WO2022116469A1 - 电池 - Google Patents

电池 Download PDF

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Publication number
WO2022116469A1
WO2022116469A1 PCT/CN2021/089033 CN2021089033W WO2022116469A1 WO 2022116469 A1 WO2022116469 A1 WO 2022116469A1 CN 2021089033 W CN2021089033 W CN 2021089033W WO 2022116469 A1 WO2022116469 A1 WO 2022116469A1
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WO
WIPO (PCT)
Prior art keywords
spacer
pole core
tab
channel
clamping
Prior art date
Application number
PCT/CN2021/089033
Other languages
English (en)
French (fr)
Inventor
高新
邓洞军
王信月
张达
罗文�
Original Assignee
比亚迪股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 比亚迪股份有限公司 filed Critical 比亚迪股份有限公司
Publication of WO2022116469A1 publication Critical patent/WO2022116469A1/zh

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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
    • 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
    • H01M50/59—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

Definitions

  • the present application relates to the field of batteries, in particular to a battery.
  • the pole core lead-out structure (pole tab) is usually bent in different situations after being connected with the battery lead-out structure. Form a certain angle with the boundary line of the pole piece dressing. When the root of the tab is seriously inclined, it will cross the diaphragm, so that the tab of one pole and the pole piece of the other pole, or the tab of the pole and the pole piece of the other pole are in contact, resulting in a short circuit of the secondary battery.
  • the angle formed by the pole tab and the boundary line of the pole piece dressing that is, the "tab bending angle" or " ⁇ angle”.
  • the positive tab overwhelms the diaphragm after being bent.
  • the angle of the positive tab is too large or too small, the positive tab, the separator and the negative electrode material will be tightly closed. touch.
  • the diaphragm that is squeezed during battery use may be damaged and lead to insulation failure, thus posing a safety hazard.
  • the present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a battery with higher safety in use.
  • a battery comprising: a pole core, one end of the pole core is provided with a first pole lug, the other end of the pole core is provided with a second pole lug; a first spacer ring, the first spacer ring is provided at the At one end of the pole core, the first spacer is provided with a first channel for the first pole lug to pass through; the second spacer is provided at the other end of the pole core, the The second spacer is provided with a second passage for the second tab of the battery to pass through; a connecting piece is connected with the first spacer and the second spacer to fix the first spacer and the second spacer.
  • the first spacer ring is provided at the first end of the pole core where the first tab is provided, and the second spacer is provided at the second end where the second electrode tab is provided, and the first tab passes through the first spacer
  • the first channel is connected to the first lead-out piece
  • the second pole lug is connected to the second lead-out piece through the second channel of the second spacer
  • the connecting piece can fix the first spacer and the second spacer, and the three cooperate together It plays the role of supporting the first tab and the second tab, reduces the risk of short circuit of the battery, and improves the safety of the battery.
  • Fig. 1 is the structural representation that the positive electrode ear of the battery in the prior art is bent and overwhelmed the diaphragm;
  • FIG. 2 is a schematic structural diagram of a battery according to an embodiment of the present invention.
  • FIG. 3 is a cross-sectional view of a battery according to an embodiment of the present invention.
  • Fig. 4 is the partial enlarged schematic diagram of Fig. 3;
  • FIG. 5 is a schematic structural diagram of an angle of a first spacer or a second spacer of a battery according to an embodiment of the present invention
  • FIG. 6 is a schematic structural diagram of another angle of a first spacer or a second spacer of a battery according to an embodiment of the present invention.
  • FIG. 7 is a cross-sectional view at an angle of a first spacer or a second spacer of a battery according to an embodiment of the present invention.
  • FIG. 8 is a cross-sectional view from another angle of a first spacer or a second spacer of a battery according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of a connector of a battery according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of the assembly of the first spacer, the second spacer and the connector of the battery according to an embodiment of the present invention.
  • first and second are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as “first” or “second” may expressly or implicitly include one or more of that feature. Further, in the description of the present application, unless otherwise specified, "plurality" means two or more.
  • the battery 100 according to the embodiment of the present invention is an invention made by the inventor of the present application based on the following facts.
  • the squeezed diaphragm may be damaged due to factors such as vibration and friction between the squeezed materials.
  • the insulation fails, the positive and negative electrodes are in contact, resulting in a short circuit inside the battery.
  • the reasons for this are: 1. The edges of the positive aluminum foil and negative copper foil are not coated with insulating coating or the coating thickness or coating width is not enough; 2. When the tab is bent, the bending angle is too small, resulting in The positive and negative electrodes and the diaphragm are squeezed against each other; 3. There is no spacer between the positive and negative electrodes to protect and fix the tabs, causing the tabs to move during the battery manufacturing process or subsequent use.
  • Soft-pack batteries usually use aluminum-plastic film as the packaging material.
  • the outer layer of the aluminum-plastic film is nylon, the middle is Al foil, and the inner layer is PP.
  • the battery may be squeezed, vibrated, and impacted, and the inner or outer plastic insulating layer of the aluminum-plastic film may be damaged by external forces, resulting in insulation failure, resulting in the aluminum-plastic film, the positive and negative ears, and the outer metal structure of the soft package. Direct conduction, forming a safety hazard.
  • a battery 100 includes: a pole core 10 , a first spacer 20 , a second spacer 30 , a connector 40 , a first lead-out piece 50 and a second lead-out piece 60 .
  • one end of the pole core 10 is provided with a first pole lug 11
  • the other end of the pole core 10 is provided with a second pole lug 12
  • the first spacer 20 is provided at one end of the pole core 10
  • the first spacer 20 is provided with There is a first channel 21 for the first tab 11 to pass through
  • a second spacer 30 is provided at the other end of the pole core 10
  • the second spacer 30 is provided with a second channel 31 for the second tab 12 to pass through.
  • first lead-out sheet 50 extends into the first channel 21 and is connected with the first tab 11
  • first A part of the two lead-out pieces 60 extends into the second channel 31 and is connected to the second tab 12 .
  • the battery 100 is mainly composed of a pole core 10 , a pole core support structure, a first lead-out piece 50 connected to the first tab 11 of the pole core 10 , and a second lead-out piece 50 connected to the pole core 10 .
  • the second lead-out piece 60 connected to the tabs 12 is formed.
  • the pole core support structure includes a first spacer 20 and a second spacer 30 arranged at both ends of the pole core 10 , a connector 40 connecting the first spacer 20 and the second spacer 30 , and the first pole lug 11 is provided at One end of the pole core 10, the second pole lug 12 is arranged on the opposite end of the pole core 10 and the first pole lug 11, the two ends of the pole core are respectively provided with multi-layer pole lugs, and the multi-layer pole lugs at each end are combined to form a whole.
  • the first pole lug 11 or the second pole lug 12 of the pole core 10 one end of the pole core 10 is provided with a first spacer 20, the first pole lug 11 passes through the first channel 21 on the first spacer 20, and the pole core The other end of the 10 is provided with a second spacer 30, the second tab 12 passes through the second channel 31 on the second spacer 30, and a part of the first lead-out sheet 50 extends into the first spacer 20 and the first tab.
  • the connecting piece 40 is used to fix the first spacer 20 and the second spacer 30, the first spacer 20
  • the position of the second spacer 30 is fixed, it can support the first tab 11 and the second tab 12 at both ends of the pole core 10, reduce the bending or lodging of the tab, and avoid the tab and the different pole.
  • the pole piece contacts are short-circuited, thereby reducing the possibility of short-circuiting of the battery 100 .
  • the battery 100 is a soft pack battery
  • the pole core 10 in the soft pack battery is composed of a positive electrode sheet, a positive electrode tab, a separator, a negative electrode sheet, and a negative electrode tab.
  • the structure sealed by the aluminum-plastic film can be understood and easily realized by those skilled in the art, and thus will not be described in detail.
  • the first spacer 20 is provided on the first end of the pole core 10 where the first tab 11 is provided, and the second spacer 20 is provided on the second end where the second tab 12 is provided.
  • Spacer 30 the first tab 11 is connected to the first lead-out piece 50 through the first channel 21 of the first spacer 20, and the second tab 12 passes through the second channel 31 of the second spacer 30 and is connected to the second lead-out
  • the sheet 60 is connected, and the connector 40 can fix the first spacer 20 and the second spacer 30.
  • the three work together to support the first tab 11 and the second tab 12, reduce the risk of short circuit of the battery 100, and improve the battery 100 use safety.
  • the upper end of the pole core 10 is provided with a first pole lug 11
  • the lower end of the pole core 10 is provided with a second pole lug 12
  • the first spacer 20 is connected to the second pole lug 12 .
  • the two spacers 30 are arranged opposite to each other and have the same structure.
  • the cross section of the pole core 10 can be a long strip structure extending in the up-down direction.
  • the structure of the diode lugs 12 can be of the same design.
  • the first spacer 20 is arranged at the upper end of the pole core 10
  • the second spacer 30 is arranged at the lower end of the pole core 10
  • the first spacer 20 and the second spacer 30 are in the same design.
  • the structure is the same.
  • the connecting piece 40 extends in the up-down direction, the upper end of the connecting piece 40 is connected with the first spacer 20
  • the lower end of the connecting piece 40 is connected with the second spacer 30 , so as to realize the assembly and fixation of the counter pole core 10 .
  • the first spacer 20 and the second spacer 30 are respectively elongated, and the first spacer 20 includes: two first clamping parts 22 and two first connecting parts 23 .
  • the two first clamping parts 22 are spaced apart and disposed opposite to each other, the gap between the two first clamping parts 22 defines the first channel 21 , and a first connecting part 23 is provided in the two first clamping parts One end of the two first clamping parts 22 is connected to one end of the two first clamping parts 22 , and another first connecting part 23 is provided at the other end of the two first clamping parts 22 and is connected to the other end of the two first clamping parts 22 . connected at one end.
  • the second spacer 30 includes: two second clamping parts and two second connecting parts.
  • the two second clamping parts are spaced apart and disposed opposite to each other, the gap between the two second clamping parts defines a second channel 31, and a second connecting part is provided at one end of the two second clamping parts and is connected with the two second clamping parts.
  • One end of each of the second clamping parts is connected, and the other second connection part is arranged at the other end of the two second clamping parts and is connected with the other end of the two second clamping parts.
  • the assembly structure of the upper end of the pole core 10 is similar to the assembly structure of the lower end, the following will take the assembly structure of the upper end of the pole core 10 as an example to describe the structures of the first spacer 20 , the first tab 11 and the first lead-out piece 50 in detail. .
  • the shape of the first spacer 20 is a rectangular parallelepiped.
  • the first spacer 20 is mainly composed of two first clamping parts 22 and two first connecting parts 23 .
  • the two first connecting parts 23 By displacing both ends of the first spacer 20 , two first clamping parts 22 are arranged opposite to each other between the two first connecting parts 23 , and one end of the two first clamping parts 22 is connected to the same first clamping part 22 .
  • the other ends of the two first clamping parts 22 are connected to another first connecting part 23 , and the gap between the two first clamping parts 22 defines the first channel 21 .
  • the first connecting portion 23 is block-shaped, the side of the first connecting portion 23 facing the pole core 10 protrudes from the side of the first clamping portion 22 facing the pole core 10 , and the first connecting portion 23 protrudes from the side of the first clamping portion 22 facing the pole core 10 .
  • the part 23 presses the pole core 10 relative to the protruding part of the first clamping part 22
  • the second connecting part is block-shaped, and the side of the second connecting part facing the pole core 10 protrudes from the second clamping part facing the pole core 10, and the second connecting portion presses the pole core 10 relative to the protruding portion of the second clamping portion.
  • the lower surface of the first connecting portion 23 extends downward beyond the first clamping portion 22, and the excess part of the first connecting part 23 squeezes the diaphragm on both sides of the first pole lug 11 on the pole core 10, and the first connecting part 23 squeezes the diaphragm to make the edge retracted in a length of 1mm-3mm,
  • the length can be determined according to the design of the pole core 10 and the length of the separator beyond the positive electrode sheet and the negative electrode sheet, and at the same time consider the packaging size requirements of the battery 100 and the expansion degree of the pole core 10 during packaging.
  • the first connecting part 23 squeezes the diaphragm, so that the positions of the positive electrode, the diaphragm and the negative electrode are fixed, so as to limit the relative movement between the positive electrode and the negative electrode and the diaphragm, and reduce the friction between the edges of the positive electrode and the negative electrode and the diaphragm. , thereby reducing the possibility that the sharp edges or burrs of the positive electrode sheet and the negative electrode sheet will damage the separator and cause a short circuit between the positive and negative electrodes.
  • both ends of the first spacer 20 and the second spacer 30 are fixed by the connecting piece 40 , and the connecting piece 40 cooperates with the first spacer 20 and the second spacer 30 to fix the pole in the width direction of the pole core 10 . core 10, and simultaneously pull the first spacer 20 and the second spacer 30 to ensure that the diaphragms on both sides of the positive electrode sheet and the negative electrode sheet are pressed tightly.
  • the thicker part can press the diaphragm of the pole core 10, so that the positive electrode sheet is And the position of the negative electrode piece is fixed, thereby fixing the lead-out position of the first tab 11 and the second tab 12, and the compressed diaphragm forms clamping and support for the root of the first tab 11 and the second tab 12, so as to achieve control
  • the compressed diaphragm can limit the bending or lodging of the edges of the positive electrode and the negative electrode as well as the first tab 11 and the second tab 12, and reduce the damage of the integrity of the separator and cause the positive and negative Possibility of extreme short circuit.
  • the first spacer 20 and the second spacer 30 can separate the edges of the positive and negative electrode sheets from the aluminum-plastic film, preventing the possibility of contact between the two and preventing the occurrence of a short circuit.
  • the first clamping portion 22 includes a first limiting transverse plate 221 , and the inner sides of the two first limiting transverse plates 221 of the two first clamping portions 22 are disposed opposite to and define The first channel 21 exits;
  • the second clamping portion includes a second limiting transverse plate, and the inner sides of the two second limiting transverse plates of the two second clamping portions are oppositely arranged and define a second channel 31 .
  • the first clamping portion 22 further includes a first limiting vertical plate 222 .
  • the first limiting longitudinal plate 222 is connected to the outer side surface of the first limiting transverse plate 221 , and the first limiting plates of the two first clamping portions 22 are connected with each other.
  • the vertical plates 222 are arranged opposite to each other;
  • the second clamping part further includes a second limiting vertical plate, the second limiting vertical plate is connected with the outer side surface of the second limiting transverse plate, and the second limiting plate of the two second clamping parts is
  • the positioning vertical plates are arranged opposite to each other, and a plurality of reinforcing ribs 224 are arranged between the first limiting horizontal plate 221 and the first limiting vertical plate 222 along the length direction of them.
  • a plurality of reinforcing ribs spaced along the longitudinal direction are arranged between the longitudinal plates.
  • the first clamping portion 22 is composed of a first limiting horizontal plate 221 and a first limiting vertical plate 222 .
  • the sides are connected, the inner sides of the first limiting transverse plates 221 of the two first clamping parts 22 are facing opposite, and the spaced gap defines the first channel 21 , and the first limiting plates 22 of the two first clamping parts 22 are facing each other.
  • the vertical plates 222 are opposite and parallel to each other.
  • a plurality of reinforcing ribs 224 are arranged between the first limiting transverse plate 221 and the first limiting longitudinal plate 222 , the plurality of reinforcing ribs 224 can be parallel to each other, and each reinforcing rib 224 is respectively connected to the first limiting transverse plate 221 and the The first limiting vertical plates 222 are connected to each other.
  • this structure makes the first clamping part 22 integrally formed as a hollowed-out structure from the top surface, which can reduce the amount of material and reduce the weight; reinforcing ribs 224 are added to the hollowed-out part to ensure the strength of the first clamping part 22. Avoid excessive deformation and lead to failure.
  • a side surface of the first limiting transverse plate 221 facing the pole core 10 is a first guide surface 223 , and the two first guide surfaces 223 are configured as inclined surfaces extending obliquely toward each other and away from the pole core 10 .
  • the side surface of the second limiting transverse plate facing the pole core 10 is a second guide surface, and the two second guide surfaces are configured as inclined surfaces extending obliquely toward each other and away from the pole core 10 .
  • the pole core 10 extends in the up-down direction, and the lower surfaces of the two first limiting transverse plates 221 of the first clamping portion 22 are both formed as Inclined surfaces, the two inclined surfaces extend from both sides of the pole core 10 to the middle position and away from the pole core 10 respectively.
  • the lead-out space for the first tab 11 is convenient for the first tab 11 to protrude from the first channel 21, and the guide surface fits the lead-out angle of the first tab 11 (the angle formed by the outermost tab and the vertical direction) to form an avoidance.
  • the position angle ⁇ , the avoidance angle can increase the limit for the first tab 11, prevent the first tab 11 from expanding outward, maintain the constricted shape of the first tab 11, and at the same time the first clamping portion 22 and the first tab A gap is left between the first tabs 11 to leave a certain space for movement of the first tabs 11 , so as to avoid pressing the first tabs 11 .
  • the examples shown in FIG. 3 and FIG. 4 are only for the convenience of explaining the present application, and do not limit the arrangement direction of the pole cores 10.
  • the pole cores 10 can be adjusted according to the actual situation.
  • the first guide surface 223 and the second guide surface can respectively extend from the two sides of the pole core 10 to the middle position, and extend obliquely to both ends along the extending direction of the pole core 10, so as to facilitate the lead-out of the pole ears.
  • the outer side of the first limiting vertical plate 222 is parallel to the outer side of the pole core 10 , and a first guide surface 223 is connected to the outer side of the first limiting vertical plate 222 on the corresponding side.
  • the included angle between them is the avoidance angle ⁇ 1
  • the included angle between the other first guide surface 223 and the outer side surface of the first limit vertical plate 222 on the corresponding side is the avoidance angle ⁇ 2
  • one first guide surface The included angle between 223 and the outer side surface of the first limit vertical plate 222 on the corresponding side is shown in FIGS. 4 and 8 , that is, after the first limit horizontal plate 221 is connected with the first limit vertical plate 222 the angle formed between the outer surfaces of the The longitudinal height l1 of the first limiting vertical plate 222 satisfies:
  • w 1 is the thickness of the pole core 10 on one side of the first tab 11
  • w 2 is the thickness of the pole core 10 on the other side of the first tab 11
  • g 1 is the width of the first channel
  • ⁇ is the total length of the first lead-out piece extending between the two first limiting longitudinal plates 222 and the first channel;
  • the outer side surface of the second limit vertical plate is parallel to the outer side surface of the pole core 10 , the included angle between one second guide surface and the outer side surface of the second limit vertical plate on the corresponding side is the avoidance angle ⁇ 3 , and the other The included angle between a second guide surface and the outer side surface of the second limit vertical plate on the corresponding side is the avoidance angle ⁇ 4 , and the longitudinal height l 2 of the second limit vertical plate satisfies:
  • w 3 is the thickness of the pole core 10 on one side of the second tab 12
  • w 4 is the thickness of the pole core 10 on the other side of the second tab 12
  • g 2 is the width of the second channel
  • ⁇ It is the total length of the second lead-out piece extending between the two second limiting longitudinal plates and the second channel.
  • the position of the pole lug since the position of the pole lug is not necessarily in the middle of the thickness of the pole core, it may be biased to one side of the large surface.
  • ⁇ 1 and ⁇ 2 are not equal because the thicknesses w 1 and w 2 of the pole cores assigned to the two sides are not equal.
  • l 1 1/2(wg 1 )cot ⁇ 1 + ⁇ , where w is the thickness of the pole core 10 , and ⁇ 1 is the difference between a first guide surface 223 and the outer side surface of the first limit vertical plate 222 on the corresponding side
  • the included angle between , g 1 is the width of the first channel
  • l 2 1/2(wg 2 )cot ⁇ 3 + ⁇ , where w is the thickness of the pole core 10 , and ⁇ 3 is the distance between a second guide surface and the outer side surface of the second limit vertical plate on the corresponding side
  • the included angle, g 2 is the width of the second channel.
  • the lengths of the first limit vertical plate and the second limit vertical plate can be The calculation is performed according to the widths of the first channel 21 and the second channel 31 respectively.
  • the battery 100 further includes: a sealing sheet 70, the sealing sheet 70 is provided on the outer periphery of the first lead-out sheet 50 and the second lead-out sheet 60, and a part of the sealing sheet 70 extends into the first spacer 20 or the second spacer 30; ⁇ satisfies:
  • x is the length of the overlapping connection between the first tab 11 and the first lead-out piece 50 or the length of the overlapping connection between the second tab 12 and the second lead-out piece 60
  • y is the sealing sheet 70 and the corresponding first tab 11 Or the distance between the second tabs 12
  • z is the length of the sealing sheet 70 extending into the first spacer 20 or the second spacer 30 .
  • the value of ⁇ is determined by the material properties of the first spacer 20 , the designed structural strength and the connection process of the first tab 11 accommodated in the first spacer 20 and the first lead-out piece 50 .
  • a tab protection space is formed, which restricts the free movement of the tab, helps to maintain the stability of the tab state, and prevents current collectors damage and the occurrence of various short-circuit conditions.
  • both ends of the first spacer 20 are respectively provided with first mounting portions 25
  • both ends of the second spacer 30 are respectively provided with second mounting portions
  • There are two connecting pieces 40 each connecting piece 40 is respectively a sheet
  • both ends of each connecting piece 40 are respectively provided with a third mounting portion 41
  • the third mounting portion 41 is connected with the first mounting portion 25 and the second mounting portion 41 .
  • the parts are detachably connected.
  • the first mounting portion 25 is a protruding column disposed at both ends of the first spacer 20
  • the second mounting portion is a convex column disposed at both ends of the second spacer 30
  • the connecting piece 40 is a sheet
  • the third mounting portion 41 is a Mounting holes corresponding to the bosses.
  • the connecting member 40 is in the form of a sheet, and both ends are provided with openings for connecting with the first spacer 20 and the second spacer 30 respectively.
  • the design is simple in structure, low in cost, convenient in assembly and high in stability.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

一种电池(100)，包括：极芯(10)，极芯(10)的一端设有第一极耳(11)，极芯(10)的另一端设有第二极耳(12)；第一隔圈(20)设于极芯(10)的一端，第一隔圈(20)设有供第一极耳(11)通过的第一通道(21)；第二隔圈(30)设于极芯(10)的另一端，第二隔圈(30)设有供第二极耳(12)通过的第二通道(31)；连接件(40)与第一隔圈(20)和第二隔圈(30)相连以固定第一隔圈(20)和第二隔圈(30)；第一引出片(50)和第二引出片(60)，第一引出片(50)与第一极耳(11)相连，第二引出片(60)与第二极耳(12)相连。

Description

电池
相关申请的交叉引用
本申请要求比亚迪股份有限公司于2020年12月04日提交的、申请名称为“电池”的、中国专利申请号“202011400924.2”的优先权。
技术领域
本申请涉及电池领域，具体涉及一种电池。
背景技术
目前，在二次电池中，极芯引出结构(极耳)在与电池引出结构连接之后通常会发生不同情况的弯折，弯折的极耳根部偏离直立位置，发生倾斜，使隔膜受压迫，和极片敷料边界线形成一定的角度。极耳根部在倾斜严重时会越过隔膜，从而一极极耳与另一极的极片，或，极耳与异极极片接触造成二次电池发生短路。极耳与极片敷料边界线所形成的角度，即“极耳折弯角”或“ζ角”。
如图1所示：以正极耳(Al箔)为例，正极耳折弯后压倒隔膜，当正极耳折弯的角度过大或者过小时，会导致正极耳、隔膜、负极料三者紧紧接触。在电池使用过程中被挤压的隔膜可能破损导致绝缘失效，从而造成安全隐患。
发明内容
本申请旨在至少解决现有技术中存在的技术问题之一。为此，本申请提出一种电池，所述电池的使用安全性更高。
一种电池，包括：极芯，所述极芯的一端设有第一极耳，所述极芯的另一端设有第二极耳；第一隔圈，所述第一隔圈设于所述极芯的一端，所述第一隔圈设有供所述第一极耳通过的第一通道；第二隔圈，所述第二隔圈设于所述极芯的另一端，所述第二隔圈设有供电池的第二极耳通过的第二通道；连接件，所述连接件与所述第一隔圈和所述第二隔圈相连以固定所述第一隔圈和所述第二隔圈；第一引出片和第二引出片，所述第一引出片的一部分伸入所述第一通道与所述第一极耳相连，所述第二引出片的一部分伸入所述第二通道与所述第二极耳相连。
由此，通过在极芯设有第一极耳的第一端设置第一隔圈，在设有第二极耳的第二端设置第二隔圈，第一极耳穿过第一隔圈的第一通道与第一引出片相连，第二极耳穿过第二隔圈的第二通道与第二引出片相连，连接件可以固定第一隔圈和第二隔圈，三者共同配合起到支撑第一极耳和第二极耳的作用，减少电池短路风险，提高电池使用安全性。
本申请的附加方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本申请的实践了解到。
附图说明
本申请的上述和/或附加的方面和优点从结合下面附图对实施例的描述中将变得明显和容易理解，其中：
图1是现有技术中电池的正极耳折弯压倒隔膜的结构示意图；
图2是根据本发明实施例的电池的结构示意图；
图3是根据本发明实施例的电池的剖面图；
图4是图3的局部放大示意图；
图5是根据本发明实施例的电池的第一隔圈或第二隔圈的一个角度的结构示意图；
图6是根据本发明实施例的电池的第一隔圈或第二隔圈的另一个角度的结构示意图；
图7是根据本发明实施例的电池的第一隔圈或第二隔圈的一个角度的剖视图；
图8是根据本发明实施例的电池的第一隔圈或第二隔圈的另一个角度的剖视图；
图9是根据本发明实施例的电池的连接件的结构示意图；和
图10是根据本发明实施例的电池的第一隔圈、第二隔圈与连接件的装配示意图。
具体实施方式
下面详细描述本申请的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，仅用于解释本申请，而不能理解为对本申请的限制。
在本申请的描述中，需要理解的是，术语“中心”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。
需要说明的是，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。进一步地，在本申请的描述中，除非另有说明，“多个”的含义是两个或两个以上。
根据本发明实施例的电池100是本申请的发明人基于以下事实所得出的发明创造。
目前，常用的软包电池的安装结构中存在如下四个风险点：
1、如图1所示，在正极耳折弯时，若折弯角过小，正极铝箔容易与负极料接触，该问题产生的安全风险最高，造成的安全隐患最大；2、正极料与负极料接触，此现象除隔膜缺陷或金属颗粒刺穿隔膜外，一般不容易发生；3、负极铜箔与正极料接触，此情况在负极极耳折弯角过小时也可能会发生，同样存在安全隐患；4、负极铜箔与正极铝箔接触，此情况在正极耳折弯时也可能发生。
对于上述四个风险点，在第1、第3、第4种情况下，在电池使用过程中，被挤压的隔膜有可能由于振动、被挤压的材料间相互摩擦等因素而发生破损，从而导致绝缘失效，使正负极接触，导致电池内部发生短路。导致此情况发生的原因有：1、正极铝箔和负极铜箔边缘未涂绝缘涂层或涂层的涂覆厚度或涂覆宽度不够；2、极耳折弯时，折弯角太小，导致正负极、隔膜相互挤压；3、正负极耳间无隔圈保护和固定极耳，导致电池制程中或后续使用过程极耳窜动。
软包电池通常采用铝塑膜作为封装材料，铝塑膜外层为尼龙，中间为Al箔，内层为PP。在使用程中，电池可能受到挤压和振动、冲击，铝塑膜内层或者外层的塑料绝缘层可能因外力破坏发生绝缘失效，导致铝塑膜与正负极耳、软包外金属结构直接导通，形成安全隐患。
基于此，本申请的发明人经过长期研究和实验，创造性的得出本申请的如下发明创造。
下面结合附图具体描述根据本发明实施例的电池100。
如图2至图10所示，根据本发明实施例的电池100包括：极芯10、第一隔圈20、第二隔圈30、连接件40、第一引出片50和第二引出片60。
具体而言，极芯10的一端设有第一极耳11，极芯10的另一端设有第二极耳12，第一隔圈20设于极芯10的一端，第一隔圈20设有供第一极耳11通过的第一通道21，第二隔圈30设于极芯10的另一端，第二隔圈30设有供第二极耳12通过的第二通道31，连接件40与第一隔圈20和第二隔圈30相连以固定第一隔圈20和第二隔圈30，第一引出片50的一部分伸入第一通道21与第一极耳11相连，第二引出片60的一部分伸入第二通道31与第二极耳12相连。
如图2所示，根据本发明实施例的电池100主要由极芯10、极芯支撑结构、与极芯10的第一极耳11相连的第一引出片50、与极芯10的第二极耳12相连的第二引出片60构成。其中，极芯支撑结构包括设于极芯10两端的第一隔圈20和第二隔圈30、连接第一隔圈20和第二隔圈30的连接件40，第一极耳11设于极芯10的一端，第二极耳12设于极芯10上与第一极耳11相对的一端，极芯的两端分别设有多层极耳，每端的多层极耳汇合后形成整个极芯10的第一极耳11或者第二极耳12，极芯10的一端设有第一隔圈20，第一极耳11穿过第一隔圈20上的第一通道21，极芯10的另一端设有第二隔圈30，第二极耳12穿过第二隔圈30上的第二通道31，第一引出片50的一部分伸入第一隔圈20与第一极耳11相连，第二引出片60的一部分伸入第二隔圈30与第二极耳12相连，连接件40用于将第一隔圈20和第二隔圈30进行固定，第一隔圈20与第二隔圈30位置固定时，可以对极芯10两端的第一极耳11和第二极耳12起到支撑作用，减少极耳出现弯曲或倒伏的现象，以避免极耳与异极极片接触发生短路，从而减少电池100出现短路的可能。
需要说明的是，根据本发明实施例的电池100为软包电池，软包电池中极芯10由正极片、正极耳、隔膜、负极片、负极耳组成，该装配结构以及极芯10上的第一极耳11与第一引出片50的连接结构、第二极耳12与第二引出片60的连接结构、第一引出片50和第二引出片60与外部的连接结构、电池100整体装配完成之后通过铝塑膜密封的结构对于本 领域技术人员而言是可以理解并且容易实现的，因此不再详细描述。
由此，根据本发明实施例的电池100，通过在极芯10设有第一极耳11的第一端设置第一隔圈20，在设有第二极耳12的第二端设置第二隔圈30，第一极耳11穿过第一隔圈20的第一通道21与第一引出片50相连，第二极耳12穿过第二隔圈30的第二通道31与第二引出片60相连，连接件40可以固定第一隔圈20和第二隔圈30，三者共同配合起到支撑第一极耳11和第二极耳12的作用，减少电池100短路风险，提高电池100使用安全性。
如图2和图3所示，根据本发明的一个实施例，极芯10的上端设有第一极耳11，极芯10的下端设有第二极耳12，第一隔圈20与第二隔圈30相对设置且结构相同。
极芯10的截面可以为在上下方向延伸的长条形结构，第一极耳11设于极芯10的上端，第二极耳12设于极芯10的下端，第一极耳11与第二极耳12的结构可以采用相同设计，第一隔圈20设于极芯10的上端，第二隔圈30设于极芯10的下端，并且第一隔圈20与第二隔圈30的结构相同。连接件40沿上下方向延伸，连接件40的上端与第一隔圈20相连，连接件40的下端与第二隔圈30相连，从而实现对极芯10的装配和固定。
如图5至图10所示，在本发明的一些具体实施方式中，第一隔圈20和第二隔圈30分别为长条形，第一隔圈20包括：两个第一夹持部22和两个第一连接部23。
具体地，两个第一夹持部22间隔开且相对设置，两个第一夹持部22之间的间隙限定出第一通道21，一个第一连接部23设于两个第一夹持部22的一端并与两个第一夹持部22的一端相连，另一个第一连接部23设于两个第一夹持部22的另一端并与两个第一夹持部22的另一端相连。
第二隔圈30包括：两个第二夹持部和两个第二连接部。两个第二夹持部间隔开且相对设置，两个第二夹持部之间的间隙限定出第二通道31，一个第二连接部设于两个第二夹持部的一端并与两个第二夹持部的一端相连，另一个第二连接部设于两个第二夹持部的另一端并与两个第二夹持部的另一端相连。
由于极芯10的上端装配结构与下端的装配结构相似，下面将以极芯10上端的装配结构为例对第一隔圈20、第一极耳11和第一引出片50的结构进行详细说明。
如图5至图8所示，第一隔圈20外形呈长方体，第一隔圈20主要由两个第一夹持部22和两个第一连接部23组成，两个第一连接部23位移第一隔圈20的两端位置，两个第一连接部23之间设有两个相对布置的第一夹持部22，两个第一夹持部22的一端与同一个第一连接部23相连，两个第一夹持部22的另一端与另一个第一连接部23相连，两个第一夹持部22之间的间隙限定出第一通道21。
根据本发明的一个实施例，第一连接部23为块状，第一连接部23朝向极芯10的一侧凸出于第一夹持部22朝向极芯10的一侧，且第一连接部23相对于第一夹持部22的凸出部分挤压极芯10，第二连接部为块状，第二连接部朝向极芯10的一侧凸出于第二夹持部朝向极芯10的一侧，且第二连接部相对于第二夹持部的凸出部分挤压极芯10。
如图4所示，当第一隔圈20设于极芯10上方，第一隔圈20的下表面朝向极芯10时，第一连接部23的下表面向下延伸超出第一夹持部22的下表面，并且第一连接部23的超出 部分挤压极芯10上第一极耳11两侧的隔膜，第一连接部23挤压隔膜使其边缘回缩的长度为1mm-3mm，该长度可以根据极芯10的设计，依据隔膜超出正极片和负极片的长度来确定，并且同时考虑电池100在封装时的封装尺寸要求及极芯10的膨胀程度。
第一连接部23挤压隔膜，使得正极片、隔膜、负极片三者位置被固定，限制正极片和负极片与隔膜之间的相对运动，减少正极片和负极片边缘与隔膜之间的摩擦，从而降低正极片和负极片的锋利边缘或者毛刺破坏隔膜而导致正负极接触短路的可能性。另外，第一隔圈20和第二隔圈30的两端通过连接件40固定，连接件40与第一隔圈20和第二隔圈30配合，可以在极芯10的宽度方向上固定极芯10，同时拉住第一隔圈20和第二隔圈30，保证正极片和负极片两侧隔膜被压紧。
由此，通过将第一隔圈20和第二隔圈30设置为两端较厚且向外突出、中间位置较薄的结构，较厚的部位可以压紧极芯10的隔膜，使得正极片和负极片的位置固定，从而固定第一极耳11和第二极耳12的引出位置，被压紧的隔膜对第一极耳11和第二极耳12根部形成夹持和支撑，达到控制极耳折弯角的目的，同时被压紧的隔膜能够限制正极片和负极片边缘及第一极耳11和第二极耳12的弯曲或者倒伏，降低极片破坏隔膜完整性而造成正负极短路的可能性。另外，第一隔圈20和第二隔圈30可以将正负极片边缘与铝塑膜隔开，杜绝两者发生接触的可能，防止短路的发生。
在本发明的一些具体实施方式中，第一夹持部22包括第一限位横板221，两个第一夹持部22的两个第一限位横板221的内侧面相对设置且限定出第一通道21；第二夹持部包括第二限位横板，两个第二夹持部的两个第二限位横板的内侧面相对设置且下定出第二通道31。
第一夹持部22还包括第一限位纵板222，第一限位纵板222与第一限位横板221的外侧面相连，且两个第一夹持部22的第一限位纵板222相对设置；第二夹持部还包括第二限位纵板，第二限位纵板与第二限位横板的外侧面相连，且两个第二夹持部的第二限位纵板相对设置，第一限位横板221与第一限位纵板222之间设有多个沿其长度方向间隔开布置的加强筋224，第二限位横板与第二限位纵板之间设有多个沿其长度方向间隔开布置的加强筋。
如图8所示，第一夹持部22由第一限位横板221和第一限位纵板222组成，第一限位纵板222的下边沿与第一限位横板221的外侧面相连，两个第一夹持部22的第一限位横板221的内侧面朝向相对，并且间隔开的间隙限定出第一通道21，两个第一夹持部22的第一限位纵板222朝向相对且互相平行。第一限位横板221与第一限位纵板222之间设有多个加强筋224，多个加强筋224可以互相平行，并且每个加强筋224分别与第一限位横板221和第一限位纵板222相连。
由此，该结构使得第一夹持部22整体形成为从顶面向内镂空的结构，可以减少材料用量，减轻重量；镂空部位添加加强筋224，用于保证第一夹持部22的强度，避免其变形过度导致失效。
根据本发明的一个实施例，第一限位横板221朝向极芯10的一侧表面为第一导向面 223，两个第一导向面223构造为朝向彼此并远离极芯10倾斜延伸的斜面；第二限位横板朝向极芯10的一侧表面为第二导向面，两个第二导向面构造为朝向彼此并远离极芯10倾斜延伸的斜面。
如图3和图4所示，在图3和图4所示状态下，极芯10沿上下方向延伸，第一夹持部22的两个第一限位横板221的下表面均形成为斜面，两个斜面分别从极芯10的两侧向中间位置并背向极芯10倾斜延伸，该斜面结构不仅可以作为第一极耳11的导向面，而且第一隔圈20中间部分开槽给第一极耳11引出空间便于第一极耳11从第一通道21伸出，导向面贴合第一极耳11引出角度(最外层极耳与竖直方向形成的角度)，形成避位角α，避位角可以给第一极耳11增加限位，防止第一极耳11外扩，维持第一极耳11收束的形态，同时第一夹持部22与第一极耳11之间留出间隙，给第一极耳11留出一定的活动空间，可以避免压迫第一极耳11。
需要说明的是，图3和图4所示的示例只是为了方便对于本申请进行说明，并不是限定了极芯10的排布方向，在实际使用过程中，极芯10可以根据实际情况调整排布方向，第一导向面223和第二导向面可以分别从极芯10的两侧向中间位置，沿着极芯10的延伸方向向两端倾斜延伸，从而可以便于极耳导出。
本发明的一些具体实施方式中，第一限位纵板222的外侧面与极芯10的外侧面平行，一个第一导向面223与对应一侧的第一限位纵板222的外侧面之间的夹角为避位角α 1，另一个第一导向面223与对应一侧的第一限位纵板222的外侧面之间的夹角为避位角α 2，一个第一导向面223与对应一侧的第一限位纵板222的外侧面之间的夹角如图4和图8所示，即第一限位横板221与第一限位纵板222相连之后，两者的外表面之间形成的夹角。第一限位纵板222的纵向高度l 1满足：
l 1＝(w 1-1/2g 1)cotα 1+δ＝(w 2-1/2g 1)cotα 2+δ      (1)
其中，w 1为极芯10的位于第一极耳11的一侧的厚度，w 2为极芯10位于第一极耳11的另一侧的厚度，g 1为第一通道的宽度，δ为第一引出片伸入两个第一限位纵板222和第一通道之间的总长度；
第二限位纵板的外侧面与极芯10的外侧面平行，一个第二导向面与对应一侧的第二限位纵板的外侧面之间的夹角为避位角α 3，另一个第二导向面与对应一侧的第二限位纵板的外侧面之间的夹角为避位角α 4，第二限位纵板的纵向高度l 2满足：
l 2＝(w 3-1/2g 2)cotα 3+δ＝(w 4-1/2g 2)cotα 4+δ       (2)
其中，w 3为极芯10的位于第二极耳12的一侧的厚度，w 4为极芯10位于第二极耳12的另一侧的厚度，g 2为第二通道的宽度，δ为第二引出片伸入两个第二限位纵板和第二通道之间的总长度。
以第一极耳11为例，由于极耳引出的位置不一定在极芯厚度的正中间，有可能偏向一侧大面，针对于非正中间引出的结构，隔圈两侧的避位角α 1和α 2是不相等的，因为两侧分配到的极芯的厚度w 1和w 2不相等。
当第一极耳11与与极芯10的中线重合时，w 1＝w 2，且α 1＝α 2，
l 1＝1/2(w-g 1)cotα 1+δ，其中，w为极芯10的厚度，α 1为一个第一导向面223与对应一侧的第一限位纵板222的外侧面之间的夹角，g 1为第一通道的宽度；
当第二极耳12位于与极芯10的中线重合时，w 3＝w 4，且α 3＝α 4，
l 2＝1/2(w-g 2)cotα 3+δ，其中，w为极芯10的厚度，α 3为一个第二导向面与对应一侧的第二限位纵板的外侧面之间的夹角，g 2为第二通道的宽度。
即当第一极耳11位于极芯厚度的正中间位置时，w 1和w 2相等，w1+w2＝w，w为极芯的总厚度，α 1和α 2也相等可表示为α，此时，第一极耳11的长度l＝1/2(w-g 1)cotα+δ。
另外，考虑到第一隔圈20内的第一通道21与第二隔圈30内的第二通道31的宽度也有差别，因此，第一限位纵板与第二限位纵板的长度可以根据第一通道21与第二通道31的宽度分别进行计算。
电池100还包括：密封片70，密封片70设于第一引出片50和第二引出片60的外周，密封片70的一部分伸入第一隔圈20或第二隔圈30；δ满足：
x≤δ≤x+y+z      (3)
其中，x为第一极耳11与第一引出片50重合连接的长度或第二极耳12与第二引出片60重合连接的长度，y为密封片70与相对应的第一极耳11或第二极耳12之间的距离，z为密封片70伸入第一隔圈20或第二隔圈30的长度。
另外，δ的数值大小由第一隔圈20的材料性质、设计结构强度及第一隔圈20中所容纳第一极耳11与第一引出片50的连接工艺决定。
由此，根据本发明实施例的电池100，通过对极芯支撑结构进行设计，形成了极耳保护空间，对极耳自由活动进行了限制，有助于维持极耳状态的稳定，防止集流体的破坏和多种短路情况的发生。
如图9和图10所示，根据本发明的一个实施例，第一隔圈20的两端分别设有第一安装部25，第二隔圈30的两端分别设有第二安装部，连接件40为两个，每个连接件40分别为片状，且每个连接件40的两端分别设有第三安装部41，第三安装部41与第一安装部25和第二安装部可拆卸地相连。
第一安装部25为设于第一隔圈20的两端的凸柱，第二安装部为设于第二隔圈30的两端的凸柱，连接件40为片状，第三安装部41为与凸柱对应的安装孔。
由此，通过在第一隔圈20的两端设置凸柱结构，连接件40设为片状，并且两端各开有开孔，分别用于与第一隔圈20和第二隔圈30相连，该设计结构简单，成本低廉，而且装配方便，稳定性高。
尽管已经示出和描述了本申请的实施例，本领域的普通技术人员可以理解：在不脱离本申请的原理和宗旨的情况下可以对这些实施例进行多种变化、修改、替换和变型，本申请的范围由权利要求及其等同物限定。

Claims (11)

  1. 一种电池，其特征在于，包括：
    极芯，所述极芯的一端设有第一极耳，所述极芯的另一端设有第二极耳；
    第一隔圈，所述第一隔圈设于所述极芯的一端，所述第一隔圈设有供所述第一极耳通过的第一通道；
    第二隔圈，所述第二隔圈设于所述极芯的另一端，所述第二隔圈设有供电池的第二极耳通过的第二通道；
    连接件，所述连接件与所述第一隔圈和所述第二隔圈相连以固定所述第一隔圈和所述第二隔圈；
    第一引出片和第二引出片，所述第一引出片的一部分伸入所述第一通道与所述第一极耳相连，所述第二引出片的一部分伸入所述第二通道与所述第二极耳相连。
  2. 根据权利要求1所述的电池，其特征在于，所述极芯的上端设有所述第一极耳，所述极芯的下端设有所述第二极耳，所述第一隔圈与所述第二隔圈相对设置且结构相同。
  3. 根据权利要求1或2所述的电池，其特征在于，所述第一隔圈和所述第二隔圈分别为长条形，所述第一隔圈包括：
    两个第一夹持部，两个所述第一夹持部间隔开且相对设置，两个所述第一夹持部之间的间隙限定出所述第一通道；
    两个第一连接部，一个所述第一连接部设于两个所述第一夹持部的一端并与两个所述第一夹持部的一端相连，另一个所述第一连接部设于两个所述第一夹持部的另一端并与两个所述第一夹持部的另一端相连；
    所述第二隔圈包括：
    两个第二夹持部，两个所述第二夹持部间隔开且相对设置，两个所述第二夹持部之间的间隙限定出所述第二通道；
    两个第二连接部，一个所述第二连接部设于两个所述第二夹持部的一端并与两个所述第二夹持部的一端相连，另一个所述第二连接部设于两个所述第二夹持部的另一端并与两个所述第二夹持部的另一端相连。
  4. 根据权利要求3所述的电池，其特征在于，所述第一夹持部包括第一限位横板，两个所述第一夹持部的所述第一限位横板的内侧面相对设置且限定出所述第一通道；
    所述第二夹持部包括第二限位横板，两个所述第二夹持部的所述第二限位横板的内侧面相对设置且限定出所述第二通道。
  5. 根据权利要求4所述的电池，其特征在于，所述第一限位横板朝向所述极芯的一侧表面为第一导向面，两个所述第一导向面构造为朝向彼此并远离所述极芯倾斜延伸的斜面；
    所述第二限位横板朝向所述极芯的一侧表面为第二导向面，两个所述第二导向面构造为朝向彼此并远离所述极芯倾斜延伸的斜面。
  6. 根据权利要求4所述的电池，其特征在于，所述第一夹持部还包括第一限位纵板，所述第一限位纵板与所述第一限位横板的外侧面相连，且两个所述第一夹持部的所述第一限位纵板相对设置；
    所述第二夹持部还包括第二限位纵板，所述第二限位纵板与所述第二限位横板的外侧面相连，且两个所述第二夹持部的所述第二限位纵板相对设置，所述第一限位横板与所述第一限位纵板之间设有多个沿其长度方向间隔开布置的加强筋，所述第二限位横板与所述第二限位纵板之间设有多个沿其长度方向间隔开布置的加强筋。
  7. 根据权利要求6所述的电池，其特征在于，所述第一限位纵板的外侧面与所述极芯的外侧面平行，一个所述第一导向面与对应一侧的所述第一限位纵板的外侧面之间的夹角为避位角α 1，另一个所述第一导向面与对应一侧的所述第一限位纵板的外侧面之间的夹角为避位角α 2，所述第一限位纵板的纵向高度l 1满足：
    l 1＝(w 1-1/2g 1)cotα 1+δ＝(w 2-1/2g 1)cotα 2+δ  (1)
    其中，w 1为所述极芯的位于所述第一极耳的一侧的厚度，w 2为所述极芯的位于所述第一极耳的另一侧的厚度，g 1为所述第一通道的宽度，δ为所述第一引出片伸入两个所述第一限位纵板和所述第一通道之间的总长度；
    所述第二限位纵板的外侧面与所述极芯的外侧面平行，一个所述第二导向面与对应一侧的所述第二限位纵板的外侧面之间的夹角为避位角α 3，另一个所述第二导向面与对应一侧的所述第二限位纵板的外侧面之间的夹角为避位角α 4，所述第二限位纵板的纵向高度l 2满足：
    l 2＝(w 3-1/2g 2)cotα 3+δ＝(w 4-1/2g 2)cotα 4+δ  (2)
    其中，w 3为所述极芯的位于所述第二极耳的一侧的厚度，w 4为所述极芯的位于所述第二极耳的另一侧的厚度，g 2为所述第二通道的宽度，δ为所述第二引出片伸入两个所述第二限位纵板和所述第二通道之间的总长度。
  8. 根据权利要求7所述的电池，其特征在于，当所述第一极耳与所述极芯的中线重合时，w 1＝w 2，且α 1＝α 2，l 1＝1/2(w-g 1)cotα 1+δ，
    其中，w为所述极芯的厚度，α 1为一个所述第一导向面与对应一侧的所述第一限位纵板的外侧面之间的夹角，g 1为所述第一通道的宽度；
    当所述第二极耳位于所述极芯的中线重合时，w 3＝w 4，且α 3＝α 4，
    l 2＝1/2(w-g 2)cotα 3+δ，
    其中，w为所述极芯的厚度，α 3为一个所述第二导向面与对应一侧的所述第二限位纵板的外侧面之间的夹角，g 2为所述第二通道的宽度。
  9. 根据权利要求1-8中任一项所述的电池，其特征在于，所述电池还包括：密封片，所述密封片设于所述第一引出片和所述第二引出片的外周，所述密封片的一部分伸入所述第一隔圈或所述第二隔圈；所述δ满足：
    x≤δ≤x+y+z  (3)
    其中，x为所述第一极耳与所述第一引出片重合连接的长度或所述第二极耳与所述第二 引出片重合连接的长度，y为所述密封片与相对应的所述第一极耳或所述第二极耳之间的距离，z为所述密封片伸入所述第一隔圈或所述第二隔圈的长度。
  10. 根据权利要求3所述的电池，其特征在于，所述第一连接部为块状，所述第一连接部朝向所述极芯的一侧凸出于所述第一夹持部朝向所述极芯的一侧，且所述第一连接部相对于所述第一夹持部的凸出部分挤压所述极芯；
    所述第二连接部为块状，所述第二连接部朝向所述极芯的一侧凸出于所述第二夹持部朝向所述极芯的一侧，且所述第二连接部相对于所述第二夹持部的凸出部分挤压所述极芯。
  11. 根据权利要求1-10中任一项所述的电池，其特征在于，所述第一隔圈的两端分别设有第一安装部，所述第二隔圈的两端分别设有第二安装部，所述连接件为两个，每个所述连接件分别为片状，且所述连接件的两端分别设有第三安装部，所述第三安装部与所述第一安装部和所述第二安装部可拆卸地相连。
PCT/CN2021/089033 2020-12-04 2021-04-22 电池 WO2022116469A1 (zh)

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