Battery monomer, battery monomer assembling method and battery

Abstract

The invention provides a battery monomer, a battery monomer assembling method and a battery. The battery monomer comprises a cover plate assembly, a switching piece, a laminated core and an insulating protection piece, the switching piece is flat and straight and is attached to the back surface of the cover plate assembly, the switching piece is electrically connected with a pole of the cover plate assembly, and a plurality of welding areas arranged in the first direction are arranged on the switching piece; a plurality of laminated cores are arranged in the first direction, and the tabs of all the laminated cores are respectively and sequentially welded into all the welding areas; the insulation protection sheet is connected to the edge of the cover plate assembly and wraps the side surface of the laminated core. Therefore, the plurality of laminated cores are respectively and independently welded on the adapter sheets, and the adapter sheets do not need to be bent, so that the capacitance can be increased by increasing the number of the laminated cores, and the original thickness of a single laminated core can still be kept, so that the lugs do not need to be heightened and adjusted, the high-capacity requirement is met, the product yield and the safety performance are also ensured, and the production cost is reduced. The problem of how to provide a battery monomer structure meeting the high-capacity requirement in the prior art is solved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery cell assembly method and a battery. Background Art

[0002] At present, with the development of lithium battery technology, lithium batteries are widely used in the fields of power batteries and energy storage batteries. Whether it is a power battery or an energy storage battery, improving the battery volume energy density and mass energy density and accommodating more electricity in a limited space is an important research direction in the industry and has obvious economic value.

[0003] In the prior art, as the requirements for large capacity of battery cells in power batteries and energy storage batteries are gradually increasing, conventional battery cell structures can no longer meet the requirements for large current flow capacity. Therefore, it is particularly important to provide a battery cell structure that meets the large capacity requirements. Summary of the invention

[0004] In view of this, the present application provides a battery cell, a battery cell assembly method and a battery to solve the problem in the prior art of how to provide a battery cell structure that meets large capacity requirements.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] A battery cell, comprising:

[0007] Cover plate assembly;

[0008] An adapter sheet, which is straight and attached to the back of the cover assembly, the adapter sheet is electrically connected to the pole of the cover assembly, and the adapter sheet is provided with a plurality of welding areas arranged along a first direction;

[0009] A plurality of stacked cores are provided and arranged along the first direction, and the tabs of each stacked core are welded to each welding area in sequence;

[0010] An insulating protective sheet is connected to the edge of the cover plate assembly and covers the side surface of the stacked core.

[0011] Optionally, the adapter sheet includes:

[0012] A main body sheet, comprising a first main sheet surface and a second main sheet surface distributed on the front and back sides, wherein the first main sheet surface is provided with a plurality of the welding areas;

[0013] The pole connecting piece is connected to the second main piece surface, and the pole connecting piece is provided with a protrusion, and the protrusion is in contact with and electrically connected to the pole surface.

[0014] Optionally, a surface of the pole connecting sheet opposite to the second main sheet surface is divided into a contact area and a clearance area;

[0015] The pole connecting piece is attached to the main body piece in the contact area;

[0016] The pole connecting piece is spaced apart from the main body piece in the clearance area, and the protrusion is formed in the clearance area by stamping.

[0017] Optionally, the insulating protective sheet includes:

[0018] A first insulating section is opposite to the adapter sheet of the first polarity, and the first insulating section and the adapter sheet of the first polarity have the same width;

[0019] The second insulating portion is opposite to the adapter plate of the second polarity, and the second insulating portion and the adapter plate of the second polarity have the same width.

[0020] Optionally, the insulating protection sheet is provided on one side, and the bending direction of the pole ear points to a side away from the insulating protection sheet.

[0021] Optionally, the insulating protection sheet is bonded to the lower plastic of the cover assembly; or, the insulating protection sheet is integrally connected to the lower plastic of the cover assembly by injection molding.

[0022] Optionally, there are four to ten stacked cores, and the thickness of each stacked core is less than or equal to mm.

[0023] A battery cell assembly method, applicable to any of the battery cells in the above, the method comprising:

[0024] The adapter plate is welded to the pole of the cover plate assembly so that the adapter plate and the cover plate assembly form a whole, and the insulating protection sheet is laid flat along the plane direction of the adapter plate;

[0025] Place the first stacked core flat on the adapter, and weld the straight tabs to the corresponding welding areas on the adapter. Then flip the stacked core so that the stacked core is perpendicular to the cover plate assembly and the tabs are bent accordingly, and so on, until all the stacked cores are stacked.

[0026] Fold the insulating protection sheet to cover the side surface of the stacked core;

[0027] All the stacked cores are wrapped and installed in the shell, and the cover plate assembly is welded to the shell.

[0028] Optionally, the tab is welded to the adapter by single-mode laser welding.

[0029] A battery comprises a plurality of battery cells as described above.

[0030] The battery cell provided in the present application includes a cover plate assembly, a adapter plate, a stacked core and an insulating protective sheet; the adapter plate is flat and is attached to the back side of the cover plate assembly, the adapter plate is electrically connected to the pole of the cover plate assembly, and a plurality of welding areas arranged along a first direction are provided on the adapter plate; a plurality of stacked cores are provided and arranged along the first direction, and the pole ears of each stacked core are welded to each welding area in turn; the insulating protective sheet is connected to the edge of the cover plate assembly and covers the side surface of the stacked core. With such an arrangement, multiple stacked cores are individually welded to the adapter plate in the same manner, and are electrically connected to the adapter plate with the pole ears in a bent state. Since the design of the battery cell in the present application ensures that the adapter plate does not need to be bent, the capacity can be increased by increasing the number of stacked cores, and a single stacked core can still retain its original thickness. In this way, there is no need to increase the height of the pole ears, and only the size of the adapter plate and the cover plate assembly needs to be adaptively adjusted. The battery cell provided in the present application meets the large-capacity requirements while ensuring the product yield and safety performance, solving the problem of how to provide a battery cell structure that meets the large-capacity requirements in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0032] Figure 1 A schematic diagram of the back side of the cover plate assembly and the adapter sheet provided in the embodiment of the present application;

[0033] Figure 2 A front view schematic diagram of a cover plate assembly and an adapter sheet provided in an embodiment of the present application;

[0034] Figure 3 A schematic diagram of the disassembled structure of the adapter provided in an embodiment of the present application;

[0035] Figure 4 A partial cross-sectional view of the cover plate assembly and the adapter plate provided in an embodiment of the present application;

[0036] Figure 5 The battery cell assembly method provided in the embodiment of the present application Figure 1 ;

[0037] Figure 6 The battery cell assembly method provided in the embodiment of the present application Figure 2 ;

[0038] Figure 7 The battery cell assembly method provided in the embodiment of the present application Figure 3 ;

[0039] Figure 8 The battery cell assembly method provided in the embodiment of the present application Figure 4 ;

[0040] Fig. 9 The battery cell assembly method provided in the embodiment of the present application Figure 5 ;

[0041] Fig.10 The battery cell assembly method provided in the embodiment of the present application Figure 6 .

[0042] exist Figure 1-Figure 10 middle:

[0043] 1. Cover plate assembly; 2. Adapter plate; 3. Stacked core; 4. Insulation protection sheet;

[0044] 11. Pole; 12. Upper plastic; 13. Lower plastic; 14. Cover plate;

[0045] 21. main body piece; 22. pole connecting piece; 221. protruding part; 222. contact area; 223. air avoidance area;

[0046] 31. Extreme ears;

[0047] 41. First insulating section; 42. Second insulating section. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0049] In the related art, 280-314AH battery cells usually adopt the four-layer core 3-secondary core technology. Such a battery cell structure design requires the adapter 2 to be bent, and the bending of the adapter 2 is relatively difficult. Especially for large-capacity battery cells above 500AH, the thickness of the adapter 2 reaches more than 1.0mm. If the four-layer core 3-secondary core method is continued, the adapter 2 will be difficult to bend into an ideal state.

[0050] If a large-capacity battery cell of more than 500AH adopts the conventional two-layer core 3 solution, the thickness of the layered core 3 needs to be more than 32mm, and the height of the tab 31 will reach more than 40mm, which will cause the tab 31 to be easily folded, especially in the laser die-cutting process. As long as the line speed exceeds 30m / min, the folding problem of the tab 31 cannot be avoided, making the product production capacity and yield both bottlenecks, and the feasibility is not high.

[0051] like Figure 1-Figure 10 As shown, the embodiment of the present application provides a battery cell, including a shell, a cover plate assembly 1, an adapter plate 2, a stacked core 3 and an insulating protective sheet 4; the adapter plate 2 is straight and attached to the back of the cover plate assembly 1, the adapter plate 2 is electrically connected to the pole 11 of the cover plate assembly 1, and a plurality of welding areas arranged along a first direction are provided on the adapter plate 2; the stacked core 3 is provided with a plurality of and arranged along the first direction, and the pole ears 31 of each stacked core 3 are welded to each welding area in sequence; the insulating protective sheet 4 is connected to the edge of the cover plate assembly 1 and covers the side surface of the stacked core 3; all the stacked cores 3 are installed in the shell, and the cover plate assembly 1 is sealed and connected to the shell. Among them, the first direction is the thickness direction of the stacked core 3. In the thickness direction of the stacked core 3, the size of the adapter plate 2 corresponds to the total thickness of all the stacked cores 3.

[0052] With such arrangement, multiple stacked cores 3 are individually welded to the adapter plate 2 in the same manner, and are electrically connected to the adapter plate 2 in a bent state of the pole ear 31. Since the design of the battery cell in the present application does not require the adapter plate 2 to be bent, the capacitance can be increased by increasing the number of stacked cores 3, and a single stacked core 3 can still retain its original thickness. In this way, there is no need to increase the height of the pole ear 31, and only the size of the adapter plate 2 and the cover plate assembly 1 needs to be adaptively adjusted. The battery cell provided in the present application meets the large capacity requirements while ensuring the product yield and safety performance, and solves the problem of how to provide a battery cell structure that meets the large capacity requirements in the prior art. In addition, the insulating protective sheet 4 protects the pole ear 31 and the shell opening, and prevents the risk of edge short circuit in the cover plate assembly 1.

[0053] As is known, the pole 11 is divided into a positive pole and a negative pole, and the adapter 2 is correspondingly divided into a positive adapter 2 and a negative adapter 2 ; the stacked core 3 includes a stacked core 3 body and a pole ear 31 .

[0054] It should be noted that the outer shell can also be called a square shell, which is generally an aluminum shell.

[0055] For ease of understanding, the structure of the cover assembly 1 can be a variety of common structural designs in the prior art, including a cover 14, a positive pole, a negative pole, an upper plastic 12, a lower plastic 13, etc. The pole 11 is located in the pole 11 through hole of the upper plastic 12. For example, please refer to Figure 4 Generally speaking, the cover plate assembly 1 is also provided with an explosion-proof structure.

[0056] In some preferred embodiments, the adapter sheet 2 includes a main body sheet 21 and a pole connecting sheet 22; the main body sheet 21 is a flat sheet that is flat throughout, and the main body sheet 21 has a first main sheet surface and a second main sheet surface distributed on the front and back, and the first main sheet surface is provided with multiple welding areas; the pole connecting sheet 22 is connected to the second main sheet surface of the main body sheet 21 by welding, and the pole connecting sheet 22 is provided with a protrusion 221, which extends into the through hole of the pole 11 of the cover plate assembly 1, and the protrusion 221 is in contact with the pole 11 surface and is electrically connected.

[0057] In this arrangement, the pole connecting piece 22 mainly serves to provide the protrusion 221 and electrically connect with the pole 11, and the thickness of the pole connecting piece 22 can be made to a degree that is easy to process; while the main body piece 21 mainly serves to provide the thickness of the adapter piece 2 and is welded with the pole ear 31. Since the main body piece 21 is designed to be flat throughout, a thicker thickness can be used.

[0058] Furthermore, in some preferred embodiments, the side of the pole connecting piece 22 opposite to the second main piece surface is divided into a contact area 222 and a void area 223; the pole connecting piece 22 is in contact with the main piece 21 in the contact area 222; the pole connecting piece 22 is spaced apart from the main piece 21 in the void area 223, and the protrusion 221 is formed in the void area 223 by stamping.

[0059] With such arrangement, since the protruding portion 221 of the pole connecting piece 22 is obtained by stamping, the pole connecting piece 22 around the protruding portion 221 may be uneven. In order to prevent a possible virtual connection between this portion and the main sheet 21, in the present application, the pole connecting piece 22 has a partitioned design. The pole connecting piece 22 is used to form the portion of the protruding portion 221 and the surrounding portion, forming a non-contact air avoidance design with the main sheet 21, and the portion away from the protruding portion 221 is tightly fitted with the main sheet 21. Such a design can improve the safety performance of the battery cell.

[0060] In some other preferred embodiments, the insulating protective sheet 4 includes a first insulating section 41 and a second insulating section 42; the first insulating section 41 is opposite to the adapter sheet 2 of the first polarity, and the first insulating section 41 and the adapter sheet 2 of the first polarity are of equal width; the second insulating section 42 is opposite to the adapter sheet 2 of the second polarity, and the second insulating section 42 and the adapter sheet 2 of the second polarity are of equal width. The first polarity and the second polarity are opposite in polarity, illustratively, the first polarity refers to the positive pole, and the second polarity refers to the negative pole. It should be noted that equal width should include the basic equal width situation without considering the influence of errors.

[0061] With such a configuration, the insulating protection sheet 4 is designed to be split, and is respectively and specifically provided for protection at the positive and negative electrode positions, and is not distributed along the edge of the lower plastic 13 of the cover assembly 1 , which is beneficial to saving material costs.

[0062] In some other optional embodiments, the insulating protection sheet 4 can be arranged on one side or on both sides. In particular, it is preferred that the insulating protection sheet 4 is arranged on one side, and the bending direction of the pole ear 31 points to the side away from the insulating protection sheet 4. In this way, during the assembly of the battery cell, the insulating protection sheet 4 is arranged on one side, so its position can play a role in distinguishing the positive and negative poles, and has a certain prompting effect; moreover, the side of the pole ear 31 away from the bending direction is more likely to have a short circuit risk, so the insulating protection sheet 4 is specifically arranged on this side.

[0063] In some other optional embodiments, the insulating protective sheet 4 is bonded to the lower plastic 13 of the cover assembly 1, and insulating glue can be used for bonding; alternatively, the insulating protective sheet 4 is connected to the lower plastic 13 of the cover assembly 1 by injection molding. Since the lower plastic 13 is generally an injection-molded part, the connection with the insulating protective sheet 4 can be completed during the injection molding process of the lower plastic 13, and the insulating protective sheet 4 is formed as a whole during the injection molding.

[0064] In some specific embodiments, there are four to ten stacked cores 3, and the thickness of each stacked core 3 is less than or equal to 18 mm. Since the battery cell structure provided in this application can still use the original stacked core 3, the laser die cutting and lamination in the previous process are within the compatible range of mature equipment, and the existing equipment needs little modification. Only the ultrasonic welding process of the assembly line and the laser welding process of the adapter sheet 2 cover need to be adjusted and modified to implement the application, which has strong feasibility.

[0065] Based on the above battery cells. Please refer to Figure 5-Figure 10 The present application also provides a battery cell assembly method, which is applicable to the above-mentioned battery cell. The method includes:

[0066] The adapter plate 2 is welded to the pole 11 of the cover plate assembly 1, so that the adapter plate 2 and the cover plate assembly 1 form a whole, and the insulating protection sheet 4 is laid flat along the plane direction of the adapter plate 2;

[0067] Place the first stacked core 3 flat on the adapter plate 2, and weld the straight tabs 31 to the corresponding welding areas on the adapter plate 2, then flip the stacked core 3 so that the stacked core 3 is perpendicular to the cover plate assembly 1 and the tabs 31 are bent accordingly, and so on, until all the stacked cores 3 are stacked;

[0068] Fold the insulating protection sheet 4 to cover the side surface of the stacked core 3;

[0069] All the stacked cores 3 are wrapped and placed in a housing, and the cover plate assembly 1 is welded to the housing.

[0070] With such an arrangement, multiple stacked cores 3 are individually welded to the adapter plate 2 in the same manner, and the electrical connection is completed with the adapter plate 2 in a bent state of the pole ear 31. The adapter plate 2 does not need to be bent, so the capacitance can be increased by increasing the number of stacked cores 3. The original thickness of a single stacked core 3 can still be retained, so there is no need to increase the height of the pole ear 31. The existing welding process of the pole ear 31 and the adapter plate 2 can still be used. Only the size of the adapter plate 2 and the cover plate assembly 1 needs to be adaptively adjusted. The battery cell provided in the present application meets the large capacity requirements while also ensuring the product yield and safety performance, solving the problem of how to provide a battery cell structure that meets the large capacity requirements in the prior art.

[0071] In some preferred embodiments, the tab 31 is welded to the adapter 2 by single-mode laser welding.

[0072] Based on the above battery cells, the present application also provides a battery, which includes a plurality of the above battery cells. Since the battery has the above battery cells, the beneficial effects of the battery brought by the battery cells can be found in the above content, which will not be repeated here.

[0073] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0074] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0075] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0076] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0077] It should be understood that the qualifiers "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present application are only used to more clearly explain the technical solutions and cannot be used to limit the scope of protection of the present application.

[0078] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A battery cell, characterized in that: include: Cover plate assembly (1); The adapter plate (2) is straight and attached to the back of the cover plate assembly (1), the adapter plate (2) is electrically connected to the pole (11) of the cover plate assembly (1), and the adapter plate (2) is provided with a plurality of welding areas arranged along a first direction; A plurality of stacked cores (3) are provided and arranged along the first direction, and the tabs (31) of each stacked core (3) are welded to each welding area in sequence; An insulating protective sheet (4) is connected to the edge of the cover plate assembly (1) and covers the side surface of the stacked core (3).

2. The battery cell according to claim 1, characterized in that: The adapter sheet (2) comprises: A main body sheet (21) having a first main sheet surface and a second main sheet surface distributed on the front and back sides, wherein the first main sheet surface is provided with a plurality of the welding areas; A pole connecting piece (22) is connected to the second main piece surface, and the pole connecting piece (22) is provided with a protruding portion (221), and the protruding portion (221) is in surface contact with and electrically connected to the pole (11).

3. The battery cell according to claim 2, characterized in that: A surface of the pole connecting sheet (22) opposite to the second main sheet surface is divided into a contact area (222) and a clearance area (223); The pole connecting piece (22) is in contact with the main body piece (21) in the contact area (222); The pole connecting piece (22) is spaced apart from the main body piece (21) in the clearance area (223), and the protruding portion (221) is formed in the clearance area (223) by stamping.

4. The battery cell according to claim 1, characterized in that: The insulating protective sheet (4) comprises: A first insulating portion (41) is located opposite to the adapter plate (2) of the first polarity, and the first insulating portion (41) and the adapter plate (2) of the first polarity have the same width; The second insulating portion (42) is located opposite to the adapter plate (2) of the second polarity, and the second insulating portion (42) and the adapter plate (2) of the second polarity have the same width.

5. The battery cell according to claim 1, characterized in that: The insulating protection sheet (4) is arranged on one side, and the bending direction of the pole ear (31) points to the side away from the insulating protection sheet (4).

6. The battery cell according to claim 1, characterized in that: The insulating protection sheet (4) is bonded to the lower plastic (13) of the cover assembly (1); or the insulating protection sheet (4) is integrally connected to the lower plastic (13) of the cover assembly (1) by injection molding.

7. The battery cell according to claim 1, characterized in that: There are four to ten stacked cores (3), and the thickness of each stacked core (3) is less than or equal to 18 mm.

8. A battery cell assembly method, characterized in that: Applicable to the battery cell according to any one of claims 1 to 7, the method comprising: The adapter plate (2) is welded to the pole (11) of the cover plate assembly (1) so that the adapter plate (2) and the cover plate assembly (1) form a whole, and the insulating protection sheet (4) is laid flat along the plane direction of the adapter plate (2); The first stacked core (3) is placed flat on the adapter plate (2), and the straight tabs (31) are welded to the corresponding welding areas on the adapter plate (2), and then the stacked core (3) is turned over so that the stacked core (3) is perpendicular to the cover plate assembly (1) and the tabs (31) are bent accordingly, and so on, until all the stacked cores (3) are stacked and arranged; Folding the insulating protection sheet (4) to cover the side surface of the stacked core (3); All the stacked cores (3) are wrapped and placed in a shell, and the cover plate assembly (1) is welded to the shell.

9. The battery cell assembly method according to claim 8, characterized in that: The pole tab (31) is welded to the adapter plate (2) by single-mode laser welding.

10. A battery, characterized in that: The invention comprises a plurality of battery cells according to any one of claims 1 to 7.

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