CN215815997U - Battery cell and lithium ion battery - Google Patents

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a battery cell and a lithium ion battery. Wherein, electric core includes the laminate body, anodal piece that converges, negative pole piece and insulating gasket converge, through turning over each positive plate utmost point ear according to the preface overlap joint, turn over the positive plate utmost point ear in the outside again and turn over the back and be connected with the anodal piece that converges, turn over each negative pole piece utmost point ear according to the preface overlap joint to through the negative plate utmost point ear in the outside and the negative pole piece that converges and be connected, area of contact increase between each positive plate utmost point ear, each negative pole piece utmost point ear, the ability reinforcing that overflows, thereby make its multiplying power performance promote. In addition, set up insulating pad between overlap joint portion, bus bar piece and connecting portion, insulating pad can avoid the burr on overlap joint portion, bus bar piece and the connecting portion to influence each other, avoids the burr to pierce through utmost point ear or bus bar piece, produces harmful effects to the performance of electric core.

Description

Battery cell and lithium ion battery

Technical Field

The utility model belongs to the technical field of batteries, and particularly relates to a battery cell and a lithium ion battery.

Background

In the process of manufacturing the lithium ion battery, the pole piece is firstly subjected to die cutting, partial blank foil is cut at the end part of the pole piece to serve as a pole lug, the pole lug overcurrent capacity of each pole piece is limited, the requirement of the power battery on high-rate performance in the current market is difficult to meet, and the contact resistance is increased due to the fact that a pole lug bonding welding agent is easy to appear in the multi-layer pole lug welding process, so that the overcurrent capacity of the pole lug is reduced, the internal resistance of the battery is increased, the high-power application of the battery is influenced, and the use safety performance of a product is difficult to improve.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model aims to provide a battery cell and a lithium ion battery, and aims to solve the technical problems that in the prior art, the overcurrent capacity of each pole piece tab in a battery pack is limited, and the safety performance requirement of the battery cannot be met.

In order to achieve the purpose, the utility model adopts the technical scheme that: a battery cell comprises a laminated body, a positive pole bus bar, a negative pole bus bar and an insulating gasket, wherein the laminated body comprises a plurality of positive pole pieces, a plurality of diaphragms and a plurality of negative pole pieces which are sequentially laminated, each positive pole piece is provided with a positive pole piece lug positioned at one end of the laminated body, and each negative pole piece is provided with a negative pole piece lug positioned at the other end of the laminated body; wherein, along the height direction of the laminated body

The positive plate tabs are turned over in the same direction and are mutually overlapped to form a positive electrode overlapping part, the end part of the positive plate tab positioned at the outermost side of the laminated body is turned over towards the opposite side to form a positive electrode connecting part, the positive electrode confluence sheet and the positive electrode overlapping part are arranged in parallel at intervals and are connected with the positive electrode connecting part, and insulating gaskets are clamped between the positive electrode connecting part and the positive electrode overlapping part and between the positive electrode confluence sheet and the positive electrode overlapping part;

the positive plate tabs are turned over in the same direction and are mutually overlapped to form a negative electrode overlapping portion, the end portion of the positive plate tab positioned on the outermost side of the laminated body is turned over towards the opposite side to form a negative electrode connecting portion, the negative electrode confluence piece and the negative electrode overlapping portion are arranged in parallel at intervals and are connected with the negative electrode connecting portion, and insulating gaskets are arranged between the negative electrode connecting portion and the negative electrode overlapping portion and between the negative electrode confluence piece and the negative electrode overlapping portion in a clamping mode.

By adopting the technical scheme, the positive plate lugs are sequentially folded and overlapped, and then the positive plate lugs on the outermost side are folded and connected with the positive bus bar piece, so that all the positive plates are ensured to be converged by the positive bus bar piece, similarly, the negative plate lugs are sequentially folded and overlapped, and are connected with the negative bus bar piece through the negative plate lugs on the outermost side for convergence, the contact area between the positive (negative) plate lugs is increased, the overcurrent capacity is enhanced, and the multiplying power performance is improved. In addition, set up insulating pad between overlap joint portion, bus bar piece and connecting portion, insulating pad can avoid the burr on overlap joint portion, bus bar piece and the connecting portion to influence each other, avoids the burr to pierce through utmost point ear or bus bar piece, produces harmful effects to the performance of electric core.

In some embodiments, one end of the positive plate is a positive coating area coated with the positive dressing, the other opposite end is a blank positive blank area, and the blank positive area forms a positive plate tab; one end of the negative plate is a negative coating area covered with negative dressing, the other opposite end is a blank negative blank area, and a negative plate tab is formed in the blank negative area.

Through adopting foretell technical scheme, reserve the blank area of not coating anodal coating in the one end of positive plate, reserve the blank area of not coating negative pole coating in the one end of negative pole piece, and do not carry out the cross cutting processing to the blank area of positive plate and negative pole piece, and direct with the current-leading utmost point ear (being full utmost point ear) as positive plate and negative pole piece respectively in whole positive blank area and the blank area of negative pole, compare the little utmost point ear after the cross cutting, the area of overflowing of full utmost point ear increases, the current capacity reinforcing, better rate capability has. Moreover, when the laminated body is manufactured, the lamination alignment of the current-guiding lugs can be realized by aligning the pole pieces, the alignment condition of the lugs does not need to be considered additionally, and the lamination operation is simpler and more efficient. The blank areas of the positive plate and the negative plate can be subjected to die cutting treatment, the purpose of the scheme can be achieved, too much limitation is not needed, and the blank areas can be selected according to actual needs during use.

In some embodiments, the positive bus bar comprises a positive connecting section and a positive switching section connected to one end of the positive connecting section, the positive connecting section is arranged opposite to the positive overlapping part at intervals and connected with the positive connecting part, the positive switching section extends to exceed the laminated body along the height direction of the laminated body, and the positive switching section is used for being connected with an external electric connecting structure;

the negative pole busbar piece includes negative pole linkage segment and connects in the negative pole changeover portion of negative pole linkage segment one end, and the negative pole linkage segment just sets up and is connected with negative pole connecting portion with the negative pole overlap joint portion at the interval, and the negative pole changeover portion extends to surpassing the lamination along the direction of height of lamination, and the negative pole changeover portion is used for linking to each other with outside electric connection structure.

By adopting the technical scheme, the positive pole bus bar and the negative pole bus bar are connected with the external electric connection structure along the height direction of the laminated body and the part exceeding the laminated body, so that the connection structure is simple, the connection operation is not influenced by the drainage lugs of the pole pieces in the laminated body, and the operation is convenient.

In some embodiments, the positive connection section is welded to the positive connection portion and the negative connection section is welded to the negative connection portion.

By adopting the technical scheme, the connection operation between the positive electrode connecting section and the positive electrode connecting part and between the negative electrode connecting section and the negative electrode connecting part is simple, and the connection stability and reliability are better.

In some embodiments, the turning direction of the positive electrode blank region is the same as the turning direction of the negative electrode blank region, and the direction of the end of the positive electrode connecting portion is the same as the direction of the end of the negative electrode connecting portion in the height direction of the laminate.

By adopting the technical scheme, when the laminated body is manufactured, the blank areas of the pole pieces are turned over in the same direction by adopting the same equipment or tooling, the positive electrode connecting part and the negative electrode connecting part are welded with the corresponding positive electrode bus piece and the corresponding negative electrode bus piece in the same direction, and the process is simple and easy to process.

In some embodiments, in the height direction of the laminate, the turning direction of the positive electrode blank region is opposite to the turning direction of the negative electrode blank region, and the end of the positive electrode connecting portion faces opposite to the end of the negative electrode connecting portion.

By adopting the technical scheme, the positive electrode connecting part and the negative electrode connecting part can be respectively welded with the corresponding positive electrode bus bar piece and the corresponding negative electrode bus bar piece in different directions, and during processing, the processing technology and the arrangement and the setting of the processing position can be carried out according to the actual condition of the technology, so that the processing operation is more flexible and changeable, and the applicability is stronger.

In some embodiments, the insulating spacer is any one of a tape sheet, a rubber sheet, a fiber sheet, and a glass sheet.

Through adopting foretell technical scheme, the insulating pad of above-mentioned material can avoid the inside short circuit of electric core, can extrude the flattening burr again to, insulating pad texture is frivolous, draws materials extensively, can not too greatly increase overall structure's volume and cost of manufacture.

One or more technical solutions in the battery cell provided by the utility model at least have one of the following technical effects: according to the cell, the positive plate lugs are sequentially turned over and overlapped, and the positive plate lugs on the outermost side are turned over and then connected with the positive bus plate, so that all the positive plates are ensured to be converged by the positive bus plate. In addition, set up insulating pad between overlap joint portion and bus bar and connecting portion, insulating pad can avoid overlap joint portion and bus bar and connecting portion on burr interact, avoids the burr to pierce through utmost point ear or bus bar, produces harmful effects to the performance of electric core.

The other technical scheme of the utility model is as follows: the utility model provides a lithium ion battery, includes casing and foretell electric core, and the inside cavity of casing is formed with and holds the chamber, and the casing is equipped with first opening and the second opening that supplies positive pole piece, negative pole piece to stretch out of converging. Through adopting foretell technical scheme, when making lithium ion battery, arrange foretell electric core in the intracavity that holds of casing, set up first opening and second opening on the casing, supply positive pole piece and the negative pole piece of converging to stretch out respectively, the electric core again through this extension with the outside electric connection structural connection of casing can, lithium ion battery overall structure is hardly influenced by the electric core structural change.

In some embodiments, the first opening and the second opening are located on the same side of the housing, or the first port and the second opening are located on different sides of the housing.

Through adopting foretell technical scheme, to hookup location's different demands when using the electricity structure power consumption, can set up anodal bus bar and negative pole bus bar and stretch out with one side of casing, also can set to stretch out from the different sides of casing, the setting of electric connection location is more nimble, and the suitability is stronger.

One or more technical schemes in the lithium ion battery provided by the utility model at least have one of the following technical effects: set up foretell electric core in lithium ion battery's casing, the current-carrying area increase of battery, the multiplying power performance improves, and the wholeness ability of battery can promote.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a battery cell according to an embodiment of the present invention;

fig. 2 is an overall cut-away view of the cell shown in fig. 1;

fig. 3 is a partial cutaway view one of the cells shown in fig. 1;

fig. 4 is a second partial cross-sectional view of the cell shown in fig. 1;

fig. 5 is a front view of a positive electrode tab (negative electrode tab) of the cell shown in fig. 1;

fig. 6 is a schematic structural diagram of a lithium ion battery according to another embodiment of the present invention;

fig. 7 is a schematic structural diagram of a housing of the lithium ion battery shown in fig. 6;

fig. 8 is a schematic structural view of the lithium ion battery shown in fig. 6 when the case is press-sealed from the left and right sides;

fig. 9 is a schematic structural view of the case of the lithium ion battery shown in fig. 6, which is press-sealed from both upper and lower end surfaces.

Wherein, in the figures, the respective reference numerals:

10. a laminate; 100. an electric core; 11. a positive plate; 111. a positive electrode blank area; 112. a positive electrode coating region; 113. a positive electrode lap joint part; 114. a positive electrode connecting part; 12. a diaphragm; 13. a negative plate; 131. a negative electrode blank area; 132. a negative electrode coating region; 133. a negative electrode overlapping part; 134. a negative electrode connecting part; 20. a positive bus bar; 21. a positive electrode connecting section; 22. a positive electrode switching section; 30. a negative bus bar; 31. a negative electrode connecting section; 32. a negative electrode switching section; 40. an insulating spacer; 200. a housing; 201. a first opening; 202. a second opening; 203. and (7) edge sealing.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to fig. 1 to 9 and the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "left," "right," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be constructed in a particular operation, and are therefore not to be considered limiting.

Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

As shown in fig. 1 to 5, an embodiment of the utility model provides a battery cell 100, which includes a laminated body 10, a positive bus bar 20, a negative bus bar 30, and an insulating spacer 40, where the laminated body 10 includes a plurality of positive bus bars 11, a plurality of separators 12, and a plurality of negative bus bars 13, which are sequentially laminated. Specifically, as shown in fig. 1 and 2, in the present embodiment, the laminate 10 is formed by stacking the separator 12, the positive electrode sheet 11, the separator 12, the negative electrode sheet 13, the separator 12, and the positive electrode sheet 11 in this order from bottom to top.

Further, in the present embodiment, as shown in fig. 2 to 4, in the height direction of the laminated body 10, the positive electrode tab tabs are sequentially folded in the same direction and overlapped with each other to form the positive electrode overlapping portion 113, the end portion of the positive electrode tab located at the outermost side of the laminated body 10 is folded in the opposite direction to form the positive electrode connecting portion 114, as shown in fig. 2, the positive electrode tab tabs are all folded and overlapped with each other toward the bottom of the laminated body 10, the positive electrode tab of one positive electrode tab 11 located at the bottommost side of the laminated body 10 is folded toward the top of the laminated body 10 to form the positive electrode connecting portion 114, the positive electrode bus bar 20 is disposed in parallel with the positive electrode overlapping portion 113 at an interval and connected to the positive electrode connecting portion 114, the insulating gasket 40 is interposed between the positive electrode connecting portion 114 and the positive electrode overlapping portion 113 and between the positive electrode bus bar 20 and the positive electrode overlapping portion 113, and the positive electrode bus bar 20 forms the positive electrode tab of the laminated body 10. Similarly, in the height direction of the laminate 10, the negative electrode tabs are sequentially folded in the same direction and overlapped with each other to form a negative electrode overlapping portion 133, the end portion of the negative electrode tab located at the outermost side of the laminate 10 is folded in the opposite direction to form a negative electrode connecting portion 134, as shown in fig. 2, the negative electrode tabs are all folded and overlapped toward the bottom of the laminate 10, the negative electrode tab of the negative electrode tab 13 located at the bottommost side of the laminate 10 is folded toward the top of the laminate 10 to form a negative electrode connecting portion 134, the negative electrode bus bar 30 and the negative electrode overlapping portion 133 are arranged in parallel at an interval and connected to the negative electrode connecting portion 134, an insulating spacer 40 is interposed between the negative electrode connecting portion 134 and the negative electrode overlapping portion 133, and the negative electrode bus bar 30 forms the negative electrode tab of the laminate 10.

Like this, turn over the overlap joint with each positive plate utmost point ear according to the preface, turn over the positive plate utmost point ear in the outside again and turn over the back and be connected with positive pole confluence piece 20, thereby ensure that each positive plate 11 all converges through positive pole confluence piece 20, and is similar, each negative pole piece utmost point ear overlap joint, and converge with negative pole confluence piece 30 through the negative pole piece utmost point ear in the outside connection, establish through the overlap joint subsides between each positive plate 11 and between each negative pole piece 13 and connect and form the electrical property and switch on, need not to weld the drainage utmost point ear of each pole piece, thereby can avoid appearing the condition emergence that drainage utmost point ear bonding welding agent leads to the contact to prevent the increase, the area of contact between each positive (negative) pole piece utmost point ear increases, the overcurrent capacity reinforcing, multiplying power performance promotes. In addition, set up insulating pad 40 between overlap joint portion, bus bar piece and connecting portion, insulating pad 40 can avoid the burr on overlap joint portion, bus bar piece and the connecting portion to influence each other, avoids the burr to pierce through utmost point ear or bus bar piece, produces harmful effects to electric core 100's performance.

In the related technology, in the process of manufacturing the lithium ion battery, the pole piece is subjected to die cutting, a small part of blank foil is cut at the end part of the pole piece to serve as a pole lug, and because the pole lug of each pole piece has limited overcurrent capacity, the increase of the overcurrent capacity is very limited even if the pole lug is connected by adopting the connection mode, and the power battery with higher rate performance requirement can still not meet the requirement.

In view of this, in another embodiment of the present invention, as shown in fig. 5, one end of the positive electrode sheet 11 is a positive electrode coating area 112 coated with a positive electrode dressing, and the opposite end is a blank positive electrode area 111, and the blank positive electrode area 111 forms a positive electrode sheet tab; one end of the negative electrode sheet 13 is a negative electrode coating area 132 coated with a negative electrode dressing, the other opposite end is a blank negative electrode space 131, and the blank negative electrode space 131 forms a negative electrode sheet tab. That is, one end of the positive electrode sheet 11 is a positive electrode coating region 112 coated with a positive electrode coating material, the other end is a blank positive electrode region 111 coated with a blank non-coating material, one end of the negative electrode sheet 13 is a negative electrode coating region 132 coated with a negative electrode material, and the other end is a blank negative electrode region 131 coated with a blank non-coating material, and when the positive electrode sheets 11 are stacked to form a stacked body, the blank positive electrode regions 111 of the positive electrode sheets 11 are located at the same end of the stacked body 10, and the blank negative electrode regions 131 of the negative electrode sheets 13 are located at the opposite end of the stacked body 10. Like this, reserve the blank area of not coating paint in positive plate 11 and negative pole piece 13's one end respectively to do not carry out the cross cutting processing to positive plate 11 and negative pole piece 13's blank area, and directly regard as positive plate 11 and negative pole piece 13's drainage utmost point ear (being full utmost point ear) respectively with whole anodal blank 111 and negative pole blank 131, compare the little utmost point ear after the cross cutting, the area of overflowing of full utmost point ear increases, and the current capacity reinforcing has better rate performance. Moreover, when the laminated body 10 is manufactured, the lamination alignment of the current-guiding tabs can be realized by aligning each pole piece, the alignment condition of each tab does not need to be considered additionally, and the lamination operation is simpler and more efficient.

In another embodiment of the present invention, as shown in fig. 1, when the positive bus bar 20 is connected to the positive connection part 114 and the negative bus bar 30 is connected to the negative connection part 134 along the thickness direction of the laminate 10, respectively, the width of the positive bus bar 20 is greater than or equal to the width of the positive blank space 111, and the width of the negative bus bar 30 is greater than or equal to the width of the negative blank space 131; when the positive electrode bus bar 20 is connected to the positive electrode connecting portion 114 and the negative electrode bus bar 30 is connected to the negative electrode connecting portion 134 in the width direction of the laminate 10, respectively, the width of the positive electrode bus bar 20 is greater than or equal to the thickness of the laminate 10, and the width of the negative electrode bus bar 30 is greater than or equal to the thickness of the laminate 10. In this way, the drainage tab of the positive plate 11 is in full-area contact with the positive bus bar 20, and similarly, the drainage tab of the negative plate 13 is also in full-area contact with the negative bus bar 30, so that full-area bus is realized, the bus area is the largest, the current-carrying capacity is the strongest, and the requirement of high-rate performance of the battery can be better met.

In another embodiment of the present invention, as shown in fig. 2 to 4, the positive electrode bus bar 20 includes a positive electrode connecting section 21 and a positive electrode connecting section 22 connected to one end of the positive electrode connecting section 21, the positive electrode connecting section 21 is disposed opposite to and spaced from the positive electrode overlapping portion 113 and connected to the positive electrode connecting portion 114, and the positive electrode connecting section 22 extends beyond the laminated body 10 in the height direction of the laminated body 10; the negative bus bar 30 includes a negative connection segment 31 and a negative connection segment 32 connected to one end of the negative connection segment 31, the negative connection segment 31 is opposite to the negative overlapping portion 133 and is connected to the negative connection portion 134, the negative connection segment 32 extends to beyond the stacked body 10 along the height direction of the stacked body 10, the negative connection segment 32 is used for being connected to an external electrical connection structure, and the positive connection segment 22 is used for being connected to the external electrical connection structure, as shown in fig. 1. In the height direction of the laminated body 10, the positive electrode bus bar 20 and the negative electrode bus bar 30 are used for being connected with an external electric connection structure along the part exceeding the laminated body 10, the connection structure is simple, the connection operation is not influenced by the drainage tabs of the pole pieces in the laminated body 10, and the operation is convenient.

In another embodiment of the present invention, the positive electrode connecting section 21 is welded to the positive electrode connecting part 114, and the negative electrode connecting section 31 is welded to the negative electrode connecting part 134. The connection is carried out by adopting a welding mode, the connection operation between the positive electrode connecting section 21 and the positive electrode connecting part 114 and between the negative electrode connecting section 31 and the negative electrode connecting part 134 is simple, and the connection stability and reliability are better.

In some specific embodiments, the connection can be performed by ultrasonic welding, a heat affected zone during welding is small, welding stress and deformation are small, a welding effect is good, and connection is reliable.

In another embodiment of the present invention, as shown in fig. 2, the positive electrode blank space 111 may be folded in the same direction as the negative electrode blank space 131 in the height direction of the laminate 10, and in this case, the end of the positive electrode connecting portion 114 may be oriented in the same direction as the end of the negative electrode connecting portion 134. In this way, when manufacturing the laminated body 10, the blank regions of the respective pole pieces may be folded in the same direction by using the same equipment or tool, and the positive electrode connecting portion 114 and the negative electrode connecting portion 134 are welded to the corresponding positive electrode bus bar 20 and the corresponding negative electrode bus bar 30 in the same direction, which is simple in process and easy to process.

Of course, in other embodiments, the positive electrode blank space 111 may be folded in a direction opposite to the negative electrode blank space 131 (not shown) in the height direction of the laminate 10, and in this case, the end of the positive electrode connecting portion 114 may face in a direction opposite to the end of the negative electrode connecting portion 134. In this way, the positive electrode connecting portion 114 and the negative electrode connecting portion 134 may be welded to the corresponding positive electrode bus bar 20 and the corresponding negative electrode bus bar 30 in different directions, and during machining, the machining process and the arrangement and setting of the machining position may be performed according to the actual conditions of the process, so that the machining operation is more flexible and variable, and the applicability is higher.

In another embodiment of the present invention, the insulating spacer 40 is any one of a tape sheet, a rubber sheet, a fiber sheet, and a glass sheet. The insulating spacer 40 of above-mentioned material can avoid the inside short circuit of electricity core 100, can extrude flattening negative pole blank 131 and anodal blank 111 (the drainage utmost point ear of pole piece promptly) again to and the burr on anodal conflux piece 20 and the negative pole piece 30, and, insulating spacer 40 texture is frivolous, draws materials extensively, can not too greatly increase overall structure's volume and cost of manufacture.

As shown in fig. 6 to 9, another embodiment of the present invention further provides a lithium ion battery, the lithium ion battery casing 200 and the battery cell 100, wherein the casing 200 may be an aluminum-plastic film casing or other metal casing, a hollow accommodating cavity (not shown) is formed inside the casing 200, the accommodating cavity is adapted to accommodate the battery cell 100, a first opening 201 and a second opening 202 are provided at two ends of the casing 200, wherein the first opening 201 is used for the positive bus bar 20 to extend out, the second opening 202 is used for the negative bus bar 30 to extend out, when the battery cell 100 is installed in the accommodating cavity of the casing 200, one end of the positive bus bar 20, that is, the positive switching segment 22, extends out from the first opening 201, and one end of the negative bus bar 30, that is, the negative switching segment 32, extends out from the second opening 202.

The lithium ion battery of this embodiment, when manufacturing, firstly, the above-mentioned casing 200 and the battery cell 100 are manufactured respectively, when the casing 200 is manufactured, a first opening 201 and a second opening 202 are reserved in advance on two sides of the casing 200, as shown in fig. 6, after the battery cell 100 is assembled, the battery cell 100 is installed in the accommodating cavity of the casing 200, so that one end of the positive current collecting piece 20 extends out from the first opening 201, one end of the negative current collecting piece 30 extends out from the second opening 202, and the extending portions respectively act on the positive tab and the negative tab of the lithium ion battery of this embodiment. After the battery cell 100 is installed in the casing 200, the tabs of the battery cell 100 are thermally pressed and sealed, during sealing, two side faces of the casing 200 can be sealed at one side first, liquid injection and air exhaust are reserved at the other side for use, and after the grading formation of the battery is finished, the other side is thermally pressed and sealed to form a complete lithium ion battery.

In the present embodiment, when the casing 200 is sealed, the casing 200 may be press-sealed from both left and right sides of the casing 200 to form the edge seal 203, as shown in fig. 8, in which the battery cell 100 is inserted into the casing 200 from the left or right side of the casing 200; the edge seals 203 may be formed by press-sealing both upper and lower end surfaces of the casing 200, as shown in fig. 9, in this case, the battery cells 100 are mounted in the casing 200 from the upper side or the lower side of the casing 200, and the form of the casing 200 enclosing the battery cells is not affected by the use of the battery cells 100.

Thus, when the lithium ion battery is manufactured, the battery cell 100 is placed in the accommodating cavity of the casing 200, the casing 200 is provided with the first opening 201 and the second opening 202, the positive bus bar 20 and the negative bus bar 30 extend out respectively, the battery cell 100 is connected with the electrical connection structure outside the casing 200 through the extending part, and the overall structure of the lithium ion battery is hardly influenced by structural changes of the battery cell 100. In addition, the battery core 100 is arranged in the shell 200 of the lithium ion battery, so that the current carrying area of the battery is increased, the multiplying power performance is improved, and the overall performance of the battery is improved.

In this embodiment, as shown in fig. 7, the shape of the positive pole adapter 22 may be designed to be matched with the shape of the first opening 201, and the shape of the negative pole adapter 32 may be designed to be matched with the shape of the second opening 202, so as to ensure that the positive pole adapter 22 and the negative pole adapter 32 can just protrude from the first opening 201 and the second opening 202, and will not interfere with the openings, and at the same time, the opening sizes of the first opening 201 and the second opening 202 can be fully utilized, so as to ensure the current carrying capacity of the bus bar as much as possible.

In another embodiment of the present invention, the first opening 201 and the second opening 202 are located on the same side of the housing 200, as shown in fig. 7, or the first opening 201 and the second opening 202 are located on different sides of the housing 200 (not shown). Thus, according to different requirements on the connection position when the power structure is used, the positive bus bar 20 and the negative bus bar 30 can be arranged to extend out from the same side of the shell 200, and can also be arranged to extend out from different sides of the shell 200, so that the electric connection position is more flexible to set, and the applicability is stronger.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (9)

1. An electric core is characterized by comprising a laminated body, a positive pole bus bar, a negative pole bus bar and an insulating gasket, wherein the laminated body comprises a plurality of positive pole pieces, a plurality of diaphragms and a plurality of negative pole pieces which are sequentially laminated, each positive pole piece is provided with a positive pole piece tab positioned at one end of the laminated body, and each negative pole piece is provided with a negative pole piece tab positioned at the other end of the laminated body; wherein the thickness of the laminate is set in the height direction

The positive plate tabs are turned over in the same direction and are mutually overlapped to form a positive electrode overlapping part, the end parts of the positive plate tabs positioned on the outermost side of the laminated body are turned over towards the opposite side to form a positive electrode connecting part, the positive electrode bus bar and the positive electrode overlapping part are arranged in parallel at intervals and are connected with the positive electrode connecting part, and the insulating gaskets are clamped between the positive electrode connecting part and the positive electrode overlapping part and between the positive electrode bus bar and the positive electrode overlapping part;

each positive plate tab turns over to the same direction and laps each other and form negative pole overlap joint portion, is located the lamination body outside the tip of positive plate tab turns over to form negative pole connecting portion towards relative opposite side, negative pole converge piece with negative pole overlap joint portion parallel interval sets up and with negative pole connecting portion are connected, the negative pole connecting portion with between the negative pole overlap joint portion, the negative pole converge piece with press from both sides between the negative pole overlap joint portion and be equipped with the insulating pad.

2. The battery cell of claim 1, wherein one end of the positive plate is a positive coating area coated with a positive dressing, and the other opposite end is a blank positive blank area, and the blank positive area forms the positive plate tab; one end of the negative plate is a negative coating area coated with a negative dressing, the other opposite end of the negative plate is a blank negative blank area, and the blank negative plate area forms a negative plate tab.

3. The battery cell of claim 2, wherein the positive bus bar comprises a positive connecting section and a positive transition section connected to one end of the positive connecting section, the positive connecting section is opposite to and spaced from the positive overlapping portion and connected to the positive connecting portion, the positive transition section extends beyond the laminated body along the height direction of the laminated body, and the positive transition section is used for being connected to an external electrical connection structure;

the negative pole busbar piece includes negative pole linkage segment and connects in the negative pole changeover portion of negative pole linkage segment one end, the negative pole linkage segment with the negative pole overlap joint portion just sets up at the interval and with the negative pole connecting portion is connected, the negative pole changeover portion is followed the direction of height of stack body extends to surpass the stack body, the negative pole changeover portion is used for linking to each other with outside electric connection structure.

4. The electrical core of claim 3, wherein the positive connection segment is welded to the positive connection portion and the negative connection segment is welded to the negative connection portion.

5. The battery cell of claim 2, wherein in the height direction of the laminate, the turning direction of the positive electrode blank space is the same as the turning direction of the negative electrode blank space, and the direction of the end of the positive electrode connecting portion is the same as the direction of the end of the negative electrode connecting portion.

6. The battery cell of claim 2, wherein in the height direction of the laminate, the turning direction of the positive electrode blank region is opposite to the turning direction of the negative electrode blank region, and the end of the positive electrode connecting portion faces opposite to the end of the negative electrode connecting portion.

7. The battery cell of any one of claims 1 to 6, wherein the insulating gasket is any one of a tape sheet, a rubber sheet, a fiber sheet, and a glass sheet.

8. A lithium ion battery is characterized by comprising a shell and the battery cell of any one of claims 1 to 7, wherein a containing cavity is formed in the shell in a hollow mode, and the shell is provided with a first opening and a second opening for extending the positive bus bar piece and the negative bus bar piece.

9. The lithium ion battery of claim 8, wherein the first opening and the second opening are located on a same side of the housing, or wherein the first opening and the second opening are located on different sides of the housing.

Images