Laminated battery core package, laminated battery structure and power utilization device

Abstract

The utility model relates to the technical field of batteries, and discloses a laminated battery core package, a laminated battery structure and an electric device, which comprise a positive plate, a negative plate and a diaphragm, the positive plate comprises a positive foil and a positive coating, the positive foil is provided with a first notch, a first empty foil area and a first dressing area, the first dressing area is provided with the positive coating, and the first empty foil area is divided into a first blank area and a first fitting area; the negative plate comprises a negative foil and a negative coating, the negative foil is provided with a second notch, a second empty foil area and a second dressing area, the second dressing area is provided with the negative coating, and the second empty foil area is divided into a second blank area and a second fitting area; the diaphragm is provided with a non-fitting area and a third fitting area, the fitting area is connected with the first fitting area and the second fitting area, and the first blank area, the third fitting area and the second blank area are staggered from one another. According to the utility model, the dislocation phenomenon between the core cladding layers can be solved, and the influence on the battery capacity and the damage to the battery can be avoided.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a stacked battery cell pack, a stacked battery structure, and an electrical device. Background Technology

[0002] Pouch batteries, as a new type of lithium battery, feature a lighter and thinner design, making them suitable for applications requiring high energy density and limited space, such as consumer electronics, power tools, and electric vehicles. Unlike traditional cylindrical or prismatic batteries, pouch batteries use flexible packaging materials as their outer shell, typically an aluminum-plastic composite film, which is heat-sealed to seal the internal core. The core of a pouch battery is generally composed of multiple electrode sheets (positive and negative electrodes) and a separator, stacked together to form a single battery unit. Due to the different structure of pouch batteries compared to other battery types, their manufacturing process requires greater precision. During the stacking process, precise alignment of the electrode layers, separator, and other materials must be ensured to avoid any misalignment or gaps between layers, thereby guaranteeing battery performance and safety.

[0003] The conventional manufacturing process for stacked batteries involves dividing coated positive and negative electrode sheets into specific sizes, and then stacking the positive electrode sheet, separator, negative electrode sheet, and separator in sequence on a specific fixture. The separator has an adhesive coating on both sides, and multiple electrode sheets are bonded together by hot pressing. However, the high-temperature pressing process can cause some damage to the electrode sheets. Another example is to set an adhesive insulating coating between the coated area and the empty foil area of ​​the positive electrode sheet to solve the problem of electrode "displacement". However, the setting of the adhesive insulating coating is equivalent to reducing the area of ​​the coated area, which reduces the battery capacity to some extent. Utility Model Content

[0004] The purpose of this utility model embodiment is to provide a stacked battery cell pack, a stacked battery structure and an electrical device, which can solve the problem of misalignment between cell pack layers and avoid affecting battery capacity and damaging the battery.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A stacked battery cell pack is provided, comprising a plurality of positive electrode sheets, a plurality of negative electrode sheets, and a plurality of separators; the positive electrode sheets and the negative electrode sheets are stacked alternately along the thickness direction, and the separators are located between adjacent positive electrode sheets and negative electrode sheets;

[0007] The positive electrode sheet includes a positive electrode foil and a positive electrode coating. The positive electrode foil has a first notch, a first empty foil area, and a first coating area. The first coating area is provided with the positive electrode coating. The first notch and the first empty foil area are located on one side of the first coating area along its length direction. The first empty foil area is divided into a first blank area and a first bonding area along the width direction of the positive electrode foil. The first bonding area is located between the first notch and the first blank area.

[0008] The negative electrode sheet includes a negative electrode foil and a negative electrode coating. The negative electrode foil has a second notch, a second empty foil area, and a second coating area. The second coating area is provided with a negative electrode coating. The second notch and the second empty foil area are located on one side of the second coating area along its length direction. The second empty foil area is divided into a second blank area and a second bonding area along the width direction of the negative electrode foil. The second bonding area is located between the second notch and the second blank area.

[0009] The diaphragm has a non-adhesive area and a third adhesive area on both sides along its thickness direction. The third adhesive area is located on one side of the non-adhesive area along its length direction. The adhesive area is connected to the first adhesive area and the second adhesive area. The first blank area, the third adhesive area and the second blank area are staggered from each other.

[0010] As a further embodiment of the stacked battery cell pack, the first bonding area and the second bonding area are respectively bonded to the third bonding area on both sides of the separator by adhesive.

[0011] As a further embodiment of the stacked battery cell pack, the adhesive is a solid adhesive.

[0012] As a further embodiment of the stacked battery cell pack, the adhesive is a liquid adhesive.

[0013] As a further embodiment of the stacked battery cell pack, the first bonding area and the second bonding area are respectively heat-pressed and bonded to the third bonding area on both sides of the separator.

[0014] As a further embodiment of the stacked battery cell pack, the first bonding area is located at the center of the positive electrode sheet along its width direction, the second bonding area is located at the center of the negative electrode sheet along its width direction, and the third bonding area is located at the center of the separator along its width direction.

[0015] As a further embodiment of the stacked battery cell pack, the third bonding area is directly opposite the first bonding area and the second bonding area, and the third bonding area, the first bonding area and the second bonding area have the same size.

[0016] As a further embodiment of the stacked battery cell pack, the first notch, the first blank area, the second notch, and the second blank area have the same dimensions.

[0017] On the other hand, a stacked battery structure is provided, including an aluminum-plastic film shell, a positive electrode tab, a negative electrode tab, and the stacked battery cell pack, wherein the stacked battery cell pack is encapsulated in the aluminum-plastic film shell, the positive electrode tab passes through the aluminum-plastic film shell and is connected to the first blank area, and the negative electrode tab passes through the aluminum-plastic film shell and is connected to the second blank area.

[0018] On the other hand, an electrical device is provided, which is equipped with the aforementioned stacked battery structure.

[0019] Beneficial effects:

[0020] In this invention, the first bonding area of ​​the positive electrode sheet is connected to the third bonding area on one side of the separator, and the second bonding area of ​​the negative electrode sheet is connected to the third bonding area on the other side of the separator. This fixes the separator between the positive and negative electrode sheets, preventing any interlayer misalignment or gaps that could cause contact between the positive and negative electrode sheets, thus ensuring battery performance and safety. Compared with existing technologies, since the first bonding area is a portion of the first empty foil area, it does not occupy the coating area of ​​the positive electrode coating. Similarly, since the second bonding area is a portion of the second empty foil area, it does not occupy the coating area of ​​the negative electrode coating. This ensures insulation between the positive and negative electrode sheets while preventing the battery capacity from being affected. Furthermore, since the first and second bonding areas are empty foil areas, the connection between them and the third bonding area prevents damage to the electrode sheets caused by thermal pressure.

[0021] This invention uses liquid adhesive to bond the third bonding area with the first and second bonding areas. The adhesive force of the liquid adhesive can increase the mechanical strength of the battery and prevent deformation or damage due to internal pressure changes during charging and discharging. The use of liquid adhesive can also play a certain role in electrical isolation, reducing the risk of contact and short circuit between different electrode layers inside the battery and increasing the safety performance of the battery. The presence of liquid adhesive inside the core pack can also play a certain role in heat conduction. Attached Figure Description

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0023] Figure 1 This is a schematic diagram of the stacked battery cell pack described in Embodiment 1 of this utility model.

[0024] In the picture:

[0025] 100. Positive electrode sheet; 110. Positive electrode coating; 120. First notch; 130. First empty foil area; 131. First blank area; 132. First bonding area;

[0026] 200, Negative electrode sheet; 210, Negative electrode coating; 220, Second notch; 230, Second empty foil area; 231, Second blank area; 232, Second bonding area;

[0027] 300, diaphragm; 310, non-adhesive area; 320, third adhesive area; 330, third gap. Detailed Implementation

[0028] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and 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.

[0029] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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 or an electrical connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationships shown in the accompanying drawings. They are used solely for ease of description and simplification of operation, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are merely used for distinction in description and have no special meaning.

[0032] Example 1

[0033] like Figure 1 As shown, the stacked battery pack of this embodiment includes a plurality of positive electrode sheets 100, a plurality of negative electrode sheets 200, and a plurality of separators 300; along the thickness direction, the positive electrode sheets 100 and negative electrode sheets 200 are stacked alternately, and the separators 300 are located between adjacent positive electrode sheets 100 and negative electrode sheets 200; the positive electrode sheet 100 includes a positive electrode foil and a positive electrode coating 110, the positive electrode foil has a first notch 120, a first empty foil area 130, and a first coating area, the first coating area is provided with the positive electrode coating 110, the first notch 120 and the first empty foil area 130 are located on one side of the first coating area along its length direction (Y direction in the figure), the first empty foil area 130 is divided into a first blank area 131 and a first bonding area 132 along the width direction of the positive electrode foil (X direction in the figure), the first bonding area 132 is located between the first notch 120 and the first blank area 131; the negative electrode sheet 200... The diaphragm 300 includes a negative electrode foil and a negative electrode coating 210. The negative electrode foil has a second notch 220, a second empty foil area 230, and a second dressing area. The second dressing area is provided with the negative electrode coating 210. The second notch 220 and the second empty foil area 230 are located on one side of the second dressing area along its length direction. The second empty foil area 230 is divided into a second blank area 231 and a second bonding area 232 along the width direction of the negative electrode foil. The second bonding area 232 is located between the second notch 220 and the second blank area 231. The diaphragm 300 has a non-bonding area 310 and a third bonding area 320 on both sides along its thickness direction. The third bonding area 320 is located on one side of the non-bonding area 310 along its length direction. The bonding area is connected to the first bonding area 132 and the second bonding area 232. The first blank area 131, the third bonding area 320, and the second blank area 231 are staggered.

[0034] It is understandable that the first bonding area 132 of the positive electrode 100 is connected to the third bonding area 320 on one side of the separator 300, and the second bonding area 232 of the negative electrode 200 is connected to the third bonding area 320 on the other side of the separator 300. This fixes the separator 300 between the positive electrode 100 and the negative electrode 200, avoiding any interlayer misalignment or gaps that could cause the positive electrode 100 and the negative electrode 200 to come into contact, thus ensuring the performance and safety of the battery. Compared with the prior art, since the first bonding area 132 is a part of the first empty foil area 130, the first bonding area 132 will not occupy the coating area of ​​the positive electrode coating 110. The second bonding area 232 is a part of the second empty foil area 230, and the second bonding area 232 will not occupy the coating area of ​​the negative electrode coating 210. While ensuring the insulation effect between the positive electrode sheet 100 and the negative electrode sheet 200, the capacity of the battery can be avoided. Moreover, since the first bonding area 132 and the second bonding area 232 are empty foil areas, when the first bonding area 132 and the second bonding area 232 are connected to the third bonding area 320, there will be no damage to the electrode sheet caused by thermal pressure.

[0035] In this embodiment, the diaphragm 300 has two third notches 330, which are located on both sides of the third bonding area 320 along the X direction. One of the third notches 330 is directly opposite the first notch 120 and the second blank area 231, and the other third notch 330 is directly opposite the second notch 220 and the first blank area 131.

[0036] Furthermore, the first bonding area 132 and the second bonding area 232 are respectively bonded to the third bonding areas 320 on both sides of the separator 300 by adhesive. By bonding the first bonding area 132 to the third bonding area 320 on one side of the separator 300 and bonding the second bonding area 232 to the third bonding area 320 on the other side of the separator 300 by adhesive, a stable connection is achieved between the separator 300 and the positive electrode 100 and the negative electrode 200, preventing displacement and delamination of the stacked battery cell pack during use and ensuring the stability of the cell pack structure.

[0037] Optionally, the adhesive is a solid adhesive, which can achieve bonding between the third bonding area 320 and the first bonding area 132 and the second bonding area 232.

[0038] Preferably, the adhesive is a liquid adhesive (commonly known as glue). When using liquid adhesive, apply it to the center area of ​​the corresponding bonding area to avoid spilling it into adjacent blank areas.

[0039] This embodiment uses liquid adhesive for bonding. The adhesive force of the liquid adhesive can increase the mechanical strength of the battery and prevent deformation or damage due to changes in internal pressure during charging and discharging. Using liquid adhesive for bonding can also play a certain role in electrical isolation, reducing the risk of contact and short circuit between different electrode layers inside the battery and increasing the safety performance of the battery. The presence of liquid adhesive inside the core pack can also play a certain role in heat conduction.

[0040] Preferably, the liquid adhesive is selected from any one of epoxy resin adhesive, polyurethane adhesive, and acrylic adhesive. These liquid adhesives have a certain degree of weather resistance and can resist the effects of external environmental factors such as moisture and oxidation during long-term battery use.

[0041] The liquid adhesive used in this embodiment has excellent bonding performance and can maintain bonding stability under different environmental conditions.

[0042] Furthermore, the first bonding area 132 is located at the center of the positive electrode 100 along its width direction, the second bonding area 232 is located at the center of the negative electrode 200 along its width direction, and the third bonding area 320 is located at the center of the separator 300 along its width direction.

[0043] In this design, the first bonding area 132 is located at the center of the positive electrode 100 along its width direction (X direction in the diagram), meaning that the central symmetry line of the positive electrode 100 overlaps with the central symmetry line of the first bonding area 132 along the X direction. Similarly, the second bonding area 232 is located at the center of the negative electrode 200 along its width direction, meaning that the central symmetry line of the negative electrode 200 overlaps with the central symmetry line of the second bonding area 232 along the X direction. Finally, the third bonding area 320 is located at the center of the separator 300 along its width direction, meaning that the central symmetry line of the separator 300 overlaps with the central symmetry line of the third bonding area 320 along the X direction. This structural design facilitates interlayer alignment and improves the convenience of stacking operations.

[0044] Furthermore, the third bonding area 320 is directly opposite the first bonding area 132 and the second bonding area 232, and the dimensions of the third bonding area 320, the first bonding area 132 and the second bonding area 232 are the same, so as to facilitate interlayer alignment and improve the stability of the core package structure.

[0045] Furthermore, the dimensions of the first notch 120, the first blank area 131, the second notch 220, and the second blank area 231 are the same. During the stacking operation, simply align the first notch 120 with the second blank area 231 and the second notch 220 with the first blank area 131, which is convenient for operation.

[0046] Of course, in other embodiments, the dimensions of the notch, blank area, and bonding area can also be adjusted according to the size of the electrode sheet, which will not be elaborated further.

[0047] This embodiment also provides a stacked battery structure, including an aluminum-plastic film shell, a positive electrode tab, a negative electrode tab, and a stacked battery core pack. The stacked battery core pack is encapsulated in the aluminum-plastic film shell. The positive electrode tab passes through the aluminum-plastic film shell and is connected to the first blank area 131, and the negative electrode tab passes through the aluminum-plastic film shell and is connected to the second blank area 231.

[0048] The stacked battery pack in this embodiment has high mechanical strength, stable structure, and high safety performance.

[0049] This embodiment also provides an electrical device, characterized in that it is equipped with the stacked battery structure of the above embodiment.

[0050] Example 2

[0051] The stacked battery pack in this embodiment is basically the same as that in Embodiment 1 (refer to the attached drawings of Embodiment 1), except that the first bonding area 132 and the second bonding area 232 are respectively hot-pressed and bonded to the third bonding area 320 on both sides of the separator 300. The corresponding hot-pressed areas are only the first bonding area 132, the second bonding area 232 and the third bonding area 320, and do not involve the positive electrode coating 110 of the positive electrode sheet 100 and the negative electrode coating 210 of the negative electrode sheet 200. Therefore, it will not damage the positive electrode sheet 100 and the negative electrode sheet 200.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application 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. These 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 application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A stacked battery cell pack, characterized in that, It includes several positive electrode plates, several negative electrode plates, and several separators; along the thickness direction, the positive electrode plates and the negative electrode plates are stacked alternately, and the separators are located between adjacent positive electrode plates and negative electrode plates; The positive electrode sheet includes a positive electrode foil and a positive electrode coating. The positive electrode foil has a first notch, a first empty foil area, and a first coating area. The first coating area is provided with the positive electrode coating. The first notch and the first empty foil area are located on one side of the first coating area along its length direction. The first empty foil area is divided into a first blank area and a first bonding area along the width direction of the positive electrode foil. The first bonding area is located between the first notch and the first blank area. The negative electrode sheet includes a negative electrode foil and a negative electrode coating. The negative electrode foil has a second notch, a second empty foil area, and a second coating area. The second coating area is provided with a negative electrode coating. The second notch and the second empty foil area are located on one side of the second coating area along its length direction. The second empty foil area is divided into a second blank area and a second bonding area along the width direction of the negative electrode foil. The second bonding area is located between the second notch and the second blank area. The diaphragm has a non-adhesive area and a third adhesive area on both sides along its thickness direction. The third adhesive area is located on one side of the non-adhesive area along its length direction. The adhesive area is connected to the first adhesive area and the second adhesive area. The first blank area, the third adhesive area and the second blank area are staggered from each other.

2. The stacked battery cell pack according to claim 1, characterized in that, The first bonding area and the second bonding area are respectively bonded to the third bonding area on both sides of the diaphragm by adhesive.

3. The stacked battery cell pack according to claim 2, characterized in that, The adhesive is a solid adhesive.

4. The stacked battery cell pack according to claim 2, characterized in that, The adhesive is a liquid adhesive.

5. The stacked battery cell pack according to claim 1, characterized in that, The first bonding area and the second bonding area are respectively heat-pressed and bonded to the third bonding area on both sides of the diaphragm.

6. The stacked battery cell pack according to any one of claims 1 to 5, characterized in that, The first bonding area is located at the center of the positive electrode sheet along its width direction, the second bonding area is located at the center of the negative electrode sheet along its width direction, and the third bonding area is located at the center of the separator along its width direction.

7. The stacked battery cell pack according to any one of claims 1 to 5, characterized in that, The third bonding area is directly opposite the first bonding area and the second bonding area, and the third bonding area, the first bonding area and the second bonding area have the same size.

8. The stacked battery cell pack according to any one of claims 1 to 5, characterized in that, The dimensions of the first gap, the first blank area, the second gap, and the second blank area are the same.

9. A stacked battery structure, characterized in that, The battery pack includes an aluminum-plastic film housing, a positive electrode tab, a negative electrode tab, and a stacked battery cell pack as described in any one of claims 1 to 8. The stacked battery cell pack is encapsulated within the aluminum-plastic film housing. The positive electrode tab passes through the aluminum-plastic film housing and is connected to the first blank area. The negative electrode tab passes through the aluminum-plastic film housing and is connected to the second blank area.

10. An electrical appliance, characterized in that, It is equipped with the stacked battery structure as described in claim 9.

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