Diaphragm structure, battery laminated core and laminated battery

Abstract

The utility model relates to the field of batteries, in particular to a diaphragm structure, a battery laminated core and a laminated battery. The diaphragm structure comprises stacked diaphragm layers, adjacent diaphragm layers are connected through peripheral edges to form slots with openings, and the slots comprise first slots and second slots which are alternately stacked; the negative plate is inserted into the first slot, the positive plate is inserted into the second slot, and the area of the first slot is larger than that of the second slot, so that the negative plate inserted into the first slot completely covers the positive plate inserted into the second slot. According to the diaphragm structure, the positive plate and the negative plate can be conveniently and manually inserted to form a battery laminated core, lamination equipment is not needed, meanwhile, the energy consumption of machine adjustment is reduced, the performance of the battery laminated core is conveniently verified through experiments, and the experiment cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a diaphragm structure, a battery core and a laminated battery. Background Art

[0002] Lithium batteries consist of a casing or aluminum-plastic film, a rolled or stacked core (composed of a positive and negative electrode separated by a separator), a cover, and an electrolyte. Due to their high capacity, light weight, long cycle life, high energy density, no memory effect, low self-discharge rate, and environmental friendliness, lithium batteries are highly regarded by the industry and widely used in electric vehicles, electric bicycles, and various hardware tools and electrical appliances.

[0003] Typically, batteries are constructed by wrapping the positive and negative electrodes together using a winding or zigzag lamination process to ensure the negative electrode covers the positive electrode. However, in small-scale experimental verification processes, if a laminating and winding machine is unavailable, or if experimental materials are limited, the machine setup process can be quite cumbersome, leading to significant material consumption. Utility Model Content

[0004] The present application provides a diaphragm structure, a battery core and a laminated battery. The above-mentioned diaphragm structure facilitates manual insertion of positive and negative electrode sheets to form a battery core without the aid of lamination equipment, while reducing energy consumption for machine adjustment, facilitating experiments to verify battery core performance and reducing experimental costs.

[0005] In the first aspect, the present application provides a diaphragm structure, comprising diaphragm layers arranged in a stacked manner, wherein adjacent diaphragm layers are connected by peripheral edges to form slots with openings, and the slots comprise first slots and second slots alternately stacked; the first slots are used for inserting negative electrode sheets, and the second slots are used for inserting positive electrode sheets; the area of the first slot is larger than the area of the second slot, so that the negative electrode sheet inserted in the first slot completely covers the positive electrode sheet inserted in the second slot.

[0006] In some embodiments, the diaphragm layer is rectangular, the first side, second side and bottom edge of adjacent diaphragm layers are correspondingly connected by heat-pressing bonding, and the opening is formed between the top edges of adjacent diaphragm layers; wherein the first side and the second side are respectively located on the left and right sides of the bottom edge.

[0007] In some embodiments, a length of the first slot along the direction from the first side to the second side is greater than a first dimension of the second slot.

[0008] In some embodiments, a depth of the first slot along a direction from the top edge to the bottom edge is greater than a second dimension of the second slot.

[0009] In some embodiments, the first size is twice the second size.

[0010] In some embodiments, the first slot and the second slot are arranged in a one-to-one correspondence.

[0011] In a second aspect, the present application provides a battery core, comprising a positive electrode sheet, a negative electrode sheet and any of the above-mentioned diaphragm structures, wherein the negative electrode sheet is inserted into the first slot, and the positive electrode sheet is inserted into the second slot.

[0012] In some embodiments, any of the positive electrode sheets is connected to a positive electrode tab, any of the negative electrode sheets is connected to a negative electrode tab, all of the positive electrode tabs are electrically connected, and all of the negative electrode tabs are electrically connected.

[0013] In some embodiments, the method further comprises an adhesive tape wrapped around the periphery of the diaphragm structure.

[0014] In a third aspect, the present application provides a laminated battery comprising a shell, a top cover and a battery core as described above, wherein the shell is filled with electrolyte, the battery core is arranged in the shell, and the top cover is buckled into the shell.

[0015] The above-mentioned technical solution provided by the embodiment of the present application has the following advantages compared with the prior art: the above-mentioned diaphragm structure includes stacked diaphragm layers, and adjacent diaphragm layers are connected by peripheral edge portions to form slots between adjacent diaphragm layers, and the slots specifically include a first slot and a second slot that are alternately stacked, and the area of the first slot is larger than that of the second slot; when a battery core needs to be formed, it is only necessary to manually insert the negative electrode sheet into the first slot and the positive electrode sheet into the second slot; the area of the first slot is larger than that of the second slot, so that the negative electrode sheet inserted in the first slot can completely cover or envelop the positive electrode sheet inserted in the second slot.

[0016] When forming a battery core with the above-mentioned diaphragm structure, no special equipment is required. It is only necessary to cut the positive and negative electrodes into appropriate sizes and manually plug them in. At the same time, it reduces energy consumption during the machine adjustment process, facilitates experimental verification and reduces experimental costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0020] Figure 1 A front view of the diaphragm structure provided in an embodiment of the present application;

[0021] Figure 2 for Figure 1 perspective drawing;

[0022] Figure 3 for Figure 1 Side view of

[0023] Figure 4 for Figure 1 Top view of .

[0024] Description of reference numerals:

[0025] 10-diaphragm layer; 11-first slot; 12-second slot. DETAILED DESCRIPTION

[0026] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0027] The disclosure below provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, these are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0028] For ease of description, spatially relative terms may be used herein to describe the relative position or movement of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," "above," "front," "back," and the like. Such spatially relative terms are intended to include different orientations of the device in use or operation other than the orientation depicted in the figures. For example, if the device in the figures undergoes a positional flip or a change in posture or a change in motion, then these directional indications will also change accordingly. For example, an element described as "below" or "below" another element or feature will subsequently be oriented as "above" or "above" another element or feature. Thus, the example term "below" can include both above and below orientations. The device may be oriented otherwise (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein will be interpreted accordingly.

[0029] In order to solve the technical problem in the related art that battery stacking requires the help of special stacking equipment and the test material is small, resulting in high energy consumption during the adjustment process; the present application provides a diaphragm structure, a battery core and a stacked battery, which can complete the production of battery cores without the help of special stacking equipment, avoiding the problem of high energy consumption in adjusting the stacking equipment when the test material is small, facilitating the battery core performance verification experiment and reducing the experimental cost.

[0030] The present application embodiment provides a diaphragm structure, such as Figures 1 to 4 As shown, the diaphragm structure is mainly formed by stacking multiple diaphragm layers 10 in sequence, and adjacent diaphragm layers 10 are connected by the distribution of the peripheral edges to form slots, and the slots have openings so that the positive electrode sheet or the negative electrode sheet can be inserted into the corresponding slots through the openings. Figure 3 and Figure 4 From a sectional view, the multiple slots in the diaphragm structure consist of first slots 11 and second slots 12, alternately stacked in a direction perpendicular to the diaphragm layer 10. The area of the first slots 11 is larger than that of the second slots 12. The first slots 11 are used to insert the negative electrode sheet, while the second slots 12 are used to insert the positive electrode sheet. The larger area of the first slots 11 than the second slots 12 allows the negative electrode sheet inserted in the first slots 11 to completely cover or enclose the positive electrode sheet inserted in the second slots 12, meeting the requirement of the negative electrode sheet covering the positive electrode sheet in the battery stack.

[0031] It should be noted that the negative electrode sheet completely covers or encapsulates the positive electrode sheet specifically means that the orthographic projection of the negative electrode sheet on the diaphragm layer 10 completely covers the orthographic projection of the positive electrode sheet on the diaphragm layer 10, or that the orthographic projection of the positive electrode sheet on the diaphragm layer 10 falls within the range of the orthographic projection of the negative electrode sheet on the diaphragm layer 10.

[0032] When the performance of battery stacks composed of electrode sheets of different materials or the performance of battery stacks exposed to electrolytes of different compositions or concentrations needs to be verified through experiments, that is, when the battery stack needs to be manufactured, the positive and negative electrode sheets can be cut to corresponding sizes, and then the positive electrode sheet can be manually inserted into the second slot 12 of the diaphragm structure and the negative electrode sheet can be inserted into the first slot 11. Finally, the outer periphery of the diaphragm structure can be tightly wrapped with tape to obtain the desired battery stack. This eliminates the need for dedicated stacking equipment and avoids the energy consumption of stacking equipment adjustment when the test material is small, thereby improving experimental convenience and reducing experimental costs.

[0033] In some embodiments, the separator layer 10 can be rectangular, with each separator layer 10 comprising a first side, a second side, a bottom, and a top. The first and second sides are parallel to each other and located to the left and right of the bottom and top, respectively. The bottom and top are parallel to each other. Adjacent separator layers 10 are connected by aligning their first sides and heat-pressing and bonding them, aligning their second sides and heat-pressing and bonding them, and heat-pressing and bonding their bottoms to each other, forming a slot with an opening located on the top side. By controlling the heat-pressing bonding width of the corresponding sides of different separator layers 10, first slots 11 and second slots 12 of varying sizes are formed. The first slots 11 and second slots 12 are alternately stacked, forming a one-to-one, alternating arrangement of first slot 11-second slot 12-first slot 11-second slot 12..., so that a negative electrode sheet can be inserted into the corresponding first slot 11 and a positive electrode sheet can be inserted into the corresponding second slot 12, forming a battery stack structure with a one-to-one, alternating arrangement of negative electrode sheet-positive electrode sheet-negative electrode sheet-positive electrode sheet...

[0034] See also Figure 2 , Figure 2 The solid line represents the slot edge of the first slot 11 , and the dotted line represents the slot edge of the second slot 12 .

[0035] In some embodiments, the width of the first slot 11, that is, the dimension from the first side to the second side of the diaphragm layer 10, is greater than the width of the second slot 12, and the width of the first slot 11 is greater than the first dimension a of the width of the second slot 12; at the same time, the depth of the first slot 11, that is, the dimension from the top to the bottom of the first slot 11, is greater than the depth of the second slot 12, and the depth of the first slot 11 is greater than the second dimension b of the depth of the second slot 12; in this way, the negative electrode sheet can fully cover the positive electrode sheet along the length and width directions.

[0036] For example, the first dimension a can be twice the second dimension b, that is, a=2b. In this way, the dimension of the negative electrode sheet outside the two ends of the length direction of the positive electrode sheet is b, and the dimension of the negative electrode sheet outside at least one side of the width direction of the positive electrode sheet (the side close to the bottom edge of the separator layer 10) is also b. This facilitates cutting and improves the coating effect of the negative electrode sheet on the positive electrode sheet. Of course, the dimensions of the negative electrode sheet on each side of the positive electrode sheet can also be set to different as needed.

[0037] The above-mentioned diaphragm structure can be pre-fabricated and is easy to carry and transport. When in use, the positive and negative electrode sheets can be cut into corresponding sizes, inserted into the corresponding slots, and then fixed with tape.

[0038] The manufacturing method of the diaphragm structure is as follows: Take the length of the positive electrode sheet as X and the width as Y as an example, wherein the length corresponds to the width of the slot, that is, the dimension from the first side to the second side of the diaphragm layer 10, and the width corresponds to the depth of the slot, that is, the dimension from the top to the bottom of the diaphragm layer 10. First, the diaphragm is cut into a length of X+14mm and a width of Y+14mm. The edges of the first side of the two diaphragm layers 10 are heat-pressed and bonded together by hot pressing; then the edges of the bottom are heat-pressed and bonded together; finally, the edges of the second side of the two diaphragm layers 10 are heat-pressed and bonded together. The heat-pressed bonding width of the first and second sides is 7mm, and the heat-pressed bonding width of the bottom can also be 7mm. It can be understood that 14mm and 7mm are schematic illustrations, and in actual implementation, they can be adjusted to other sizes as needed; the two adjacent diaphragm layers 10 are heat-pressed and bonded together to form a diaphragm bag structure with a second slot 12.

[0039] Then, based on the number of stacked negative electrode sheets, the first side edges, bottom edges, and second side edges of the corresponding number of diaphragm bag structures are heat-compression bonded together, forming first slots 11 between adjacent diaphragm bags. The heat-compression bond width of each edge is smaller than the heat-compression bond width of the corresponding edge of the diaphragm layer 10 forming the diaphragm bag structure. The heat-compression bond width of the side edges of adjacent diaphragm bag structures can be 5 mm, ensuring that the length and depth of the first slots 11 are both greater than the second slots 12. Finally, a layer of diaphragm layer 10 is heat-compression bonded to the outside of the last layer of diaphragm bags to form a layer of first slots 11, ensuring that the number of first slots 11 and second slots 12 is equal.

[0040] An embodiment of the present application also provides a battery core stack, including a positive electrode sheet, a negative electrode sheet and the diaphragm structure provided in the above embodiment, the size of the negative electrode sheet matches the size of the first slot 11, and the size of the positive electrode sheet matches the size of the second slot 12; the first slot 11 and the second slot 12 are alternately stacked and the number corresponds one to one, and the positive electrode sheet and the negative electrode sheet also remain the same.

[0041] In addition, the battery stack also includes positive electrode ears corresponding to the number of positive electrode sheets and negative electrode ears corresponding to the number of negative electrode sheets. Adjacent positive electrode ears are connected and fixed to each other so that all positive electrode ears are electrically connected, and adjacent negative electrode ears are connected and fixed to each other so that all negative electrode ears are electrically connected.

[0042] In order to improve the reliability of the fixation of the positive and negative electrode sheets, the battery core also includes tape wrapped around the periphery of the diaphragm structure. That is, after the positive and negative electrode sheets are plugged in, the tape is wrapped around the periphery of the diaphragm structure for further fixation.

[0043] The present application also provides a laminated battery comprising a housing, a top cover, and the battery core provided in the above-described embodiments. The housing has a cavity, the top cover snapping onto the top of the cavity, and the cavity is filled with electrolyte. The battery core is disposed within the housing cavity and immersed in the electrolyte. The top cover also includes a positive electrode post electrically connected to the positive tab of the battery core, and a negative electrode post electrically connected to the negative tab of the battery core. The structures of the housing, top cover, and other battery components can be referenced to the prior art and will not be further described in this application.

[0044] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0045] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0046] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A diaphragm structure, characterized in that: It includes stacked diaphragm layers, adjacent diaphragm layers are connected by peripheral edges to form slots with openings, and the slots include first slots and second slots that are alternately stacked; the first slots are used for inserting negative electrode sheets, and the second slots are used for inserting positive electrode sheets; the area of the first slot is larger than the area of the second slot, so that the negative electrode sheet inserted in the first slot completely covers the positive electrode sheet inserted in the second slot.

2. The diaphragm structure according to claim 1, characterized in that The diaphragm layer is rectangular, and the first side, second side and bottom sides of adjacent diaphragm layers are correspondingly connected by heat-pressing bonding, and the opening is formed between the top sides of adjacent diaphragm layers; wherein the first side and the second side are respectively located on the left and right sides of the bottom side.

3. The diaphragm structure according to claim 2, characterized in that: A length of the first slot along a direction from the first side to the second side is greater than a first dimension of the second slot.

4. The diaphragm structure according to claim 3, characterized in that The depth of the first slot along the direction from the top edge to the bottom edge is greater than the second dimension of the second slot.

5. The diaphragm structure according to claim 4, characterized in that: The first size is twice the second size.

6. The diaphragm structure according to any one of claims 1 to 5, characterized in that: The first slots and the second slots are arranged in a one-to-one correspondence.

7. A battery stack, characterized in that: It comprises a positive electrode sheet, a negative electrode sheet and the diaphragm structure according to any one of claims 1 to 6, wherein the negative electrode sheet is inserted into the first slot, and the positive electrode sheet is inserted into the second slot.

8. The battery stack according to claim 7, characterized in that: Any of the positive electrode sheets is connected to a positive electrode tab, any of the negative electrode sheets is connected to a negative electrode tab, all of the positive electrode tabs are electrically connected, and all of the negative electrode tabs are electrically connected.

9. The battery stack according to claim 7, characterized in that: Also included is an adhesive tape wrapped around the outer periphery of the diaphragm structure.

10. A laminated battery, characterized in that: The battery cell comprises a shell, a top cover and the battery core according to any one of claims 7 to 9, wherein the shell is filled with electrolyte, the battery core is arranged in the shell, and the top cover is buckled with the shell.

Images