Laminated cell and laminated battery
By designing and bonding a "Z"-shaped folded diaphragm in the Z-shaped laminated cell, the problem of black leakage caused by diaphragm folding was solved, achieving cell sealing and cost-effectiveness.
Patent Information
- Application Number
- CN202423054455.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-10
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2034-12-10
AI Technical Summary
In Z-shaped laminates, the diaphragm material is relatively soft, and the diaphragm at the end corner of the laminate is prone to folding, resulting in exposed electrodes and blackening.
Design a stacked battery cell where the separator is folded in a "Z" shape along its length to form an insertion space, and the electrodes are inserted into different spaces. The free section of the separator covers the open end, and the edge of the separator is fixed by an adhesive. The ratio of the size of the free section to the stacked battery cell is controlled to be 2:10 to 5:10 to avoid the separator from folding.
It effectively prevents the diaphragm from folding over, avoids exposure of the electrode ends, ensures cell sealing, saves on diaphragm usage, and reduces costs.
Smart Images
Figure CN223680162U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of energy storage, in particular to a laminated cell and a laminated battery. BACKGROUND
[0002] The laminated body is one of the main assembly forms of lithium ion cells, and is widely used in soft package and square shell cells. Due to the limitation of the aluminum plastic film pit depth, the thickness of the cell cannot be thickened, so the single laminated body design is mostly used. The size and style of the square shell cell are more flexible, and the thickness range of the cell can be designed to be larger, so that multiple laminated bodies can be accommodated inside.
[0003] For the Z-shaped laminated body, the separator at the end angle position of the laminated body is easy to fold over, so that the pole piece is exposed, resulting in a black leakage. CONTENT OF THE UTILITY MODEL
[0004] Therefore, the purpose of the present application is to provide a laminated cell and a laminated battery to solve or partially solve the problems in the background art.
[0005] To achieve the above purpose, the first aspect of the present application provides a laminated cell, comprising:
[0006] A plurality of first pole pieces and a plurality of second pole pieces, the first pole pieces and the second pole pieces are alternately stacked in sequence along a first direction, and the first pole piece and the last pole piece are both the first pole piece in the first direction;
[0007] A separator is folded in a "Z" shape along the length direction to form a plurality of insertion spaces, the plurality of insertion spaces include first spaces and second spaces alternately arranged along the first direction, the opening ends of the first spaces and the opening ends of the second spaces are arranged opposite to each other in the cross section along the first direction, the first pole pieces are inserted into the first spaces, the second pole pieces are inserted into the second spaces, the separator includes two free sections, at least one of the free sections is bent along the first direction and covers the opening end of the first space, and the ratio of the size of the free section to the size of the laminated cell in the first direction is 2:10-5:10.
[0008] Optionally, in the first direction, the first layer and the last layer of the separator both have a first surface away from the surface of the first space, and the laminated cell further comprises two first adhesive members spaced apart along a second direction, the first adhesive members are connected to one of the first surfaces and extend to the other first surface, and the second direction is the width direction of the separator.
[0009] Optionally, in the second direction, the ratio of the distance between the edge of the first adhesive and the edge of the first surface to the length of the first surface is 1:10-3:10. 。
[0010] Optionally, in the second direction, the distance between the edge of the first adhesive and the edge of the first surface is 10-14 mm.
[0011] Optionally, the first surface completely covers the first pole piece in the orthographic projection of the first surface on the plane of the first pole piece, in the second direction, the distance between the edge of the first surface and the edge of the first pole piece is a first distance, in a third direction, the distance between the edge of the first surface and the edge of the first pole piece is a second distance, the ratio of the first distance to the second distance is 1.1:1-2:1, and the third direction is perpendicular to both the second direction and the first direction.
[0012] Optionally, the first distance is 2-4 mm, and / or the second distance is 0.5-3.5 mm.
[0013] Optionally, in the first direction, the size of the free section is greater than or equal to 3 mm and less than 5 mm.
[0014] Optionally, the laminated battery cell further comprises at least one second adhesive, the at least one second adhesive is located between two first adhesives, and the second adhesive is connected to one of the first surfaces and extends to the other first surface.
[0015] The second aspect of the present application provides a laminated battery cell comprising the laminated battery cell of any one of the first aspect.
[0016] Optionally, the laminated battery cell further comprises a top cover, both of the free sections of the laminated battery cell are bent along the first direction and cover the open end of the first space, and both of the free sections are arranged away from the top cover.
[0017] It can be seen from the above that the laminated cell and the laminated battery provided by the application, the laminated cell comprises a plurality of first pole pieces and a plurality of second pole pieces, the first pole pieces and the second pole pieces are sequentially and alternately arranged along a first direction, and the first pole piece and the last pole piece are both the first pole piece in the first direction; the diaphragm is folded in a "Z" shape along the length direction to form a plurality of insertion spaces, the plurality of insertion spaces comprise first spaces and second spaces which are alternately arranged along the first direction, the opening end of the first space and the opening end of the second space are oppositely arranged in the cross section along the first direction, the first pole piece is inserted into the first space, and the second pole piece is inserted into the second space, at least one free section of the diaphragm is bent along the first direction and covers the opening end of the first space, so that the diaphragm covers the opening end of the first space and covers the end of the first pole piece in the first space, so as to ensure that the end of the first pole piece is not exposed due to the folding of the free section of the diaphragm. At the same time, in the first direction, the ratio of the size of the free section to the size of the laminated cell is 2:10-5:10, so that the size of the free section is moderate, which can ensure that the free section can completely cover the opening end of the first space to cover the end of the first pole piece in the first space, ensure that there is no black leakage, avoid the length of the diaphragm being too long to cause interference between the two free sections, and save the amount of diaphragm and reduce the cost. BRIEF DESCRIPTION OF DRAWINGS
[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.
[0019] Figure 1 The structure schematic diagram of the laminated cell of the embodiment of the present application is shown;
[0020] Figure 2 The first cross-sectional schematic diagram of the laminated cell of the embodiment of the present application is shown;
[0021] Figure 3 The second cross-sectional schematic diagram of the laminated cell of the embodiment of the present application is shown;
[0022] Figure 4 The third cross-sectional schematic diagram of the laminated cell of the embodiment of the present application is shown;
[0023] Figure 5 The schematic diagram of the laminated battery of the embodiment of the present application is shown.
[0024] In the figure: 1, the laminated cell; 11, the first pole piece; 12, the second pole piece; 13, the diaphragm; 131, the free section; 132, the first surface; 14, the insertion space; 141, the first space; 142, the second space; 15, the first adhesive; 151, the first adhesive part; 152, the second adhesive part; 16, the second adhesive; 17, the tab; 2, the top cover; 3, the shell. DETAILED DESCRIPTION
[0025] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below with specific examples and with reference to the accompanying drawings.
[0026] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be understood as the usual meaning understood by those skilled in the art to which the present application belongs. The terms "first", "second" and similar terms used in the present application do not represent any order, quantity or importance, but are only used to distinguish different components. The terms "include" or "contain" and similar terms mean that the elements or objects before the terms cover the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right" and the like are only used to represent relative positional relationships, and when the absolute positions of the described objects change, the relative positional relationships may also change accordingly.
[0027] The laminated body is one of the main forms of pole piece assembly of lithium ion cells, and is widely used in soft package and square shell cells. Due to the limitation of the aluminum plastic film pit depth, the thickness of the soft package cell cannot be thickened, so it is usually designed as a single laminated body. The size and style of the square shell cell are more flexible, and the thickness range of the cell can be designed to be larger, so that multiple laminated bodies can be accommodated inside.
[0028] The laminated body can be divided into laminated laminated body and Z-shaped laminated body due to different stacking methods. In the laminated laminated body, the positive pole piece, the diaphragm and the negative pole piece are all cut into specific sizes, and then stacked in sequence to form the laminated laminated body. In the Z-shaped laminated body, the positive pole piece and the negative pole piece are cut into specific sizes, and the diaphragm is a long strip structure. The diaphragm is folded in a Z shape, and the positive pole piece and the negative pole piece are alternately inserted into the space formed by the Z-shaped folded diaphragm.
[0029] For the Z-shaped laminated body, the diaphragm at the end angle position of the laminated body is easy to fold over, so that the pole piece is exposed, resulting in a black leakage.
[0030] Therefore, how to prevent the diaphragm at the end angle position from being folded to avoid the occurrence of the laminated core body is an urgent problem to be solved.
[0031] Based on this, the application provides a laminated core, which can effectively solve the problem of diaphragm folding.
[0032] Figure 1 The structural schematic diagram of the laminated core of the embodiment of the application is shown, Figure 2 The first cross-sectional schematic diagram of the laminated core of the embodiment of the application is shown, Figure 3 The second cross-sectional schematic diagram of the laminated core of the embodiment of the application is shown.
[0033] Referring to Figure 1 , Figure 2 and Figure 3 , the laminated core 1 comprises a plurality of first pole pieces 11 and a plurality of second pole pieces 12, the first pole pieces 11 and the second pole pieces 12 are sequentially and alternately arranged along a first direction, and the first pole piece and the last pole piece in the first direction are both the first pole pieces 11; the diaphragm 13 is folded in a "Z" shape along the length direction to form a plurality of insertion spaces, the plurality of insertion spaces comprise first spaces 141 and second spaces 142 which are alternately arranged along the first direction, the opening end of the first space 141 and the opening end of the second space 142 are oppositely arranged on the cross section in the first direction, the first pole pieces 11 are inserted into the first spaces 141, the second pole pieces 12 are inserted into the second spaces 142, the diaphragm 13 comprises two free sections 131, at least one free section 131 is bent along the first direction and covers the opening end of the first space 141, and the ratio of the size of the free section 131 to the size of the laminated core 1 in the first direction is 2:10-5:10.
[0034] Specifically, the first direction is the direction shown by T in Figure 2 .
[0035] The first pole pieces 11 and the second pole pieces 12 are sequentially and alternately arranged along the first direction, and the first pole piece and the last pole piece in the first direction are both the first pole pieces 11. The polarities of the first pole pieces 11 and the second pole pieces 12 are different. In the embodiment, the first pole pieces 11 are negative pole pieces, and the second pole pieces 12 are positive pole pieces. That is, the negative pole pieces are located at the first layer and the last layer of the stack to ensure that the negative pole pieces can cover the positive pole pieces completely.
[0036] The diaphragm 13 is folded in a "Z" shape along the length direction to form a plurality of insertion spaces, the plurality of insertion spaces include first spaces 141 and second spaces 142 arranged alternately along a first direction, in a cross section along the first direction, the open end of the first space 141 and the open end of the second space 142 are arranged oppositely, the first pole piece 11 is inserted into the first space 141 from the open end of the first space 141, and the second pole piece 12 is inserted into the second space 142 from the open end of the second space 142, so that the first pole piece 11 and the second pole piece 12 are both completely covered by the diaphragm 13 at one end and located in the open end of the first space 141 or the second space 142 at the other end.
[0037] For the first pole piece and the last pole piece in the first direction, if the end of the open end of the first space 141 is not wrapped by the diaphragm 13 but only covered on the surface, due to the softness of the diaphragm 13, the diaphragm 13 above the open end of the first space 141 is prone to be folded, if the diaphragm 13 is folded, the diaphragm 13 cannot cover the end of the first pole piece 11 in the first space 141, and the end of the first pole piece 11 is exposed, resulting in blackening leakage.
[0038] In the present application, in order to avoid such blackening leakage, at least one free section 131 of the diaphragm 13 is bent along the first direction and covers the open end of the first space 141 in the first direction, so that the diaphragm 13 covers the open end of the first space 141 in the first direction, which can wrap the end of the first pole piece 11 in the first space 141, and ensure that the end of the first pole piece 11 is not exposed due to the folding of the free section 131 of the diaphragm 13.
[0039] Further, in the first direction, the ratio of the size of the free section 131 (i.e. Figure 3 Q in the figure) to the size of the laminated battery cell 1 (i.e. Figure 3 B in the figure) is 2:10-5:10, so that the size of the free section 131 is moderate, which can ensure that the free section 131 can completely cover the open end of the first space 141 to cover the end of the first pole piece 11 in the first space 141, and ensure that blackening leakage does not occur, and can also avoid that the length of the diaphragm 13 is too long to cause interference between the two free sections 131, and can also save the amount of diaphragm 13 and reduce the cost.
[0040] If the ratio of the size of the free section 131 to the size of the laminated battery cell 1 is less than 2:10, at this time the size of the free section 131 is too small to cover the open end of the first space 141 close to the free section 131, and thus cannot cover the end of the first pole piece 11 inserted into the first space 141, resulting in the possibility of blackening leakage.
[0041] If the ratio of the size of the free section 131 to the size of the jelly-roll 1 is greater than 5:10, the size of the free section 131 is too large, and when the two free sections 131 are bent, the two free sections 131 interfere with each other, and the amount of the separator 13 is increased, and the manufacturing cost is increased.
[0042] Exemplarily, in the first direction, the ratio of the size of the free section 131 to the size of the jelly-roll 1 can be 2:10, 3:10, 4:10, or 5:10.
[0043] Further, in the first direction, the sizes of the two free sections 131 can be the same or different. In the embodiment, the size of the free section 131 is greater than or equal to 3 mm and less than 5 mm. Exemplarily, the size of the free section 131 can be 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, or the like.
[0044] Figure 4 A third cross-sectional view of the jelly-roll 1 of the embodiment is shown.
[0045] In some embodiments, continuing to refer to Figure 1 and Figure 4 shown, in the first direction, the surface of the first layer and the last layer of the separator 13 away from the first space 141 is the first surface 132, and the jelly-roll 1 further includes two first adhesive members 15 spaced apart along a second direction, the first adhesive member 15 is connected with one of the first surfaces 132 and extends to the other first surface 132, and the second direction is the width direction of the separator 13 (i.e., the direction shown in N of Figure 1 ).
[0046] Specifically, each first surface 132 is connected with a free section 131. The area of the first surface 132 close to the free section 131 is an edge area. The first adhesive member 15 is connected with the edge area of one of the first surfaces 132 and extends to the edge area of the other first surface 132, so that the first adhesive member 15 can bond the edge areas of the two first surfaces 132 to fix the edge areas of the two first surfaces 132, and ensure that the edge areas of the two first surfaces 132 do not fold, thereby further avoiding the occurrence of black leakage due to the folding of the separator 13.
[0047] In addition, the first adhesive member 15 and the second adhesive member 16 are bonded with the first surface 132 of the separator 13, but not directly bonded with the first tab 11, so that the active material on the first tab 11 can be prevented from falling off, and the first tab 11 can be protected.
[0048] The first adhesive 15 is connected to one of the first surfaces 132 and extends to the other first surface 132, i.e. the first adhesive 15 can extend from any direction as long as the first adhesive 15 can simultaneously adhere and fix the two first surfaces 132.
[0049] For example, as shown in Figure 4 , the first adhesive 15 is connected to one of the first surfaces 132 and extends to the other first surface 132 along the first direction, so that the first adhesive 15 not only can simultaneously adhere and fix the two first surfaces 132, but also can cover part of the two free sections 131 to limit the free sections 131, preventing the free sections 131 from being folded and deviated.
[0050] In some embodiments, continuing to refer to Figure 1 , in the second direction (i.e. the direction indicated by N in Figure 1 , the ratio of the distance between the edge of the first adhesive 15 and the edge of the first surface 132 to the length of the first surface 132 is 1:10-3:10.
[0051] Specifically, when the ratio of the distance between the edge of the first adhesive 15 and the edge of the first surface 132 (i.e. the distance indicated by A in Figure 1 ) to the length of the first surface 132 (i.e. the distance indicated by H in Figure 1 ) is 1:10-3:10, the adhesive position of the first adhesive 15 is appropriate, which ensures that the first adhesive 15 can adhere and fix the edge area of the first surface 132, preventing the edge area of the first surface 132 from being folded.
[0052] When the ratio of the distance between the edge of the first adhesive 15 and the edge of the first surface 132 to the length of the first surface 132 is less than 1:10, the adhesive position of the first adhesive 15 is too close to the edge of the first surface 132, which requires very fine adhesive process of the first adhesive 15, which is not conducive to the actual manufacturing process.
[0053] When the ratio of the distance between the edge of the first adhesive 15 and the edge of the first surface 132 to the length of the first surface 132 is greater than 3:10, the adhesive position of the first adhesive 15 is too far away from the edge of the first surface 132, so that the first adhesive 15 cannot effectively adhere and fix the edge area of the first surface 132, so that the edge area of the first surface 132 can still be folded, which can cause the phenomenon of black leakage.
[0054] For example, in the second direction, the ratio of the distance between the edge of the first adhesive 15 and the edge of the first surface 132 to the length of the first surface 132 can be 1:10, 1.5:10, 2:10, 2.5:10, 3:10, etc.
[0055] Further, the distance between the edge of the first adhesive 15 and the edge of the first surface 132 can be the same or different.
[0056] In the second direction, the distance between the edge of the first adhesive 15 and the edge of the first surface 132 is 10-14 mm. For example, the distance between the edge of the first adhesive 15 and the edge of the first surface 132 can be 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, etc.
[0057] In some embodiments, continuing to refer to Figure 1 As shown in FIG. 1, the first surface 132 has a projection on the plane where the first tab 11 is located, which completely covers the first tab 11. In the second direction (i.e., the direction shown by N in FIG. 1), the distance between the edge of the first surface 132 and the edge of the first tab 11 is a first distance (i.e., the distance shown by L in FIG. 1), and in the third direction (i.e., the direction shown by M in FIG. 1), the distance between the edge of the first surface 132 and the edge of the first tab 11 is a second distance (i.e., the distance shown by W in FIG. 1). The ratio of the first distance to the second distance is 1.1:1-2:1, and the third direction is perpendicular to the second direction and the first direction. Figure 1 Figure 1 Figure 1 Figure 1
[0058] Specifically, as shown in FIG. 1, the second direction is also the extension direction of the first tab 11 and the direction in which the tab 17 of the first tab 11 extends. Figure 1
[0059] The first surface 132 has a projection on the plane where the first tab 11 is located, which completely covers the first tab 11, i.e., the first surface 132 exceeds the first tab 11 in the second direction and the third direction, ensuring that the first surface 132 of the diaphragm 13 can completely cover the first tab 11, avoiding exposure of the first tab 11 due to the edge or four corners of the diaphragm 13 being folded.
[0060] Further, since in the third direction, the edge of the first surface 132 is connected to the free section 131, the probability of the edge of the first surface 132 being folded is relatively small, so the distance between the edge of the first surface 132 and the edge of the first tab 11, i.e., the second distance, does not need to be too large, and it is sufficient to ensure that the edge of the first surface 132 covers the edge of the first tab 11 in the third direction.
[0061] However, in the second direction, since the edge of the first surface 132 is the edge of the diaphragm 13, the edge of the first surface 132 is more likely to be folded, and thus the distance between the edge of the first surface 132 and the edge of the first pole piece 11, i.e., the first distance, needs to be slightly larger in the second direction to ensure that no black leakage occurs in the second direction.
[0062] Therefore, in the present application, the ratio of the first distance to the second distance is 1.1:1-2:1. In this way, on the one hand, the first distance is larger than the second distance, ensuring that no folding occurs at the edges of the first surface 132, thereby ensuring that no black leakage occurs. On the other hand, the sizes of the first distance and the second distance are moderate, which, under the premise of ensuring that no black leakage occurs, reduces the size of the first surface 132 as much as possible to facilitate the subsequent assembly of the battery cell and the shell.
[0063] When the ratio of the first distance to the second distance is less than 1.1:1, the size of the first distance is too small, i.e., in the second direction, the size of the outward extension of the edge of the first surface 132 is too short. Once the edge of the first surface 132 is folded, the end of the first pole piece 11 is exposed, resulting in black leakage.
[0064] When the ratio of the first distance to the second distance is greater than 2:1, the size of the first distance is too large, which, although can avoid black leakage, excessively increases the size of the first surface 132, thereby being not conducive to the subsequent assembly of the battery cell and the shell.
[0065] Exemplarily, the ratio of the first distance to the second distance can be 1.1:1, 1.2:1, 1.3:1, 1.4:1, 1.5:1, 1.6:1, 1.7:1, 1.8:1, 1.9:1, 2:1, etc.
[0066] In the present embodiment, the first distance is 2-4 mm, and / or the second distance is 0.5-3.5 mm. In this way, the sizes of the first distance and the second distance are moderate, ensuring that no black leakage occurs and that the size of the first surface 132 is not excessively large.
[0067] Exemplarily, the first distance can be 2 mm, 3 mm, 4 mm, etc. The second distance can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, etc.
[0068] In some embodiments, continuing to refer to Figure 5 As shown, the laminated battery cell 1 further includes at least one second adhesive 16 located between the two first adhesives 15, the second adhesive 16 being connected to one of the first surfaces 132 and extending to the other first surface 132.
[0069] Specifically, the second bonding member 16 is connected with both of the two first surfaces 132 to fix the non-edge areas of the two first surfaces 132, and can also bundle and fix the plurality of first pole pieces 11, the second pole pieces 12 and the plurality of layers of diaphragms 13 between the two first surfaces 132, so as to avoid the positions of the first pole pieces 11 and the second pole pieces 12 from moving.
[0070] The application also provides a laminated battery, Figure 5 A schematic diagram of a laminated battery according to an embodiment of the application is shown.
[0071] Referring to As shown, the laminated battery includes the laminated battery cell 1 of any of the above embodiments, the top cover 2 and the shell, and the laminated battery cell 1 is located in the accommodating space formed by the top cover 2 and the shell. Both of the two free sections 131 of the laminated battery cell 1 are bent along the first direction and cover the open end of the first space 141, and both of the two free sections 131 are arranged away from the top cover 2.
[0072] Specifically, the laminated battery can include one laminated battery cell 1 described above, or can include a plurality of laminated battery cells 1 arranged in a stack.
[0073] Both of the two free sections 131 are arranged away from the top cover 2, so that the free sections 131 will not be inserted into the connection position of the top cover 2 and the shell, avoiding affecting the installation of the top cover 2 and the shell by the free sections 131.
[0074] At the same time, both of the two free sections 131 are arranged away from the top cover 2, that is, the open end of the first space 141 covered by the two free sections 131 is also arranged away from the top cover 2, so that when liquid is injected into the shell from the liquid injection hole on the top cover 2, the injected liquid will not directly impact the open end of the first space 141, and will not directly impact the first pole pieces 11 located in the first space 141, so that the active material on the first pole pieces 11 can be prevented from falling off, and the first pole pieces 11 can be protected.
[0075] Since the negative pole piece is more likely to cause the active material to fall off than the positive pole piece, in the present application, the first pole pieces 11 are negative pole pieces, and the second pole pieces 12 are positive pole pieces, so that the open end of the first space 141 arranged away from the top cover 2 can protect the negative pole pieces located in the first space 141 from falling off under the impact of the liquid injection liquid.
[0076] The laminated battery also has the technical effects of any of the above embodiments, which will not be repeated here.
[0077] Those skilled in the art will understand that the above discussion of any of the embodiments is merely exemplary in nature and is not intended to imply that the scope of the application, including the claims, is limited to these examples; the above embodiments or technical features among different embodiments can also be combined, steps can be implemented in any order, and there are many other changes to the different aspects of the application as described above, which are not provided in detail in order to be brief. The embodiments of the present application are intended to cover all such alternatives, modifications, and variations as fall within the broad scope of the appended claims. Accordingly, any omission, modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
[0078] The embodiments of the present application are intended to cover all such alternatives, modifications, and variations as fall within the broad scope of the appended claims. Accordingly, any omission, modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims
1. A jelly-roll cell, characterized by, The application relates to a laminated battery cell, comprising: a plurality of first and second pole pieces, which are alternately stacked in sequence along a first direction, and the first and last pole pieces are both the first pole pieces in the first direction; a diaphragm, which is folded in a "Z" shape along a length direction to form a plurality of insertion spaces, the plurality of insertion spaces comprise first and second spaces alternately arranged along the first direction, the opening ends of the first and second spaces are oppositely arranged in a cross section along the first direction, the first pole pieces are inserted into the first spaces, the second pole pieces are inserted into the second spaces, the diaphragm comprises two free sections, at least one of the free sections is bent along the first direction and covers the opening end of the first space, and the ratio of the size of the free section to the size of the laminated battery cell is 2:10-5:10 in the first direction.
2. The jellyroll of claim 1, wherein In the first direction, the first and last layers of the diaphragm are both first surfaces away from the surfaces of the first spaces, and the laminated battery cell further comprises two first adhesive members spaced apart along a second direction, the first adhesive members are connected to one of the first surfaces and extend to the other first surface, and the second direction is the width direction of the diaphragm.
3. The jellyroll of claim 2, wherein, In the second direction, the ratio of the distance between the edge of the first adhesive and the edge of the first surface to the length of the first surface is 1:10 to 3:10 。 4. The jellyroll of claim 3, wherein, In the second direction, the distance between the edge of the first adhesive member and the edge of the first surface is 10-14 mm.
5. The jellyroll of claim 2, wherein, The orthographic projection of the first surface on the plane of the first pole piece completely covers the first pole piece, in the second direction, the distance between the edge of the first surface and the edge of the first pole piece is a first distance, in a third direction, the distance between the edge of the first surface and the edge of the first pole piece is a second distance, and the ratio of the first distance to the second distance is 1.1:1-2:1, and the third direction is perpendicular to the second and first directions.
6. The jellyroll of claim 5, wherein, The first distance is 2-4 mm, and / or the second distance is 0.5-3.5 mm.
7. The jellyroll of claim 1, wherein, In the first direction, the size of the free section is greater than or equal to 3 mm and less than 5 mm.
8. The jellyroll of claim 2, wherein, The laminated battery cell further comprises at least one second adhesive member, and the at least one second adhesive member is located between the two first adhesive members, and the second adhesive member is connected to one of the first surfaces and extends to the other first surface.
9. A stacked battery, characterized by The laminated battery cell comprises the laminated battery cell according to any one of claims 1-8.
10. The stacked battery of claim 9, wherein, The laminated battery cell further comprises a top cover, and the two free sections of the laminated battery cell are both bent along the first direction and cover the opening ends of the first spaces, and the two free sections are both arranged away from the top cover.