Battery end plate and battery and battery pack comprising same

Abstract

The utility model relates to the technical field of batteries, and particularly provides a battery end plate, a battery comprising the same and a battery pack. Wherein the battery end plate comprises an end plate body and a tab shaping part arranged on the end plate body, the tab shaping part comprises two folding plates which are obliquely arranged, the two folding plates are arranged in a splayed shape, and a tab gap is formed between the two folding plates. In the battery end plate, the two adjacent folding plates on the battery end plate are used for folding the plurality of tabs led out from the battery cell to form the tab bundle, so that the folded tab bundle penetrates out of the tab gap between the two folding plates to the outer side surface of the end plate body, and the tab bundle can be conveniently welded with a pole in a unified manner, so that the position precision of the tabs is improved, and the reliability of the battery end plate is improved. And the battery performance or safety problem caused by tab dislocation is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and specifically proposes a battery end plate, a battery including the same, and a battery pack. Background Art

[0002] In related technologies, square batteries generally refer to batteries with square steel or aluminum shells. They have high energy density and long cycle life, and therefore have been widely used in many fields.

[0003] Specifically, the tab is a crucial component of a prismatic battery. It's a metal conductor that connects the positive and negative electrodes of the battery cell and serves as a contact point during charging and discharging. The tab is typically made of a composite of metal strips and a film. The metal strips conduct electricity, while the film acts as an insulator, preventing short circuits between the metal strips and the rest of the battery.

[0004] However, during the battery manufacturing process, the position accuracy of the tabs during winding or stacking is poor, which can easily lead to uneven current distribution, short circuit, flatulence, leakage and other battery performance problems or safety hazards due to misalignment of the tabs. Utility Model Content

[0005] The purpose of this application is to solve at least some of the technical problems mentioned above, and this purpose is achieved through the following technical solutions:

[0006] In the first aspect, the present application proposes a battery end plate, which includes an end plate body and a tab shaping portion provided on the end plate body. The tab shaping portion includes two obliquely arranged folding plates, and the two folding plates are arranged in an "eight" shape, forming a tab gap between the two.

[0007] In some embodiments, the inclination angle of the gathering plate is α, then 3°≤α≤45°.

[0008] In some embodiments, the lower portion of the folding plate has a straight section, and the straight section is pressed and connected to the tab.

[0009] In some embodiments, a dimension of the straight section along the width direction of the end plate body is d1, and 0.5 mm ≤ d1 ≤ 20 mm.

[0010] In some embodiments, along the thickness direction, the distance between the straight section and the inner side surface of the end plate body is d2, 0mm≤d2≤2mm.

[0011] In some embodiments, the end plate body is provided with at least two groups of tab shaping portions along the length direction; and / or, the end plate body is provided with at least two groups of tab shaping portions along the width direction.

[0012] In some embodiments, a plurality of exhaust holes are provided in the middle portion of the end plate body.

[0013] In some embodiments, the end plate body is provided with a plurality of drainage holes at both ends in the length direction.

[0014] In a second aspect, the present application provides a battery comprising the battery end plate according to the first aspect.

[0015] In a third aspect, the present application proposes a battery pack comprising the battery of the second aspect.

[0016] The technical solution proposed in this application has at least the following technical effects:

[0017] In the present application, two adjacent folding plates on the battery end plate fold the multiple tabs led out from the battery cell to form a tab bundle, so that the folded tab bundle passes through the tab gap between the two folding plates to the outer side of the end plate body, making it convenient to uniformly weld the tab bundle to the pole column, thereby improving the position accuracy of the tab and avoiding battery performance or safety problems caused by tab misalignment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to better integrate the contents shown in the drawings with the contents described in the specific embodiments, a brief introduction to the drawings is given below. It is understood that the drawings mentioned below are only schematic illustrations of the relevant technical solutions and some embodiments of the technical solutions of this application. Without making any creative efforts, those skilled in the art can also create drawings showing other embodiments.

[0019] Specifically, the annotations to the drawings of the specification are as follows:

[0020] Figure 1 This is a schematic structural diagram of a battery end plate according to some embodiments of the present application;

[0021] Figure 2 A schematic cross-sectional view of a battery end plate according to some embodiments of the present application;

[0022] Figure 3 Schematic diagram of the structure of the battery described in some embodiments of the present application;

[0023] Figure 4 Schematic cross-sectional view of a battery according to some embodiments of the present application.

[0024] Specifically, the annotations of the accompanying drawings are as follows:

[0025] 100, battery; 110, battery cell; 120, tab; 130, battery end plate; 131, retraction plate; 132, tab gap; 133, straight section; 134, vent; 135, drainage hole; X, width direction; Y, length direction; Z, thickness direction. DETAILED DESCRIPTION

[0026] To make the contents of the embodiments of this application clearer, the following description will be made in conjunction with the accompanying drawings. It is understood that the contents mentioned below are only some of the embodiments of this application, and all embodiments are listed in detail. Therefore, without inventive work, other embodiments obtained based on the following embodiments fall within the scope of protection of this application.

[0027] It should be understood that the terms used herein are for the purpose of describing specific embodiments only and are not intended to strictly limit the technical solutions unless the context clearly indicates otherwise. For example, the use of "a," "an," and "the" to modify a feature does not exclude the possibility that the feature may be plural in other embodiments.

[0028] It should be understood that the terms "include," "comprising," and "having" are open-ended, indicating the presence of the stated features but not excluding the possibility of additional features in the embodiment. Similarly, when terms such as first, second, etc. are used herein to describe multiple features, they are merely used to distinguish one feature from another and do not imply a sequence or order unless the context clearly indicates otherwise.

[0029] It should be understood that, unless the context clearly indicates otherwise, the terms "disposed," "connected," and "installed" should be interpreted broadly. For example, they may refer to fixed, detachable, or integral connections; they may be directly connected or indirectly connected through a medium. Those skilled in the art will understand the specific meanings of these terms in the context of the text based on the specific circumstances.

[0030] In addition, for the convenience of description, the text will use terms of spatial relative relationships to illustrate the position of one feature relative to another feature, such as "inside", "outside", "end", "side", "upper", "middle", "lower", "high", "lower", "axial", "circumferential", "radial", "horizontal", "vertical", "first direction", "second direction", etc. It can be understood that the spatial relative relationship between two features should include other specific situations in addition to those shown in the drawings of the specification.

[0031] The embodiments of the present application are described below with reference to the accompanying drawings.

[0032] First, refer to Figures 1 to 4 The present application proposes a battery end plate 130, which includes an end plate body and a tab 120 shaping portion provided on the end plate body. The tab 120 shaping portion includes two obliquely arranged folding plates 131. The two folding plates 131 are arranged in an "eight" shape, and a tab gap 132 is formed between the two.

[0033] In the present application, two adjacent folding plates 131 on the battery end plate 130 fold the multiple tabs 120 led out from the battery cell 110 to form a tab bundle, so that the folded tab bundle passes through the tab gap 132 between the two folding plates 131 to the outer side of the end plate body, making it convenient to uniformly weld the tab bundle to the pole column, thereby improving the position accuracy of the tab 120 and avoiding misalignment of the tab 120 to cause battery performance or safety problems.

[0034] In some embodiments, reference Figure 2 , the inclination angle of the gathering plate 131 is α, then 3°≤α≤45°. In some embodiments, the lower portion of the gathering plate 131 has a straight section 133, which is pressed against the tab 120. In some embodiments, the dimension of the straight section 133 along the width direction X of the end plate body is d1, with 0.5 mm ≤ d1 ≤ 20 mm. In some embodiments, the distance between the straight section 133 and the inner side surface of the end plate body along the thickness direction Z is d2, with 0 mm ≤ d2 ≤ 2 mm.

[0035] In the above embodiment, the angle between the gathering plate 131 and the horizontal plane is its inclination angle α. If α is too large or too small, the gathering effect of the tab 120 will be affected. Moreover, if α is too large, the bottom of the gathering plate 131 may crush the tab 120. Therefore, α should be moderate, for example, α can be 3°, 10°, or 45°.

[0036] Furthermore, the straight section 133 at the bottom of the gathering plate 131 presses against a portion of the tab 120. If the inclination angle of the gathering plate 131 remains unchanged and the dimension d1 of the straight section 133 along the width direction X is too small, the distance d2 between the straight section 133 and the inner side of the end plate body will be too small, which may damage the tab 120. If d1 is too large, d2 will be too large, and the straight section 133 will not press tightly against the tab 120, resulting in a loose fit on the tab 120 and a difficulty in gathering the tab 120. Therefore, d1 should be moderate, for example, d1 can be 0.5 mm, 10 mm, or 20 mm, and d2 should not be greater than 2 mm.

[0037] In some embodiments, reference Figure 1 and Figure 3 The end plate body is provided with at least two sets of tab 120 shaping portions along the length direction Y; and / or, the end plate body is provided with at least two sets of tab 120 shaping portions along the width direction X. In some embodiments, a plurality of vent holes 134 are provided in the middle of the end plate body. In some embodiments, a plurality of drainage holes 135 are provided at both ends of the end plate body along the length direction Y.

[0038] In the above embodiment, along the length direction Y, the two sets of tabs 120 shaping portions of the end plate body can gather the positive tabs and negative tabs of a battery cell 110; along the width direction X, the two sets of tabs 120 shaping portions of the end plate body can gather the tabs 120 of two battery cells 110.

[0039] It should be noted that the exhaust hole 134 is opposite to the explosion-proof valve of the battery 100, which is conducive to discharging the gas inside the battery 100; the drainage hole 135 can discharge the added electrolyte into the battery 100, avoiding the accumulation of electrolyte on the end plate body and affecting the battery performance.

[0040] In a second aspect, the present application provides a battery 100 , which includes the battery end plate 130 according to the first aspect.

[0041] In a third aspect, the present application proposes a battery 100 package, which includes the battery 100 of the second aspect.

[0042] In the above embodiments, the battery 100 of the second aspect and the battery pack 100 of the third aspect both include the battery 100 of the first aspect. Therefore, the battery 100 of the second aspect and the battery pack 100 of the third aspect have at least all the technical effects of the battery end plate 130 of the first aspect, and their specific technical effects will not be repeated here.

[0043] The embodiments of the present application only illustrate the structures of the battery 100 of the second aspect and the battery 100 package of the third aspect that are related to the improvement points of the present application, but do not mean that they do not have other structures. For example, the battery 100 also includes a shell for accommodating the battery cells 110, and / or the battery 100 package also includes a frame for encapsulating multiple batteries 100, etc. Other structures will not be described one by one here.

[0044] In particular, the term "and / or" in this application should be understood as follows:

[0045] In the first case, the term “and / or” located between a first subject and a second subject includes any one of the following meanings: (1) only the first subject; (2) only the second subject; and (3) the first subject and the second subject.

[0046] In the second case, the term "and / or" between the last two entities in three or more entities means including at least any one of the entities. For example, "the first entity, the second entity and / or the third entity" has the same meaning as "the first entity and / or the second entity and / or the third entity", specifically including the following combinations: (1) only the first entity; (2) only the second entity; (3) only the third entity; (4) the first entity and the second entity without the third entity; (5) the first entity and the third entity without the second entity; (6) the second entity and the third entity without the first entity; and (7) the first entity, the second entity, and the third entity.

[0047] In addition, although the above content describes the embodiments of the present application in conjunction with the accompanying drawings, those skilled in the art can also make various modifications and variations without departing from the concept of the present application, and such modifications and variations will fall within the scope of protection of the present application.

Claims

1. A battery end plate, characterized in that: It includes an end plate body and a tab shaping portion arranged on the end plate body. The tab shaping portion includes two obliquely arranged folding plates. The two folding plates are arranged in an "eight" shape, and a tab gap is formed between the two plates.

2. The battery end plate according to claim 1, characterized in that: The inclination angle of the folding plate is α, then 3°≤α≤45°.

3. The battery end plate according to claim 1, characterized in that: The lower portion of the folding plate has a straight section, and the straight section is pressed and connected with the tab.

4. The battery end plate according to claim 3, characterized in that: The dimension of the straight section along the width direction of the end plate body is d1, 0.5mm≤d1≤20mm.

5. The battery end plate according to claim 3, characterized in that: Along the thickness direction, the distance between the straight section and the inner side surface of the end plate body is d2, 0mm≤d2≤2mm.

6. The battery end plate according to any one of claims 1 to 5, characterized in that: The end plate body is provided with at least two groups of the tab shaping portions along the length direction; and / or the end plate body is provided with at least two groups of the tab shaping portions along the width direction.

7. The battery end plate according to any one of claims 1 to 5, characterized in that: A plurality of exhaust holes are provided in the middle of the end plate body.

8. The battery end plate according to any one of claims 1 to 5, characterized in that: The end plate body is provided with a plurality of drainage holes at both ends in the length direction.

9. A battery, characterized in that: A battery end plate comprising the battery end plate according to any one of claims 1 to 8.

10. A battery pack, characterized in that: A battery comprising the battery of claim 9.

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