Soft package battery

Abstract

The utility model provides a soft package battery. The soft package battery comprises a shell and a pole group arranged in the shell, the shell comprises a shell body and a supporting frame arranged on the shell body. The shell body is provided with a first part located at the bottom and second parts which are arranged on the two opposite sides of the first part and bent upwards. The supporting frame is arranged on the first part and can support the second parts on the two sides, and the supporting frame and the second parts on the two sides define a containing space for containing the pole group. According to the soft package battery disclosed by the utility model, the support frame is arranged on the shell body to support the second parts, and the accommodating space for accommodating the pole group is defined by the support frame and the second parts on the two sides, so that the shell body does not need to be punched in a production process, and the manufacturing of the soft package battery with larger capacity is facilitated; and the supporting frame can protect the bottom of the soft package battery, so that the problems that the bottom of the soft package battery is deformed due to external force and the pole group is damaged are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium ion batteries, in particular to a soft-pack battery. Background Art

[0002] Compared with cylindrical lithium batteries and square lithium batteries with aluminum or steel shells, soft-pack lithium batteries are 40% lighter than steel-shell lithium batteries of the same capacity and 20% lighter than aluminum-shell lithium batteries. The capacity of soft-pack batteries is 10%-15% higher than steel-shell batteries of the same specifications and 5%-10% higher than aluminum-shell batteries. Aluminum-plastic film is a lighter material for the outer packaging of soft-pack lithium batteries and is a key material for the development of lithium batteries towards lightweight and small size. And because of its low shell strength, the mechanical stress on the internal structure during the cycle is small, which is beneficial to the cycle life.

[0003] However, during the manufacturing process of soft-pack batteries, the aluminum-plastic film needs to be stamped through a punching process, that is, a forming mold is used to punch a hole on the aluminum-plastic film under heating to accommodate the winding core. Due to the limitations of the aluminum-plastic film material itself, if the punching depth is too deep (>6mm), there is a risk of rupture, which leads to the limited thickness of the soft-pack battery cell and limits the capacity of the battery cell. In addition, during the use of existing soft-pack batteries, the bottom of the battery cell is easily deformed by external forces, and may even cause damage to the electrode group, thereby adversely affecting the normal use of the battery cell. Utility Model Content

[0004] In view of this, the utility model aims to provide a soft-pack battery to optimize its structure and facilitate the production of a battery cell with a larger capacity.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] A soft pack battery comprises a shell, and an electrode group arranged in the shell;

[0007] The housing comprises a housing body and a support frame arranged on the housing body;

[0008] The housing body comprises a first portion located at the bottom, and a second portion disposed at two opposite sides of the first portion and bent upward;

[0009] The support frame is arranged on the first part and can support the second parts on both sides, and the support frame and the second parts on both sides form an accommodating space for accommodating the pole group.

[0010] Furthermore, the cross section of the support frame is "U"-shaped, and has a bottom plate connected to the first part, and side plates abutting against the second parts on both sides.

[0011] Furthermore, the shell body is made of aluminum-plastic film.

[0012] Furthermore, the top ends of the second parts on both sides and the corresponding positions at the left and right ends are hot-melt connected.

[0013] Furthermore, the support frame is made of one of polypropylene and polyethylene.

[0014] Furthermore, the bottom plate is connected to the first part by hot melt.

[0015] Furthermore, the bottom of the pole group abuts against the bottom plate, and the two sides of the pole group in the thickness direction abut against the side plates on both sides respectively.

[0016] Furthermore, the height of the side panels is 1mm-10mm.

[0017] Furthermore, a receiving hole for receiving electrolyte is provided on a side of the support frame facing the electrode group.

[0018] Furthermore, the accommodating holes are provided on the bottom plate, and are a plurality of accommodating holes arranged at intervals along the length direction of the bottom plate.

[0019] Compared with the prior art, the utility model has the following advantages:

[0020] The soft-pack battery described in the utility model supports the second part by providing a support frame on the outer shell body, and the support frame and the second part on both sides are formed to form a storage space for accommodating the electrode group. During the production process, the outer shell body can be bent at both ends along the width direction of the support frame, and it is no longer necessary to punch holes in the outer shell body, which is conducive to the production of soft-pack batteries with larger capacity. In addition, the support frame can protect the bottom of the soft-pack battery to prevent the bottom of the soft-pack battery from being deformed by external force, and the problem of damage to the electrode group caused by this.

[0021] In addition, the cross section of the support frame is "U"-shaped, and has a bottom plate connected to the first part, and side plates abutting against the second parts on both sides. The structure is simple and the weight is light. The space between the bottom plate and the side plates can accommodate the electrode group, which is conducive to ensuring the energy density of the soft-pack battery. And by making the support frame made of one of polypropylene and polyethylene, it is conducive to making the support frame have better insulation performance and better resistance to electrolyte corrosion, and also have a certain rigidity.

[0022] In addition, by providing a receiving hole for receiving the electrolyte, the electrolyte injected into the shell can be partially stored in the receiving hole, thereby facilitating the subsequent electrolyte infiltration effect on the electrode group. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0024] Figure 1 This is a schematic diagram of the structure of the soft-pack battery according to an embodiment of the utility model;

[0025] Figure 2 This is a schematic diagram of the structure of the housing body according to an embodiment of the utility model;

[0026] Figure 3 This is a schematic diagram of the structure of the housing body and the support frame according to an embodiment of the utility model;

[0027] Figure 4 It is a schematic structural diagram of the support frame described in an embodiment of the utility model.

[0028] Description of reference numerals:

[0029] 1. Shell body; 101. First part; 102. Second part; 2. Support frame; 201. Bottom plate; 202. Side plate; 3. Pole group; 4. Pole ear; 5. Accommodation hole. DETAILED DESCRIPTION

[0030] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0031] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0032] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection", and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0033] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0034] This embodiment relates to a soft pack battery, the overall structure of which is as follows: Figure 1 and Figure 2 As shown in , the soft pack battery includes a shell and a pole group 3 disposed in the shell. The shell includes a shell body 1 and a support frame 2 disposed on the shell body 1. The shell body 1 has a first part 101 located at the bottom and a second part 102 disposed on two opposite sides of the first part 101 and bent upward. The support frame 2 is disposed on the first part 101 and can support the second parts 102 on both sides, and the support frame 2 and the second parts 102 on both sides form a receiving space for receiving the pole group 3.

[0035] It can be understood that in this embodiment, the support frame 2 is provided on the shell body 1 to support the second part 102, and the support frame 2 and the second part 102 on both sides are formed to form a storage space for accommodating the electrode group 3. During the production process, the shell body 1 can be bent along the two ends of the support frame 2 in the width direction, and it is no longer necessary to punch the shell body 1, which is conducive to the production of soft-pack batteries with larger capacity. In addition, the support frame 2 can protect the bottom of the soft-pack battery to prevent the bottom of the soft-pack battery from being deformed by external force, and the problem of damage to the electrode group 3 caused by this.

[0036] Based on the above overall introduction, as a preferred implementation method, Figure 4 As shown in the figure, in this embodiment, the cross section of the support frame 2 is "U"-shaped, and has a bottom plate 201 connected to the first part 101, and side plates 202 abutting against the second parts 102 on both sides. Such a configuration has a simple structure and a light weight, and the space between the bottom plate 201 and the side plate 202 can accommodate the electrode group 3, which is conducive to ensuring the energy density of the soft-pack battery.

[0037] Preferably, in this embodiment, the housing body 1 is made of aluminum-plastic film, which is light and easy to obtain. In addition, in the specific implementation, the top of the second part 102 on both sides and the corresponding positions of the left and right ends are hot-melt connected, the connection method is simple, and it is easy to ensure the sealing of the soft-pack battery.

[0038] As a preferred embodiment, in this embodiment, the support frame 2 is made of one or both of polypropylene and polyethylene. It should be noted that the support frame 2 in this embodiment is made of one or both of polypropylene and polyethylene, which specifically means that the support frame 2 can be made of only polypropylene, only polyethylene, or a blend of polypropylene and polyethylene, and polypropylene, polyethylene, and a blend of polypropylene and polyethylene are all commonly used materials in the prior art, and will not be described in detail here.

[0039] By making the support frame 2 from one or both of polypropylene and polyethylene, the support frame 2 has better insulation performance and better resistance to electrolyte corrosion, and also has a certain rigidity. In addition, as a preferred embodiment, in this embodiment, the bottom plate 201 is connected to the first part 101 by hot melt, and the connection method is simple, and it is easy to achieve the connection between the support frame 2 and the shell body 1. Of course, in other embodiments, the bottom plate 201 and the first part 101 can also be connected by other methods, such as bonding.

[0040] As a preferred embodiment, the bottom of the electrode group 3 is in contact with the bottom plate 201, and the two sides of the electrode group 3 in the thickness direction are respectively in contact with the side plates 202 on both sides. This arrangement facilitates fixing the electrode group 3 through the support frame 2 to prevent the electrode group 3 from shaking in the housing, and the support frame 2 can also provide a good protective effect on the electrode group 3 to prevent the electrode group 3 from being squeezed.

[0041] Preferably, in this embodiment, the height of the side plate 202 is 1 mm-10 mm, and specifically can be 1 mm, 3 mm, 5 mm, 8 mm, and 10 mm, etc. By setting the height of the side plate 202 within the above-mentioned size range, it is beneficial to protect the electrode group 3 while making the weight of the battery lighter, which is beneficial to ensuring the energy density of the battery.

[0042] As a preferred embodiment, a receiving hole 5 for receiving the electrolyte is provided on one side of the support frame 2 facing the electrode group 3. By providing the receiving hole 5 for receiving the electrolyte, the electrolyte injected into the housing can be partially stored in the receiving hole 5, thereby facilitating the subsequent electrolyte infiltration effect on the electrode group 3.

[0043] In a specific implementation, the receiving holes 5 are provided on the bottom plate 201, and are arranged in a plurality of spaces along the length direction of the bottom plate 201. Figure 3 and Figure 4 As shown in the figure, in this embodiment, three spaced accommodating holes 5 are provided, and two of the accommodating holes 5 are respectively provided near the two ends of the length direction of the bottom plate 201, and the other accommodating hole 5 is provided near the middle position of the bottom plate 201. Of course, in other embodiments, the accommodating holes 5 may be provided in other numbers, such as two, four, and five. By providing the accommodating holes 5 on the bottom plate 201 and making them spaced in a plurality, it is beneficial to further ensure the infiltration effect of the electrolyte on the electrode group 3.

[0044] When manufacturing the soft-pack battery of this embodiment, the support frame 2 can be firstly hot-melted at a preset position on the aluminum-plastic film, and then the aluminum-plastic film is bent to form the second part 102, and the side plate 202 of the support frame 2 is abutted against the second part 102, so as to support the second part 102. Then, the electrode group 3 is installed in the shell, and the two ends and the top of the second part 102 on both sides are correspondingly connected in the length direction by hot-melt connection, and then the electrolyte is injected into the battery, and the battery is secondary packaged to complete the manufacturing, and the pole ear 4 of the battery after the manufacturing is completed extends from the top of the battery.

[0045] The soft-pack battery of this embodiment supports the second part 102 by providing a support frame 2 on the outer shell body 1, and the support frame 2 and the second part 102 on both sides form a receiving space for the electrode group 3. During the production process, it is no longer necessary to punch holes in the outer shell body 1, which is conducive to the production of soft-pack batteries with larger capacity. In addition, the support frame 2 can protect the bottom of the soft-pack battery to prevent the bottom of the soft-pack battery from being deformed by external force, and the problem of damage to the electrode group 3 caused by this. And by providing a receiving hole 5 on the support frame 2, it is conducive to ensuring the infiltration effect of the electrolyte on the electrode group 3.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A soft pack battery, characterized in that: It comprises a housing, and a pole group arranged in the housing; The housing comprises a housing body and a support frame arranged on the housing body; The housing body comprises a first portion located at the bottom, and a second portion disposed at two opposite sides of the first portion and bent upward; The support frame is arranged on the first part and can support the second parts on both sides, and the support frame and the second parts on both sides form an accommodating space for accommodating the pole group.

2. The soft pack battery according to claim 1, characterized in that: The cross section of the support frame is "U"-shaped, and has a bottom plate connected to the first part, and side plates abutting against the second parts on both sides.

3. The soft pack battery according to claim 2, characterized in that: The shell body is made of aluminum-plastic film.

4. The soft pack battery according to claim 3, characterized in that: The top ends of the second parts on both sides and the corresponding positions at the left and right ends are all hot-melt connected.

5. The soft pack battery according to claim 3, characterized in that: The support frame is made of one of polypropylene and polyethylene.

6. The soft pack battery according to claim 5, characterized in that: The bottom plate is thermally melt-connected to the first portion.

7. The soft pack battery according to claim 2, characterized in that: The bottom of the pole group is in contact with the bottom plate, and both sides of the pole group in the thickness direction are in contact with the side plates at both sides respectively.

8. The soft pack battery according to claim 2, characterized in that: The height of the side plate is 1mm-10mm.

9. The soft pack battery according to any one of claims 2 to 8, characterized in that: A receiving hole for receiving electrolyte is provided on one side of the support frame facing the electrode group.

10. The soft pack battery according to claim 9, characterized in that: The accommodating holes are arranged on the bottom plate, and are a plurality of accommodating holes arranged at intervals along the length direction of the bottom plate.

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