Soft package battery cell and battery pack

Abstract

The utility model provides a soft package battery cell and battery pack, the soft package battery cell comprises a packaging film shell with a mounting cavity and a pole group arranged in the mounting cavity, a pole lug of the pole group extends out of the mounting cavity, the pole group comprises a pole group body with the pole lug and a protection plate arranged on at least one side of the width direction of the pole group body, and the protection plate extends along the length direction of the pole group body. According to the soft package battery cell disclosed by the utility model, the protection plate is arranged on at least one side of the pole group body in the width direction, and the protection plate extends along the length direction of the pole group body, so that the side part of the pole group body can be protected, damage such as collision and dents on the side part can be prevented, and the performance of the soft package battery cell can be improved; and the protection plate is simple in structure and convenient to arrange and implement.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, in particular to a soft-pack battery cell; at the same time, the utility model also relates to a battery pack provided with the soft-pack battery cell. Background Art

[0002] Soft-pack battery cells have been widely used in fields such as electric vehicles and energy storage systems due to their unique aluminum-plastic film packaging method and flexible design capabilities. With the continuous development of the new energy industry, the production process and performance of soft-pack battery cells are also constantly optimized and improved.

[0003] Currently, the commonly used soft-pack battery cells mainly place the electrode assembly in the aluminum-plastic film after punching. The soft-pack battery cells adopt thermal packaging technology, and the aluminum-plastic film is melted and bonded together by heating to complete the packaging of the battery cell. Since the aluminum-plastic film is relatively soft, it is easy to cause damage such as bumps and dents at the edge of the electrode assembly when protecting the electrode assembly, thereby affecting the use performance of the soft-pack battery cell. Summary of the Utility Model

[0004] In view of this, the utility model aims to propose a soft-pack battery cell to prevent damage at the edge of the electrode assembly.

[0005] To achieve the above object, the technical solution of the utility model is realized as follows:

[0006] A soft-pack battery cell includes a packaging film housing having an installation cavity, and an electrode assembly disposed in the installation cavity. The tab of the electrode assembly extends out of the installation cavity. The electrode assembly includes an electrode assembly body having the tab, and a protection plate disposed on at least one side in the width direction of the electrode assembly body, and the protection plate extends along the length direction of the electrode assembly body.

[0007] Further, a plurality of ventilation holes are provided on the protection plate.

[0008] Further, the ratio between the total area of the ventilation holes and the area of the protection plate is between 0.1 and 0.6.

[0009] Further, the ventilation holes are any one of circular, elliptical, polygonal or irregular in shape.

[0010] Further, the thickness of the protection plate is between 0.5 mm and 1 mm.

[0011] Further, the ratio between the width of the protection plate and the thickness of the electrode assembly body is between 0.8 and 1.

[0012] Further, rounded corners are respectively provided at the joints of two adjacent outer side surfaces of the protection plate.

[0013] Further, the protective plate and the main body of the electrode group are adhesively connected.

[0014] Further, the protective plate is made of PET material or PP material.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] For the soft-pack battery cell of the utility model, by arranging a protective plate on at least one side in the width direction of the main body of the electrode group, and the protective plate extends along the length direction of the main body of the electrode group, the side part of the main body of the electrode group can be protected, thereby preventing damages such as bumps and dents on the side part, and further being beneficial to improving the performance of the soft-pack battery cell. Moreover, the structure of the protective plate is simple and convenient for layout and implementation.

[0017] In addition, by arranging ventilation holes on the protective plate, it is beneficial to prevent abnormal problems of the battery cell caused by poor exhaust during pre-charging of the soft-pack battery cell, thereby being beneficial to ensuring the pre-charging effect of the soft-pack battery cell. The setting of the total area ratio of the ventilation holes can ensure the pre-charging exhaust effect on the premise of meeting the strength requirement of the protective plate, prevent the strength of the protective plate from being reduced due to the too large total area of the ventilation holes, and prevent the exhaust effect during pre-charging from being affected due to the too small area of the ventilation holes. The ventilation holes being any one of circular, oval, polygonal or irregular in shape has the advantage of being easy to process and form.

[0018] In addition, the setting of the thickness range of the protective plate is beneficial to the lightweight design of the soft-pack battery cell on the premise of meeting the protection requirement. When the thickness of the protective plate is less than 0.5 mm, the protective plate is relatively thin and has low strength, and the protection effect on the main body of the electrode group is poor. When the thickness of the protective plate is greater than 1 mm, although the protection strength is high, it will cause a large occupation of the space in the installation cavity by the protective plate, which is not conducive to the capacitance of the soft-pack battery cell, and at the same time will also cause an increase in the weight of the soft-pack battery cell, thus being not conducive to the lightweight design of the soft-pack battery cell. The setting of the ratio range of the width of the protective plate to the thickness of the electrode group is not only beneficial to ensuring the protection effect of the protective plate, but also convenient for the layout of the electrode group in the packaging film shell. By arranging rounded corners at the connection of the two adjacent outer sides of the protective plate, it is beneficial to avoid damage to the packaging film shell when the right-angle structure at the connection is collided. The protective plate is adhesively connected to the main body of the electrode group, which has the advantage of being easy to arrange and implement. The protective plate is made of PET material or PP material, so that the protective plate has better hardness, and further is beneficial to ensuring the protection effect on the main body of the electrode group.

[0019] In addition, another object of the utility model is to propose a battery pack, including the soft-pack battery cell as described above.

[0020] The battery pack of the utility model is beneficial to improving the safety of the battery pack by arranging the soft-pack battery cell as above. Description of the Drawings

[0021] The accompanying drawings, which form a part of the present utility model, are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0022] Figure 1 is the disassembly diagram of the soft-pack battery cell described in the embodiment of the present utility model;

[0023] Figure 2 is the structural schematic diagram of the electrode group described in the embodiment of the present utility model;

[0024] Figure 3 is the structural schematic diagram of the protection plate described in the embodiment of the present utility model.

[0025] Explanation of reference numerals:

[0026] 1. Packaging film housing; 2. Electrode group;

[0027] 100. Installation groove; 101. Upper housing; 102. Lower housing;

[0028] 201. Electrode group body; 2011. Tab; 202. Protection plate; 2021. Vent hole; 2022. First side; 2023. Second side; 2024. Rounded corner. Detailed implementation manners

[0029] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments may be combined with each other.

[0030] In the description of the present utility model, it should be noted that if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "back", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, if terms such as "first", "second", etc. appear, they are also only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0031] The present utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0032] This embodiment relates to a soft-pack battery cell to solve the problem that the electrode group 2 in the prior art is prone to damage, resulting in poor use effect of the soft-pack battery cell.

[0033] In terms of the overall structure, the soft-pack battery cell includes a packaging film shell 1 having an installation cavity, and a pole group 2 disposed in the installation cavity. The pole tabs 2011 of the pole group 2 extend out of the installation cavity. The pole group 2 includes a pole group body 201 having pole tabs 2011, and a protective plate 202 disposed on at least one side in the width direction of the pole group body 201, and the protective plate 202 extends along the length direction of the pole group body 201.

[0034] For the soft-pack battery cell described in this embodiment, by providing the protective plate 202 on at least one side in the width direction of the pole group body 201, and the protective plate 202 extends along the length direction of the pole group body 201, the side portion of the pole group body 201 can be protected, thereby preventing damages such as bumps and dents on the side portion, and further facilitating the improvement of the performance of the soft-pack battery cell. Moreover, the structure of the protective plate 202 is simple and convenient for arrangement and implementation.

[0035] Based on the above overall introduction, an exemplary structure of the soft-pack battery cell described in this embodiment is as Figure 1 shown in, and an exemplary structure of the pole group 2 is as Figure 2 shown in. Among them, the packaging film shell 1 includes an upper shell 101 and a lower shell 102 that are buckled and connected up and down. Both the upper shell 101 and the lower shell 102 have installation grooves 100. The pole group body 201 is disposed between the upper shell 101 and the lower shell 102 and is heat-sealed together with the edges of both the upper shell 101 and the lower shell 102, so that the two installation grooves 100 form the above-mentioned installation cavity, and the pole group 2 is located in the installation cavity. The material of the packaging film shell 1 can refer to the prior art. For example, an aluminum-plastic material can be used, which will not be elaborated here.

[0036] The pole group body 201 includes a plurality of positive electrode plates and a plurality of negative electrode plates that are alternately stacked together, and a separator disposed between adjacent positive electrode plates and negative electrode plates. Among them, the positive pole tabs 2011 and the negative pole tabs 2011 on the pole group body 201 can be located at the same end, or can be respectively disposed at both ends of the pole group body 201, and can be determined according to requirements during specific implementation.

[0037] As a preferred implementation manner, protective plates 202 are provided on both sides in the width direction of the pole group body 201, and the length of the protective plate 202 is the same as the length of the pole group 2, which is beneficial to further improving the protection effect on the pole group body 201. In addition, as shown in the figure, in this embodiment, a plurality of ventilation holes 2021 are provided on the protective plate 202. By providing the ventilation holes 2021, it is beneficial to prevent abnormal problems of the battery cell caused by poor exhaust during pre-charging of the soft-pack battery cell, thereby facilitating the ensuring of the pre-charging effect of the soft-pack battery cell.

[0038] Among them, the ventilation holes 2021 in this embodiment are multiple and are arranged at intervals on the protection plate 202. The multiple protection holes are arranged at intervals along the length direction and the width direction of the protection plate 202 to further improve the coverage area and exhaust efficiency of the ventilation holes 2021. During specific implementation, the ventilation holes 2021 can be Figure 3 circular as shown in, or can be in the shape of an ellipse, polygon, special shape, etc. that are easy to process and form. The polygon can be, for example, a square, a triangle, a pentagon, etc. In addition, the shapes of the multiple ventilation holes 2021 can be the same or different, and can be determined according to requirements during specific implementation.

[0039] As a preferred implementation manner, the ratio between the total area of the ventilation holes 2021 and the area of the protection plate 202 is between 0.1 and 0.6. That is, the ratio between the total ventilation area of the multiple ventilation holes 2021 on each protection plate 202 and the area of the protection plate 202 is between 0.1 and 0.6. Such a setting can ensure the pre-charging and exhaust effect on the premise of meeting the strength requirements of the protection plate 202, prevent the strength of the protection plate 202 from being reduced due to the too large total area of the ventilation holes 2021, and prevent the exhaust effect during pre-charging from being affected due to the too small area of the ventilation holes 2021. During specific implementation, the ratio between the total area of the ventilation holes 2021 and the area of the protection plate 202 can be, for example, 0.1, 0.2, 0.3, 0.4, 0.5, or 0.6, etc.

[0040] In addition, in this embodiment, the ratio between the width of the protection plate 202 and the thickness of the electrode group body 201 is between 0.8 and 1. Such a setting not only helps to ensure the protection effect of the protection plate 202, but also facilitates the arrangement of the electrode group 2 in the packaging film housing 1. During specific implementation, the ratio between the width of the protection plate 202 and the thickness of the electrode group body 201 can be, for example, 0.8, 0.85, 0.9, 0.95, or 1, etc.

[0041] Among them, when the ratio between the width of the protection plate 202 and the thickness of the electrode group body 201 is less than 0.8, the protection area of the protection plate 202 on the side of the electrode group body 201 is small at this time, so the protection effect is poor. When the ratio between the width of the protection plate 202 and the thickness of the electrode group body 201 is greater than 1, it will cause the protection plate 202 to be higher than the electrode group body 201, which is not only not conducive to the arrangement of the electrode group 2 in the installation cavity, but also results in low utilization rate of the space in the installation cavity.

[0042] To further improve the protection effect of the protection plate 202, in this embodiment, rounded corners 2024 are respectively provided at the joints of two adjacent outer sides of the protection plate 202. This is beneficial to avoid damage to the packaging film housing 1 when the right-angle structure at the joint is collided. Specifically, the protection plate 202 has a first side 2022 disposed opposite to the electrode group body 201, and four second sides 2023 provided on the outer periphery of the protection plate 202 body and respectively connected to the four sides of the first side 2022. The above-mentioned rounded corners 2024 are specifically provided at the joints of the first side 2022 and each second side 2023. Of course, rounded corners 2024 can also be provided at the joints of two adjacent second sides 2023.

[0043] The protection plate 202 in this embodiment is made of PET material or PP material, so that the protection plate 202 has good hardness, which is beneficial to ensuring the protection effect on the electrode group body 201. Among them, PET (abbreviation for polyethylene terephthalate) material has high strength and toughness, and excellent anti-tensile and anti-impact properties. Therefore, the protection plate 202 has good durability and reliability. In addition, PET has good wear resistance and can maintain its stable performance in a variety of usage scenarios. PP (abbreviation for polypropylene) material is one of the plastics with relatively low density, which gives the protection plate 202 an advantage in weight and is convenient for transportation and handling. At the same time, it also makes the protection plate 202 have high strength and good rigidity. The PP material has excellent resistance to a variety of chemical drugs and corrosive media, making the protection plate 202 not easily eroded and damaged.

[0044] As a preferred connection method, in this embodiment, the protection plate 202 and the electrode group body 201 are adhesively connected. For example, the protection plate 202 is adhesively adjacent to the side of the electrode group body 201 through double-sided tape, which has the advantages of easy layout and high connection strength.

[0045] As a feasible implementation method, in this embodiment, the thickness of the protection plate 202 is between 0.5 - 1 mm. With such a setting, on the premise of meeting the protection requirements, it is beneficial to the lightweight design of the soft-pack battery cell. Among them, when the thickness of the protection plate 202 is less than 0.5 mm, the protection plate 202 is relatively thin and has low strength, resulting in poor protection effect on the electrode group body 201. When the thickness of the protection plate 202 is greater than 1 mm, although the protection strength is high, it will cause the protection plate 202 to occupy a large amount of space in the installation cavity, which is not conducive to the capacitance of the soft-pack battery cell, and at the same time will also cause an increase in the weight of the soft-pack battery cell, thus being not conducive to the lightweight design of the soft-pack battery cell.

[0046] The soft-pack battery cell described in this embodiment is provided with a protective plate 202 on the side of the electrode group body 201, which is beneficial to prevent losses such as bumps or pits on the electrode group body 201. By providing ventilation holes 2021 on the protective plate 202, it is beneficial to exhaust gas during the pre-charging process of the soft-pack battery cell. It not only has a simple structure, is easy to arrange and implement, but also has a good protection effect, which is beneficial to improving the safety of the soft-pack battery cell.

[0047] In addition, this embodiment also relates to a battery pack, which includes the soft-pack battery cell described above. By providing the soft-pack battery cell as described above, the safety of the battery pack is improved in this embodiment.

[0048] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A soft-pack battery cell, characterized in that: It includes a packaging film shell having an installation cavity, and a pole group disposed in the installation cavity. The pole tabs of the pole group extend out of the installation cavity. The pole group includes a pole group body having the pole tabs, and a protection plate disposed on at least one side in the width direction of the pole group body, and the protection plate extends along the length direction of the pole group body.

2. The soft-pack battery cell according to claim 1, characterized in that: A plurality of ventilation holes are provided on the protection plate.

3. The soft-pack battery cell according to claim 2, characterized in that: The ratio between the total area of the ventilation holes and the area of the protection plate is between 0.1 and 0.

6.

4. The soft-pack battery cell according to claim 2, characterized in that: The ventilation holes are any one of circular, oval, polygonal or irregular in shape.

5. The soft-pack battery cell according to claim 1, characterized in that: The thickness of the protection plate is between 0.5 mm and 1 mm.

6. The soft-pack battery cell according to claim 1, characterized in that: The ratio between the width of the protection plate and the thickness of the pole group body is between 0.8 and 1.

7. The soft-pack battery cell according to claim 1, characterized in that: Round corners are respectively provided at the joints of the adjacent outer sides of the protection plate.

8. The soft-pack battery cell according to claim 1, characterized in that: The protection plate and the pole group body are adhesively connected.

9. The soft-pack battery cell according to any one of claims 1 to 8, characterized in that: The protection plate is made of PET material or PP material.

10. A battery pack, characterized in that: It includes the soft-pack battery cell according to any one of claims 1 to 9.

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