Square battery cell and battery pack

Abstract

The utility model provides a square battery cell and a battery pack, and relates to the technical field of batteries. The square battery cell comprises a shell, a cover plate and a pole, an opening is formed in the shell in a surrounding manner, and the cover plate is connected with the shell so as to seal the opening; the shell comprises two first plates which are opposite to each other in the length direction, a sunken part which is sunken towards the interior of the shell is formed on at least one first plate, and the pole is arranged in the sunken part. When the square battery cell is mounted in the box body, the pole is arranged in the concave part, so that the pole does not protrude any more, and a safety gap does not need to be reserved in the box body. Therefore, the pole does not occupy extra space in the box body, a safety gap does not need to be reserved, the effective volume utilization rate of the box body is improved, and the capacity of the battery pack is further improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a square battery cell and a battery pack. Background Art

[0002] With the development of lithium-ion battery technology, prismatic batteries have become widely used. A prismatic cell consists of a housing and terminals. The terminals protrude from the housing. When multiple prismatic cells are arranged in a battery pack, they can be arranged upright or inverted, with the terminals facing either top or bottom. These terminals can be connected via busbars.

[0003] To prevent the battery pack from deformation due to vibration or being stepped on, which could affect performance, a safety gap must be left between the battery cell terminals and the box. However, this safety gap and the terminals take up space within the box, reducing the effective volume utilization of the box and, in turn, affecting the battery pack's capacity. Utility Model Content

[0004] In view of this, the present application provides a battery cell and a battery pack to solve the problem that when the existing square battery cell is installed in a box, a safety gap needs to be reserved between the battery cell pole and the box. The safety gap and the pole will occupy the space in the box, and the effective volume utilization of the box is reduced, which in turn affects the capacity of the battery pack.

[0005] According to one aspect of the present application, a square battery cell is provided, comprising a shell, a cover plate, and a pole, wherein the shell is provided with an opening, and the cover plate is connected to the shell to close the opening;

[0006] The housing includes two first plates facing each other in a length direction. A recessed portion recessed toward the interior of the housing is formed on at least one of the first plates, and the pole is disposed in the recessed portion.

[0007] Preferably, the size of the square battery core in the length direction is 80mm-400mm, the size of the square battery core in the height direction is 50mm-300mm, and the size of the square battery core in the thickness direction is 10mm-100mm.

[0008] Preferably, a dimension of the pole in the length direction is smaller than a dimension of the recessed portion relative to the first plate in the length direction.

[0009] Preferably, both ends of the recessed portion in the thickness direction are open, and a dimension of the pole in the thickness direction is smaller than a dimension of the recessed portion in the thickness direction.

[0010] Preferably, the number of the recessed portion is one, the number of the poles is two, and the two poles are arranged in the recessed portion at intervals along the height direction.

[0011] Preferably, the number of the recessed portions is two, the number of the poles is two, and the two poles are respectively arranged in the two recessed portions.

[0012] Preferably, the two recessed portions are recessed from the two first plates toward the interior of the housing, respectively.

[0013] Preferably, the size of the recessed portion in the height direction is 1 / 10-1 / 2 of the size of the square battery cell in the height direction.

[0014] According to another aspect of the present application, a battery pack is provided, comprising the above-mentioned square battery cell.

[0015] Preferably, the battery pack includes a cover, a box and a plurality of square battery cells, the plurality of square battery cells are stacked in the box, and the cover is arranged on the box.

[0016] The square battery cell of the present application includes a shell, a cover plate and a pole. The shell is provided with an opening, and the cover plate is connected to the shell to close the opening. The shell includes two first plates opposite to each other in the length direction, and at least one of the first plates is formed with a recessed portion that is recessed toward the interior of the shell, and the pole is arranged in the recessed portion. When the square battery cell is installed in the box, since the pole is arranged in the recessed portion, the pole no longer protrudes, and no safety gap is required to be reserved in the box. In this way, the pole no longer occupies additional space in the box, and no safety gap is required to be reserved. The effective volume utilization rate of the box is improved, thereby increasing the capacity of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic structural diagram of a square battery cell according to the first embodiment of the present invention is shown;

[0019] Figure 2 A schematic structural diagram of a square battery cell according to a second embodiment of the present invention is shown;

[0020] Figure 3 A schematic structural diagram of a square battery cell according to a third embodiment of the present invention is shown.

[0021] Icon: 1-shell; 11-bottom plate; 12-first plate; 121-recessed portion; 13-second plate; 2-cover plate; 3-pole; L1-length direction; L2-height direction; L3-thickness direction. DETAILED DESCRIPTION

[0022] The following detailed description is provided to help the reader gain a comprehensive understanding of the methods, devices, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent upon understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein. Rather, except for operations that must occur in a particular order, changes may be made that will be apparent upon understanding the disclosure of this application. Furthermore, descriptions of features known in the art may be omitted for clarity and brevity.

[0023] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many possible ways to implement the methods, devices, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0024] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, it may be directly “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on,” “directly connected to,” “directly coupled to,” “directly over,” or “directly covering” another element, there may be no other elements intervening therebetween.

[0025] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0026] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are used only to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Thus, a first member, component, region, layer, or portion in the examples described herein may also be referred to as a second member, component, region, layer, or portion without departing from the teachings of the examples.

[0027] For ease of description, spatial relational terms such as "above," "upper," "below," and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element would subsequently be "below" or "lower" relative to the other element. Thus, the term "above" includes both the orientations "above" and "below," depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0028] The terms used herein are intended only to describe various examples and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the singular is intended to include the plural. The terms "comprise," "include," and "have" list the presence of stated features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0029] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include changes in shapes that occur during manufacturing.

[0030] The features of the examples described herein can be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0031] According to one aspect of the present application, a square battery cell is provided, such as Figures 1 to 3As shown, the square battery cell includes a shell 1, a cover plate 2 and a pole 3. The shell 1 is provided with an opening, and the cover plate 2 is connected to the shell 1 to close the opening. The shell 1 includes two first plates 12 opposite to each other in the length direction L1. At least one of the first plates 12 is formed with a recessed portion 121 recessed toward the interior of the shell 1, and the pole 3 is arranged in the recessed portion 121. When the square battery cell is installed in the box, since the pole 3 is arranged in the recessed portion 121, the pole 3 no longer protrudes, and no safety gap is required to be reserved in the box. In this way, the pole 3 no longer occupies additional space in the box, and there is no need to reserve a safety gap. The effective volume utilization rate of the box is improved, thereby increasing the capacity of the battery pack.

[0032] Furthermore, the size of the shell 1 in the length direction L1 is 80mm-400mm, the size of the shell 1 in the height direction L2 is 50mm-300mm, the size of the shell 1 in the thickness direction L3 is 10mm-100mm, and the length direction L1, width direction and thickness direction L3 are perpendicular to each other.

[0033] Optionally, the size of the square battery cell can be selected based on demand. For example, the size of the square battery cell in the length direction L1 can be 80mm, 100mm, 130mm, 200mm, 240mm, 270mm, 290mm, mm, 300mm, 330mm, 360mm or 400mm, etc.; the size of the shell 1 in the height direction L2 can be 50mm, 80mm, 100mm, 120mm, 140mm, 200mm, 230mm, 280mm, mm, 290mm, 300mm, 340mm, 380mm or 400mm, etc., and the size of the shell 1 in the thickness direction L3 can be 10mm, 20mm, 25mm, 45mm, 65mm, 70mm, 73mm, mm, 80mm, 90mm or 100mm, etc.

[0034] Furthermore, the housing 1 also includes a bottom plate 11 and two second plates 13. The two first plates 12 and the two second plates 13 are alternately arranged. The two first plates 12 and the two second plates 13 are all connected to the bottom plate 11, and adjacent first plates 12 are connected to the second plates 13. The first plate 12 can play a supporting role to protect the pole 3 from external pushing and squeezing pressure. A pole group connected to the pole 3 is provided inside the housing 1. The pole group can be composed of a stack of positive electrode sheets, negative electrode sheets and a diaphragm. The shapes of the positive electrode sheets, negative electrode sheets and diaphragm can be adaptively adjusted based on the shape of the housing 1.

[0035] Preferably, the dimension of the terminal 3 in the length direction L1 is smaller than the dimension of the recess 121 relative to the first plate 12 in the length direction L1, to ensure that the terminal 3 does not protrude relative to the first plate 12. In this way, no safety gap is required in the box, thereby improving the effective volume utilization of the battery pack box.

[0036] Furthermore, the recessed portion 121 is open at both ends in the thickness direction L3, and the size of the pole 3 in the thickness direction L3 is smaller than the size of the recessed portion 121 in the thickness direction L3. Thus, the pole 3 is completely accommodated in the space enclosed by the recessed portion 121 without occupying any additional space.

[0037] Optionally, there are two poles 3, one of which serves as a positive pole and the other as a negative pole. The number of recessed portions 121 can be one or two, and one or two poles 3 can be disposed in each recessed portion 121. The location of the poles 3 and the number and location of the recessed portions 121 can be selected as needed. The square battery cell of the present application will be described below in conjunction with Embodiments 1, 2, and 3.

[0038] Example 1

[0039] In this embodiment, there are two poles 3 and two recessed portions 121. Figure 1 As shown, the two first plates 12 are each formed with a recessed portion 121 that is recessed toward the interior of the shell 1 along the length direction L1, and the two recessed portions 121 are respectively located in the middle of the two first plates 12 in the height direction L2; the two poles 3 correspond to the two recessed portions 121 respectively, and the poles 3 are arranged in the corresponding recessed portions 121.

[0040] Furthermore, the size of the recessed portion 121 in the height direction L2 is larger than the size of the pole 3 in the height direction L2, so as to ensure that the accommodation space enclosed by the recessed portion 121 can accommodate the pole 3.

[0041] Preferably, the ratio of the size of the recessed portion 121 in the height direction L2 to the size of the square battery cell in the height direction L2 is 1 / 10-1 / 2.

[0042] Optionally, the recessed portion 121 may also be located at the edge of the first plate 12 in the height direction L2. The plane perpendicular to the length direction L1 is defined as the reference plane. The projections of the two recessed portions 121 on the reference plane may completely overlap, partially overlap, or not overlap at all.

[0043] Furthermore, in a square battery cell in which only one first plate 12 is formed with the recessed portion 121 , the size of the square battery cell in the length direction L1 may be larger or smaller than the size of the square battery cell in the height direction L2 .

[0044] Example 2

[0045] In this embodiment, the number of poles 3 is two, and the number of recessed portions 121 is one. Figure 2 As shown, the size of the square battery cell in the length direction L1 is larger than the size of the square battery cell in the height direction L2. Only one first plate 12 is formed with a recessed portion 121 that is recessed toward the interior of the shell 1 along the length direction L1. Both poles 3 are arranged in the recessed portion 121, and the two poles 3 are arranged at intervals along the height direction L2.

[0046] Furthermore, the size of the recessed portion 121 in the height direction L2 is larger than the sum of the sizes of the two poles 3 in the height direction L2, so as to ensure that the accommodation space enclosed by the recessed portion 121 can accommodate the two poles 3.

[0047] Preferably, the ratio of the size of the recessed portion 121 in the height direction L2 to the size of the square battery cell in the height direction L2 is 1 / 10-1 / 2.

[0048] Optionally, the recessed portion 121 may be located at an edge or a middle portion of the first plate 12 in the height direction L2.

[0049] Example 3

[0050] In this embodiment, the size of the square battery cell in the length direction L1 is smaller than the size of the square battery cell in the height direction L2, the number of poles 3 is two, and the number of recessed portions 121 is two. Figure 3 As shown, the two first plates 12 are each formed with a recessed portion 121 that is recessed toward the interior of the shell 1 along the length direction L1, and the two recessed portions 121 are respectively located in the middle of the two first plates 12 in the height direction L2; the two poles 3 correspond to the two recessed portions 121 respectively, and the poles 3 are arranged in the corresponding recessed portions 121.

[0051] Furthermore, the size of the recessed portion 121 in the height direction L2 is larger than the size of the pole 3 in the height direction L2, so as to ensure that the accommodation space enclosed by the recessed portion 121 can completely accommodate the pole 3.

[0052] Preferably, the ratio of the size of the recessed portion 121 in the height direction L2 to the size of the square battery cell in the height direction L2 is 1 / 10-1 / 2.

[0053] Optionally, the recessed portion 121 may also be located at the edge of the first plate 12 in the height direction L2. The plane perpendicular to the length direction L1 is defined as the reference plane. The projections of the two recessed portions 121 on the reference plane may completely overlap, partially overlap, or not overlap at all.

[0054] When the square battery cell of the present application is installed in the box, the pole 3 no longer protrudes. In this way, the pole 3 no longer takes up extra space in the box, and there is no need to reserve a safety gap. The effective volume utilization rate of the box is improved, thereby increasing the capacity of the battery pack.

[0055] According to another aspect of the present application, a battery pack is provided, which includes the above-mentioned square battery cell, and has the same technical effects as the above-mentioned square battery cell, which will not be repeated here.

[0056] Furthermore, the battery pack includes a box body and a plurality of square battery cells. The plurality of square battery cells are stacked in the box body along the thickness direction L3. The first plate 12 can be attached to the inner wall of the box body.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A square battery cell, characterized in that: The square battery cell includes a shell, a cover plate and a pole, the shell is surrounded by an opening, and the cover plate is connected to the shell to close the opening; The housing includes two first plates facing each other in a length direction. A recessed portion recessed toward the interior of the housing is formed on at least one of the first plates, and the pole is disposed in the recessed portion.

2. The square battery cell according to claim 1, characterized in that: The size of the square battery core in the length direction is 80mm-400mm, the size of the square battery core in the height direction is 50mm-300mm, and the size of the square battery core in the thickness direction is 10mm-100mm.

3. The square battery cell according to claim 2, characterized in that: The dimension of the pole in the longitudinal direction is smaller than the dimension of the recessed portion that is recessed relative to the first plate in the longitudinal direction.

4. The square battery cell according to claim 2, characterized in that: Both ends of the recessed portion in the thickness direction are open, and a dimension of the pole in the thickness direction is smaller than a dimension of the recessed portion in the thickness direction.

5. The square battery cell according to claim 4, characterized in that: The number of the recessed portion is one, the number of the poles is two, and the two poles are arranged in the recessed portion at intervals along the height direction.

6. The square battery cell according to claim 4, characterized in that: There are two recessed portions, and there are two poles, and the two poles are respectively arranged in the two recessed portions.

7. The square battery cell according to claim 6, characterized in that: The two recessed portions are respectively recessed from the two first plates toward the interior of the housing.

8. The square battery cell according to any one of claims 2 to 7, characterized in that: The size of the recessed portion in the height direction is 1 / 10-1 / 2 of the size of the square battery cell in the height direction.

9. A battery pack, characterized in that: The battery pack includes the square battery cell according to any one of claims 2 to 8.

10. The battery pack according to claim 9, characterized in that: The battery pack includes a cover, a box, and a plurality of square battery cells. The plurality of square battery cells are stacked in the box, and the cover is arranged on the box.

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