Power battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a power battery. The power battery comprises a pole group. Side plates are arranged on the two sides of the pole group in the length direction, and the length A of each side plate is larger than the length a of the pole group. The length A of the side plate is set to be larger than the length a of the pole group, and the side plate can effectively protect the pole group in the assembling process of the pole group, so that the safety performance and the yield of the whole power battery are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a power battery. Background Art

[0002] Power batteries are the main power source for new energy vehicles. With the popularization of new energy vehicles, users have higher and higher requirements for power batteries. Users' requirements for power batteries are mainly reflected in the safety performance, energy density and cruising range of power batteries.

[0003] As one of the internal components of the power battery, the side plate plays a role in protecting the electrode group and preventing the electrode group from being damaged during the assembly process. The size of the side plate in the prior art cannot meet the requirements of protecting the electrode group in terms of design. Usually, the length of the side plate is smaller than the length of the electrode group, which causes damage to the electrode group during the assembly process, thereby reducing the safety performance of the power battery or causing a high defective rate.

[0004] Therefore, there is an urgent need to propose a power battery with higher safety performance to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a power battery, in which the side plates can effectively protect the pole groups and have higher safety performance.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Power battery, including:

[0008] The pole group is provided with side plates on both sides along the length direction of the pole group, and the length A of the side plates is greater than the length a of the pole group.

[0009] Optionally, the relationship between the length A of the side plate and the length a of the pole group is a+6mm≤A≤a+16mm or 1.01a≤A≤1.2a.

[0010] Optionally, the relationship between the height B of the side plate and the height b of the pole group is 0.85b≤B≤1.3b.

[0011] Optionally, the side plate and the pole group are bonded by adhesive tape.

[0012] Optionally, there are multiple adhesive tapes, and the multiple adhesive tapes are arranged along the length direction of the pole group.

[0013] Optionally, the relationship between the dimension C of the tape along the length direction of the pole group and the length a of the pole group is a-20mm≤C≤a-4mm.

[0014] Optionally, the relationship between the dimension C of the tape along the length direction of the electrode group and the length a of the electrode group is 0.8a ≤ C ≤ 0.99a.

[0015] Optionally, the tape includes a first part and a second part. The first part is bonded to the side surface of the side plate, and the second part is bonded to the end surface of the electrode group.

[0016] Optionally, the dimension D of the second part in the width direction of the electrode group satisfies 5 mm ≤ D ≤ 20 mm.

[0017] Optionally, the cross-sectional shape of the side plate is rectangular, U-shaped, L-shaped, wavy or U-shaped.

[0018] Beneficial effects:

[0019] The power battery provided by the present utility model has a structural form in which the length A of the side plate is set to be greater than the length a of the electrode group. During the assembly process of the electrode group, the side plate can effectively protect the electrode group and prevent the electrode group from being damaged during the assembly process. Compared with the prior art in which no side plate is provided or the length of the side plate is less than the length of the electrode group, the side plate provided by the present utility model can effectively protect the electrode group, thereby improving the safety performance and yield of the entire power battery. Description of the drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present invention and these drawings.

[0021] Figure 1 is a schematic structural diagram of the electrode group provided by the present utility model;

[0022] Figure 2 is a schematic structural diagram of the side plate provided by the present utility model;

[0023] Figure 3 is a schematic structural diagram of the bonded electrode group and side plate provided by the present utility model;

[0024] Figure 4 is a schematic cross-section of the side plate provided by the present utility model Figure 1 ;

[0025] Figure 5 is a schematic cross-section of the side plate provided by the present utility model Figure 2 ;

[0026] Figure 6 is a schematic cross-section of the side plate provided by the present utility model Figure 3 ;

[0027] Figure 7 This is a schematic diagram of the cross section of the side panel provided by the utility model. Figure 4 ;

[0028] Figure 8 This is a schematic diagram of the cross section of the side panel provided by the utility model. Figure 5 ;

[0029] Fig. 9 This is a schematic diagram of the cross section of the side panel provided by the utility model. Figure 6 .

[0030] In the figure:

[0031] 100, pole group; 200, side plate; 300, tape. DETAILED DESCRIPTION

[0032] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 indirectly connected 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 according to specific circumstances.

[0035] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0036] See also Figure 1 and Figure 2 This embodiment provides a power battery, including an electrode group 100. Side plates 200 are provided on both sides along the length direction of the electrode group 100, and the length A of the side plates 200 is greater than the length a of the electrode group 100.

[0037] The power battery described above has a structure in which the length A of the side plate 200 is set to be greater than the length a of the electrode group 100. During the assembly process of the electrode group 100, the side plate 200 can effectively protect the electrode group 100 and prevent the electrode group 100 from being damaged during the assembly process. Compared with the prior art in which no side plate 200 is provided or the length A of the side plate 200 is less than the length a of the electrode group 100, the side plate 200 provided in this embodiment can effectively protect the electrode group 100, thereby improving the safety performance and yield rate of the entire power battery.

[0038] Further, in this embodiment, the relationship between the length A of the side plate 200 and the length a of the electrode group 100 is a+6mm≤A≤a+16mm or 1.01a≤A≤1.2a.

[0039] It can be understood that the length a of the electrode group 100 is set according to specific use needs and is not specifically limited here. For example, the length A of the side plate 200 can be a+6mm, a+8mm, a+10mm, a+12mm, a+14mm or a+16mm, etc. Alternatively, the length A of the side plate 200 can be 1.01a, 1.05a, 1.1a, 1.15a, or 1.2a, etc.

[0040] Furthermore, the relationship between the height B of the side plate 200 and the height b of the pole group 100 is 0.85b≤B≤1.3b.

[0041] That is, the height B of the side plate 200 can be greater than the height b of the electrode group 100, or less than the height b of the electrode group 100. The height b of the electrode group 100 is set according to the use requirements and is not specifically limited here. For example, the height B of the side plate 200 can be 0.85b, 0.9b, 0.95b, 1.0b, 1.05b, 1.1b, 1.15b, 1.2b, 1.25b or 1.3b, etc.

[0042] Further, see Figure 3 In this embodiment, the side plate 200 and the electrode group 100 are bonded by an adhesive tape 300 .

[0043] The adhesive tape 300 is used for fastening firmly, conveniently and at low cost. Of course, in other embodiments, other methods can also be used to connect the side plate 200 and the electrode group 100.

[0044] Furthermore, there are multiple adhesive tapes 300 , and the multiple adhesive tapes 300 are arranged along the length direction of the electrode group 100 .

[0045] Optionally, the sizes of the multiple adhesive tapes 300 can be the same or different, as long as the electrode group 100 and the side plate 200 are fixedly bonded. Optionally, the multiple adhesive tapes 300 are arranged at intervals or spliced ​​together. Exemplarily, the number of adhesive tapes 300 can be two, three, four or five, etc. Of course, in other embodiments, only one adhesive tape 300 can be used for bonding.

[0046] Furthermore, the relationship between the dimension C of the adhesive tape 300 along the length direction of the electrode group 100 and the length a of the electrode group 100 is a-20 mm≤C≤a-4 mm.

[0047] Optionally, the dimension C of the tape 300 along the length direction of the electrode group 100 may be a-4 mm, a-8 mm, a-12 mm, a-16 mm or a-20 mm, etc.

[0048] Alternatively, the relationship between the dimension C of the adhesive tape 300 along the length direction of the electrode assembly 100 and the length a of the electrode assembly 100 is 0.8a≤C≤0.99a.

[0049] For example, the dimension C of the tape 300 along the length direction of the electrode group 100 may be 0.8a, 0.85a, 0.9a, 0.95a or 0.99a, etc.

[0050] Furthermore, the adhesive tape 300 includes a first portion and a second portion, the first portion is bonded to the side surface of the side plate 200 , and the second portion is bonded to the end surface of the electrode group 100 .

[0051] In this embodiment, the adhesive tape 300 is bonded to the side surface of the side plate 200 and the upper end surface of the electrode group 100. In other embodiments, the adhesive tape 300 may cover the upper end surface of the electrode group 100, the side surface of the side plate 200, and the lower end surface of the electrode group 100, or the front end surface of the electrode group 100, the side surface of the side plate 200, and the rear end surface of the electrode group 100. Specifically, it can be bonded according to needs.

[0052] Further, the dimension D of the second part in the width direction of the electrode group 100 satisfies 5 mm ≤ D ≤ 20 mm.

[0053] Optionally, the dimension D of the second part in the width direction of the electrode group 100 can be 5 mm, 10 mm, 15 mm, 20 mm, etc.

[0054] Further, referring to Figures 4 to 9 , the cross-sectional shape of the side plate 200 can be rectangular (as shown in Figure 4 ), C-shaped (as shown in Figure 5 ), L-shaped (as shown in Figure 6 ), wavy (as shown in Figure 7 ), U-shaped (as shown in Figure 8 ), or semi-U-shaped (as shown in Fig. 9 ).

[0055] By adopting C-shaped, L-shaped, wavy, U-shaped or semi-U-shaped, the stiffness of the side plate 200 can be improved when the weight of the side plate 200 is relatively light, ensuring that the side plate 200 is not easily deformed and has strong anti-torsion ability.

[0056] Obviously, the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A power battery, characterized in that: Including: A plate group (100), side plates (200) are arranged on both sides along the length direction of the plate group (100), the length A of the side plates (200) is greater than the length a of the plate group (100). During the assembly process of the plate group (100), the side plates (200) can play a role in protecting the plate group (100) and prevent the plate group (100) from being damaged during the assembly process.

2. The power battery according to claim 1, characterized in that: The relationship between the length A of the side plates (200) and the length a of the plate group (100) is a + 6mm ≤ A ≤ a + 16mm or 1.01a ≤ A ≤ 1.2a.

3. The power battery according to claim 1, characterized in that: The relationship between the height B of the side plates (200) and the height b of the plate group (100) is 0.85b ≤ B ≤ 1.3b.

4. The power battery according to claim 1, characterized in that: The side plates (200) and the plate group (100) are bonded by an adhesive tape (300).

5. The power battery according to claim 4, characterized in that: There are multiple adhesive tapes (300), and the multiple adhesive tapes (300) are arranged along the length direction of the plate group (100).

6. The power battery according to claim 4, characterized in that: The relationship between the dimension C of the adhesive tape (300) along the length direction of the plate group (100) and the length a of the plate group (100) is a - 20mm ≤ C ≤ a - 4mm.

7. The power battery according to claim 4, characterized in that: The relationship between the dimension C of the adhesive tape (300) along the length direction of the plate group (100) and the length a of the plate group (100) is 0.8a ≤ C ≤ 0.99a.

8. The power battery according to claim 4, characterized in that: The adhesive tape (300) includes a first part and a second part. The first part is bonded to the side surface of the side plate (200), and the second part is bonded to the end surface of the plate group (100).

9. The power battery according to claim 8, characterized in that: The dimension D of the second part in the width direction of the plate group (100) satisfies 5mm ≤ D ≤ 20mm.

10. The power battery according to any one of claims 1 to 9, characterized in that: The cross-sectional shape of the side plates (200) is rectangular, C-shaped, L-shaped, wavy or U-shaped.

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