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, the shell comprises a bottom plate and a surrounding plate, the surrounding plate is arranged around the bottom plate, an opening is formed in the shell in a surrounding manner, and the cover plate is connected with the shell to seal the opening; the cover plate or the bottom plate is provided with a concave part which is concave towards the interior of the shell, and the pole is arranged in the concave 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 technical field of batteries, in particular to a square cell and a battery pack. BACKGROUND

[0002] With the development of lithium ion battery technology, square batteries have been widely used. The square cell includes a shell and a pole, and the pole protrudes relative to the shell. When arranging multiple square cells in the box of the battery pack, the multiple cells can be arranged in an upright or inverted manner, so that the poles of the multiple cells are all at the top or the bottom, and the poles of the multiple cells can be connected through busbars.

[0003] In order to prevent the battery pack from being deformed and affecting performance due to vibration or stepping, a safety gap needs to be reserved between the pole of the cell and the box. However, this safety gap and the pole will occupy the space in the box, reducing the effective volume utilization rate of the box, and further affecting the capacity of the battery pack. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the present application provides a cell and a battery pack to solve the problem that the pole of the cell needs to reserve a safety gap with the box when the existing square cell is installed in the box, the safety gap and the pole will occupy the space in the box, the effective volume utilization rate of the box is reduced, and further the capacity of the battery pack is affected.

[0005] According to an aspect of the present application, a square cell is provided, which includes a shell, a cover plate and a pole. The shell includes a bottom plate and a surrounding plate, the surrounding plate is arranged around the bottom plate, the shell surrounds an opening, and the cover plate is connected with the shell to close the opening.

[0006] A recessed portion recessed towards the inside of the shell is formed on the cover plate or the bottom plate, and the pole is arranged in the recessed portion.

[0007] The size of the shell in the length direction is 80-400mm, the size of the shell in the height direction is 50-300mm, and the size of the shell in the thickness direction is 10-100mm.

[0008] The cover plate includes a first plane facing away from the bottom plate, the recessed portion is recessed from the first plane towards the inside of the shell along the height direction, and the size of the recessed portion in the height direction is greater than the size of the pole in the height direction.

[0009] Alternatively, the bottom plate includes a second plane facing away from the cover plate, the recessed portion is recessed from the second plane towards the inside of the shell along the height direction, and the size of the recessed portion in the height direction is greater than the size of the pole in the height 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 length direction.

[0011] Preferably, the number of the recessed portions is two, and the two recessed portions are arranged at intervals along the length direction; the number of the poles is two, and the two poles are respectively arranged in the two recessed portions.

[0012] Preferably, the ratio of the size of the recessed portion in the length direction to the size of the shell in the length direction is 1 / 10-1 / 2.

[0013] Preferably, the ratio of the sum of the dimensions of the two recessed portions in the length direction to the dimension of the shell in the length direction is 1 / 10-1 / 2.

[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 includes a bottom plate and a surrounding plate. The surrounding plate is arranged around the bottom plate, the shell is surrounded by an opening, and the cover plate is connected to the shell to close the opening. A recessed portion that is recessed toward the inside of the shell is formed on the cover plate or the bottom plate, 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 there is no need to reserve a safety gap in the box. In this way, the pole 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. 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 structure diagram of a square-shaped battery cell according to an embodiment of the present application is shown in FIG. 1.

[0021] Figure 4 A structure diagram of a square-shaped battery cell according to an embodiment of the present application is shown in FIG. 1.

[0022] Icon: 1 - shell; 11 - bottom plate; 12 - coaming; 2 - cover plate; 3 - pole; 4 - recess; S1 - first plane; S2 - second plane; L1 - length direction; L2 - height direction; L3 - thickness direction. DETAILED DESCRIPTION

[0023] The following detailed description is presented to aid in understanding the method, apparatus and / or system described herein. It is not intended to limit the method, apparatus and / or system described herein to the details described. Rather, various changes, modifications and equivalents can be employed, once the disclosure of the application is understood. For example, the order of the operations described herein is merely an example and the operations can be carried out in a different order than described, except where the order of the operations is essential to the application. Also, descriptive features can be omitted in order to improve clarity and conciseness.

[0024] The features described herein can be implemented in different forms and should not be construed as limited to the examples described herein. Rather, these examples have been provided so that this disclosure will be thorough and complete, and will fully convey the scope of the methods, apparatus and / or systems described herein to those skilled in the art. Further, the described examples are to be considered in a sense relative to a number of possible ways of implementing the methods, apparatus and / or systems described herein, which will be apparent to those skilled in the art upon understanding the disclosure of the application.

[0025] Throughout the specification, when an element (such as a layer, region or substrate) is referred to as being "on" another element, "connected to" another element, "coupled to" another element, "adjacent to" another element, "on top of" another element, or "covering" another element, it can be directly on, connected to, coupled to, adjacent to, on top of, or covering the other element, or one or more other elements can be interposed therebetween. In contrast, when an element is referred to as being "directly on", "directly connected to", "directly coupled to", "directly adjacent to", "directly on top of", or "directly covering" another element, there are no other elements interposed therebetween.

[0026] As used herein, the term "and / or" includes any one of the listed items and any combination of any two or more of the listed items.

[0027] Although terms such as "first" and "second" and "third" can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, elements, components, regions, layers and / or sections described herein as being called a first element, component, region, layer or section can also be called a second element, component, region, layer or section, without departing from the teachings of the examples.

[0028] For ease of description, spatial terms such as "over," "upper," "under," and "lower" can be used with respect to the orientation of one element relative to another element as illustrated in the figures. Such spatial terms can be intended to encompass different orientations of the device in use or operation, in addition to the orientation depicted in the figures. For example, if the device in the figures were turned over, an element described as being "over" or "upper" relative to another element would then be oriented "under" or "lower" relative to the other element. Thus, the term "over" encompasses both an "over" and an "under" orientation depending upon the spatial orientation of the device. The device can be oriented in other ways (e.g., rotated 90 degrees or at other orientations) and an appropriate recitation of the spatial terms used herein will be made accordingly.

[0029] The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including" and "has" or "having" and the like are inclusive of the stated features, numbers, operations, components, elements, and / or the like, but do not exclude the presence or addition of one or more other features, numbers, operations, components, elements, and / or the like.

[0030] Variations in shapes depicted in the figures can occur as a result of manufacturing processes and / or tolerances. Thus, the examples described herein are not limited to the precise shapes shown in the figures, but include variations in shapes that occur as a result of manufacturing processes.

[0031] Features of the examples described herein can be combined with one another as would be apparent to one of ordinary skill in the art having the benefit of the present disclosure. Furthermore, although examples are described herein with various configurations, other configurations are possible in accordance with the present disclosure.

[0032] According to one aspect of the present application, a square battery cell is provided, which includes a shell 1, a cover plate 2 and a pole 3. The shell 1 includes a bottom plate 11 and a surrounding plate 12. The surrounding plate 12 is arranged around the bottom plate 11. The shell 1 is provided with an opening, and the cover plate 2 is connected to the shell 1 to close the opening. A recessed portion 4 is formed on the cover plate 2 or the bottom plate 11, which is recessed toward the inside of the shell 1, and the pole 3 is arranged in the recessed portion 4. When the square battery cell is installed in the box, since the pole 3 is arranged in the recessed portion 4, the pole 3 no longer protrudes, and there is no need to reserve a safety gap 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.

[0033] Furthermore, the size of the shell 1 in the length direction L1 is 80 mm-400 mm, the size of the shell 1 in the height direction L2 is 50 mm-300 mm, and the size of the shell 1 in the thickness direction L3 is 10 mm-100 mm.

[0034] Optionally, the size of the shell 1 can be selected based on demand. For example, the size of the shell 1 in the length direction L1 can be 80mm, 100mm, 120mm, 150mm, 180mm, 200mm, 210mm, 240mm, 250mm, 280mm, 290mm or 350mm, etc.; the size of the shell 1 in the height direction L2 can be 50mm, 55mm, 60mm, 63mm, 65mm, 67mm, 70mm, 75mm, 80mm, 100mm, 150mm, 180mm, 230mm or 270mm, etc., and the size of the shell 1 in the thickness direction L3 can be 15mm, 30mm, 40mm, 50mm, 57mm, 60mm, 63mm, 70mm, 80mm, 85mm or 93mm, etc.

[0035] Furthermore, the bottom plate 11 or the cover plate 2 can play a supporting role to protect the pole 3 from external pushing and squeezing pressure. The housing 1 is provided with a pole group connected to the pole 3. The pole group can be composed of a stack of positive electrode sheets, negative electrode sheets, and a separator. The shapes of the positive electrode sheets, negative electrode sheets, and separator can be adaptively adjusted based on the shape of the housing 1.

[0036] In addition, the cover plate 2 includes a first plane S1 facing away from the bottom plate 11 , and the bottom plate 11 includes a second plane S2 facing away from the cover plate 2 . The recessed portion 4 can be recessed from the first plane S1 or the second plane S2 toward the interior of the housing 1 .

[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 recesses 4 can be one or two, and one or two poles 3 can be disposed in each recess 4. The location of the poles 3 and the number and location of the recesses 4 can be selected as needed. The square battery cell of the present application will be described below in conjunction with Examples 1, 2, 3, and 4.

[0038] Example 1

[0039] In this embodiment, the number of poles 3 is two, and the number of recessed portions 4 is one. Figure 1 As shown, the recessed portion 4 is recessed from the first plane S1 along the height direction L2 toward the interior of the shell 1, and the recessed portion 4 is located in the middle of the first plane S1 in the length direction L1. The two poles 3 are both fixed on the cover plate 2, and the two poles 3 are both located in the recessed portion 4. The two poles 3 are arranged at intervals along the length direction L1.

[0040] Furthermore, the size of the recessed portion 4 in the length direction L1 is larger than the sum of the sizes of the two poles 3 in the length direction L1 , so as to ensure that the recessed portion 4 can accommodate the two poles 3 .

[0041] Preferably, the ratio of the size of the recessed portion 4 in the length direction L1 to the size of the housing 1 in the length direction L1 is 1 / 10-1 / 2.

[0042] Example 2

[0043] In this embodiment, the number of poles 3 is two, and the number of recessed portions 4 is one. Figure 2 As shown, the recessed portion 4 is located at the end of the first plane S1 in the length direction L1, and the recessed portion 4 is recessed from the first plane S1 along the height direction L2 toward the interior of the shell 1. The two poles 3 are both fixed on the cover plate 2, and the two poles 3 are both located in the recessed portion 4. The two poles 3 are arranged at intervals along the length direction L1.

[0044] Furthermore, the size of the recessed portion 4 in the length direction L1 is larger than the sum of the sizes of the two poles 3 in the length direction L1 , so as to ensure that the recessed portion 4 can accommodate the two poles 3 .

[0045] Preferably, the ratio of the size of the recessed portion 4 in the length direction L1 to the size of the housing 1 in the length direction L1 is 1 / 10-1 / 2.

[0046] Example 3

[0047] In this embodiment, there are two poles 3 and two recesses 4. Figure 3As shown, the recessed portion 4 is recessed from the first plane S1 along the height direction L2 toward the interior of the shell 1, and the two recessed portions 4 are both located in the middle of the first plane S1 in the length direction L1; the two poles 3 correspond to the two recessed portions 4 respectively, and the poles 3 are arranged in the corresponding recessed portions 4. The two poles 3 are both fixed on the cover plate 2.

[0048] Furthermore, the size of the recessed portion 4 in the length direction L1 is larger than the sum of the sizes of the pole 3 in the length direction L1 , so as to ensure that the accommodation space enclosed by the recessed portion 4 can accommodate the pole 3 .

[0049] Preferably, the ratio of the sum of the dimensions of the two recessed portions 4 in the length direction L1 to the dimension of the housing 1 in the length direction L1 is 1 / 10-1 / 2.

[0050] Example 4

[0051] In this embodiment, there are two poles 3 and two recesses 4. Figure 4 As shown, the recessed portion 4 is recessed from the first plane S1 along the height direction L2 toward the interior of the shell 1, and the two recessed portions 4 are located at both ends of the first plane S1 in the length direction L1. The two poles 3 correspond to the two recessed portions 4 respectively, and the poles 3 are arranged in the corresponding recessed portions 4. The two poles 3 are both fixed on the cover plate 2.

[0052] Furthermore, the size of the recessed portion 4 in the length direction L1 is larger than the sum of the sizes of the pole 3 in the length direction L1 , so as to ensure that the accommodation space enclosed by the recessed portion 4 can accommodate the pole 3 .

[0053] Preferably, the ratio of the sum of the dimensions of the two recessed portions 4 in the length direction L1 to the dimension of the housing 1 in the length direction L1 is 1 / 10-1 / 2.

[0054] Example 5

[0055] In this embodiment, there are two poles 3 and two recesses 4. The recesses 4 are recessed from the first plane S1 along the height direction L2 toward the interior of the housing 1. One recess 4 is located at the end of the first plane S1 in the length direction L1, and the other recess 4 is located in the middle of the first plane S1 in the length direction L1. The two poles 3 correspond to the two recesses 4 respectively, and the poles 3 are disposed in the corresponding recesses 4. Both poles 3 are fixed to the cover plate 2.

[0056] Furthermore, the size of the recessed portion 4 in the length direction L1 is larger than the sum of the sizes of the pole 3 in the length direction L1 , so as to ensure that the accommodation space enclosed by the recessed portion 4 can accommodate the pole 3 .

[0057] Preferably, the ratio of the sum of the dimensions of the two recessed portions 4 in the length direction L1 to the dimension of the housing 1 in the length direction L1 is 1 / 10-1 / 2.

[0058] Example 6

[0059] In this embodiment, there are two poles 3 and one recess 4. The recess 4 is recessed from the second plane S2 along the height direction L2 toward the interior of the housing 1. The recess 4 is located in the middle of the second plane S2 along the length direction L1. The two poles 3 are fixed to the base plate 11 and are both located in the recess 4. The two poles 3 are arranged at intervals along the length direction L1.

[0060] Furthermore, the size of the recessed portion 4 in the length direction L1 is larger than the sum of the sizes of the two poles 3 in the length direction L1 , so as to ensure that the recessed portion 4 can accommodate the two poles 3 .

[0061] Preferably, the ratio of the size of the recessed portion 4 in the length direction L1 to the size of the housing 1 in the length direction L1 is 1 / 10-1 / 2.

[0062] Example 7

[0063] In this embodiment, there are two poles 3 and one recess 4. The recess 4 is recessed from the second plane S2 along the height direction L2 toward the interior of the housing 1. The recess 4 is located at the end of the second plane S2 in the length direction L1. The two poles 3 are fixed to the base plate 11 and are both located in the recess 4. The two poles 3 are arranged at intervals along the length direction L1.

[0064] Furthermore, the size of the recessed portion 4 in the length direction L1 is larger than the sum of the sizes of the two poles 3 in the length direction L1 , so as to ensure that the recessed portion 4 can accommodate the two poles 3 .

[0065] Preferably, the ratio of the size of the recessed portion 4 in the length direction L1 to the size of the housing 1 in the length direction L1 is 1 / 10-1 / 2.

[0066] Example 8

[0067] In this embodiment, there are two poles 3 and two recesses 4. The recesses 4 are recessed from the second plane S2 along the height direction L2 toward the interior of the housing 1. Both recesses 4 are located in the middle of the second plane S2 along the length direction L1. The two poles 3 correspond to the two recesses 4 respectively, and the poles 3 are disposed in the corresponding recesses 4. Both poles 3 are fixed to the base plate 11.

[0068] Furthermore, the size of the recessed portion 4 in the length direction L1 is larger than the sum of the sizes of the pole 3 in the length direction L1 , so as to ensure that the accommodation space enclosed by the recessed portion 4 can accommodate the pole 3 .

[0069] Preferably, the ratio of the sum of the dimensions of the two recessed portions 4 in the length direction L1 to the dimension of the housing 1 in the length direction L1 is 1 / 10-1 / 2.

[0070] Embodiment 9

[0071] In this embodiment, there are two poles 3 and two recesses 4. The recesses 4 are recessed from the second plane S2 along the height direction L2 toward the interior of the housing 1. The two recesses 4 are located at both ends of the second plane S2 in the length direction L1. The two poles 3 correspond to the two recesses 4 respectively. The poles 3 are disposed in the corresponding recesses 4. Both poles 3 are fixed to the base plate 11.

[0072] Furthermore, the size of the recessed portion 4 in the length direction L1 is larger than the sum of the sizes of the pole 3 in the length direction L1 , so as to ensure that the accommodation space enclosed by the recessed portion 4 can accommodate the pole 3 .

[0073] Preferably, the ratio of the sum of the dimensions of the two recessed portions 4 in the length direction L1 to the dimension of the housing 1 in the length direction L1 is 1 / 10-1 / 2.

[0074] Example 10

[0075] In this embodiment, there are two poles 3 and two recesses 4. The recesses 4 are recessed from the second plane S2 along the height direction L2 toward the interior of the housing 1. One recess 4 is located at the end of the second plane S2 in the length direction L1, and the other recess 4 is located in the middle of the second plane S2 in the length direction L1. The two poles 3 correspond to the two recesses 4 respectively, and the poles 3 are disposed in the corresponding recesses 4. Both poles 3 are fixed to the base plate 11.

[0076] Furthermore, the size of the recessed portion 4 in the length direction L1 is larger than the sum of the sizes of the pole 3 in the length direction L1 , so as to ensure that the accommodation space enclosed by the recessed portion 4 can accommodate the pole 3 .

[0077] Preferably, the ratio of the sum of the dimensions of the two recessed portions 4 in the length direction L1 to the dimension of the housing 1 in the length direction L1 is 1 / 10-1 / 2.

[0078] 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.

[0079] 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.

[0080] Furthermore, the battery pack includes a plurality of square battery 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 side panels and end panels, the side panels surrounding the end panels, and the end panels and side panels enclose a placement space. The liquid cooling plate is bonded to the side of the end panel facing the placement space. The cover is attached to the box, and the plurality of square battery cells are disposed within the placement space. The plane where the recessed portion 4 is located can be bonded to the liquid cooling plate or the cover, so that the square battery cells can serve to support the cover or the liquid cooling plate.

[0081] 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 includes a bottom plate and a surrounding plate, the surrounding plate is arranged around the bottom plate, the shell is surrounded by an opening, and the cover plate is connected to the shell to close the opening; A recessed portion is formed on the cover plate or the bottom plate and is recessed toward the interior of the housing, and the pole is arranged in the recessed portion; The shell has a length dimension of 80 mm to 400 mm, a height dimension of 50 mm to 300 mm, and a thickness dimension of 10 mm to 100 mm. The cover plate includes a first plane facing away from the bottom plate, the recessed portion is recessed from the first plane along the height direction toward the interior of the housing, and the dimension of the recessed portion in the height direction is larger than the dimension of the pole in the height direction; Alternatively, the base plate includes a second plane facing away from the cover plate, the recessed portion is recessed from the second plane along the height direction toward the interior of the housing, and a dimension of the recessed portion in the height direction is greater than a dimension of the pole in the height direction.

2. The square battery cell according to claim 1, 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 length direction.

3. The square battery cell according to claim 1, characterized in that: There are two recessed portions, which are spaced apart along the length direction. There are two poles, which are respectively disposed in the two recessed portions.

4. The square battery cell according to claim 2, characterized in that: The ratio of the dimension of the recessed portion in the length direction to the dimension of the shell in the length direction is 1 / 10-1 / 2.

5. The square battery cell according to claim 3, characterized in that: The ratio of the sum of the dimensions of the two recessed portions in the length direction to the dimension of the shell in the length direction is 1 / 10-1 / 2.

6. A battery pack, characterized in that: The battery pack comprises the square battery cell according to any one of claims 1 to 5.

7. The battery pack according to claim 6, 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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