Single battery and battery pack

Abstract

The utility model provides a single battery and a battery pack, and relates to the technical field of batteries. The single battery comprises a battery cell, a shell with a first end plate, a second end plate and a side plate, a cover body connected with the first end plate, the second end plate and the side plate respectively, a terminal assembly penetrating through the first end plate, a current collecting piece electrically connected with one end, facing the first end plate, of the battery cell, and an adapter with a first adapter part and a second adapter part. The first end plate and the second end plate are oppositely arranged, the side plate is connected between the first end plate and the second end plate to define a containing cavity with an opening, the battery cell is contained in the containing cavity, the first switching part is connected with the second switching part, the first switching part is electrically connected with the terminal assembly, and the second switching part protrudes towards the direction of the battery cell and is electrically connected with the current collecting piece. According to the single battery provided by the invention, the opening is formed in the side surface of the shell, so that connection between the current collecting piece and the switching part is facilitated, the assembly difficulty is reduced, and the assembly efficiency is improved.

Description

Technical Field

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

[0002] In the related art, a single cell has a battery cell, a shell and a top cover assembly, and the battery cell and the terminal assembly on the top cover assembly are electrically connected through a current collecting plate with a bending structure. When assembling a single cell, the bending structure is first welded to the terminal assembly, and then the battery cell is placed in the shell through the opening of the shell end face, and then the bending structure is used to stagger the battery cell and the top cover assembly in the height direction of the single cell to reserve welding space between the current collecting plate and the battery cell, and then the current collecting plate is welded to the battery cell, and finally the bending structure is bent and placed inside the shell, and then the top cover assembly is sealed at the opening of the shell end face.

[0003] However, in the above assembly process, since sufficient welding space needs to be reserved between the current collecting plate and the battery cell, the length of the bending structure is often long. Therefore, after the bending structure is bent and placed inside the shell, it will occupy a larger space, thereby reducing the space utilization inside the shell, and further resulting in a lower energy density of the single battery. Utility Model Content

[0004] In view of this, the purpose of the present application is to provide a single cell and a battery pack, aiming to solve the technical problem in the related art that the battery cell enters the shell from the end face of the shell through a current collecting plate with a bending structure, resulting in low space utilization and low energy density.

[0005] To achieve the above objectives, the technical solutions adopted in this application are as follows:

[0006] In a first aspect, an embodiment of the present application provides a single cell having a first direction, wherein the single cell comprises:

[0007] Battery cells;

[0008] A housing, comprising a first end plate, a second end plate and a side plate, wherein the first end plate and the second end plate are arranged opposite to each other in the first direction, and the side plate is connected between the first end plate and the second end plate to define a receiving cavity, wherein the receiving cavity has an opening, and the battery cell is received in the receiving cavity;

[0009] A cover body, connected to the first end plate, the second end plate and the side plate respectively to cover the opening;

[0010] A terminal assembly is arranged through the first end plate;

[0011] A current collector, disposed in the accommodating cavity and electrically connected to one end of the battery cell facing the first end plate;

[0012] An adapter is arranged in the accommodating cavity, and the adapter includes a first adapter part and a second adapter part connected to each other, the first adapter part is electrically connected to the terminal assembly, and the second adapter part protrudes in the first direction toward the direction close to the battery cell and is electrically connected to the current collector.

[0013] In one of the embodiments of the first aspect, the current collecting part includes a first current collecting part and a second current collecting part that are connected, the first current collecting part is electrically connected to a side of the battery cell facing the first end plate, the second current collecting part and the second transition part are at least partially overlapped and electrically connected in the first direction, and the second transition part and the second current collecting part are folded and rolled toward one side of the terminal assembly away from the tail end of the first transition part.

[0014] In one embodiment of the first aspect, when the tail ends of the second adapter portion and the second current collecting portion away from the first adapter portion are in a flattened state, the tail ends of the second adapter portion and the second current collecting portion away from the first adapter portion both extend out of the opening.

[0015] In one embodiment of the first aspect, the single cell is a cylindrical battery, the side plate and the cover body are arc-shaped bent plates respectively, and the side plate and the cover body are covered to form a cylindrical structure, the first end plate is located on one side of the opening and is provided with a first step groove, the second end plate is located on one side of the opening and is provided with a second step groove, and the cover body is respectively clamped at the first step groove and the second step groove.

[0016] In one embodiment of the first aspect, the single cell further has a second direction perpendicular to the first direction, a depth of the first step groove and / or the second step groove in the first direction is H, a thickness of the first end plate and / or the second end plate is T1, satisfying: 0.2≤H / T1≤0.8.

[0017] In one embodiment of the first aspect, the single battery further has a second direction perpendicular to the first direction, the width of the first step groove and / or the second step groove in the second direction is W, the thickness of the cover is T2, and 0.7≤W / T2≤1.8.

[0018] In one embodiment of the first aspect, a first chamfer is provided on one side edge of the first end plate facing the second end plate, and a second chamfer is provided on one side edge of the second end plate facing the first end plate.

[0019] In one of the embodiments of the first aspect, a plurality of arc-shaped grooves are provided on a side of the second end plate facing away from the battery core, and two adjacent arc-shaped grooves are spaced apart from each other.

[0020] In one of the embodiments of the first aspect, the terminal assembly includes a conductive terminal, a pole, a first insulating member and a second insulating member, the first insulating member is connected to the first end plate and is located on a side of the first end plate away from the battery cell, the second insulating member is located between the battery cell and the first end plate, the pole is respectively passed through the second insulating member, the first end plate and the first insulating member, and is electrically connected to the adapter, and the conductive terminal is arranged on a side of the first insulating member away from the first end plate, and is electrically connected to the pole.

[0021] In one embodiment of the first aspect, the second insulating member includes a first insulating portion and a second insulating portion, the first insulating portion is located between the battery cell and the first end plate, the pole is passed through the first insulating portion, the second insulating portion is connected to the first insulating portion on a side facing the battery cell, and is arranged around the outer circumference of the current collector, and the second insulating portion is provided with an avoidance opening, which is connected to the open opening and is used to avoid the second adapter portion.

[0022] In a second aspect, an embodiment of the present application further provides a battery pack, comprising a single cell as described in any of the above embodiments.

[0023] The beneficial effects of this application are:

[0024] When assembling the single battery provided in the present application, the first adapter is first electrically connected to the terminal assembly, and the current collector is electrically connected to one end of the battery cell. Then, the battery cell and the current collector are placed together in the accommodating cavity of the shell, and then the second adapter is electrically connected to the current collector. Finally, the cover body is respectively connected to the first end plate, the second end plate and the side plate to cover the opening.

[0025] In this process, the side opening of the shell facilitates the connection between the second adapter and the current collector, reduces the difficulty of assembly, and improves assembly efficiency. At the same time, a "Z"-shaped adapter is used to replace the current collector with a folded structure. The second adapter of the adapter is protruding toward the direction of the battery cell, which has better fatigue resistance and mechanical properties, and increases the compressible space of the adapter in the shell. In this way, there is no need to reserve too much space in the shell to consider the folded space size of the bending structure, thereby improving the space utilization inside the shell, and then improving the energy density of the single battery.

[0026] In order to make the above-mentioned objects, features and advantages of the present application more obvious and understandable, preferred embodiments are given below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. 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 related drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of the three-dimensional structure of a single battery in some embodiments of the present application is shown;

[0029] Figure 2 Shows Figure 1 Schematic diagram of the cross-sectional structure at AA in the middle;

[0030] Figure 3 A schematic diagram of a three-dimensional exploded structure of a single battery in some embodiments of the present application is shown;

[0031] Figure 4 Shows Figure 3 The structural diagram of part B;

[0032] Figure 5 A schematic diagram of the three-dimensional structure of a single battery after the cover and the battery core are hidden in some embodiments of the present application is shown;

[0033] Figure 6 A schematic diagram of the structure of a single battery from one perspective after the cover and the battery core are hidden in some embodiments of the present application is shown;

[0034] Figure 7 Shows Figure 6 Schematic diagram of the structure of part C;

[0035] Figure 8 Shows Figure 6 The structural diagram of the D part;

[0036] Fig. 9 A structural schematic diagram of a second end plate from one perspective in some embodiments of the present application is shown.

[0037] Description of main component symbols:

[0038] 100-monocell; 110-cell; 120-housing; 121-first end plate; 1211-first step groove; 1212-first chamfer; 122-second end plate; 1221-second step groove; 1222-second chamfer; 1223-arc groove; 123-side plate; 1231-accommodation cavity; 1232-opening; 130-cover; 140-terminal assembly; 141-conductive terminal; 142 -pole; 143-first insulating member; 144-second insulating member; 1441-first insulating portion; 14411-vent; 1442-second insulating portion; 14421-avoidance; 150-current collecting member; 151-first current collecting portion; 152-second current collecting portion; 160-adapter; 161-first adaptor portion; 162-second adaptor portion; 170-explosion-proof valve; z-first direction; x-second direction. DETAILED DESCRIPTION

[0039] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0040] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0042] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0044] In the related art, a single cell has a battery cell, a shell and a top cover assembly, and the battery cell and the terminal assembly on the top cover assembly are electrically connected through a current collecting plate with a bending structure. When assembling the single cell, the bending structure is first welded to the terminal assembly, and then the battery cell is placed in the shell through the opening of the shell end face, and then the bending structure is used to stagger the battery cell and the top cover assembly in the height direction of the single cell to reserve welding space between the current collecting plate and the battery cell, and then the current collecting plate is welded to the battery cell, and finally the bending structure is bent and placed inside the shell, and then the top cover assembly is sealed at the opening of the shell end face.

[0045] However, in the above assembly process, since sufficient welding space between the collector plate and the battery cell needs to be reserved, the length of the bent structure is often long. Therefore, after the bent structure is bent and placed inside the shell, it will occupy a large space, thereby reducing the space utilization inside the shell, and further resulting in a low energy density of the single battery. At the same time, the method of inserting the battery cell into the shell from the end face of the shell has a small operating space and is difficult to operate, which reduces the assembly efficiency of the single battery.

[0046] like Figure 1 As shown, in order to solve the above-mentioned technical problems, an embodiment of the present application provides a single cell 100, which relates to the field of battery technology and is mainly used in battery packs. Of course, it can also be directly used in electric vehicles, energy storage power stations, ships, spacecraft and other electrical devices without taking the form of a battery pack.

[0047] like Figure 1 , Figure 3 and Figure 4As shown, the single battery 100 provided in this embodiment has a first direction z, and includes: a battery cell 110 , a shell 120 , a cover 130 , a terminal assembly 140 , a current collector 150 and a transition piece 160 .

[0048] The housing 120 includes a first end plate 121, a second end plate 122 and a side plate 123. The first end plate 121 and the second end plate 122 are arranged opposite to each other in the first direction z, and the side plate 123 is connected between the first end plate 121 and the second end plate 122 to define a receiving cavity 1231. The receiving cavity 1231 has an opening 1232, and the battery cell 110 is received in the receiving cavity 1231. The cover 130 is respectively connected to the first end plate 121, the second end plate 122 and the side plate 123 to cover the opening 1232. The terminal assembly 140 is arranged through the first end plate 121, and the current collector 150 is arranged in the receiving cavity 1231 and is electrically connected to one end of the battery cell 110 facing the first end plate 121.

[0049] The adapter 160 is disposed in the accommodating cavity 1231 , and includes a first adapter portion 161 and a second adapter portion 162 connected to each other. The first adapter portion 161 is electrically connected to the terminal assembly 140 , and the second adapter portion 162 protrudes in the first direction z toward the direction close to the battery cell 110 and is electrically connected to the current collector 150 .

[0050] It should be noted that the provision of the adapter 160 and the current collector 150 facilitates the electrical connection between the terminal assembly 140 and the battery cell 110 , so that the single battery 100 can realize the charge and discharge functions through the terminal assembly 140 .

[0051] In addition, the electrical connection mentioned above can be achieved by laser welding, or by snap-on connection, threaded connection, etc., and no specific limitation is imposed on the electrical connection method.

[0052] Illustratively, when assembling the single cell battery 100 provided in this embodiment, the first adapter portion 161 is first electrically connected to the terminal assembly 140, and the current collector 150 is electrically connected to one end of the battery cell 110. Then, the battery cell 110 and the current collector 150 are placed together in the accommodating cavity 1231 of the shell 120. Then, the second adapter portion 162 is electrically connected to the current collector 150. Finally, the cover body 130 is respectively connected to the first end plate 121, the second end plate 122 and the side plate 123 to cover the opening 1232.

[0053] In this process, the second adapter portion 162 and the current collecting member 150 are conveniently connected by means of the side opening of the shell 120, thereby reducing the difficulty of assembly and improving the assembly efficiency.

[0054] At the same time, a "Z"-shaped adapter 160 is used to replace the current collecting plate with a folded structure. The second adapter portion 162 of the adapter 160 is protruded toward the direction of the battery cell 110, and has excellent anti-fatigue mechanical properties. The compressible space of the adapter 160 in the shell 120 is increased. In this way, there is no need to reserve too much space in the shell 120 to consider the folding space size of the bending structure, thereby improving the space utilization inside the shell 120 and further improving the energy density of the single battery 100.

[0055] like Figure 3 and Figure 5 As shown, in one embodiment, the current collecting member 150 includes a first current collecting portion 151 and a second current collecting portion 152 connected to each other, the first current collecting portion 151 is electrically connected to the side of the battery cell 110 facing the first end plate 121, the second current collecting portion 152 and the second transition portion 162 are at least partially overlapped and electrically connected in the first direction z, and the tail ends of the second transition portion 162 and the second current collecting portion 152 away from the first transition portion 161 are folded and rolled toward one side of the terminal assembly 140. Moreover, when the tail ends of the second transition portion 162 and the second current collecting portion 152 away from the first transition portion 161 are flattened, the tail ends of both extend out of the opening 1232.

[0056] Exemplarily, when assembling the single battery 100 provided in this embodiment, the first adapter part 161 is first electrically connected to the terminal assembly 140, and the current collector 150 is electrically connected to one end of the battery cell 110, and then the battery cell 110 and the current collector 150 are placed together in the accommodating cavity 1231 of the shell 120. At this time, a portion of the second adapter part 162 and the second current collector 152 are exposed outside the opening 1232, and then the second adapter part 162 is electrically connected to the exposed portion of the second current collector 152, and the electrically connected portion is folded and rolled in a direction close to the terminal assembly 140, so that the second adapter part 162 and the second current collector 152 are completely accommodated in the accommodating cavity 1231, and finally the cover body 130 is respectively connected to the first end plate 121, the second end plate 122 and the side plate 123 to cover the opening 1232.

[0057] In this process, since the second adapter part 162 and the second collecting part 152 can be exposed outside the opening 1232, they can also be folded and rolled toward the terminal assembly 140, that is, the connection and fixation of the two are achieved by winding. This can well ensure the stability of the connection between the two, and the operation is simple without welding, thereby reducing the difficulty of assembly and improving the assembly efficiency of the single cell 100.

[0058] At the same time, after the second adapter portion 162 and the second current collecting portion 152 are folded and rolled, the occupation of the internal space of the shell 120 is reduced, making the internal space of the shell 120 more compact, thereby improving the energy density of the single battery 100.

[0059] like Figure 3 as well as Figures 6 to 8 As shown, in one embodiment, the single battery 100 is a cylindrical battery, and the side plate 123 and the cover body 130 are arc-shaped curved plates respectively, and the two are covered to form a cylindrical structure.

[0060] The first end plate 121 is provided with a first step groove 1211 on one side of the opening 1232 , and the second end plate 122 is provided with a second step groove 1221 on one side of the opening 1232 . The cover body 130 is respectively clamped at the first step groove 1211 and the second step groove 1221 .

[0061] Exemplarily, the side plate 123 and the cover body 130 are semi-cylindrical structures, or non-semi-cylindrical structures, as long as they form a cylindrical shape after being covered.

[0062] It can be understood that in the final stage of assembling the single cell 100, the cover body 130 can be snapped into the first step groove 1211 and the second step groove 1221, and then the cover body 130 can be sealed and connected to the first end plate 121, the second end plate 122 and the side plate 123 respectively by welding or other methods to complete the assembly of the single cell 100.

[0063] In this process, the first step groove 1211 and the second step groove 1221 are provided to position the cover body 130, thereby reducing the difficulty of subsequent sealing connection of the cover body 130 with the first end plate 121, the second end plate 122 and the side plate 123, thereby improving the assembly efficiency of the single cell 100.

[0064] like Figure 7 and Figure 8 As shown, further, the single cell 100 also has a second direction x perpendicular to the first direction z, the depth of the first step groove 1211 or the second step groove 1221 in the first direction z is H, or the depth of both in the first direction z is H, the thickness of the first end plate 121 or the second end plate 122 is T1, or the thickness of both is T1, satisfying: 0.2≤H / T1≤0.8.

[0065] Exemplarily, H / T1 may be any value selected from 0.2, 0.25, 0.3, 0.4, 0.45, 0.5, 0.56, 0.6, 0.7, 0.8, or any value in a range consisting of any two of them.

[0066] It should be noted that if H / T1 is too large, although the contact area between the cover 130 and the first end plate 121 and the second end plate 122 is large, the cover 130 can be more firmly clamped to the ground, but the structural strength of the first end plate 121 and the second end plate 122 will be reduced. If H / T1 is too small, although the structural strength of the first end plate 121 and the second end plate 122 is guaranteed, the contact area between the cover 130 and the first end plate 121 and the second end plate 122 is small, which will result in insufficient stability after the cover 130 is clamped with the first step groove 1211 and the second step groove 1221.

[0067] In this embodiment, by controlling H / T1 within the range of 0.2 to 0.8, the cover 130 can be firmly clamped at the first step groove 1211 and the second step groove 1221, so as to facilitate the subsequent sealing connection of the cover 130 with the first end plate 121, the second end plate 122 and the side plate 123. In addition, the first end plate 121 and the second end plate 122 can have sufficient structural strength.

[0068] like Figure 3 , Figure 7 and Figure 8 As shown, further, the single battery 100 also has a second direction x perpendicular to the first direction z, the width of the first step groove 1211 and / or the second step groove 1221 in the second direction x is W, the thickness of the cover 130 is T2, 0.7≤W / T2≤1.8.

[0069] Illustratively, any value among 0.7, 0.72, 0.8, 0.83, 0.85, 0.9, 1, 1.2, 1.4, 1.5, 1.8 or any value in the range consisting of any two of them can be selected.

[0070] It should be noted that if W / T2 is too large or too small, a higher step will be formed at the position where the cover body 130 is engaged with the first end plate 121 and the second end plate 122, thereby affecting the appearance of the single battery 100 and also affecting the quality of the subsequent welding seal of the cover body 130 with the first end plate 121 and the second end plate 122.

[0071] In this embodiment, by controlling W / T2 within the range of 0.7 to 1.8, the position where the cover 130 is engaged with the first end plate 121 and the second end plate 122 can be made relatively flat, thereby improving the aesthetics of the single cell 100 and improving the welding quality and increasing the firmness after welding.

[0072] like Figure 7 and Figure 8As shown, further, a first chamfer 1212 is provided on one side edge of the first end plate 121 facing the second end plate 122 , and a second chamfer 1222 is provided on one side edge of the second end plate 122 facing the first end plate 121 .

[0073] In this way, an assembly space is reserved for the cover body 130 , and the first chamfer 1212 and the second chamfer 1222 make it easier for the cover body 130 to be snapped into the first step groove 1211 and the second step groove 1221 , thereby reducing the assembly difficulty and improving the assembly efficiency of the single battery 100 .

[0074] like Fig. 9 As shown, in one embodiment, a plurality of arc-shaped grooves 1223 are disposed on a side of the second end plate 122 facing away from the battery cell 110 , and two adjacent arc-shaped grooves 1223 are disposed at intervals.

[0075] Exemplarily, the number of arc-shaped grooves 1223 can be two, and of course, can also be three, four, five, etc., which can be selected according to design requirements.

[0076] In this embodiment, the arc groove 1223 serves as a welding area, which is convenient for welding the second end plate 122 to the side of the battery cell 110 away from the terminal assembly 140, or for welding the second end plate 122 to the collecting plate, so that the second end plate 122 is electrically connected to the side of the battery cell 110 away from the terminal assembly 140 through the collecting plate. At this time, the terminal assembly 140 is the positive electrode of the single cell 100, and the second end plate 122 is the negative electrode of the single cell 100.

[0077] like Figure 2 and Figure 4 As shown, in one embodiment, the terminal assembly 140 includes: a conductive terminal 141 , a pole 142 , a first insulating member 143 and a second insulating member 144 .

[0078] Among them, the first insulating member 143 is connected to the first end plate 121 and is located on the side of the first end plate 121 away from the battery cell 110, the second insulating member 144 is located between the battery cell 110 and the first end plate 121, the pole 142 is respectively passed through the second insulating member 144, the first end plate 121 and the first insulating member 143, and is electrically connected to the adapter 160, and the conductive terminal 141 is arranged on the side of the first insulating member 143 away from the first end plate 121, and is electrically connected to the pole 142.

[0079] Exemplarily, the pole 142 may be electrically connected to the first adapter portion 161 . Of course, the pole 142 may also be electrically connected to the second adapter portion 162 .

[0080] In this embodiment, since the second adapter portion 162 protrudes in the first direction z away from the first adapter portion 161, and at the same time, the first insulating member 143 and the second insulating member 144 are respectively arranged on both sides of the first end plate 121, the possibility of contact between the battery cell 110 and the first end plate 121 can be reduced, thereby reducing the risk of short circuit.

[0081] like Figure 4 As shown, further, the second insulating member 144 includes a first insulating portion 1441 and a second insulating portion 1442, the first insulating portion 1441 is located between the battery cell 110 and the first end plate 121, the pole 142 is passed through the first insulating portion 1441, the second insulating portion 1442 is connected to the side of the first insulating portion 1441 facing the battery cell 110, and is arranged around the outer peripheral side of the collector 150, and the second insulating portion 1442 is provided with an avoidance opening 14421, which is connected to the open opening 1232 for avoiding the second adapter portion 162.

[0082] In this embodiment, since an avoidance opening 14421 is provided on the second insulating portion 1442, the avoidance opening 14421 is used to avoid the second adapter portion 162, thereby reducing the obstruction of the second insulating member 144 to the second adapter portion 162, thereby facilitating the electrical connection of the second adapter portion 162 with the current collecting member 150 through the position of the opening 1232 after the battery cell 110 is inserted into the shell.

[0083] like Figure 1 and Figure 4 As shown, further, the single cell 100 also includes an explosion-proof valve 170 arranged on the first end plate 121, and a through vent hole 14411 is arranged on the second insulating member 144, and the vent hole 14411 is arranged opposite to the explosion-proof valve 170. In this way, when the gas pressure inside the single cell 100 is too high, the gas will break through the explosion-proof valve 170 through the vent hole 14411, thereby releasing the gas pressure and improving the safety of the single cell 100.

[0084] In a second aspect, an embodiment of the present application provides a battery pack, comprising a single cell 100 in any of the above embodiments.

[0085] It is understandable that, since the battery pack provided in this embodiment has the single cell 100 in any of the above embodiments, it has all the beneficial effects of the single cell 100, which will not be described in detail here.

[0086] In order to better illustrate the beneficial effects brought by this embodiment, some embodiments are provided as follows for illustration, as shown in the following table:

[0087] Serial number H <![CDATA[T1]]> <![CDATA[H / T1]]> W <![CDATA[T2]]> <![CDATA[W / T2]]> Welding yield Example 1 0.2mm 2mm 0.1 0.6mm 0.5mm 1.2mm 99.50％ Example 2 0.4mm 2mm 0.2 0.6mm 0.5mm 1.2mm 100％ Example 3 0.8mm 2mm 0.4 0.6mm 0.5mm 1.2mm 100％ Example 4 1.2mm 2mm 0.6 0.6mm 0.5mm 1.2mm 100％ Example 5 1.6mm 2mm 0.8 0.6mm 0.5mm 1.2mm 100％ Example 6 1.8mm 2mm 0.9 0.6mm 0.5mm 1.2mm 99.30％ Example 7 0.8mm 2mm 0.4 0.7mm 0.6mm 1.17mm 100％ Example 8 0.8mm 2mm 0.4 0.5mm 0.85mm 0.59mm 99.40％ Example 9 0.8mm 2mm 0.4 0.5mm 0.7mm 0.71mm 100％ Example 10 0.8mm 2mm 0.4 0.6mm 0.6mm 1mm 100％ Embodiment 11 0.8mm 2mm 0.4 0.6mm 0.45mm 1.33mm 100％ Example 12 0.8mm 2mm 0.4 0.6mm 0.4mm 1.5mm 100％ Example 13 0.8mm 2mm 0.4 0.7mm 0.39mm 1.8mm 100％ Embodiment 14 0.8mm 2mm 0.4 0.7mm 0.37mm 1.89mm 99.60％

[0088] In the above table, 2000 single cells 100 are manufactured as test samples in each embodiment, and the welding yield is calculated. The welding yield mainly has the following two necessary indicators, and both of them meet the requirements to be qualified. Here, the yield requirement is ≥99.0%.

[0089] 1. Pre-assembly qualification rate: The cover 130 is pre-installed on the housing 120 and pre-welded to simply fix the cover 130. At this time, the gap and height difference between the two are detected by optical or laser equipment. The gap is required to be ≤0.07mm and the step height is ≤0.3mm.

[0090] 2. Welding strength: Weld the pre-assembled samples and inflate the inside of the special samples until the weld cracks and leaks. Record the air pressure at the time of cracking. If the air pressure is ≥2.6MPa, it meets the requirements.

[0091] It can be seen from the welding yield percentage in the above table that the test data of the test samples corresponding to all embodiments meet the requirements.

[0092] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0093] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A single cell battery, characterized in that: Having a first direction (z), the single battery comprises: Battery cell (110); A housing (120), comprising a first end plate (121), a second end plate (122) and a side plate (123), wherein the first end plate (121) and the second end plate (122) are arranged opposite to each other in the first direction (z), and the side plate (123) is connected between the first end plate (121) and the second end plate (122) to define a receiving cavity (1231), wherein the receiving cavity (1231) has an opening (1232), and the battery cell (110) is received in the receiving cavity (1231); A cover body (130) connected to the first end plate (121), the second end plate (122) and the side plate (123) respectively to cover the opening (1232); A terminal assembly (140) is disposed through the first end plate (121); A current collecting member (150) is disposed in the accommodating cavity (1231) and is electrically connected to one end of the battery cell (110) facing the first end plate (121); An adapter (160) is arranged in the accommodating cavity (1231), and the adapter (160) includes a first adapter portion (161) and a second adapter portion (162) connected to each other, the first adapter portion (161) is electrically connected to the terminal assembly (140), and the second adapter portion (162) protrudes in the first direction (z) toward the direction close to the battery cell (110) and is electrically connected to the current collector (150).

2. The single cell according to claim 1, characterized in that: The current collecting part (150) includes a first current collecting part (151) and a second current collecting part (152) which are connected, wherein the first current collecting part (151) is electrically connected to a side of the battery cell (110) facing the first end plate (121), the second current collecting part (152) and the second transition part (162) are at least partially overlapped and electrically connected in the first direction (z), and the second transition part (162) and the second current collecting part (152) are folded and rolled toward one side of the terminal assembly (140) away from the tail end of the first transition part (161).

3. The single cell according to claim 2, characterized in that: When the tail ends of the second adapter portion (162) and the second collecting portion (152) away from the first adapter portion (161) are in a flattened state, the tail ends of the second adapter portion (162) and the second collecting portion (152) away from the first adapter portion (161) both extend out of the opening (1232).

4. The single cell according to claim 1, characterized in that: The single cell is a cylindrical battery, the side plate (123) and the cover body (130) are arc-shaped bent plates respectively, and the side plate (123) and the cover body (130) are covered to form a cylindrical structure, the first end plate (121) is located on one side of the opening (1232) and is provided with a first step groove (1211), the second end plate (122) is located on one side of the opening (1232) and is provided with a second step groove (1221), and the cover body (130) is respectively clamped at the first step groove (1211) and the second step groove (1221).

5. The single cell according to claim 4, characterized in that: The single cell also has a second direction (x) perpendicular to the first direction (z), the depth of the first step groove (1211) and / or the second step groove (1221) in the first direction (z) is H, the thickness of the first end plate (121) and / or the second end plate (122) is T1, and satisfies: 0.2≤H / T1≤0.

8.

6. The single cell according to claim 4, characterized in that: The single cell also has a second direction (x) perpendicular to the first direction (z), the width of the first step groove (1211) and / or the second step groove (1221) in the second direction (x) is W, the thickness of the cover body (130) is T2, and 0.7≤W / T2≤1.

8.

7. The single cell according to claim 4, characterized in that: A first chamfer (1212) is provided on one side edge of the first end plate (121) facing the second end plate (122), and a second chamfer (1222) is provided on one side edge of the second end plate (122) facing the first end plate (121).

8. The single cell according to any one of claims 1 to 7, characterized in that: A plurality of arc-shaped grooves (1223) are arranged on a side of the second end plate (122) facing away from the battery core (110), and two adjacent arc-shaped grooves (1223) are arranged at intervals.

9. The single cell according to any one of claims 1 to 7, characterized in that: The terminal assembly (140) includes a conductive terminal (141), a pole (142), a first insulating member (143) and a second insulating member (144); the first insulating member (143) is connected to the first end plate (121) and is located on a side of the first end plate (121) away from the battery cell (110); the second insulating member (144) is located between the battery cell (110) and the first end plate (121); the pole (142) is respectively inserted through the second insulating member (144), the first end plate (121) and the first insulating member (143), and is electrically connected to the adapter (160); the conductive terminal (141) is arranged on a side of the first insulating member (143) away from the first end plate (121), and is electrically connected to the pole (142).

10. The single cell according to claim 9, characterized in that: The second insulating member (144) comprises a first insulating portion (1441) and a second insulating portion (1442), wherein the first insulating portion (1441) is located between the battery cell (110) and the first end plate (121), and the pole (142) is passed through the first insulating portion (1441). The second insulating portion (1442) is connected to the first insulating portion (1441) on the side facing the battery cell (110), and is arranged around the outer circumference of the current collector (150). The second insulating portion (1442) is provided with an avoidance opening (14421), and the avoidance opening (14421) is connected to the open opening (1232) for avoiding the second adapter portion (162).

11. A battery pack, characterized in that: A single cell comprising the single cell according to any one of claims 1 to 10.

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