CN217788713U - Battery unit, battery module, battery pack and vehicle - Google Patents

Battery unit, battery module, battery pack and vehicle Download PDF

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Publication number
CN217788713U
CN217788713U CN202220855327.7U CN202220855327U CN217788713U CN 217788713 U CN217788713 U CN 217788713U CN 202220855327 U CN202220855327 U CN 202220855327U CN 217788713 U CN217788713 U CN 217788713U
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battery
protrusion
connecting sheet
width
battery cell
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CN202220855327.7U
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Chinese (zh)
Inventor
朱燕
殷继炜
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BYD Co Ltd
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BYD Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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Abstract

The utility model discloses a battery unit, battery module, battery package and vehicle, battery unit include a plurality of batteries and a plurality of connection piece. The plurality of batteries are arranged side by side, two ends of the connecting sheet are electrically connected with the two batteries respectively, a protrusion is arranged on the connecting sheet, the protrusion is formed by outwards protruding one side surface in the thickness direction of the connecting sheet and inwards recessed the other side surface in the thickness direction, and the width of one end of the protrusion in the width direction of the connecting sheet in the length direction of the connecting sheet is smaller than the width of the other end of the protrusion in the width direction of the connecting sheet in the length direction of the connecting sheet. According to the utility model discloses a battery unit has bellied connection piece through the setting for the battery is when taking place the inflation, and deformation can take place for the arch of connection piece, has avoided tearing or the welding point inefficacy because of battery inflation leads to the connection piece, has guaranteed the reliability and the life of connection piece, thereby has guaranteed the electric connection reliability of connection piece and battery, has improved battery unit's reliability.

Description

Battery unit, battery module, battery pack and vehicle
Technical Field
The utility model belongs to the technical field of the battery technique and specifically relates to a battery cell, battery module, battery package and vehicle are related to.
Background
A battery module or a battery pack generally includes a plurality of batteries arranged side by side, and the batteries are electrically connected to each other by a connecting tab. The connecting sheet in the prior art can expand when the batteries are charged or discharged, so that the distance between welding points of two adjacent batteries is increased, the connecting sheet is likely to be torn or the welding points are invalid, the connection reliability of the connecting sheet and the batteries is reduced, and the service life of a battery module or a battery pack is shortened.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, an object of the present invention is to provide a battery unit, which has high reliability of electrical connection, high reliability of use, and long service life.
A second object of the present invention is to provide a battery module, including the above battery unit.
A third objective of the present invention is to provide a battery pack, including the above battery unit or the above battery module.
A fourth object of the present invention is to provide a vehicle, including the above battery pack.
According to the utility model discloses battery unit of first aspect embodiment, including a plurality of batteries and a plurality of connection piece. A plurality of batteries are arranged side by side; the two ends of the connecting sheet are respectively electrically connected with the two batteries, a bulge is arranged on the connecting sheet, the bulge is formed by outwards bulging one side surface of the connecting sheet in the thickness direction and inwards recessing the other side surface of the connecting sheet in the thickness direction, and the width of one end of the bulge in the width direction of the connecting sheet in the length direction of the connecting sheet is smaller than the width of the other end of the bulge in the width direction of the connecting sheet in the length direction of the connecting sheet.
According to the utility model discloses cell has bellied connection piece through the setting for the battery is when taking place the inflation, and deformation can take place for the arch of connection piece, has avoided leading to the connection piece to tear or the welding point inefficacy because of the battery inflation, thereby has guaranteed the connection reliability of connection piece and battery, and then has guaranteed cell's service reliability, has improved cell's life.
In some embodiments, the width of the one end of the projection in the width direction in the length direction of the connecting piece is L 1 The width of the other end of the protrusion along the width direction of the connecting sheet in the length direction of the connecting sheet is L 2 Each of the batteries has a thickness of L, and the other side surface of the connecting tab is recessed inward by a maximum distance of H, wherein L and L 1 、L 2 H satisfies: 0.4 XL ≤ 0.9X (L) 1 +H)，L 2 /L 1 ≥2。
In some embodiments, the L, L 1 Further satisfies the following conditions: 0.4 xL is less than or equal to 0.9 xL 1 。
In some embodiments, the L 1 、L 2 H and L respectively satisfy the following conditions: l is not more than 2mm 1 ≤32mm，0.5mm≤L 2 ≤14mm，2mm≤H≤8mm，21mm≤L≤75mm。
In some embodiments, the one end of the protrusion in the width direction of the connecting tab is located on a side of the connecting tab away from the center of the battery cell, and the other end of the protrusion in the width direction of the connecting tab is located on a side of the connecting tab adjacent to the center of the battery cell.
In some embodiments, both side edges of the protrusion extending in the width direction of the connecting piece extend obliquely with respect to the length direction of the connecting piece.
In some embodiments, each battery includes a pole, a connection hole is formed in each connection piece, the corresponding pole of the battery is connected with the connection hole, the side of the connection piece corresponding to the protruding end is a first side, the side of the connection piece corresponding to the protruding other end is a second side, and the distance between the center of the connection hole and the first side is less than or equal to the distance between the center of the connection hole and the second side. According to the utility model discloses battery module of second aspect embodiment, include according to the utility model discloses the battery unit of the above-mentioned first aspect embodiment.
According to the utility model discloses the battery package of third aspect embodiment, include according to the utility model discloses the battery unit of above-mentioned first aspect embodiment or according to the battery module of above-mentioned second aspect embodiment of the utility model.
According to the utility model discloses vehicle of fourth aspect embodiment, include according to the above-mentioned third aspect embodiment of the utility model battery package.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural view of a battery module according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a connecting sheet according to an embodiment of the present invention;
fig. 3 is a top view of a connecting piece according to an embodiment of the invention.
FIG. 4 is a front view of a connecting tab according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an embodiment of a battery pack, according to an embodiment of the present invention;
fig. 6 is a schematic diagram of another embodiment of a battery pack according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a vehicle according to an embodiment of the invention.
Reference numerals:
a battery cell 100;
a battery 10; a pole 11;
a connecting piece 20; a connection hole 21; a projection 22; a first side edge 23; a second side edge 24;
a battery module 200;
a battery pack 300;
a vehicle 400;
a first direction A; a second direction B; a third direction C.
Detailed Description
Embodiments of the present invention are described in detail below, and the embodiments described with reference to the drawings are exemplary. A battery module 200 according to an embodiment of the present invention is described below with reference to fig. 1 to 3, and includes a battery cell 100, the battery cell 100 including a plurality of batteries 10 and a plurality of tabs 20.
Specifically, as shown in fig. 1 and 2, a plurality of cells are arranged side by side, each cell 10 includes a pole post 11, both ends of a connecting tab 20 are electrically connected to two cells 10, respectively, a protrusion 22 is provided on the connecting tab 20, the protrusion 22 is formed by one side surface in the thickness direction of the connecting tab 20 protruding outward and the other side surface in the thickness direction recessed inward, and the width of one end of the protrusion 22 in the width direction of the connecting tab 20 in the length direction of the connecting tab 20 is smaller than the width of the other end of the protrusion 22 in the width direction of the connecting tab 20 in the length direction of the connecting tab 20.
In the present application, the longitudinal direction of the cell 10 and the width direction of the connecting tab 20 are both the first direction a shown in fig. 1 and 2, the thickness direction of the cell 10 and the longitudinal direction of the connecting tab 20 are both the second direction B shown in fig. 1 and 2, and the width direction of the cell 10 and the thickness direction of the connecting tab 20 are both the third direction C shown in fig. 1 and 2.
When the battery unit 100 is assembled, the plurality of cells 10 of the battery unit 100 may be sequentially arranged in the thickness direction of the cells 10, and each connecting tab 20 is connected between the poles 11 of two adjacent cells 10, whereby series connection and/or parallel connection of the plurality of cells 10 of the battery unit 100 may be achieved.
The occurrence of swelling of the battery 10 causes an increase in the size of the battery 10 in the thickness direction of the battery 10, so that the distance between the poles 11 of two adjacent batteries 10 becomes large. Through set up arch 22 on connection piece 20 in this application, arch 22 easily takes place deformation when battery 10 expands in the thickness direction, and protruding 22 deformation back, connection piece 20's length direction's size increases to connection piece 20 and battery 10's reliability of being connected has been guaranteed, thereby has guaranteed the reliability of the electricity connection of two adjacent batteries 10.
Battery 10 takes place the inflation and still can lead to battery 10 to increase at its ascending width of width direction for certain angle has between the utmost point post 11 of two adjacent batteries 10, connection piece 20 in this application is through setting up protruding 22, protruding 22 easily takes place the deformation when battery 10 expands in width direction, protruding 22 is after the deformation, connection piece 20's both ends can have certain angle, connection piece 20 and battery 10's reliability of being connected has been guaranteed, thereby the reliability of the electricity connection of two adjacent batteries 10 has been guaranteed.
According to the utility model discloses battery unit 100, connection piece 20 that has arch 22 through the setting, make battery 10 when taking place the inflation, connection piece 20's arch 22 can take place deformation, avoided leading to connection piece 20 to tear or the welding point inefficacy because of battery 10 inflation, can make the ascending surface in one or more directions of battery 10 when the inflation, connection piece 20 all can take place corresponding deformation, so that the atress of the welding department of connection piece 20 and connection piece 20 is alleviated, connection piece 20's reliability and life have been guaranteed, thereby connection piece 20 and battery 10's connection reliability has been guaranteed, and then guarantee battery unit 100's operational reliability, battery unit 100's life has been improved.
In some embodiments, referring to fig. 2, 3 and 4, the width of the one end of the projection 22 in the width direction in the length direction of the connecting piece 20 is L 1 The width of the other end of the projection 22 in the width direction in the longitudinal direction of the connecting piece 20 is L 2 Each of the cells 10 has a thickness L, and the other side surface of the connecting tab 20 is recessed inward by a maximum distance H, wherein L, L 1 、L 2 H satisfies: 0.4 XL ≤ 0.9X (L) 1 +H)，L 2 /L 1 Not less than 2. By such arrangement, the failure of the connecting sheet 20 due to stress concentration can be avoided, the connecting sheet 20 can be prevented from falling off, and the service life of the connecting sheet 20 is prolongedThe reliability of the connection piece 20 is improved.
Further, as shown in FIGS. 2 and 3, L 1 Further satisfies the following conditions: 0.4 xL is less than or equal to 0.9 xL 1 ，L 2 /L 1 Not less than 2. Therefore, the failure of the connecting sheet 20 can be further avoided, the service life of the connecting sheet 20 is prolonged, and the use reliability of the connecting sheet 20 is further improved.
In some embodiments, as shown in FIGS. 2-4, L 1 、L 2 H and L respectively satisfy the following conditions: l is not less than 2mm 1 ≤32mm，0.5mm≤L 2 Less than or equal to 14mm, less than or equal to 2mm, less than or equal to 8mm, less than or equal to 21mm, less than or equal to L, and less than or equal to 75mm. The deformation amount of the connecting sheet 20 thus set is minimized, the service life of the connecting sheet 20 is ensured, the reliability of the connecting sheet 20 is improved, and the electrical connection reliability of the battery cell 100 is improved.
In some embodiments, referring to fig. 1 and 2, one end of the protrusion 22 in the width direction of the connecting tab 20 is located on a side of the connecting tab 20 away from the center of the cell 100, and the other end of the protrusion 22 in the width direction of the connecting tab 20 is located on a side of the connecting tab 20 adjacent to the center of the cell 100.
When the battery 10 swells, the protruding height of the periphery of the top surface of the battery 10 is lower than the protruding height of the center of the top surface, so that the top surface of the battery 10 is deformed into an arc-shaped surface protruding out of the periphery of the top surface from the plane, and the pole 11 can be inclined. The utility model discloses an in the embodiment, the width of protruding 22 along the above-mentioned one end of the width direction of connection piece 20 is less, the width of protruding 22 along the above-mentioned other end of the width direction of connection piece 20 is great, can make the extension ability that is close to the one end at battery cell 100 center of protruding 22 stronger from this, make the top surface of battery 10 when taking place the inflation protruding 22 can follow the slope of utmost point post 11 and take place deformation, thereby reduce the influence of the inflation of battery 10 top surface to the welding point of connection piece 20, thereby avoid causing the electric connection failure of battery 10 because of welding failure, battery cell 100's reliability and life have been guaranteed.
Further, referring to fig. 2 and 3, both side edges of the projection 22 extending in the width direction of the connecting piece 20 extend obliquely with respect to the length direction of the connecting piece 20. Therefore, the protrusion 22 may be a trapezoid with two sides extending along the width direction of the connecting sheet 20 as waists and two ends extending along the length direction of the connecting sheet 20 as bases, for example, in the examples of fig. 2 and 3, the protrusion 22 is shaped as an isosceles trapezoid, and the protrusion 22 may deform along the sides of the protrusion 22 after the battery 10 expands, so as to further reduce the influence of the expansion of the top surface of the battery 10 on the welding point of the connecting sheet 20, thereby avoiding the electrical connection failure of the battery 10 caused by the welding failure, further ensuring the use reliability of the battery unit 100, and improving the service life of the battery unit 100.
In some embodiments, as shown in fig. 2 and 3, each connecting plate is formed with a connecting hole 21, the pole 11 of the corresponding battery 10 is connected to the connecting hole 21, one end of the connecting plate 20 is located at a side edge which is a first side edge 23, the other end of the connecting plate 20 is located at a side edge which is a second side edge 24, and the distance between the center of the connecting hole 21 and the first side edge 23 is smaller than or equal to the distance between the center of the connecting hole 21 and the second side edge 24. Alternatively, the connection hole 21 may be a through hole penetrating in the thickness direction of the connection plate 20, so as to facilitate connection of the connection plate 20 and the pole 11, and the processing is convenient.
After the connecting sheet 20 is disposed on the post 11 of the battery 10, the first side 23 is disposed on one side of the connecting sheet 20 far away from the center of the battery unit 100, the second side 24 is disposed on one side of the connecting sheet 20 near the center of the battery unit 100, because the top surface of the battery 10 is a cambered surface protruding from the center of the top surface, the more distant from the center of the top surface of the battery 10 is, the lower the protruding height is, the distance between the center of the connecting hole 21 and the first side 23 is set to be less than or equal to the distance between the center of the connecting hole 21 and the second side 24, so that the connecting hole 21 can be disposed away from the center of the top surface of the battery 10 in the length direction of the battery 10, thereby reducing the influence of the deformation of the top surface of the battery 10 on the reliability of the connecting hole 21 connected with the post 11, and further improving the reliability and service life of the battery unit 100.
In some embodiments, as shown in fig. 2, the tab 20 is integrally formed, and the protrusion 22 is formed by a portion of the tab 20 protruding away from the cell 10. Through setting up connection piece 20 to integrated into one piece for connection piece 20 is easily processed, has promoted connection piece 20's process velocity, is convenient for realize high-speed automated production, can reduce connection piece 20's manufacturing cost simultaneously.
In some embodiments, as shown in fig. 3, the connecting piece 20 is symmetrical about a center plane of the length direction of the connecting piece 20. By arranging the connecting sheets 20 in a symmetrical structure, the connecting sheets 20 are easy to position and process, high-speed automatic production of the connecting sheets 20 is facilitated, and meanwhile, when a plurality of connecting sheets 20 are connected with a plurality of batteries 10, the connecting sheets 20 positioned on the same side in the length direction of the plurality of batteries 10 can be positioned on the same straight line extending in the width direction of the batteries 10, so that assembly of the connecting sheets 20 can be facilitated, and the space utilization rate of the battery unit 100 can be improved.
According to the present invention, the battery module 200 includes the battery unit 100 according to the above first aspect of the present invention.
According to the utility model discloses battery module 200 through setting up the battery module 200 that has above-mentioned battery unit 100, can improve battery module 200's life.
According to the third aspect of the present invention, the battery pack 300 includes the battery unit 100 according to the first aspect of the present invention or the battery module 200 according to the second aspect of the present invention.
According to the battery pack 300 of the embodiment of the present invention, the battery unit 100 having the connecting sheet 20 is provided, so that the service life of the battery pack 300 can be prolonged.
According to the fourth aspect of the present invention, a vehicle 400 includes the battery pack 300 according to the third aspect of the present invention.
According to the utility model discloses vehicle 400 through setting up foretell battery package 300, has improved vehicle 400's wholeness ability.
In the description of the present invention, it is to be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention.
In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features. In the description of the present invention, "a plurality" means two or more. In the description of the present invention, the first feature "on" or "under" the second feature may include the first and second features being in direct contact, and may also include the first and second features being in contact with each other not directly but through another feature therebetween. In the description of the invention, the first feature being "on", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A battery cell, comprising:
a plurality of batteries arranged side by side;
the battery pack comprises a plurality of connecting pieces, wherein two ends of each connecting piece are respectively electrically connected with two batteries, a protrusion is arranged on each connecting piece, the protrusion is formed by outwards protruding one side surface of each connecting piece in the thickness direction and inwards recessing the other side surface of each connecting piece in the thickness direction, and the width of one end of each protrusion in the width direction of each connecting piece in the length direction of each connecting piece is smaller than the width of the other end of each protrusion in the width direction of each connecting piece in the length direction of each connecting piece.
2. The battery cell according to claim 1, wherein the one end in the width direction of the protrusion has a width L in the length direction of the connecting sheet 1 The width of the other end of the protrusion along the width direction of the connecting sheet in the length direction of the connecting sheet is L 2 Each of the cells has a thickness of L, and the other side surface of the connecting tab is recessed inward by a maximum distance of H, wherein L and L are 1 、L 2 H satisfies: 0.4 XL ≤ 0.9X (L) 1 +H)，L 2 /L 1 ≥2。
3. The battery cell of claim 2, wherein L, L 1 Further satisfies the following conditions: 0.4 xL is less than or equal to 0.9 xL 1 ，L 2 /L 1 ≥2。
4. The battery cell of claim 2, wherein L is 1 、L 2 H and L respectively satisfy: l is not less than 2mm 1 ≤32mm，0.5mm≤L 2 ≤14mm，2mm≤H≤8mm，21mm≤L≤75mm。
5. The battery cell according to claim 1, wherein the one end of the protrusion in the width direction of the connecting tab is located on a side of the connecting tab away from the center of the battery cell, and the other end of the protrusion in the width direction of the connecting tab is located on a side of the connecting tab adjacent to the center of the battery cell.
6. The battery cell according to claim 1, wherein both side edges of the protrusion extending in the width direction of the connecting sheet extend obliquely with respect to the length direction of the connecting sheet.
7. The battery unit according to any one of claims 1-6, wherein each of the batteries has a pole, each of the connecting pieces has a connecting hole formed therein, the pole of the corresponding battery is connected to the connecting hole,
the connecting sheet corresponds the protruding side that one end belongs to is the first side, the connecting sheet corresponds the protruding side that the other end belongs to is the second side, the center of connecting hole with distance between the first side is less than or equal to the center of connecting hole with distance between the second side.
8. A battery module characterized by comprising the battery cell according to any one of claims 1 to 7.
9. A battery pack, characterized by comprising the battery cell according to any one of claims 1 to 7 or the battery module according to claim 8.
10. A vehicle characterized by comprising the battery pack according to claim 9.
CN202220855327.7U 2022-04-13 2022-04-13 Battery unit, battery module, battery pack and vehicle Active CN217788713U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202220855327.7U CN217788713U (en) 2022-04-13 2022-04-13 Battery unit, battery module, battery pack and vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202220855327.7U CN217788713U (en) 2022-04-13 2022-04-13 Battery unit, battery module, battery pack and vehicle

Publications (1)

Publication Number Publication Date
CN217788713U true CN217788713U (en) 2022-11-11

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