CN115663363B - Battery end cover assembly, energy storage device and electric equipment - Google Patents

Battery end cover assembly, energy storage device and electric equipment Download PDF

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Publication number
CN115663363B
CN115663363B CN202211412097.8A CN202211412097A CN115663363B CN 115663363 B CN115663363 B CN 115663363B CN 202211412097 A CN202211412097 A CN 202211412097A CN 115663363 B CN115663363 B CN 115663363B
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China
Prior art keywords
equal
less
insulating plate
end cap
tab
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CN202211412097.8A
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Chinese (zh)
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CN115663363A (en
Inventor
黄汉川
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Xiamen Hithium Energy Storage Technology Co Ltd
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Xiamen Hithium Energy Storage Technology Co Ltd
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Priority to CN202211412097.8A priority Critical patent/CN115663363B/en
Priority to PCT/CN2022/142024 priority patent/WO2024098528A1/en
Publication of CN115663363A publication Critical patent/CN115663363A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • 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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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Gas Exhaust Devices For Batteries (AREA)

Abstract

The invention discloses a battery end cover assembly, an energy storage device and electric equipment, wherein the battery end cover assembly comprises: an end cover, an insulating plate and two switching pieces. Wherein, the insulation board includes: the insulation plate comprises an insulation plate main body, two first flanges and two second flanges, wherein the two first flanges are connected to two opposite sides of the insulation plate main body, the two second flanges are connected to the other two opposite sides of the insulation plate main body, and the first flanges and the second flanges protrude towards one side far away from the end cover relative to the insulation plate main body; the minimum distance from the edge of each rotating sheet to the inner edges of the two first flanges is D1 and D1', D1 is more than or equal to 0.05 and less than or equal to 300mm, and D1' is more than or equal to 0.05 and less than or equal to 300mm; the minimum distance from the edge of each rotating sheet to the inner edge of the adjacent second flange is D2, and D2 is more than or equal to 0.05 and less than or equal to 10mm. The battery end cover assembly can guarantee corresponding setting of the switching piece and the lug, meanwhile, defective proportion of the battery end cover assembly is reduced, and safety of a battery is improved.

Description

Battery end cover assembly, energy storage device and electric equipment
Technical Field
The application relates to the technical field of batteries, in particular to a battery end cover assembly, an energy storage device and electric equipment.
Background
In the structure of the battery, the adapter piece is arranged on an insulating plate of the battery and is used for electrically connecting the pole post and the pole lug. When the adapter piece is required to be arranged on different end covers, a large amount of time and resources are required to verify the arrangement position range of the adapter piece, so that the resources are wasted, and the input cost of products is increased.
In addition, the connection position range of the switching piece is set according to experience, so that the setting position deviation of the switching piece is easy to exist, and the proportion of assembly defective products in product production is improved. And when the position of the switching piece is offset, short circuit can occur in the battery, and the safety of the battery is affected.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides the battery end cover assembly, the adapter piece of the battery end cover assembly can ensure the corresponding arrangement of the adapter piece and the lug, meanwhile, the defective proportion of the battery end cover assembly is reduced, and the safety of the battery is improved.
The application further provides an energy storage device adopting the battery end cover assembly.
The application also provides electric equipment adopting the energy storage device.
According to an embodiment of the invention, a battery end cap assembly includes: an end cap; the insulating plate is connected to one side of the end cover; the two adapter pieces are arranged on one side, far away from the end cover, of the insulating plate, and are arranged at intervals along the length direction of the end cover; wherein, the insulation board includes: the insulation board comprises an insulation board main body, two first flanges and two second flanges, wherein the two first flanges are connected to two opposite sides of the insulation board main body, the two second flanges are connected to two opposite sides of the insulation board main body, and the first flanges and the second flanges protrude towards one side far away from the end cover relative to the insulation board main body; the minimum distance from the edge of each rotating sheet to the inner edges of the two first flanges is D1 and D1', wherein D1 is more than or equal to 0.05 and less than or equal to 300mm, and D1' is more than or equal to 0.05 and less than or equal to 300mm; the minimum distance from the edge of each rotating sheet to the inner edge of the adjacent second flange is D2, and D2 is more than or equal to 0.05 and less than or equal to 10mm.
According to the battery end cover assembly provided by the embodiment of the invention, the arrangement position of the switching sheet on the insulating plate has a larger adjustable range, the corresponding arrangement of the switching sheet and the lug can be ensured, the condition of poor contact between the switching sheet and the lug is reduced or avoided in the assembly of the battery end cover assembly, and the defective proportion of the battery end cover assembly is reduced. Meanwhile, after the switching pieces are connected to the insulating plate, the setting positions of the switching pieces are not easy to deviate, and enough gaps are reserved between the two switching pieces, so that the risk of short circuit between lugs or between the switching pieces caused by deviation of the switching pieces is reduced or avoided, and the safety of the battery is improved.
In some embodiments, the adapter tab includes a post weld region having a dimension L1 along a width of the end cap and a dimension L2 along a length of the end cap; the minimum distances from the edge of the pole welding area to the inner edges of the two first flanges are W1 and W1', W1 is less than or equal to 2 and less than or equal to 10 and less than or equal to 1 and less than or equal to 2 and less than or equal to 1 and less than or equal to 10 and less than or equal to 1; the minimum distance from the edge of the pole welding area to the inner edge of the adjacent second flange is W2, and W2 is more than or equal to 2 and less than or equal to 10 and L2. Therefore, the setting position of the switching piece on the insulating plate is convenient to adjust, the switching piece and the pole column can be guaranteed to have good connection effect, and the switching piece is not easy to deform.
In some embodiments, the adapter piece comprises two tab welding areas, wherein the dimension of the tab welding areas along the width direction of the end cover is L3, and the dimension of the tab welding areas along the length direction of the end cover is L4; the minimum distance from the edge of the tab welding area to the inner edge of the adjacent first flange is W3, and W3 is more than or equal to 0.3 and less than or equal to 2 and L3; the minimum distance from the edge of the tab welding area to the inner edge of the adjacent second flange is W4, and L4 is less than or equal to W4 and less than or equal to 4L 4. Therefore, the connection of the tab on the switching piece is convenient, and the contact stability of the tab and the switching piece is improved.
In some embodiments, the patch has a thickness h1; the thickness of the part of the first flange protruding out of the main body of the insulating plate is h2, and h1 is 1.3 times h2 is less than or equal to 8 times h1; the thickness of the second flange protruding out of the main body part of the insulating plate is h3, and h1 is more than or equal to 2 and less than or equal to h3 and less than or equal to 10 h1. Therefore, the tab is connected stably on the switching piece, and the energy density of the battery is improved under the condition of limited battery volume.
In some embodiments, the battery end cap assembly further comprises: an explosion-proof valve arranged in the center of the cover plate; the minimum distances from the edges of the two rotating sheets to the edge of the explosion-proof valve are D3 and D4, D3 is more than or equal to 0.1 and less than or equal to 30mm, and D4 is more than or equal to 0.1 and less than or equal to 30mm. From this, two switching pieces are separated in the both sides of explosion-proof valve, and two switching pieces are all greater than 0.1mm apart from the distance (D3 and D4) of explosion-proof valve, can avoid the switching piece to form the jam to the explosion-proof valve, prevent simultaneously that two switching pieces from contacting and leading to the short circuit.
Further, the insulating plate is an integrated plate, the two adapter plates are symmetrically arranged on the insulating plate relative to the explosion-proof valve, so that the processing of the insulating plate can be facilitated, the setting operation of the insulating plate on the end cover is simplified, and meanwhile, the weight balance of the battery end cover assembly on two sides of the explosion-proof valve is facilitated.
In some embodiments, the insulating plate comprises: the positive insulating plate and the negative insulating plate are arranged at intervals along the length direction of the cover plate, and the two adapter plates are respectively connected to the positive insulating plate and the negative insulating plate. From this, two switching pieces are encircleed by anodal insulation board and negative pole insulation board respectively, and the explosion-proof valve can be located between anodal insulation board and the negative pole insulation board to can avoid the switching piece to form the jam to the explosion-proof valve, prevent simultaneously that two switching pieces from contacting and leading to the short circuit.
Further, the positive insulating plate and the negative insulating plate are symmetrically arranged relative to the explosion-proof valve, and the two adapter plates are symmetrically arranged relative to the explosion-proof valve. Therefore, the shapes and the weights of the positive insulating plate and the negative insulating plate are consistent, and the shapes and the weights of the two switching pieces are consistent, so that the weights of the battery end cover assemblies on two opposite sides of the explosion-proof valve are relatively even, and the stability of the battery end cover assemblies arranged on a battery can be improved.
In some embodiments, when two tab welding areas are provided on the rotating sheet, the dimension of the tab welding areas along the length direction of the end cover is L4; the minimum distances from the edges of the two lug welding areas to the edge of the explosion-proof valve are W5 and W6 respectively, wherein W4 is less than or equal to W5 and less than or equal to 5 and L4 is less than or equal to W6 and less than or equal to 5 and L4.
In some embodiments, the insulating plate is provided with a limiting portion corresponding to the adapter plate. Therefore, the welding and fixing effect of the tab and the switching piece can be improved while the function of the explosion-proof valve is not affected.
According to an embodiment of the present invention, an energy storage device includes: a battery end cap assembly according to any of the preceding claims.
According to the energy storage device provided by the embodiment of the invention, through the adoption of the battery end cover assembly provided by the embodiment, the corresponding arrangement of the switching piece and the lug can be ensured, the condition of poor contact between the switching piece and the lug is reduced or avoided in the assembly of the battery end cover assembly, and the defective proportion of the battery end cover assembly is reduced. Meanwhile, the risk of short circuit in the energy storage device can be reduced or avoided, and the safety of the energy storage device is improved.
The electric equipment comprises the energy storage device.
According to the electric equipment provided by the embodiment of the invention, the energy storage device can reduce or avoid the risk of short circuit in the electric equipment, and the safety of the electric equipment is improved.
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 foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is a front view of a battery end cap assembly according to a first embodiment of the present invention;
FIG. 2 is a schematic illustration of the location of the post weld area of the battery end cap assembly of the embodiment of FIG. 1;
FIG. 3 is a schematic illustration of the location of tab lands of the battery end cap assembly of the embodiment of FIG. 1;
FIG. 4 is a side view of the battery end cap assembly of the embodiment of FIG. 1;
fig. 5 is a front view of a battery end cap assembly according to a second embodiment of the present invention;
FIG. 6 is a side view of the battery end cap assembly of the embodiment of FIG. 5;
fig. 7 is a front view of a battery end cap assembly according to a third embodiment of the present invention.
Reference numerals:
battery end cap assembly 100,
End cap 10,
Insulating plate 11, positive insulating plate 11a, negative insulating plate 11b, insulating plate main body 111, first flange 112, second flange 113,
A switching piece 12, a pole welding area 121, a pole lug welding area 122,
An explosion-proof valve 13 and a protective cover 14.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "center," "length," "width," "thickness," "upper," "inner," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
A battery end cap assembly 100, an energy storage device, and a powered device according to an embodiment of the present invention are described below with reference to the accompanying drawings.
As shown in fig. 1, a battery end cap assembly 100 according to an embodiment of the present invention includes: an end cap 10, an insulating plate 11 and two adapter plates 12. The insulation board 11 is connected in end cover 10 one side, and two changeover pieces 12 set up in the side of keeping away from end cover 10 of insulation board 11, and two changeover pieces 12 are along the length direction interval setting of end cover 10.
Wherein the insulating plate 11 includes: the insulating plate comprises an insulating plate main body 111, two first flanges 112 and two second flanges 113, wherein the two first flanges 112 are connected to two opposite sides of the insulating plate main body 111, the two second flanges 113 are connected to two opposite sides of the insulating plate main body 111, and the first flanges 112 and the second flanges 113 protrude towards one side, far away from the end cover 10, of the insulating plate main body 111.
It will be appreciated that the insulating plate 11 serves to separate the tabs inside the battery from the cover plate, preventing the tabs from making electrical contact with the end cap 10 to cause internal shorting of the battery, and therefore, the projection of the tabs inside the battery onto the end cap 10 is located within the insulating plate 11.
Under such a structure, the two switching pieces 12 are arranged in the area surrounded by the first flange 112 and the second flange 113, namely, the projections of the two switching pieces 12 on the end cover 10 are all located in the insulating plate 11, so that the switching pieces 12 can correspond to the lugs, and the switching pieces 12 and the lugs are not easy to contact the end cover 10, thereby reducing the internal short circuit of the battery and improving the safety of the battery. While the first flange 112 and the second flange 113 are disposed along four edges of the insulating plate body 111, the first flange 112 and the second flange 113 may also serve as a reference frame for defining the disposition position of the rotation tab 12 on the insulating plate 11.
In the present application, the minimum distances from the edge of each of the turning pieces 12 to the inner edges of the two first flanges 112 are D1 and D1', respectively, 0.05.ltoreq.D1.ltoreq.300 mm and 0.05.ltoreq.D1'. Ltoreq.300 mm.
In the connection between the tab and the tab 12, a portion of the tab overlaps and is welded to the tab 12, and the other portion of the tab (not overlapping with the tab 12) is located on the side of the tab 12 near the first flange 112, so that the tab and the tab 12 are connected by bending the other portion of the tab along the outer edge of the tab 12 near the first flange 112.
In the process of connecting the tab with the tab 12, although the other portion of the tab is bent along the outer edge of the tab 12, the tab extends a certain distance beyond the edge of the tab 12 at the bent portion because the tab always has a small thickness.
Therefore, the minimum distance between the edge of the adaptor 12 and the inner edge of the first flange 112 is set to be at least 0.05mm, so that a sufficient gap can be reserved between the adaptor 12 and the first flange 112 for bending the tab, and the bending line after bending the tab is prevented from abutting against the first flange 112, so that the connection configuration of the tab on the adaptor 12 is offset or the tab drives the adaptor 12 to generate offset on the insulating plate 11.
Meanwhile, the minimum distances D1 and D1' between the edge of the switching piece 12 and the inner edges of the first flanges 112 are not more than 300mm, so that the arrangement position of the switching piece 12 between the two first flanges 112 has a larger range, namely, the arrangement position of the switching piece 12 on the insulating plate 11 has a larger adjustment range, when the position of the tab changes, the arrangement position of the switching piece 12 can be correspondingly adjusted, and the switching piece 12 can be ensured to correspond to the tab.
Further, the minimum distance from the edge of each of the turning pieces 12 to the inner edge of the adjacent second flange 113 is D2, 0.05.ltoreq.D2.ltoreq.10mm.
It is understood that the battery temperature is liable to rise when the battery is used for a long period of time, and that the insulating plate 11 is liable to undergo slight thermal expansion when the battery temperature is high.
Thus, by providing the minimum distances (i.e., D1' and D2) from the edge of the adapter piece 12 to the inner edge of the first flange 112 and the inner edge of the adjacent second flange 113 are all greater than 0.05mm, so that there is a buffer gap of 0.05mm between the adapter piece 12 and the first flange 112 and the adjacent second flange 113, when the first flange 112 or the second flange 113 expands, no compression occurs to the adapter piece 12, and the stability of the installation position of the adapter piece 12 is ensured. The minimum distance D2 from the edge of the adapter plate 12 to the edge of the adjacent second flange 113 is not more than 10mm, so that the two adapter plates 12 are respectively close to the two different second flanges 113, thereby ensuring enough gaps between the two adapter plates 12, avoiding short circuit of the battery caused by contact of the two adapter plates 12, and improving the safety of the battery.
The battery end cover assembly 100 of the application has a larger adjustable range of the setting position of the switching piece 12 on the insulating plate 11, can ensure the corresponding setting of the switching piece 12 and the tab, reduces or avoids the poor contact condition of the switching piece 12 and the tab in the assembly of the battery end cover assembly 100, and reduces the defective proportion of the battery end cover assembly 100. Meanwhile, after the switching pieces 12 are connected to the insulating plate 11, the arrangement positions of the switching pieces 12 are not easy to deviate, and enough gaps are reserved between the two switching pieces 12, so that the risk of short circuit between tabs or between the switching pieces 12 caused by deviation of the switching pieces 12 is reduced or avoided, and the safety of the battery is improved.
In some embodiments, as shown in fig. 2, the tab 12 includes a pole weld region 121, the pole weld region 121 having a dimension L1 along the width of the end cap 10, and the pole weld region 121 having a dimension L2 along the length of the end cap 10.
It will be appreciated that the pole weld area 121 is located on the tab 12, i.e., a portion of the tab 12 is located between the pole weld area 121 and the first flange 112 and its adjacent second flange 113. Since the tab 12 is welded to the pole at the pole welding area 121, the tab 12 can have a certain rigidity at the pole welding area 121.
In this embodiment, the minimum distances from the edge of the post weld region 121 to the inner edges of the two first flanges 112 are W1 and W1',2×l1+.w1+.10χl1 and 2×l1+.w1' +.10χl1, respectively. Meanwhile, the minimum distance from the edge of the post welding region 121 to the inner edge of the adjacent second flange 113 is W2, and 2×l2+.w2+.10χl2.
Thus, by providing the minimum distances W1 and W1' from the edge of the post welding region 121 to the inner edges of the two first flanges 112 to be at least 2 times the dimension L1 of the post welding region 121 in the width direction of the end cover 10, it is ensured that a part of the switching piece 12 can be located between the post welding region 121 and the first flanges 112, facilitating the positional arrangement of the switching piece 12 on the insulating plate 11. Meanwhile, a sufficient gap is reserved between the pole welding area 121 and the first flange 112, so that blocking influence of the first flange 112 on welding operation during pole welding can be reduced or avoided, and welding effect is guaranteed.
Meanwhile, the minimum distances W1 and W1' from the edge of the pole welding area 121 to the inner edges of the two first flanges 112 are not more than 10 times the dimension L1 of the pole welding area 121 along the width direction of the end cover 10, so that the fact that the part of the switching piece 12 between the pole welding area 121 and the first flanges 112 occupies the whole of the switching piece 12 is prevented from being excessively high, the whole of the switching piece 12 is ensured to have certain rigidity, and bending of the switching piece 12 is reduced or avoided.
Therefore, the setting position of the switching piece 12 on the insulating plate 11 is convenient to adjust, the switching piece 12 and the pole column can be guaranteed to have a good connection effect, and the switching piece 12 is not easy to deform.
Likewise, by setting the minimum distance W2 from the edge of the post welding region 121 to the inner edge of the adjacent second flange 113 to be at least 2 times the dimension L2 of the post welding region 121 along the length direction of the end cover 10 and not more than 10 times the dimension L2 of the post welding region 121 along the length direction of the end cover 10, it is also possible to facilitate adjustment of the setting position of the switching piece 12 on the insulating plate 11 while ensuring a good connection effect between the switching piece 12 and the post, and the switching piece 12 is also not easily deformed.
In this embodiment, the shape of the tab land 122 is not limited. For example, in fig. 2, the post weld 121 is annular, and in this case, the dimensions of L1 and L2 are both the outer ring diameter of the annular. For another example, the post weld 121 may be rectangular, where L1 and L2 are the length and width of the rectangle, respectively.
In some embodiments, as shown in fig. 3, the tab 12 includes two tab lands 122, the tab lands 122 having a dimension L3 along the width of the end cap 10 and the tab lands 122 having a dimension L4 along the length of the end cap 10.
In this embodiment, the minimum distance from the edge of the tab welding region 122 to the inner edge of the adjacent first flange 112 is W3, and 0.3×l3+.w3+.2χl3. Meanwhile, the minimum distance from the edge of the tab welding region 122 to the inner edge of the adjacent second flange 113 is W4, and L4 is equal to or less than W4 is equal to or less than 4.
It will be appreciated that the connection stability of the tab and the tab 12 is positively correlated with the size of the tab welding area 122, and that one tab 12 connects two tabs, i.e. one tab 12 has two tab welding areas 122.
Therefore, the minimum distance W3 from the edge of the tab welding area 122 to the inner edge of the adjacent first flange 112 is at least 0.3 times the dimension of the tab welding area 122 along the width direction of the end cover 10 is L3, when the tab is welded and connected to the adapter plate 12, a sufficient gap can be ensured between the tab and the first flange 112, so that the tab is convenient to connect to the adapter plate 12, and the tab is convenient to place after being bent at other parts of the tab.
Meanwhile, the minimum distance W3 from the edge of the tab welding area 122 to the inner edge of the adjacent first flange 112 is set to be not more than 2 times of the dimension L3 of the tab welding area 122 along the width direction of the end cover 10, so that the edge of the tab welding area 122 is closer to the edge of the rotating sheet 12, which is close to the first flange 112, and when the tab is bent along the edge of the rotating sheet 12, which is close to the first flange 112, the distance between the bending line of the tab and the edge of the tab welding area 122 is closer, so that the contact stability of the tab and the rotating sheet 12 is improved.
Similarly, the minimum distance W4 from the edge of the tab welding region 122 to the inner edge of the adjacent second flange 113 is at least 1 time the dimension L4 of the tab welding region 122 along the length direction of the end cover 10, and is not more than 4 times the dimension L4 of the tab welding region 122 along the length direction of the end cover 10, so that the tab is convenient to connect to the adapter 12, and the contact stability between the tab and the adapter 12 is improved.
In some embodiments, as shown in fig. 4, the thickness of the switching sheet 12 is h1, the thickness of the portion of the first flange 112 protruding from the insulating plate main body 111 is h2, and the thickness of the portion of the second flange 113 protruding from the insulating plate main body 111 is h3.
It will be appreciated that the first flange 112 and the second flange 113 protrude toward the side away from the end cap 10 with respect to the insulating plate body 111, and that when the battery end cap assembly 100 is mounted on a battery, the first flange 112 and the second flange 113 are located on the inner side of the battery, and thus the first flange 112 and the second flange 113 can also limit the positioning of the battery end cap assembly 100 on the battery.
In this embodiment, assuming that the length of the first flange 112 is greater than the length of the second flange 113, when the first flange 112 and the second flange 113 play a limiting role on the battery end cover assembly 100, in order to ensure that the bearing capacity of the first flange 112 and the second flange 113 is close, the thickness h3 of the second flange 113 needs to be greater than the thickness h2 of the first flange 112.
It should be noted that, when the tab is connected to the adapter plate 12 and is bent, the bent tab has a certain thickness in a direction away from the cover plate relative to the adapter plate 12, and the first flange 112 and the second flange 113 protrude toward a side away from the end cover 10 relative to the insulating plate main body 111, and also have an effect of providing a bending space for the folded tab.
The thickness of the portion of the first flange 112 protruding out of the insulating plate main body 111 is h2, and h1 is 1.3×h1.ltoreq.h2.ltoreq.8×h1. Meanwhile, the thickness of the portion of the second flange 113 protruding out of the insulating plate main body 111 is h3, and h1 is 2×h3 is less than or equal to 10×h1.
Therefore, the thickness h2 of the portion of the first flange 112 protruding from the insulating plate main body 111 and the thickness h3 of the portion of the second flange 113 protruding from the insulating plate main body 111 are both greater than the thickness h1 of the adaptor 12, so that after the tab is connected to the adaptor 12, a sufficient bending space is provided between the adaptor 12 and the battery cell, and the connection stability of the tab on the adaptor 12 is ensured. While setting h3 greater than h2 ensures that the shorter second flange 113 has a similar load bearing capacity as the longer first flange 112.
In addition, the thickness h2 of the portion of the first flange 112 protruding from the insulating plate main body 111 is smaller than 8 times of the thickness h1 of the adaptor plate 12, and the thickness h3 of the portion of the second flange 113 protruding from the insulating plate main body 111 is smaller than 10 times of the thickness h1 of the adaptor plate 12, so that the thickness of the insulating plate 11 can be prevented from being excessively large, and the thickness of the whole battery end cover assembly 100 can be reduced. When the battery end cap assembly 100 is assembled on a battery, the battery end cap assembly 100 occupies less space inside the battery, which is beneficial to improving the energy density of the battery under a limited battery volume.
Further, as shown in fig. 5 and 6, when the explosion-proof valve 13 is disposed on the end cap 10, the explosion-proof valve 13 is located between the two adapter plates 12, and the battery end cap assembly 100 further includes: the protective cover 14 covering the explosion-proof valve 13, and the thickness of the part of the protective cover 14 protruding out of the insulating plate main body 111 is h4, and h1 is 1.3 h4 is less than or equal to h3.
With such a structure, the thickness h4 of the portion of the shield cap 14 protruding the insulating plate main body 111 does not exceed the thickness h3 of the portion of the second flange 113 protruding the insulating plate main body 111, without increasing the overall thickness of the battery end cap assembly 100. The thickness h4 of the portion of the protective cover 14 protruding out of the insulating plate main body 111 is greater than the thickness h1 of the switching pieces 12, so that the two switching pieces 12 and the lugs connected with the two switching pieces 12 can be separated, and the switching pieces 12 are prevented from being in contact with each other to generate short circuit while the switching pieces 12 are prevented from covering the explosion-proof valve 13.
In some embodiments, as shown in fig. 3, 5 and 7, the cell end cap assembly 100 further comprises: an explosion-proof valve 13 is arranged in the center of the cover plate. The minimum distances from the edges of the two adapter plates 12 to the edge of the explosion-proof valve 13 are D3 and D4, respectively, D3 is more than or equal to 0.1 and less than or equal to 30mm, and D4 is more than or equal to 0.1 and less than or equal to 30mm.
Thereby, the two switching pieces 12 are separated at both sides of the explosion-proof valve 13, and the distances (D3 and D4) between the edges of the two switching pieces 12 and the edge of the explosion-proof valve 13 are both greater than 0.1mm, so that the switching pieces 12 can be prevented from blocking the explosion-proof valve 13, and at the same time, the two switching pieces 12 are prevented from contacting to cause a short circuit.
The minimum distance (D3 and D4) between the edges of the two adapter plates 12 and the edge of the explosion-proof valve 13 is smaller than 30mm, the positions of the adapter plates 12 correspond to the positions of the electrodes, and the positions of the adapter plates 12 are similar to the internal pressure of the battery at the explosion-proof valve 13. When the internal pressure of the battery at the position of the adapter piece 12 is too large, the explosion-proof valve 13 also receives similar pressure and plays a role in pressure relief, so that the battery is prevented from bursting at the position of the adapter piece 12, namely the pole.
Further, the insulating plate 11 is an integral plate, which can facilitate the processing of the insulating plate 11 and simplify the setting operation of the insulating plate 11 on the end cap 10. The two adapter plates 12 are symmetrically arranged on the insulating plate 11 relative to the explosion-proof valve 13, the explosion-proof valve 13 is positioned in the center of the end cover 10, and the weight of the battery end cover assembly 100 on two opposite sides of the explosion-proof valve 13 is relatively even by arranging the two adapter plates 12 in a consistent shape and weight, so that the stability of the battery end cover assembly 100 arranged on a battery can be improved.
When the explosion-proof valve 13 is covered with the protective cover 14, as shown in fig. 5, the minimum distance (D3 and D4) from the edge of the two switching pieces 12 to the edge of the explosion-proof valve 13 is actually the minimum distance from the edge of the two switching pieces 12 to the edge of the protective cover 14.
In some embodiments, as shown in fig. 7, the insulating plate 11 includes: the positive electrode insulating plate 11a and the negative electrode insulating plate 11b are provided at intervals along the longitudinal direction of the cap plate, and the two tabs 12 are connected to the positive electrode insulating plate 11a and the negative electrode insulating plate 11b, respectively. Thereby, the two switching pieces 12 are respectively surrounded by the positive insulating plate 11a and the negative insulating plate 11b, and the explosion-proof valve 13 can be provided between the positive insulating plate 11a and the negative insulating plate 11b, so that the switching pieces 12 can be prevented from blocking the explosion-proof valve 13, and at the same time, the two switching pieces 12 are prevented from contacting to cause a short circuit.
In this embodiment, each of the first flanges 112 is composed of two broken flanges, and the two broken flanges are located on the same side of the positive insulating plate 11a and the negative insulating plate 11b, respectively.
Further, the positive insulating plate 11a and the negative insulating plate 11b are symmetrically disposed with respect to the explosion-proof valve 13, and the two switching pieces 12 are symmetrically disposed with respect to the explosion-proof valve 13. Thus, by providing the positive insulating plate 11a and the negative insulating plate 11b in the same shape and weight, and the two tabs 12 in the same shape and weight, the weight of the battery end cap assembly 100 on the opposite sides of the explosion-proof valve 13 can be made more uniform, and the stability of the battery end cap assembly 100 in the battery can be improved.
In some embodiments, as shown in fig. 3, 5 and 7, when two tab lands 122 are provided on the rotor plate 12, the tab lands 122 have a dimension L4 along the length of the end cap 10. The minimum distances from the edge of the tab welding area 122 on the two adapter plates 12 to the edge of the explosion-proof valve 13 are W5 and W6, wherein W4 is less than or equal to W5 and less than or equal to 5 and L4 is less than or equal to W6 and less than or equal to 5 and L4.
In this embodiment, by setting the minimum distances W5 and W6 from the edge of the tab welding region 122 to the edge of the explosion-proof valve 13 to be at least 1 time the dimension L4 of the tab welding region 122 in the longitudinal direction of the end cap 10, a sufficient gap is provided between the tab welding region 122 and the explosion-proof valve 13 so that the tab does not form a barrier to the explosion-proof valve 13 when the tab is welded to the adapter piece 12. Meanwhile, the explosion-proof valve 13 does not influence the welding operation at the lug welding area 122, so that the welding effect of the lug and the adapter piece 12 is ensured.
The minimum distances W5 and W6 from the edge of the tab welding area 122 to the edge of the explosion-proof valve 13 are not more than 5 times the dimension L4 of the tab welding area 122 along the length direction of the end cover 10, so that the ratio of the tab between the tab welding area 122 and the explosion-proof valve 13 to the whole tab is smaller, and when the tab is welded with the adapter plate 12, the tab is not easily moved by the part between the tab welding area 122 and the explosion-proof valve 13, thereby ensuring the welding and fixing effect of the tab on the adapter plate 12.
When the explosion-proof valve 13 is covered with the protective cover 14 as shown in fig. 5, the minimum distance (W5 and W6) from the edge of the two tab lands 122 to the edge of the explosion-proof valve 13 is actually the minimum distance from the edge of the two switching pieces 12 to the edge of the protective cover 14.
In some embodiments, a limiting portion (not shown in the drawings) is provided on the insulating plate 11 corresponding to the switching piece 12. With such a structure, the stopper portion facilitates positioning the position of the switching piece 12 on the insulating plate 11, facilitating the mounting of the switching piece 12 on the battery end cap assembly 100. And when the switching piece 12 is welded with the pole post and the pole lug, the limit post can also avoid the switching piece 12 from moving along the insulating plate main body 111, so as to improve the stability of the switching piece 12 on the insulating plate 11.
An energy storage device according to an embodiment of the present invention includes the battery end cap assembly 100 of the above-described embodiment.
According to the energy storage device, through the adoption of the battery end cover assembly 100, the corresponding arrangement of the switching piece 12 and the lug can be ensured, the situation of poor contact between the switching piece 12 and the lug is reduced or avoided in the assembly of the battery end cover assembly 100, and the defective proportion of the battery end cover assembly 100 is reduced. Meanwhile, the risk of short circuit in the energy storage device can be reduced or avoided, and the safety of the energy storage device is improved.
The electric equipment comprises the energy storage device.
According to the electric equipment, the energy storage device of the embodiment is adopted, so that the short circuit risk in the electric equipment can be reduced or avoided, and the safety of the electric equipment is improved.
Other configurations and operations of battery end cap assembly 100, energy storage devices, and powered devices according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means 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 invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims (11)

1. A battery end cap assembly, comprising:
an end cap (10);
an insulating plate (11), wherein the insulating plate (11) is connected to one side of the end cover (10);
the two adapter pieces (12) are arranged on one side, far away from the end cover (10), of the insulating plate (11), and the two adapter pieces (12) are arranged at intervals along the length direction of the end cover (10);
an explosion-proof valve (13), wherein the explosion-proof valve (13) is arranged in the center of the end cover (10);
wherein the insulating plate (11) comprises: an insulating plate main body (111), two first flanges (112) and two second flanges (113), wherein the two first flanges (112) are connected to opposite sides of the insulating plate main body (111), the two second flanges (113) are connected to opposite sides of the insulating plate main body (111), and the first flanges (112) and the second flanges (113) protrude towards one side away from the end cover (10) relative to the insulating plate main body (111);
the minimum distance from the edge of each adapter piece (12) to the inner edges of the two first flanges (112) is D1 and D1', wherein D1 is more than or equal to 0.05 and less than or equal to 300mm, and D1' is more than or equal to 0.05 and less than or equal to 300mm;
the minimum distance from the edge of each adapter piece (12) to the inner edge of the adjacent second flange (113) is D2, and D2 is more than or equal to 0.05 and less than or equal to 10mm;
the minimum distances from the edges of the two adapter plates (12) to the edge of the explosion-proof valve (13) are D3 and D4, D3 is more than or equal to 0.1 and less than or equal to 30mm, and D4 is more than or equal to 0.1 and less than or equal to 30mm.
2. The battery end cap assembly according to claim 1, wherein the adapter tab (12) includes a post weld region (121), the post weld region (121) having a dimension L1 in a width direction of the end cap (10), the post weld region (121) having a dimension L2 in a length direction of the end cap (10);
the minimum distances from the edge of the pole welding area (121) to the inner edges of the two first flanges (112) are W1 and W1',2 x L1 is less than or equal to W1 and less than or equal to 10 x L1, and 2 x L1 is less than or equal to W1' isless than or equal to 10 x L1;
the minimum distance from the edge of the pole welding area (121) to the inner edge of the adjacent second flange (113) is W2, and W2 is more than or equal to 2 and less than or equal to 10 and less than or equal to 2.
3. The battery end cap assembly according to claim 1, wherein the adapter tab (12) includes two tab welding areas (122), the tab welding areas (122) having a dimension L3 in the width direction of the end cap (10), the tab welding areas (122) having a dimension L4 in the length direction of the end cap (10);
the minimum distance from the edge of the tab welding area (122) to the inner edge of the adjacent first flange (112) is W3, wherein W3 is more than or equal to 0.3 and less than or equal to 2 and less than or equal to 3;
the minimum distance from the edge of the tab welding area (122) to the inner edge of the adjacent second flange (113) is W4, and L4 is less than or equal to W4 and less than or equal to 4 is L4.
4. The battery end cap assembly of claim 1, wherein the adapter tab (12) has a thickness h1;
wherein the thickness of the part of the first flange (112) protruding out of the insulating plate main body (111) is h2, and h1 is more than or equal to 1.3 and less than or equal to 8 h1;
the thickness of the part of the second flange (113) protruding out of the insulating plate main body (111) is h3, and h1 is more than or equal to 2 and less than or equal to 10 h1.
5. Battery end cap assembly according to claim 1, characterized in that the insulating plate (11) is an integral plate, and the two adapter tabs (12) are symmetrically arranged on the insulating plate (11) with respect to the explosion-proof valve (13).
6. The battery end cap assembly according to claim 1, wherein the insulating plate (11) comprises: the positive insulation plate (11 a) and the negative insulation plate (11 b), the positive insulation plate (11 a) and the negative insulation plate (11 b) are arranged at intervals along the length direction of the end cover (10), and the two adapter plates (12) are respectively connected to the positive insulation plate (11 a) and the negative insulation plate (11 b).
7. The battery end cap assembly according to claim 6, wherein the positive insulating plate (11 a) and the negative insulating plate (11 b) are symmetrically disposed with respect to the explosion-proof valve (13), and the two adapter tabs (12) are symmetrically disposed with respect to the explosion-proof valve (13).
8. The battery end cap assembly of claim 1, when two tab welding areas (122) are provided on the adapter piece (12), the tab welding areas (122) have a dimension L4 along the length direction of the end cap (10);
the minimum distances from the edges of the two lug welding areas (122) to the edge of the explosion-proof valve (13) are W5 and W6, wherein W4 is less than or equal to W5 and less than or equal to 5 and L4 is less than or equal to W6 and less than or equal to 5 and L4.
9. The battery end cap assembly according to any one of claims 1 to 4, wherein the insulating plate (11) is provided with a stopper portion corresponding to the adapter piece (12).
10. An energy storage device, comprising: the battery end cap assembly (100) of any of claims 1-9.
11. A powered device comprising an energy storage device according to claim 10.
CN202211412097.8A 2022-11-11 2022-11-11 Battery end cover assembly, energy storage device and electric equipment Active CN115663363B (en)

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CN202211412097.8A CN115663363B (en) 2022-11-11 2022-11-11 Battery end cover assembly, energy storage device and electric equipment
PCT/CN2022/142024 WO2024098528A1 (en) 2022-11-11 2022-12-26 Battery end cover assembly, energy storage apparatus and electric device

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