Battery end plate as well as single 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 single battery comprising the battery end plate and a battery pack. The battery end plate comprises a positive electrode area and a negative electrode area, the positive electrode area and the negative electrode area are located at the two ends of the battery end plate in the length direction respectively, and tab through holes are formed in the positive electrode area and the negative electrode area respectively and penetrate through the battery end plate in the thickness direction. And the tab through hole is used for the tab to penetrate from the inner side surface of the battery end plate to the outer side surface of the battery end plate. According to the battery, the tab through holes are formed in the positive electrode area and the negative electrode area at the two ends of the cover plate in the length direction respectively and used for enabling the tabs in the battery to penetrate out to the outside to be folded, so that the tabs are electrically connected with the pole columns, space is saved for the interior of the battery, the volume energy density is provided, welding assembly is facilitated, and the product yield is increased.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and specifically proposes a battery end plate and a single battery and a battery pack comprising the same. 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 cover plate is an important component in a square battery. It is used to seal the opening of the shell and protect the internal winding core of the battery.

[0004] However, the tabs are folded on the inner side of the cover, which occupies a large space inside the battery and is not conducive to improving the volume energy density of the battery. 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 a positive electrode region and a negative electrode region, the positive electrode region and the negative electrode region are respectively located at the two ends of the length direction of the battery end plate, and the positive electrode region and the negative electrode region are respectively provided with a pole ear through hole, the pole ear through hole penetrates the battery end plate along the thickness direction, and the pole ear through hole is used for the pole ear to pass through from the inner side of the battery end plate to the outer side of the battery end plate.

[0007] In some embodiments, the dimension of the tab along the length direction is C, the dimension of the tab through hole along the length direction is A, and C+3mm≤A≤C+30mm.

[0008] In some embodiments, the dimension of the tab through hole along the width direction is B, and 3 mm ≤ B ≤ 30 mm.

[0009] In some embodiments, the tab through hole is rectangular or racetrack-shaped, and a chamfer is provided between two adjacent sides of the tab through hole, wherein the chamfer is a rounded corner or a chamfered corner.

[0010] In some embodiments, the battery end plate is provided with an explosion-proof valve hole and a liquid injection hole between the positive electrode region and the negative electrode region.

[0011] In some embodiments, the positive electrode region and / or the negative electrode region has one tab through hole, and the explosion-proof valve holes are distributed along the length direction.

[0012] In some embodiments, the positive electrode region and / or the negative electrode region has two tab through holes, and the explosion-proof valve holes are distributed along the width direction.

[0013] In some embodiments, a reinforcing rib is provided in the explosion-proof valve hole, and the explosion-proof valve hole cover is sealed with an explosion-proof valve plate, and the explosion-proof valve plate and the reinforcing rib are spaced apart along the thickness direction.

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

[0015] In a third aspect, the present application proposes a battery pack comprising the single cell according to the second aspect.

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

[0017] In the present application, the cover plate is provided with tab through holes in the positive electrode area and the negative electrode area at both ends in the length direction, which are used to pass the tabs inside the battery through to the outside for folding, thereby electrically connecting the tabs to the poles, saving space inside the battery, providing volume energy density, and facilitating welding and assembly, thereby improving product yield. 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 This is a schematic structural diagram of the battery end plates described in other embodiments of the present application.

[0022] Specifically, the annotations of the accompanying drawings are as follows:

[0023] 100, battery end plate; 110, tab through hole; 120, explosion-proof valve hole; 130, injection hole; 140, reinforcement rib; 150, explosion-proof valve plate; X, length direction; Y, width direction; Z, thickness direction. DETAILED DESCRIPTION

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] The embodiments of the present application are described below with reference to the accompanying drawings.

[0030] First, refer to Figure 1 and Figure 2 The present application proposes a battery end plate 100, which includes a positive electrode region and a negative electrode region. The positive electrode region and the negative electrode region are respectively located at the two ends of the length direction X of the battery end plate 100, and the positive electrode region and the negative electrode region are respectively provided with a tab through-hole 110. The tab through-hole 110 penetrates the battery end plate 100 along the thickness direction Z. The tab through-hole 110 is used for the tab to pass through from the inner side surface of the battery end plate 100 to the outer side surface of the battery end plate 100.

[0031] In the present application, the cover plate is provided with tab through holes 110 in the positive electrode area and the negative electrode area at both ends of its length direction X, respectively, for passing the tab inside the battery through to the outside for folding, thereby electrically connecting the tab to the pole, saving space inside the battery, providing volume energy density, and facilitating welding and assembly, thereby improving product yield.

[0032] In some embodiments, the tab has a dimension C along the length direction X, and the tab through hole 110 has a dimension A along the length direction X, where C+3mm≤A≤C+30mm. In some embodiments, the tab through hole 110 has a dimension B along the width direction Y, where 3mm≤B≤30mm.

[0033] In the above embodiment, the dimensions of the tab through hole 110 in the length direction X and the width direction Y should be moderate. If it is too large, it is difficult to ensure the strength of the end plate. If it is too small, it will be difficult for the tab to pass through, making assembly more difficult and easily damaging the tab.

[0034] In some embodiments, the tab through hole 110 is rectangular or racetrack-shaped, and a chamfer is provided between two adjacent sides of the tab through hole 110 , wherein the chamfer is a rounded corner or a chamfered corner.

[0035] In this embodiment, the tab through hole 110 is in a racetrack shape or a chamfered rectangle, so that the edges are smoother and the generation of metal wires, burrs, etc. during processing is avoided, which may affect the tab.

[0036] In some embodiments, reference Figure 1 and Figure 2 The battery end plate 100 is provided with an explosion-proof valve hole 120 and a liquid injection hole 130 between the positive and negative electrode regions. In some embodiments, the positive and / or negative electrode regions have one tab through-hole 110, and the explosion-proof valve hole 120 is distributed along the length direction X. In some embodiments, the positive and / or negative electrode regions have two tab through-holes 110, and the explosion-proof valve holes 120 are distributed along the width direction Y. In some embodiments, a reinforcing rib 140 is provided within the explosion-proof valve hole 120, and the explosion-proof valve plate 150 is sealed to the explosion-proof valve hole 120. The explosion-proof valve plate 150 is spaced apart from the reinforcing rib 140 along the thickness direction Z.

[0037] In the above embodiment, the layout of the openings on the battery end plate 100 is more reasonable, making full use of the space. The reinforcing rib 140 is used to strengthen the strength of the explosion-proof valve hole 120, and the injection hole 130 is used to add electrolyte.

[0038] In a second aspect, the present application provides a single cell battery, which includes the battery end plate 100 of the first aspect. In a third aspect, the present application provides a battery pack, which includes the single cell battery of the second aspect.

[0039] In the above embodiments, the single cell of the second aspect and the battery pack of the third aspect both include the battery end plate 100 of the first aspect. Therefore, the single cell of the second aspect and the battery pack of the third aspect have at least all the technical effects of the battery end plate 100 of the first aspect, and their specific technical effects will not be repeated here.

[0040] The embodiments of the present application only illustrate the structures of the single cell of the second aspect and the battery pack of the third aspect that are related to the improvement points of the present application, but it does not mean that they do not have other structures. For example, the single cell also includes a battery shell covered by the battery end plate 100, and / or the battery pack also includes a battery frame that encapsulates multiple single cells, etc. Other structures will not be described one by one here.

[0041] In particular, the term "and / or" in this application should be understood as follows:

[0042] 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.

[0043] 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.

[0044] 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 a positive electrode region and a negative electrode region, which are respectively located at the two ends of the length direction of the battery end plate, and the positive electrode region and the negative electrode region are respectively provided with a tab through-hole, and the tab through-hole passes through the battery end plate along the thickness direction, and the tab through-hole is used for the tab to pass through from the inner side of the battery end plate to the outer side of the battery end plate.

2. The battery end plate according to claim 1, characterized in that: The dimension of the tab along the length direction is C, and the dimension of the tab through hole along the length direction is A, where C+3mm≤A≤C+30mm.

3. The battery end plate according to claim 1, characterized in that: The dimension of the tab through hole along the width direction is B, 3mm≤B≤30mm.

4. The battery end plate according to claim 1, characterized in that: The shape of the tab through hole is rectangular or racetrack-shaped, and a chamfer is provided between two adjacent sides of the tab through hole, and the chamfer is a rounded corner or a chamfered corner.

5. The battery end plate according to claim 1, characterized in that: The battery end plate is provided with an explosion-proof valve hole and a liquid injection hole between the positive electrode area and the negative electrode area.

6. The battery end plate according to claim 5, characterized in that: The positive electrode region and / or the negative electrode region has one tab through hole, and the explosion-proof valve holes are distributed along the length direction.

7. The battery end plate according to claim 5, characterized in that: The positive electrode region and / or the negative electrode region has two tab through holes, and the explosion-proof valve holes are distributed along the width direction.

8. The battery end plate according to any one of claims 5 to 7, characterized in that: A reinforcing rib is provided in the explosion-proof valve hole, and the explosion-proof valve hole cover is sealed with an explosion-proof valve plate, and the explosion-proof valve plate and the reinforcing rib are spaced apart in the thickness direction.

9. A single cell 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: The invention comprises the single cell battery according to claim 9.

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