Blade battery cell and battery pack

Abstract

The utility model provides a blade battery cell and a battery pack, and relates to the technical field of batteries. The blade battery cell comprises a shell, a pole and two cover plates, the shell comprises two openings which are opposite to each other in the length direction of the blade battery cell, and the two cover plates are arranged on the two openings respectively; the shell and the two cover plates define an accommodating cavity, each cover plate comprises a reference surface which is back to the accommodating cavity in the length direction, at least one cover plate comprises a sunken part, the sunken part is sunken towards the accommodating cavity from the reference surface, and the pole is arranged in the sunken part. When the blade battery core is installed in the box body, the pole column is arranged in the concave part, so that the pole column does not protrude any more. Therefore, the pole does not occupy extra space in the box body, 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 blade battery cell and a battery pack. Background Art

[0002] With the development of lithium-ion battery technology, blade cells have been widely used.

[0003] The blade cell includes a shell, two cover plates and two poles. The two cover plates are respectively arranged at the two ends of the shell in the length direction. The two poles are respectively provided on the two cover plates and protrude relative to the two cover plates. When the blade cell is installed into the battery pack box, the poles need to occupy additional internal space of the battery pack box, which reduces the effective space utilization of the box and affects the capacity of the battery pack. Utility Model Content

[0004] In view of this, the present application provides a battery cell and a battery pack to solve the problem that the pole needs to occupy additional internal space of the battery pack box, which reduces the effective space utilization of the box and affects the capacity of the battery pack.

[0005] According to one aspect of the present application, a blade cell is provided, comprising a housing, a pole, and two cover plates, wherein the housing comprises two openings opposite to each other in the length direction of the blade cell, and the two cover plates are respectively disposed on the two openings;

[0006] The shell and the two cover plates enclose an accommodating cavity, the cover plate includes a reference surface facing away from the accommodating cavity in the length direction, at least one of the cover plates includes a recessed portion, the recessed portion is recessed from the reference surface toward the accommodating cavity, and the pole is arranged in the recessed portion.

[0007] Preferably, the size of the blade battery cell in the length direction is 300mm-1200mm, the size of the blade battery cell in the width direction is 80mm-300mm, and the size of the blade battery cell in the thickness direction is 10mm-55mm.

[0008] Preferably, the number of the recessed portions is two, the number of the poles is two, and the two poles are respectively located in the two recessed portions.

[0009] Preferably, the two recessed portions are respectively recessed from the two reference surfaces in the two cover plates toward the accommodating cavity.

[0010] Preferably, the two recessed portions are recessed from the same reference surface toward the accommodating cavity, and the two recessed portions are spaced apart along the width direction of the blade battery core.

[0011] Preferably, the number of the recessed portion is one, the number of the poles is two, both of the poles are arranged in the recessed portion, and the two poles are spaced apart along the width direction.

[0012] Preferably, the ratio of the size of the recessed portion in the width direction to the size of the blade battery core in the length direction is 1 / 5-2 / 3.

[0013] Preferably, the ratio of the sum of the dimensions of the two recessed portions in the width direction to the dimension of the blade battery core in the length direction is 1 / 5-2 / 3.

[0014] According to another aspect of the present application, a battery pack is provided, comprising the above-mentioned blade 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 on the box, and the cover is arranged on the box.

[0016] The blade cell of the present application includes a shell, a pole and two cover plates. The shell includes two openings opposite to each other in the length direction of the blade cell, and the two cover plates are respectively arranged on the two openings; the shell and the two cover plates enclose a accommodating cavity, and the cover plate includes a reference surface facing away from the accommodating cavity in the length direction. At least one cover plate includes a recessed portion, which is recessed from the reference surface toward the accommodating cavity, and the pole is arranged in the recessed portion. When the blade cell is installed in the box, since the pole is arranged in the recessed portion, the pole no longer protrudes. In this way, the pole no longer occupies additional space in the box, the effective volume utilization of the box is improved, and the capacity of the battery pack is thereby increased. 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 blade battery cell according to a first embodiment of the present invention is shown;

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

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

[0021] Icon: 1-cover; 11-recessed portion; 2-pole; 3-shell; S1-reference plane; L1-length direction; L2-width 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 blade battery cell is provided, such as Figures 1 to 3As shown, the blade cell includes a shell 3, two poles 2 and two cover plates 1. The shell 3 includes two openings opposite to each other in the length direction L1 of the blade cell, and the two cover plates 1 are respectively arranged on the two openings; the shell 3 and the two cover plates 1 enclose a accommodating cavity, and the cover plate 1 includes a reference surface S1 facing away from the accommodating cavity in the length direction L1. At least one cover plate 1 includes a recessed portion 11, and the recessed portion 11 is recessed from the reference surface S1 toward the accommodating cavity, and the pole 2 is arranged in the recessed portion 11. When the blade cell is installed in the box, since the pole 2 is arranged in the recessed portion 11, the pole 2 no longer protrudes. In this way, the pole 2 no longer occupies additional space in the box, and 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 3 in the length direction L1 is 300 mm-1200 mm, the size of the shell 3 in the width direction L2 is 80 mm-300 mm, and the size of the shell 3 in the thickness direction L3 is 10 mm-55 mm.

[0033] Optionally, the size of the blade cell can be selected based on demand. For example, the size of the blade cell in the length direction L1 can be 330mm, 380mm, 400mm, 430mm, 500mm, 620mm, 730mm, 880mm, 940mm, 1000mm, 1100mm or 1200mm, etc.; the size of the blade cell in the width direction L2 can be 90mm, 120mm, 140mm, 190mm, 220mm or 250mm, etc., and the size of the blade cell in the thickness direction L3 can be 28mm, 38mm, 45mm, 56mm, 58mm, 62mm, 65mm, 74mm, 77mm, 80mm or 90mm, etc.

[0034] Preferably, the reference plane S1 is perpendicular to the longitudinal direction L1, and the recessed portion 11 is recessed from the reference plane S1 along the longitudinal direction L1 toward the accommodating cavity. The recessed portion 11 in the longitudinal direction L1 is larger than the dimension of the terminal 2 in the longitudinal direction L1 to ensure that the recessed portion 11 can accommodate the terminal 2 and that the terminal 2 does not protrude relative to the reference plane S1.

[0035] In addition, the number of poles 2 is two, one pole 2 serves as a positive pole, and the other pole 2 serves as a negative pole. The number of recessed portions 11 can be one or two, and the two poles 2 can be respectively arranged in two recessed portions 11 or in the same recessed portion 11. The two reference surfaces S1 can play a supporting role to protect the poles 2 from external pushing and squeezing pressure. A pole group connected to the pole 2 is provided in the accommodating cavity. The pole group can be composed of a stack of positive electrode sheets, negative electrode sheets and diaphragms. The shapes of the positive electrode sheets, negative electrode sheets and diaphragms can be adaptively adjusted based on the shape of the cover plate 1.

[0036] Optionally, the position and number of the recessed portions 11 can be selected based on actual needs. The blade battery cell of the present application will be described below in conjunction with the first, second and third embodiments.

[0037] Example 1

[0038] In this embodiment, if Figure 1 As shown, there are two recessed portions 11, each recessed from the two reference surfaces S1 along the length direction L1 toward the accommodating cavity. The two poles 2 are located in the two recessed portions 11, respectively. The recessed dimensions of the recessed portions 11 in the length direction L1 are larger than the dimensions of the poles 2 in the length direction L1, ensuring that the two poles 2 do not protrude relative to the two reference surfaces S1. The recessed portions 11 in the width direction L2 are larger than the dimensions of the poles 2 in the width direction L2, and the recessed portions 11 in the thickness direction L3 are larger than the dimensions of the poles 2 in the thickness direction L3, ensuring that the recessed portions 11 can accommodate the poles 2.

[0039] Optionally, the recessed portion 11 may be located in the middle or edge of the reference surface S1 in the width direction L2, and the positions of the two recessed portions 11 in the width direction L2 may completely overlap, partially overlap, or not overlap at all.

[0040] Preferably, the ratio of the size of the recessed portion 11 in the length direction L1 to the size of the housing 3 in the length direction L1 is 1 / 5-2 / 3.

[0041] Example 2

[0042] In this embodiment, if Figure 2 As shown, there is one recess 11, which is recessed from the reference surface S1 of one cover plate 1 along the length direction L1 toward the accommodating cavity. Two poles 2 are located in the same recess 11, and the two poles 2 are spaced apart along the width direction L2. The recessed dimension of the recess 11 in the length direction L1 is larger than the dimension of the poles 2 in the length direction L1, ensuring that the two poles 2 do not protrude relative to the reference surface S1. The dimension of the recess 11 in the width direction L2 is larger than the sum of the dimensions of the two poles 2 in the width direction L2. The dimension of the recess 11 in the thickness direction L3 is larger than the dimension of the poles 2 in the thickness direction L3, ensuring that the recess 11 can accommodate both poles 2.

[0043] Furthermore, the recessed portion 11 may be located at an end portion or a middle portion of the reference surface S1 in the width direction L2.

[0044] Preferably, the ratio of the size of the recessed portion 11 in the length direction L1 to the size of the housing 3 in the length direction L1 is 1 / 5-2 / 3.

[0045] Example 3

[0046] In this embodiment, if Figure 3 As shown, two recessed portions 11 are recessed from the same reference plane S1 along the length direction L1 toward the accommodating cavity. The two recessed portions 11 are spaced apart along the width direction L2. The recessed dimensions of the recessed portions 11 along the length direction L1 are larger than the dimensions of the pole 2 along the length direction L1, ensuring that the two poles 2 do not protrude relative to the two reference planes S1. The dimensions of the recessed portions 11 along the width direction L2 are larger than the dimensions of the pole 2 along the width direction L2. The dimensions of the recessed portions 11 along the thickness direction L3 are larger than the dimensions of the pole 2 along the thickness direction L3, ensuring that the recessed portions 11 can accommodate the pole 2.

[0047] Preferably, the two recessed portions 11 are respectively located at two ends of the reference plane S1 in the width direction L2.

[0048] Preferably, the ratio of the sum of the dimensions of the two recessed portions 11 in the length direction L1 to the dimension of the housing 3 in the length direction L1 is 1 / 5-2 / 3.

[0049] When the blade battery cell of the present application is installed in the box, the pole 2 no longer protrudes. In this way, the pole 2 no longer occupies additional space in the box, and there is no need to reserve a safety gap. The effective volume utilization of the box is improved, thereby increasing the capacity of the battery pack.

[0050] According to another aspect of the present application, a battery pack is provided, which includes the above-mentioned blade battery cell, and has the same technical effects as the above-mentioned blade battery cell, which will not be repeated here.

[0051] Furthermore, the battery pack includes multiple blade cells, which are stacked along the thickness direction L3. The battery pack also includes a liquid cooling plate, a box, and a cover. The box includes a panel and a bottom plate. The panel surrounds the bottom plate, and the bottom plate and the panel enclose a storage space within which the multiple blade cells are placed. The cover is mounted on the box, and the liquid cooling plate is located on the side of the bottom plate facing the cover. The blade cells support the liquid cooling plate and the cover to ensure the structural strength and stability of the battery pack.

[0052] 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 blade battery cell, characterized in that: The blade cell comprises a shell, a pole and two cover plates, the shell comprises two openings opposite to each other in the length direction of the blade cell, and the two cover plates are respectively arranged on the two openings; The shell and the two cover plates enclose an accommodating cavity, the cover plate includes a reference surface facing away from the accommodating cavity in the length direction, at least one of the cover plates includes a recessed portion, the recessed portion is recessed from the reference surface toward the accommodating cavity, and the pole is arranged in the recessed portion.

2. The blade battery cell according to claim 1, characterized in that: The size of the blade battery cell in the length direction is 300mm-1200mm, the size of the blade battery cell in the width direction is 80mm-300mm, and the size of the blade battery cell in the thickness direction is 10mm-55mm.

3. The blade battery cell according to claim 2, characterized in that: There are two recessed portions, and there are two poles, and the two poles are located in the two recessed portions respectively.

4. The blade battery cell according to claim 3, characterized in that: The two recessed portions are respectively recessed from the two reference surfaces of the two cover plates toward the accommodating cavity.

5. The blade battery cell according to claim 3, characterized in that: The two recessed portions are recessed from the same reference surface toward the accommodating cavity, and the two recessed portions are spaced apart along the width direction of the blade battery core.

6. The blade battery cell according to claim 2, characterized in that: The number of the recessed portion is one, the number of the poles is two, both of the poles are arranged in the recessed portion, and the two poles are spaced apart along the width direction.

7. The blade battery cell according to claim 4 or 6, characterized in that: The ratio of the size of the recessed portion in the width direction to the size of the blade battery core in the length direction is 1 / 5-2 / 3.

8. The blade battery cell according to claim 5, characterized in that: The ratio of the sum of the dimensions of the two recessed portions in the width direction to the dimension of the blade battery core in the length direction is 1 / 5-2 / 3.

9. A battery pack, characterized in that: The battery pack includes the blade battery cell according to any one of claims 1 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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