Single cell and battery pack

Abstract

The utility model relates to the technical field of batteries, and provides a single battery cell and a battery pack. Each single battery cell is provided with a positive electrode end and a negative electrode end; the positive terminal and / or the negative terminal have / has a non-welding region and a welding region configured to connect an electrical connection tab. Wherein the positive electrode end and / or the negative electrode end are / is provided with an anti-corrosion layer. And the anti-corrosion layer is connected with the non-welding area. The anti-corrosion layer is provided with an avoiding hole corresponding to the welding area. Therefore, the corrosion resistance of the single battery cell can be improved, and the service life of the single battery cell in a high-temperature and high-humidity environment can be prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to single battery and battery package. BACKGROUND

[0002] In the related art, the positive terminal and the negative terminal of the single battery are only protected from corrosion by the plating layer of the metal part. However, the stamping notch of part of the metal part of the positive terminal and the negative terminal does not have a plating layer. In a high temperature and high humidity environment, the metal part is prone to corrosion and perforation, which causes the single battery to have a risk of failure. SUMMARY

[0003] Embodiments of the utility model provide a single battery and a battery package, which can improve the corrosion resistance of the single battery.

[0004] In a first aspect, embodiments of the utility model provide a single battery, which has a positive terminal and a negative terminal, and the positive terminal and / or the negative terminal each has a non-welding area and a welding area configured to connect an electrical connecting sheet, wherein the positive terminal and / or the negative terminal is provided with a corrosion-resistant layer, the corrosion-resistant layer is connected with the non-welding area, and the corrosion-resistant layer has a relief hole corresponding to the welding area.

[0005] In some embodiments, the corrosion-resistant layer covers the non-welding area.

[0006] In an embodiment, the single battery is provided in a cylindrical shape, the diameter of the single battery is D1, the corrosion-resistant layer is provided in a circular ring shape, the inner diameter of the corrosion-resistant layer is D2, the outer diameter is D3, the welding area is provided in a circular shape, the diameter of the welding area is D4, and the following conditions are met: D4≤D2<D3≤D1.

[0007] In an embodiment, a sleeve is sleeved on the circumferential side of the single battery, the sleeve has a first extension part extending to the positive terminal and a second extension part extending to the negative terminal, the corrosion-resistant layer is connected with the side of the first extension part or the second extension part away from the single battery, wherein the first extension part and the second extension part are each in a circular ring shape, the outer diameter of the first extension part and the second extension part is the same as the outer diameter of the single battery, the inner diameter of the first extension part is D5, the inner diameter of the second extension part is D8, and the following conditions are met: D4≤D2<D5<D3≤D1, D4≤D2<D8<D3≤D1.

[0008] In an embodiment, the difference between the outer diameter D3 of the corrosion-resistant layer and the inner diameter D5 of the first extension part or the second extension part is δ, and the following condition is met: δ≥0.5 millimeters.

[0009] In an embodiment, a ratio of an inner diameter D2 of the anticorrosion layer to a diameter D1 of the single battery cell is alpha, and satisfies: 15%≤alpha≤90%.

[0010] In an embodiment, a ratio of an outer diameter D3 of the anticorrosion layer to the diameter D1 of the single battery cell is beta, and satisfies: 70%≤beta≤100%.

[0011] In an embodiment, a side of the anticorrosion layer facing the non-welding area is provided with a glue layer, and the glue layer is bonded to the non-welding area.

[0012] In an embodiment, a thickness of the anticorrosion layer is D6, and satisfies: 0.02mm≤D6≤0.2mm.

[0013] In an embodiment, a thickness of the glue layer is D7, and satisfies: 0.01mm≤D7≤0.13mm.

[0014] In an embodiment, the anticorrosion layer comprises at least one of a PET layer, a PVC layer and a TPU layer.

[0015] In an embodiment, the positive electrode end and / or the negative electrode end is provided with a top cover, the top cover comprises a main body part and a bent part, the main body part is arranged to be spaced apart from an electrode assembly of the single battery cell, one end of the bent part is connected to the main body part, and the other end extends towards the electrode assembly and is electrically connected to the electrode assembly, wherein, on a side away from the electrode assembly, at least part of an area of the main body part forms the welding area, and the remaining area of the main body part and the bent part form the non-welding area.

[0016] In an embodiment, the anticorrosion layer is attached to the bent part.

[0017] In an embodiment, the anticorrosion layer is arranged to be spaced apart from the bent part.

[0018] In a second aspect, an embodiment of the utility model provides a battery pack, comprising the single battery cell as described above.

[0019] The embodiment of the utility model has the advantages of:

[0020] In the embodiment of the utility model, the anticorrosion layer is connected to the non-welding area of the positive electrode end and the non-welding area of the negative electrode end, so that the anticorrosion layer plays a corrosion protection effect on the positive electrode end and the negative electrode end of the single battery cell. Therefore, the corrosion resistance of the single battery cell can be improved, and the service life of the single battery cell in a high-temperature and high-humidity environment can be prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0022] Figure 1 is a perspective view of the battery cell provided by the embodiment of the present application;

[0023] Figure 2 is Figure 1 is an exploded view of the battery cell provided by the embodiment of the present application;

[0024] Figure 3 is a sectional view of the anti-corrosion layer provided by the embodiment of the present application;

[0025] Figure 4 is a top view of the single battery cell provided by the embodiment of the present application;

[0026] Figure 5 is a top view of the anti-corrosion layer provided by the embodiment of the present application;

[0027] Figure 6 is a perspective view of the anti-corrosion layer provided by the embodiment of the present application;

[0028] Figure 7 is a perspective view of the anti-corrosion layer provided by the embodiment of the present application;

[0029] Figure 8 is a voltage-time contrast curve diagram of the single battery cell with the anti-corrosion adhesive paper and the single battery cell without the anti-corrosion layer in a high-temperature and high-humidity environment.

[0030] Reference signs:

[0031] 10-single battery cell, 110-positive electrode end, 120-negative electrode end, 130-non-welding area, 140-welding area, 20-electrically connecting sheet, 30-anti-corrosion layer, 310-avoidance hole, 330-adhesive layer, 40-sleeve, 410-first extension part, 420-second extension part, 50-top cover, 510-main body part, 520-bending part, 530-connecting part, 60-electrode assembly. DETAILED DESCRIPTION

[0032] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application. In addition, it should be understood that the specific implementation described herein is only used to illustrate and explain the present application, and is not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower of the device in the actual use or working state, and specifically refer to the direction of the drawing in the drawings. And "inner" and "outer" refer to the outline of the device.

[0033] Please refer to Figures 1 to 8 The present application provides a single battery cell 10. The single battery cell 10 has a positive electrode end 110 and a negative electrode end 120. The positive electrode end 110 and / or the negative electrode end 120 each has a non-welding area 130 and a welding area 140 configured to connect the electric connecting sheet 20. Wherein, the positive electrode end 110 and / or the negative electrode end 120 is provided with an anti-corrosion layer 30. The anti-corrosion layer 30 is connected with the non-welding area 130. And the anti-corrosion layer 30 has a avoiding hole 310 corresponding to the welding area 140.

[0034] In some embodiments, the non-welding area 130 of the positive electrode end 110 and the non-welding area 130 of the negative electrode end 120 are connected by the anti-corrosion layer 30, so as to utilize the anti-corrosion layer 30 to play a corrosion protection effect on the positive electrode end 110 and the negative electrode end 120 of the single battery cell 10. Thus, the corrosion resistance of the single battery cell 10 can be improved, and the service life of the single battery cell 10 in a high temperature and high humidity environment can be prolonged.

[0035] It can be understood that the avoiding hole 310 of the anti-corrosion layer 30 can avoid the welding area 140 of the positive electrode end 110 or the negative electrode end 120, so that the positive electrode end 110 and the negative electrode end 120 have an area for welding with the electric connecting sheet 20. Generally, the welding area 140 is circular in shape and located at the center position of the positive electrode end 110 or the negative electrode end 120. When the single battery cell 10 is a cylindrical battery cell, the non-welding area 130 is a circular ring.

[0036] For the welding area 140, the welding area 140 is the area where the positive terminal 110 or the negative terminal 120 is welded with the electric connecting sheet 20. For the non-welding area 130, when the sleeve 40 on the circumference of the single battery cell 10 does not extend to the positive terminal 110 and the negative terminal 120, the non-welding area 130 of the positive terminal 110 and the negative terminal 120 is all the area on the end face except the welding area 140. When the sleeve 40 on the circumference of the single battery cell 10 extends to the positive terminal 110 and the negative terminal 120, the non-welding area 130 of the positive terminal 110 and the negative terminal 120 is the area on the end face between the welding area 140 and the area covered by the sleeve 40.

[0037] As shown in FIGS. 1 and 2, in some embodiments, the anticorrosion layer 30 covers the non-welding area 130. In this way, the positive terminal 110 and the negative terminal 120 of the single battery cell 10 can be sealed by the anticorrosion layer 30, so that the positive terminal 110 and the negative terminal 120 of the single battery cell 10 are isolated from external water vapor, and the metal parts of the positive terminal 110 and the negative terminal 120 are prevented from being corroded. Figure 1 Figure 2 As shown in FIGS. 1 and 2, in some embodiments, the anticorrosion layer 30 covers the non-welding area 130. In this way, the positive terminal 110 and the negative terminal 120 of the single battery cell 10 can be sealed by the anticorrosion layer 30, so that the positive terminal 110 and the negative terminal 120 of the single battery cell 10 are isolated from external water vapor, and the metal parts of the positive terminal 110 and the negative terminal 120 are prevented from being corroded.

[0038] In some embodiments, the anticorrosion layer 30 can not completely cover the non-welding area 130. In this case, the non-welding area 130 adhered by the anticorrosion layer 30 can effectively form a corrosion protection, and the corrosion resistance of the single battery cell 10 can also be improved.

[0039] The electric connecting sheet 20 can electrically connect the positive terminal 110 of one single battery cell 10 with the positive terminal 110 of another single battery cell 10. Alternatively, the electric connecting sheet 20 can electrically connect the positive terminal 110 of one single battery cell 10 with the negative terminal 120 of another single battery cell 10. Alternatively, the electric connecting sheet 20 can electrically connect the negative terminal 120 of one single battery cell 10 with the negative terminal 120 of another single battery cell 10.

[0040] In some embodiments, the anticorrosion layer 30 is only pasted on the positive terminal 110 of the single battery cell 10. Alternatively, the anticorrosion layer 30 is only pasted on the negative terminal 120 of the single battery cell 10. Alternatively, the anticorrosion layer 30 is pasted on both the positive terminal 110 and the negative terminal 120 of the single battery cell 10.

[0041] As shown in FIGS. 1 and 2, in some embodiments, the single battery cell 10 is in a cylindrical shape, and the diameter of the single battery cell 10 is D1. The anticorrosion layer 30 is in a circular ring shape, and the inner diameter of the anticorrosion layer 30 is D2, and the outer diameter of the anticorrosion layer 30 is D3. The welding area 140 is in a circular shape, and the diameter of the welding area 140 is D4. It is satisfied that D4≤D2<D3≤D1. Figure 4 Figure 5 As shown in FIGS. 1 and 2, in some embodiments, the single battery cell 10 is in a cylindrical shape, and the diameter of the single battery cell 10 is D1. The anticorrosion layer 30 is in a circular ring shape, and the inner diameter of the anticorrosion layer 30 is D2, and the outer diameter of the anticorrosion layer 30 is D3. The welding area 140 is in a circular shape, and the diameter of the welding area 140 is D4. It is satisfied that D4≤D2<D3≤D1.

[0042] ​​It is understandable that making the outer diameter D3 of the anti-corrosion layer 30 less than or equal to the diameter D1 of the individual battery cell 10 ensures that the anti-corrosion layer 30 does not extend to the positive terminal 110 and the negative terminal 120. Specifically, when the individual battery cell 10 is not connected to the sleeve 40, the outer diameter D3 of the anti-corrosion layer 30 is equal to the diameter D1 of the individual battery cell 10.

[0043] The inner diameter D2 of the anti-corrosion layer 30 is made greater than or equal to the diameter D4 of the welding area 140 to prevent the anti-corrosion layer 30 from obstructing the welding area 140 and affecting the welding effect between the individual battery cell 10 and the electrical connector 20. In this embodiment, the inner diameter D2 of the anti-corrosion layer 30 is preferably equal to the diameter D4 of the welding area 140. This ensures that the anti-corrosion layer 30 covers the non-welding area 130.

[0044] The bonding effect of the anti-corrosion layer 30 is positively correlated with its bonding area. Therefore, to ensure better bonding, the outer diameter D3 of the anti-corrosion layer 30 needs to be as large as possible, and the inner diameter D2 of the anti-corrosion layer 30 needs to be as small as possible. The bonding reliability of the anti-corrosion layer 30 is optimal when the outer diameter D3 of the anti-corrosion layer 30 is equal to the diameter D1 of the single cell 10, and the inner diameter D2 of the anti-corrosion layer 30 is equal to the diameter D4 of the welding area 140.

[0045] like Figure 4 and Figure 5 As shown, in some embodiments, a sleeve 40 is fitted around the periphery of the individual battery cell 10. The sleeve 40 has a first extension 410 extending to the positive terminal 110 and a second extension 420 extending to the negative terminal 120. An anti-corrosion layer 30 is connected to the side of the first extension 410 or the second extension 420 away from the individual battery cell 10. Both the first extension 410 and the second extension 420 are annular. The outer diameters of both the first extension 410 and the second extension 420 are the same as the outer diameter of the individual battery cell 10. The inner diameter of the first extension 410 is D5, and the inner diameter of the second extension 420 is D8, satisfying: D4≤D2<D5<D3≤D1, D4≤D2<D8<D3≤D1.

[0046] Understandably, on the one hand, the sleeve 40 provides protection, preventing the casing of the individual battery cell 10 from colliding with the external structure and causing damage. On the other hand, the sleeve 40 provides insulation and corrosion protection to the periphery of the individual battery cell 10.

[0047] The sleeve 40 can be a heat-shrinkable sleeve, which is completely attached to the surface of the shell of the single battery cell 10 after heat-shrinking deformation. Meanwhile, the first extension 410 can also be completely attached to the positive electrode terminal 110, and the second extension 420 can also be completely attached to the negative electrode terminal 120. Based on the fact that the first extension 410 and the second extension 420 extend from the circumferential side of the single battery cell 10 to the center thereof, the outer diameter of the first extension 410 and the outer diameter of the second extension 420 are the same as the outer diameter of the single battery cell 10.

[0048] In which, based on the fact that the first extension 410 and the second extension 420 of the sleeve 40 can also play the effect of insulation and corrosion prevention, when the anti-corrosion layer 30 is bonded and fixed, the outer side of the anti-corrosion layer 30 can be bonded on the first extension 410 or the second extension 420. Thus, the connection gap between the first extension 410 and the positive electrode terminal 110 can be sealed, or the connection gap between the second extension 420 and the negative electrode terminal 120 can be sealed, so as to prevent water vapor from entering the single battery cell 10 from the connection gap.

[0049] The inner diameter D5 of the first extension 410 is greater than the inner diameter D2 of the anti-corrosion layer 30, and the inner diameter D5 of the first extension 410 is less than the outer diameter D3 of the anti-corrosion layer 30. Thus, it can be ensured that the anti-corrosion layer 30 can be bonded to the first extension 410. Meanwhile, based on the size design of the first extension 410, the first extension 410 can have a suitable width, so as to prevent the first extension 410 from being too wide to cause the adverse phenomenon of curling after heat-shrinking deformation, and to prevent the first extension 410 from being too wide to interfere with other components after heat-shrinking deformation.

[0050] The inner diameter D8 of the second extension 420 is greater than the inner diameter D2 of the anti-corrosion layer 30, and the inner diameter D8 of the second extension 420 is less than the outer diameter D3 of the anti-corrosion layer 30. Thus, it can be ensured that the anti-corrosion layer 30 can be bonded to the second extension 420. Meanwhile, based on the size design of the second extension 420, the second extension 420 can have a suitable width, so as to prevent the second extension 420 from being too wide to cause the adverse phenomenon of curling after heat-shrinking deformation, and to prevent the second extension 420 from being too wide to interfere with other components after heat-shrinking deformation.

[0051] In some embodiments, the inner diameter D5 of the first extension 410 is the same as the inner diameter D8 of the second extension 420. Alternatively, the inner diameter D5 of the first extension 410 is different from the inner diameter D8 of the second extension 420.

[0052] In some embodiments, a boss is configured on the electric connecting piece 20, which is used to form a weld between the electric connecting piece 20 and the welding portion. In which, the boss is also circular, and the diameter of the boss is the same as the diameter of the welding portion.

[0053] In some embodiments, the difference between the outer diameter D3 of the anticorrosion layer 30 and the inner diameter D5 of the first extension 410 is δ1, which satisfies: δ1≥0.5 millimeter; or the difference between the outer diameter D3 of the anticorrosion layer 30 and the inner diameter D5 of the second extension 420 is δ2, which satisfies: δ2≥0.5 millimeter.

[0054] It can be understood that when the anticorrosion layer 30 is bonded to the positive electrode end 110 of the single battery cell 10, the anticorrosion layer 30 will form a lap joint with the first extension 410. The lap joint area is the bonding area of the anticorrosion layer 30 and the first extension 410. The width of the lap joint area is greater than or equal to 0.5 millimeter, thereby ensuring the bonding effect of the anticorrosion layer 30 and the first extension 410, so as to ensure that the anticorrosion layer 30 can seal the connection gap between the first extension 410 and the positive electrode end 110, so as to prevent water vapor from entering the positive electrode end 110 of the single battery cell 10 from the connection gap.

[0055] For example, the difference δ1 between the outer diameter D3 of the anticorrosion layer 30 and the inner diameter D5 of the first extension 410 is set to 0.5 millimeter, 1 millimeter, 2 millimeters, 5 millimeters, etc. The value of the difference δ1 can be reasonably selected based on the size of the single battery cell 10.

[0056] It can be understood that when the anticorrosion layer 30 is bonded to the negative electrode end 120 of the single battery cell 10, the anticorrosion layer 30 will form a lap joint with the second extension 420. The lap joint area is the bonding area of the anticorrosion layer 30 and the second extension 420. The width of the lap joint area is greater than or equal to 0.5 millimeter, thereby ensuring the bonding effect of the anticorrosion layer 30 and the second extension 420, so as to ensure that the anticorrosion layer 30 can seal the connection gap between the second extension 420 and the negative electrode end 120, so as to prevent water vapor from entering the negative electrode end 120 of the single battery cell 10 from the connection gap.

[0057] For example, the difference δ2 between the outer diameter D3 of the anticorrosion layer 30 and the inner diameter D8 of the second extension 420 is set to 0.5 millimeter, 1 millimeter, 2 millimeters, 5 millimeters, etc. The value of the difference δ2 can be reasonably selected based on the size of the single battery cell 10.

[0058] In some embodiments, the ratio of the inner diameter D2 of the anticorrosion layer 30 to the diameter D1 of the single battery cell 10 is α, which satisfies: 15%≤α≤90%.

[0059] It can be understood that the smaller the ratio a of the inner diameter D2 of the anticorrosion layer 30 to the diameter D1 of the single battery cell 10, the smaller the inner diameter D2 of the anticorrosion layer 30. At this time, the inner ring of the anticorrosion layer 30 is closer to the central welding area 140. When the ratio a of the inner diameter D2 of the anticorrosion layer 30 to the diameter D1 of the single battery cell 10 is equal to 15%, the inner ring of the anticorrosion layer 30 is attached to the outer peripheral surface of the welding area 140. Thus, the welding area 140 has a large enough welding area, ensuring the reliability of the welding between the single battery cell 10 and the electrically connected sheet 20.

[0060] The larger the ratio a of the inner diameter D2 of the anticorrosion layer 30 to the diameter D1 of the single battery cell 10, the larger the inner diameter D2 of the anticorrosion layer 30. At this time, the inner ring of the anticorrosion layer 30 is farther away from the central welding area 140. When the ratio a of the inner diameter D2 of the anticorrosion layer 30 to the diameter D1 of the single battery cell 10 is equal to 90%, the inner ring of the anticorrosion layer 30 is at the maximum distance from the outer peripheral surface of the welding area 140. At this time, the anticorrosion layer 30 can also improve the corrosion resistance of the single battery cell 10.

[0061] Among them, based on limiting the ratio a of the inner diameter D2 of the anticorrosion layer 30 to the diameter D1 of the single battery cell 10, the inner diameter D2 of the anticorrosion layer 30 can be reasonably designed based on different sizes of the single battery cell 10, facilitating the rapid acquisition of the inner diameter value of the anticorrosion layer 30 of different models.

[0062] For example, the ratio a of the inner diameter D2 of the anticorrosion layer 30 to the diameter D1 of the single battery cell 10 is set to 15%. When the diameter D1 of the single battery cell 10 is set to 20 mm, the inner diameter D2 of the anticorrosion layer 30 is 3 mm.

[0063] For example, the ratio a of the inner diameter D2 of the anticorrosion layer 30 to the diameter D1 of the single battery cell 10 is set to 40%. When the diameter D1 of the single battery cell 10 is set to 10 mm, the inner diameter D2 of the anticorrosion layer 30 is 4 mm.

[0064] For example, the ratio a of the inner diameter D2 of the anticorrosion layer 30 to the diameter D1 of the single battery cell 10 can be set to 15%, 30%, 50%, 90%, or any value between any two of them.

[0065] In some embodiments, the ratio of the outer diameter D3 of the anticorrosion layer 30 to the diameter D1 of the single battery cell 10 is β. It satisfies: 70%≤β≤100%.

[0066] Understandably, the smaller the ratio β of the outer diameter D3 of the anti-corrosion layer 30 to the diameter D1 of the individual battery cell 10, the smaller the outer diameter D3 of the anti-corrosion layer 30. In this case, the outer ring of the anti-corrosion layer 30 is further away from the outer circumference of the individual battery cell 10. Since the outer diameter D3 of the anti-corrosion layer 30 is larger than the inner diameter D5 of the first extension 410 and the second extension 420, the smaller the outer diameter D3 of the anti-corrosion layer 30, the closer the first extension 410 and the second extension 420 need to be to the welding area 140, and the wider the first extension 410 and the second extension 420 need to be. Limiting the minimum value of β to 70% can prevent defects such as warping after heat shrinkage caused by excessively large widths of the first extension 410 and the second extension 420.

[0067] The larger the ratio β of the outer diameter D3 of the anti-corrosion layer 30 to the diameter D1 of the individual battery cell 10, the larger the outer diameter D3 of the anti-corrosion layer 30. In this case, the outer ring of the anti-corrosion layer 30 is closer to the outer circumferential surface of the individual battery cell 10. When the ratio β of the outer diameter D3 of the anti-corrosion layer 30 to the diameter D1 of the individual battery cell 10 is equal to 100%, the outer ring of the anti-corrosion layer 30 is flush with the outer circumferential surface of the individual battery cell 10. In this case, the width of the first extension 410 and the second extension 420 can be set to only 0.5 mm.

[0068] Among them, based on the ratio β of the outer diameter D3 of the anti-corrosion layer 30 to the diameter D1 of the single cell 10, the outer diameter D3 of the anti-corrosion layer 30 can be reasonably designed based on the single cell 10 of different sizes, which makes it easy to quickly obtain the inner diameter value of the anti-corrosion layer 30 of different models.

[0069] For example, the ratio β of the outer diameter D3 of the anti-corrosion layer 30 to the diameter D1 of the single cell 10 is set to 100%. When the diameter D1 of the single cell 10 is set to 20 mm, the outer diameter D3 of the anti-corrosion layer 30 is 20 mm.

[0070] For example, the ratio β of the outer diameter D3 of the anti-corrosion layer 30 to the diameter D1 of the single cell 10 is set to 80%. When the diameter D1 of the single cell 10 is set to 25 mm, the outer diameter D3 of the anti-corrosion layer 30 is 20 mm.

[0071] For example, the ratio β of the outer diameter D3 of the anti-corrosion layer 30 to the diameter D1 of the single cell 10 can be set to 70%, 80%, 90%, 100%, or any value between the two.

[0072] like Figure 3 As shown, in some embodiments, an adhesive layer 330 is provided on the side of the anti-corrosion layer 30 facing the non-welding area 130. The adhesive layer 330 is bonded to the non-welding area 130.

[0073] It can be understood that the adhesive layer 330 is used to realize the adhesion of the anticorrosion layer 30 and the positive electrode terminal 110 and the negative electrode terminal 120. The anticorrosion layer 30 can further have a release paper. The anticorrosion layer 30, the adhesive layer 330 and the release paper are stacked in sequence. When the anticorrosion layer 30 is adhered to the positive electrode terminal 110 or the negative electrode terminal 120, the release paper is first torn off, and then directly adhered to the positive electrode terminal 110 and the negative electrode terminal 120.

[0074] In some embodiments, the thickness of the anticorrosion layer 30 is D6. It is satisfied that 0.02 millimeters ≤ D6 ≤ 0.2 millimeters.

[0075] It can be understood that the thickness of the anticorrosion layer 30 is made thin, which can prevent the anticorrosion layer 30 from substantially increasing the height of the single battery cell 10.

[0076] For example, the thickness D6 of the anticorrosion layer 30 is set to 0.02 millimeters, 0.08 millimeters, 0.15 millimeters, 0.2 millimeters, or any value between any two of them. The specific value of the anticorrosion layer 30 is not limited in the embodiments of the present application, as long as the anticorrosion layer 30 can play an anticorrosion effect.

[0077] In some embodiments, the thickness of the adhesive layer 330 is D7. It is satisfied that 0.01 millimeters ≤ D7 ≤ 0.13 millimeters.

[0078] It can be understood that the thickness of the adhesive layer 330 is made thin, which can make the overall thickness of the anticorrosion layer 30 thinner. Thus, the anticorrosion layer 30 can be prevented from substantially increasing the height of the single battery cell 10.

[0079] For example, the thickness D7 of the adhesive layer 330 is set to 0.01 millimeters, 0.04 millimeters, 0.08 millimeters, 0.13 millimeters, or any value between any two of them. The specific value of the adhesive layer 330 is not limited in the embodiments of the present application, as long as the adhesive layer 330 has sufficient adhesion, and the adhesive layer 330 and the anticorrosion layer 30 are prevented from falling off from the single battery cell 10.

[0080] In the embodiments of the present application, the thickness D6 of the anticorrosion layer 30 is preferably set to 0.035 millimeters, and the thickness D7 of the adhesive layer 330 is preferably set to 0.13 millimeters.

[0081] In some embodiments, the anticorrosion layer 30 includes at least one of a PET layer (Polyethylene Terephthalate), a PVC layer (Polyvinyl Chloride) and a TPU layer (Thermoplastic Urethane).

[0082] Based on the choice of material for the anti-corrosion layer 30, it can have good high-temperature resistance while keeping its cost low. Therefore, the corrosion resistance of the individual battery cell 10 can be greatly improved with only a small increase in cost.

[0083] In some embodiments, the anti-corrosion layer 30 may be a PET layer. Alternatively, the anti-corrosion layer 30 may be a PVC layer. Alternatively, the anti-corrosion layer 30 may be a TPU layer. Alternatively, the anti-corrosion layer 30 may be stacked as two layers, with each layer being a PET layer and a PVC layer. Alternatively, the anti-corrosion layer 30 may be stacked as three layers, with each layer being a PET layer, a PVC layer, and a TPU layer.

[0084] In some embodiments, the adhesive layer 330 can be glue, solid glue, etc. The adhesive layer 330 can be a single-material adhesive or a composite-material adhesive. This application embodiment does not limit the material of the adhesive layer 330, as long as it ensures sufficient adhesion to prevent the adhesive layer 330 and the anti-corrosion layer 30 from detaching from the individual battery cell 10.

[0085] like Figure 8 The figure shows a voltage (volts) versus time (days) comparison curve for a single-cell battery 10 with and without the anti-corrosion layer 30 under high temperature and high humidity conditions. It can be seen that after approximately 15 days, the voltage of the single-cell battery 10 without the anti-corrosion layer 30 gradually decreases under high temperature and high humidity conditions, reaching 0 after approximately 21 days. At this point, the single-cell battery 10 will fail. The voltage of the single-cell battery 10 with the anti-corrosion layer 30 remains relatively stable under high temperature and high humidity conditions. Therefore, the reliability of the single-cell battery 10 with the anti-corrosion layer 30 is significantly improved.

[0086] like Figure 6 and Figure 7 As shown, in some embodiments, the positive terminal 110 and / or the negative terminal 120 are provided with a top cover 50. The top cover 50 includes a main body 510 and a bent portion 520. The main body 510 is spaced apart from the electrode assembly 60 of the single cell 10. One end of the bent portion 520 is connected to the main body 510, and the other end extends toward the electrode assembly 60 and is electrically connected to the electrode assembly 60. On the side away from the electrode assembly 60, at least a portion of the main body 510 forms a welding area 140, and the remaining portion of the main body 510 and the bent portion 520 form a non-welding area 130.

[0087] Understandably, at least a portion of the main body 510 of the top cover 50 forms a welding area 140 for welding with the electrical connector 20 to achieve electrical power output. Specifically, the welding area 140 is formed in the central region of the main body 510, while the remaining regions of the main body 510 and the bend 520 form a non-welding area 130. The anti-corrosion layer 30 may be connected only to the non-welding area 130 on the main body 510. Alternatively, the anti-corrosion layer 30 may be connected to the non-welding areas 130 on both the main body 510 and the bend 520.

[0088] In some embodiments, the top cover 50 may be disposed at the positive terminal 110 of the individual battery cell 10. Alternatively, the top cover 50 may be disposed at the negative terminal 120 of the individual battery cell 10. Alternatively, the top cover 50 may be disposed at both the positive terminal 110 and the negative terminal 120 of the individual battery cell 10.

[0089] like Figure 7 As shown, the main body 510 is circular, and three bent portions 520 are spaced apart circumferentially around the main body 510. A connecting portion 530 is connected to the end of each bent portion 520 away from the main body 510. The connecting portion 530 is annular. The connecting portion 530 is electrically connected to the electrode assembly 60. The main body 510, the connecting portion 530, and the three bent portions 520 together form three through holes. An anti-corrosion layer 30 covers these three through holes.

[0090] In some embodiments, the connecting portion 530 of the top cover 50 does not make direct contact with the electrode assembly 60. In this case, the connecting portion 530 of the top cover 50 is electrically connected to the electrode assembly 60 through conductors such as explosion-proof plates and perforated plates.

[0091] In some embodiments, the anti-corrosion layer 30 is attached to the bending portion 520. In this case, the anti-corrosion layer 30 is inclined along the inclined direction of the bending portion 520. That is, in the region connected to the main body portion 510, the anti-corrosion layer 30 is horizontally positioned. In the region connected to the bending portion 520, the anti-corrosion layer 30 is inclined and recessed towards the electrode assembly 60.

[0092] In some embodiments, the anti-corrosion layer 30 is spaced apart from the bending portion 520. In this case, the area where the anti-corrosion layer 30 connects to the main body 510 and the area covering the bending portion 520 are both horizontally positioned. It should be noted that the end of the anti-corrosion layer 30 away from the main body 510 can be bonded to the first extension 410 or the second extension 420. This ensures reliable fixation of the anti-corrosion layer 30 and allows it to cover the exposed areas of the positive end 110 or the negative end 120, effectively providing anti-corrosion protection.

[0093] When the anticorrosion layer 30 is attached to the bent portion 520, the anticorrosion layer 30 will not be able to cover the first extension portion 410 or the second extension portion 420 of the sleeve 40, and water vapor can enter the single battery cell 10 from the connection between the first extension portion 410 or the second extension portion 420 and the sealing member. However, based on the arrangement of the anticorrosion layer 30, the corrosion resistance of the single battery cell 10 can be improved to a certain extent. When the anticorrosion layer 30 is arranged apart from the bent portion 520, the anticorrosion layer 30 can cover the first extension portion 410 or the second extension portion 420 of the sleeve 40. At this time, water vapor can be prevented from entering the single battery cell 10 from the connection between the first extension portion 410 or the second extension portion 420 and the sealing member. Therefore, in the embodiments of the present application, the anticorrosion layer 30 is preferably arranged apart from the bent portion 520, and the anticorrosion layer 30 is at least partially connected to the first extension portion 410 or the second extension portion 420.

[0094] In another aspect, the embodiments of the present application also provide a battery pack. The battery pack comprises the single battery cell 10 as in the foregoing embodiments.

[0095] In some embodiments, the anticorrosion layer 30 is connected to the non-welding area 130 of the positive electrode end 110 and the non-welding area 130 of the negative electrode end 120, so that the anticorrosion layer 30 plays a corrosion protection effect on the positive electrode end 110 and the negative electrode end 120 of the single battery cell 10. Therefore, the corrosion resistance of the battery pack can be improved, and the service life of the battery pack in a high-temperature and high-humidity environment can be prolonged.

[0096] The embodiments of the present application are described in detail above, and the principles and implementation modes of the present application are described by applying specific examples. The above description of the embodiments is only used to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed, and the above description should not be understood as a limitation of the present application.

Claims

1. A monobloc cell, characterized in that, The monomer battery has a positive electrode end and a negative electrode end, the positive electrode end and / or the negative electrode end has a non-welding area and a welding area configured to connect an electric connecting sheet, wherein the positive electrode end and / or the negative electrode end is provided with an anti-corrosion layer connected with the non-welding area, and the anti-corrosion layer has an avoiding hole corresponding to the welding area.

2. The monobloc cell of claim 1, wherein, The anti-corrosion layer covers the non-welding area.

3. The monobloc cell of claim 1, wherein, The monomer battery is provided in a cylindrical shape, the diameter of the monomer battery is D1, the anti-corrosion layer is provided in a circular ring shape, the inner diameter of the anti-corrosion layer is D2, the outer diameter is D3, the welding area is provided in a circular shape, the diameter of the welding area is D4, and the following conditions are met: D4≤D2<D3≤D1.

4. The monobloc cell of claim 3, wherein, The monomer battery is provided with a sleeve on the circumferential side, the sleeve has a first extension part extending to the positive electrode end and a second extension part extending to the negative electrode end, the anti-corrosion layer is connected with the side of the first extension part or the second extension part away from the monomer battery, wherein the first extension part and the second extension part are both circular ring shapes, the outer diameters of the first extension part and the second extension part are the same as the outer diameter of the monomer battery, the inner diameter of the first extension part is D5, the inner diameter of the second extension part is D8, and the following conditions are met: D4≤D2<D5<D3≤D1, D4≤D2<D8<D3≤D1.

5. The monobloc cell of claim 4, wherein, The difference between the outer diameter D3 of the anti-corrosion layer and the inner diameter D5 of the first extension part is δ1, and the following condition is met: δ1≥0.5 millimeter; or the difference between the outer diameter D3 of the anti-corrosion layer and the inner diameter D8 of the second extension part is δ2, and the following condition is met: δ2≥0.5 millimeter.

6. The monobloc cell of claim 3, wherein, The ratio of the inner diameter D2 of the anti-corrosion layer to the diameter D1 of the monomer battery is α, and the following condition is met: 15%≤α≤90%.

7. The monobloc cell of claim 3, wherein, The ratio of the outer diameter D3 of the anti-corrosion layer to the diameter D1 of the monomer battery is β, and the following condition is met: 70%≤β≤100%.

8. The monobloc cell of any one of claims 1-7, wherein, The side of the anti-corrosion layer facing the non-welding area is provided with a glue layer, and the glue layer is bonded to the non-welding area.

9. The monobloc cell of claim 8, wherein, The thickness of the anti-corrosion layer is D6, and the following condition is met: 0.02 millimeter≤D6≤0.2 millimeter.

10. The monobloc cell of claim 8, wherein, The thickness of the glue layer is D7, and the following condition is met: 0.01 millimeter≤D7≤0.13 millimeter.

11. The monobloc cell of claim 8, wherein, The anti-corrosion layer includes at least one of a PET layer, a PVC layer and a TPU layer.

12. The monobloc cell of any one of claims 1-7, wherein, The positive electrode end and / or the negative electrode end is provided with a top cover, the top cover includes a main body part and a bent part, the main body part is spaced apart from the electrode assembly of the monomer battery, one end of the bent part is connected with the main body part, the other end extends towards the direction of the electrode assembly and is electrically connected with the electrode assembly, wherein at least part of the area of the main body part away from the electrode assembly forms the welding area, and the remaining area of the main body part and the bent part form the non-welding area.

13. The monobloc cell of claim 12, wherein, The anti-corrosion layer is attached to the bent part.

14. The monobloc cell of claim 12, wherein, The anti-corrosion layer is spaced apart from the bent part.

15. A battery pack, characterized by The monomer battery includes the monomer battery according to any one of claims 1-14.

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