Battery cell structure and battery

Abstract

The utility model provides a battery cell structure and a battery, and belongs to the technical field of batteries, the battery cell structure comprises a battery cell body, a tab and a first support adhesive tape, the battery cell body is provided with a first surface and a second surface which are arranged back to back along the thickness direction of the battery cell body, and the battery cell body is provided with a third surface and a fourth surface which are arranged back to back along the height direction of the battery cell body; the tab extends outwards from the third surface, the tab is provided with a tab root part and a tab front part, the tab front part is bent after being connected with the adapter plate, and a gap is defined by the tab front part, the tab root part and the third surface; the first supporting adhesive tape comprises a first acting section, a second acting section and a third acting section which are connected in sequence, the first acting section is adhered to the front part of the tab, the second acting section is adhered to the root part of the tab, and the third acting section is adhered to the third surface. And in the core combining process, the first supporting adhesive tape plays a role in supporting and protecting, so that the safety risks such as sinking of the tabs are avoided, and the performance and the stability of the battery are further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly relates to a cell structure and a battery. Background Art

[0002] Secondary batteries, that is, rechargeable batteries, have the advantages of light weight, high specific energy, long cycle life, etc., and are widely used in power batteries.

[0003] At present, in the production and manufacturing process of secondary batteries, after the cells are made, ultrasonic welding between the tabs and the adapter plates, laser welding and cell assembly between the adapter plates and the top covers are carried out in sequence. During the cell assembly process, if the state of the tabs is uncontrollable, safety risks such as tab sinking will occur. Summary of the Utility Model

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the defect that in the prior art, in the process of cell assembly of lithium-ion batteries, if the state of the tabs is uncontrollable, safety risks such as tab sinking will occur, so as to provide a cell structure and a battery.

[0005] To solve the above technical problem, the utility model provides a cell structure, including:

[0006] A cell body, the cell body has a first surface and a second surface arranged opposite to each other along its thickness direction, and the cell body has a third surface and a fourth surface arranged opposite to each other along its height direction;

[0007] Tabs extend outwards from the third surface, the tabs have tab roots and tab fronts, the tab fronts are bent after being connected to the adapter plates, and a gap is formed by enclosing the tab fronts, the tab roots and the third surface;

[0008] A first support tape is arranged in the gap, the first support tape includes a first action section, a second action section and a third action section connected in sequence, the first action section is adhered to the tab front, the second action section is adhered to the tab root, and the third action section is adhered to the third surface.

[0009] Optionally, the length of the second action section is L1, the height of the gap is H, the thickness of the cell body is T, and H < L1 < T.

[0010] Optionally, the length of the third action section is L2, the thickness of the cell body is T, and L2 = T / 2.

[0011] Optionally, the first support tape further includes a fourth action section, the fourth action section is connected to the third action section, and the fourth action section is adhered to the first surface.

[0012] Optionally, it further includes: a second support tape, disposed on a side of the tab opposite to the gap, the second support tape including a fifth acting section and a sixth acting section, the fifth acting section being adhered to the second surface, and the sixth acting section being adhered to the adapter piece.

[0013] Optionally, the adapter piece includes a tab connection portion and a terminal connection portion, the tab connection portion being used for welding with the tab, and the terminal connection portion being used for welding with the top cover;

[0014] The length of the sixth acting section is L3, the width of the welding mark on the adapter piece is B, and L3 > B; the sixth acting section at least entirely covers the welding mark formed by welding the adapter piece and the tab, and the sixth acting section does not cover the terminal connection portion of the adapter piece.

[0015] Optionally, the length of the fifth acting section acting on the second surface is L4, and L4 is greater than 5 mm; the length of the fourth acting section acting on the first surface is L5, and L5 is greater than 5 mm.

[0016] Optionally, crease lines are provided between adjacent acting sections of the first support tape and between adjacent acting sections of the second support tape.

[0017] Optionally, the thickness of the first support tape at the crease line is less than the thickness of any one of the acting sections of the first support tape; the thickness of the second support tape at the crease line is less than the thickness of any one of the acting sections of the second support tape;

[0018] Or, in the first support tape, a plurality of through holes are spaced apart at the crease line to form the crease line of the first support tape; in the second support tape, a plurality of through holes are spaced apart at the crease line to form the crease line of the second support tape.

[0019] The present utility model further provides a battery, including the cell structure according to any one of the above.

[0020] The technical solution of the present utility model has the following advantages:

[0021] The cell structure provided by the present utility model includes a cell body, a tab, and a first support tape. The cell body has a first surface and a second surface arranged opposite to each other along its thickness direction, and a third surface and a fourth surface arranged opposite to each other along its height direction; the tab extends outward from the third surface, the tab has a tab root and a tab front portion, the tab front portion is bent after being connected to a transfer piece, and a gap is formed by enclosing the tab front portion, the tab root, and the third surface; the first support tape is arranged in the gap, and the first support tape includes a first acting section, a second acting section, and a third acting section connected in sequence, which are adhesively bonded to the tab front portion, the tab root, and the third surface respectively;

[0022] Through the arrangement of the first support tape, the tab and the cell body are relatively fixed to each other, having a good supporting effect. During the process of cell assembly, the state of the tab is controllable. As the cell assembly is completed, the first support tape reaches a set shape, that is, the tab reaches a set state. The first support tape plays a role in support and protection, avoiding safety risks such as tab sinking, and further improving the performance and stability of the battery. Description of the Drawings

[0023] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required to be used in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a schematic structural diagram of an embodiment of the cell structure provided in Embodiment 1 of the present utility model;

[0025] Figure 2 is Figure 1 a partial enlarged schematic diagram in;

[0026] Figure 3 is Figure 1 a schematic structural diagram of the first support tape in;

[0027] Figure 4 is Figure 1 a schematic structural diagram of the second support tape in;

[0028] Figure 5 is Figure 1 a schematic structural diagram of the first support tape and the second support tape before bonding in;

[0029] Description of the Reference Numerals:

[0030] 1. Battery cell body; 2. First surface; 3. Second surface; 4. Third surface; 5. Tab; 6. Tab root; 7. Front part of tab; 8. Adapter piece; 9. Gap; 10. First support tape; 11. First acting section; 12. Second acting section; 13. Third acting section; 14. Fourth acting section; 15. Second support tape; 16. Fifth acting section; 17. Sixth acting section; 18. Crease line; 19. Terminal connection part. Detailed implementation manner

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0032] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0033] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0034] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0035] Embodiment 1

[0036] The battery cell structure provided in this embodiment has high safety during the manufacturing process.

[0037] Such as Figures 1 to 4As shown in the figure, a specific implementation of the battery cell structure provided by this embodiment includes a battery cell body 1, a tab 5, and a first support tape 10. The battery cell body 1 has a first surface 2 and a second surface 3 arranged opposite to each other in its thickness direction, and the battery cell body 1 has a third surface 4 and a fourth surface arranged opposite to each other in its height direction. The tab 5 extends outward from the third surface 4. The tab 5 has a tab root 6 and a tab front 7. After the tab front 7 is connected to the adapter plate 8, it is bent. The tab front 7, the tab root 6, and the third surface 4 enclose a gap 9. The first support tape 10 is arranged in the gap 9. The first support tape 10 includes a first action section 11, a second action section 12, and a third action section 13 connected in sequence. The first action section 11 is adhered to the tab front 7, the second action section 12 is adhered to the tab root 6, and the third action section 13 is adhered to the third surface 4.

[0038] Through the arrangement of the first support tape 10, the tab 5 and the battery cell body 1 are relatively fixed to each other, and have a good supporting effect. During the process of assembling the battery cells, the state of the tab 5 is controllable. As the assembly of the battery cells is completed, the first support tape 10 reaches a set shape, that is, the tab 5 reaches a set state. The first support tape 10 plays a role in supporting and protecting, avoiding safety risks such as tab sinking, and further improving the performance and stability of the battery.

[0039] Among them, the setting of the gap 9 not only facilitates the subsequent laser welding of the adapter plate 8 and the top cover, but also is beneficial to the electrolyte to quickly infiltrate the electrode sheets in the battery cell body 1.

[0040] There are two battery cell bodies 1 in this embodiment, which is a dual-battery-cell structure. The two battery cell bodies 1 are arranged opposite to each other. Each battery cell body 1 has two tabs 5, one of which is a positive tab and the other is a negative tab. There are two adapter plates 8, one of which is a positive adapter plate and the other is a negative adapter plate. The positive adapter plate is simultaneously connected to the two positive tabs on the two battery cell bodies 1, and the negative adapter plate is simultaneously connected to the two negative tabs on the two battery cell bodies.

[0041] In other embodiments, there is one battery cell body 1, which has a positive tab and a negative tab. The positive tab is connected to the positive adapter plate, and the negative tab is connected to the negative adapter plate.

[0042] Specifically, the thickness of the first support tape 10 and the second support tape 15 mentioned later is 0.5 - 2 mm, preferably 1 - 1.5 mm. The first support tape 10 with this thickness has a good supporting effect.

[0043] Such as Figure 2As shown, for the cell structure provided in this embodiment, the length of the second acting section 12 is L1, the height of the gap 9 is H, and the thickness of the cell body 1 is T, where H < L1 < T.

[0044] The setting of the second acting section 12 plays an important role in the final form of the tab 5. If its length is too short, it will cause the tab 5 to pile up, posing a risk. If its length is too long, it will affect the bending of the front part 7 of the tab.

[0045] Specifically, the second acting section 12 is inclined to adapt to the state of the tab 5 after core combination. The optimal inclination angle of the second acting section 12 is 45 degrees.

[0046] As Figure 2 shown, for the cell structure provided in this embodiment, the length of the third acting section 13 is L2, and the thickness of the cell body 1 is T, where L2 = T / 2. The limitation of the L2 dimension further ensures the stability of the tab 5 after core combination.

[0047] In other embodiments, the length of L2 is set to other values, and corresponding settings can be made according to the bending condition of the tab 5.

[0048] As Figure 2 and Figure 3 shown, for the cell structure provided in this embodiment, the first support tape 10 further includes a fourth acting section 14. The fourth acting section 14 is connected to the third acting section 13, and the fourth acting section 14 is adhered to the first surface 2.

[0049] The fourth acting section 14 acts on the cell body 1 and combines with the third acting section 13 to further ensure the overall stability of the first support tape 10.

[0050] As Figure 1 and Figure 4 shown, for the cell structure provided in this embodiment, it further includes: a second support tape 15, which is arranged on the side of the tab 5 opposite to the gap 9. The second support tape 15 includes a fifth acting section 16 and a sixth acting section 17. The fifth acting section 16 is adhered to the second surface 3, and the sixth acting section 17 is adhered to the adapter piece 8.

[0051] The second support tape 15 cooperates with the first support tape 10 to fix both the inner and outer sides of the tab 5, ensuring the stability of the tab 5 in all directions.

[0052] As Figure 2 shown, for the cell structure provided in this embodiment, the length of the sixth acting section 17 is L3, and the width of the weld mark formed by welding the adapter piece 8 and the tab 5 is B, where L3 > B.

[0053] Specifically, the adapter piece 8 includes an ear connection part and a terminal connection part 19. The ear connection part is used for welding with the ear 5, and the terminal connection part 19 is used for welding with the top cover. The sixth acting section 17 at least entirely covers the weld mark formed by welding the adapter piece 8 and the ear 5, and the sixth acting section 17 does not cover the terminal connection part 19 of the adapter piece 8.

[0054] The length of L3 is greater than the weld mark width B, and the sixth acting section 17 at least entirely covers the weld mark formed by welding the adapter piece 8 and the ear 5. Thus, the sixth acting section 17 can protect the weld mark formed by welding the adapter piece 8 and the ear 5, and the sixth acting section 17 avoids contacting the terminal connection part 19 where the adapter piece 8 is welded to the top cover, so as not to affect the welding of the adapter piece 8 and the top cover.

[0055] As Figure 2 shown, in the cell structure provided in this embodiment, the length of the fifth acting section 16 acting on the second surface 3 is L4, and L4 is greater than 5 mm; the length of the fourth acting section 14 acting on the first surface 2 is L5, and L5 is greater than 5 mm.

[0056] The area within 5 mm from the edge of the cell body 1 is the OVERHANG area, which generally refers to the part of the negative electrode tab that extends beyond the positive and negative electrode tabs in the length and width directions. If the lengths acting on the second surface 4 and the first surface 2 are too short, it will result in unstable adhesion. Other dimensions greater than 5 mm are not limited.

[0057] As Figure 5 shown, in the cell structure provided in this embodiment, crease lines 18 are provided between adjacent acting sections of the first support tape 10 and between adjacent acting sections of the second support tape 15. The provision of the crease lines 18 facilitates the bending of the support tapes.

[0058] In a specific implementation manner of the crease line 18, the thickness of the first support tape 10 at the crease line 18 is less than the thickness of any acting section of the first support tape 10; the thickness of the second support tape 15 at the crease line 18 is less than the thickness of any acting section of the second support tape 15.

[0059] In another specific implementation manner of the crease line 18, in the first support tape 10, a plurality of through holes are spaced apart at the crease line 18 to form the crease line 18 of the first support tape 10; in the second support tape 15, a plurality of through holes are spaced apart at the crease line 18 to form the crease line 18 of the second support tape 15.

[0060] The setting of the crease line plays a role in facilitating bending during the process of core assembly after the first support tape 10 is applied, and also enables the tab 5 to be bent in a preset direction, thereby ensuring the bending state of the tab 5 and improving the stability after bending. Moreover, due to the setting of the crease line 18, the supporting effect of the first support tape 10 on the tab 5 is enhanced.

[0061] For the cell structure provided in this embodiment, the materials of the first support tape 10 and the second support tape 15 are electrolyte-resistant materials. Specifically, it can be pet material, pp material or pi material.

[0062] Embodiment 2

[0063] The battery provided in this embodiment includes the cell structure described in any one of Embodiment 1, and the number of cell structures is not limited, and can be a single cell, a dual cell, a four-cell, etc.

[0064] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A battery cell structure, characterized in that: include: A battery cell body (1), wherein the battery cell body (1) has a first surface (2) and a second surface (3) disposed opposite to each other along its thickness direction, and the battery cell body (1) has a third surface (4) and a fourth surface disposed opposite to each other along its height direction; The pole lug (5) extends outward from the third surface (4), the pole lug (5) comprises a pole lug root portion (6) and a pole lug front portion (7), the pole lug front portion (7) is connected to the adapter sheet (8) and then bent, and the pole lug front portion (7), the pole lug root portion (6) and the third surface (4) are surrounded to form a gap (9); A first supporting tape (10) is arranged in the gap (9), wherein the first supporting tape (10) comprises a first action section (11), a second action section (12) and a third action section (13) which are connected in sequence, wherein the first action section (11) is bonded to the front portion of the pole lug (7), the second action section (12) is bonded to the root portion of the pole lug (6), and the third action section (13) is bonded to the third surface (4).

2. The battery cell structure according to claim 1, characterized in that: The length of the second action section (12) is L1, the height of the gap (9) is H, the thickness of the battery cell body (1) is T, and H<L1<T.

3. The battery cell structure according to claim 1, characterized in that: The length of the third action section (13) is L2, the thickness of the battery cell body (1) is T, and L2=T / 2.

4. The battery cell structure according to claim 1, characterized in that: The first supporting adhesive tape (10) further comprises a fourth action section (14), wherein the fourth action section (14) is connected to the third action section (13), and the fourth action section (14) is bonded to the first surface (2).

5. The battery cell structure according to claim 4, characterized in that: Also includes: The second supporting tape (15) is arranged on the side of the pole ear (5) opposite to the gap (9), and the second supporting tape (15) includes a fifth action section (16) and a sixth action section (17), the fifth action section (16) is bonded to the second surface (3), and the sixth action section (17) is bonded to the adapter sheet (8).

6. The battery cell structure according to claim 5, characterized in that: The adapter plate (8) comprises a pole lug connection portion and a pole column connection portion (19), wherein the pole lug connection portion is used for welding with the pole lug (5), and the pole column connection portion (19) is used for welding with the top cover; The length of the sixth action section (17) is L3, the width of the weld mark on the adapter plate (8) is B, and L3>B; the sixth action section (17) at least completely covers the weld mark formed by welding the adapter plate (8) and the pole lug (5), and the sixth action section (17) does not cover the pole connecting portion (19) of the adapter plate (8).

7. The battery cell structure according to claim 5, characterized in that: The length of the fifth action section (16) acting on the second surface (3) is L4, and L4 is greater than 5 mm; the length of the fourth action section (14) acting on the first surface (2) is L5, and L5 is greater than 5 mm.

8. The battery cell structure according to claim 5, characterized in that: A crease line (18) is provided between two adjacent action sections of the first supporting tape (10) and between two adjacent action sections of the second supporting tape (15).

9. The battery cell structure according to claim 8, characterized in that: The thickness of the first supporting tape (10) at the crease line (18) is smaller than the thickness of any active section of the first supporting tape (10); the thickness of the second supporting tape (15) at the crease line (18) is smaller than the thickness of any active section of the second supporting tape (15); Alternatively, in the first supporting tape (10), a plurality of through holes are arranged at intervals at the crease line (18), thereby forming the crease line (18) of the first supporting tape (10); and in the second supporting tape (15), a plurality of through holes are arranged at intervals at the crease line (18), thereby forming the crease line (18) of the second supporting tape (15).

10. A battery, characterized in that: The invention comprises the battery core structure as described in any one of claims 1 to 9.

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