of the cell structure, the thickness of the cell housing (10) is greater than or equal to 1.3 mm; and / or, the length of the sealing edge (20) is greater than or equal to 1.3 mm; and / or, the length of the sealing portion (21) is greater than or equal to 0.3 mm.
5. The cell structure according to any one of claims 1-4, characterized in that, The housing body (11) is provided with a bent portion (113) connected to the sealing edge (20).
6. The cell structure according to claim 5, characterized in that, The bending portion (113) includes two polymer layers (1), two metal layers (2) and two polypropylene layers (3). The two polypropylene layers (3) are in contact with each other, and the two polypropylene layers (3) are heat-fused at one end toward the sealing edge (20). The heat-fused portion of the two polypropylene layers (3) is arranged in a triangular shape.
7. The cell structure according to claim 5, characterized in that, The end of the sealing edge (20) away from the bend (113) is wrapped with a first adhesive (30), the first adhesive (30) including the end of the sealing edge (20) away from the battery cell body.
8. The cell structure according to claim 5, characterized in that, A second adhesive (40) is provided between the sealing edge (20) and the battery cell housing (10), and the second adhesive (40) bonds the housing body (11) and the sealing edge (20).
9. The cell structure according to any one of claims 1-4, characterized in that, The cell housing (10) includes a plurality of sealing edges (20), which are connected along the edge of the housing body (11) on one side of the cell structure in the thickness direction.
10. A battery, characterized in that, include: The cell structure as described in any one of claims 1-9.