Battery cell and battery pack

Abstract

This application discloses a battery cell and a battery pack, relating to the field of battery technology. The battery cell includes a casing, a cover plate, terminals, and at least two electrode cores. The casing has an open end cavity, and the cover plate is disposed at the open end and is disposed through the cover plate. A receiving structure is provided on one end face of the terminal core facing the receiving cavity. The tabs of the at least two electrode cores overlap to form a superimposed portion, which is accommodated within the receiving structure. In the technical solution provided by the embodiments of this application, the receiving structure can compensate for the thickness of the tab overlap area, so that the overlap structure is pressed into the receiving structure under the pressure of the welding head. This ensures that the welding head contacts the position to be welded, achieving reliable welding, avoiding problems such as incomplete welding, and ensuring the reliability of the welding.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell and a battery pack. Background Technology

[0002] Square batteries are a common type of lithium-ion battery, widely used in electric vehicles, energy storage systems, and consumer electronics due to their regular rectangular shape and high space utilization. Their casings are typically made of aluminum alloy or stainless steel, providing good mechanical strength and sealing to effectively protect the internal cells from external environmental influences. Furthermore, their internal structure often employs lamination or winding processes, combined with advanced thermal management systems, enabling efficient energy output and heat dissipation.

[0003] The electrodes of the internal battery cell are led out through the tabs at their ends and welded to the battery terminals to achieve electrical connection. The tabs welded to the same terminal will overlap in some areas at their ends. The thickness of the overlapping tabs increases, which makes it easy for the tabs and terminals to have poor solder joints and the solder joints to be weak. Utility Model Content

[0004] Several embodiments in this application propose a battery cell and a battery pack, aiming to provide a terminal structure that can ensure a firm weld between the tab and the terminal post and is less prone to poor welding.

[0005] One embodiment of this application proposes a battery cell comprising:

[0006] A housing with an open end cavity;

[0007] A cover plate is provided at the opening of the housing;

[0008] An electrode post, penetrating through the cover plate, has a receiving structure on one end face facing the receiving cavity; and

[0009] At least two pole pieces, the tab portions of the at least two pole pieces overlap to form a superimposed portion, the superimposed portion being housed within the housing structure.

[0010] In one embodiment, the width of the receiving structure along the direction perpendicular to the pole core is greater than the width of the overlapping portion along the direction perpendicular to the pole core.

[0011] In one embodiment, the depth of the receiving structure is greater than the thickness of the overlapping portion.

[0012] In one embodiment, the pole includes a pole body and a pole plate, the pole plate being located at the end of the pole body facing the housing, and the receiving structure being disposed on the pole plate.

[0013] In one embodiment, the electrode post includes a positive electrode post and a negative electrode post, and each of the two electrode posts is provided with the receiving structure.

[0014] In one embodiment, the housing includes a shell and a cover plate covering an opening in the shell, the pole is disposed through the cover plate, and the receiving structure extends along the length direction of the cover plate.

[0015] In one embodiment, the battery cell further includes a lower plastic part, which is disposed on the side of the cover plate facing the receiving cavity. The cover plate has a first through hole, and the lower plastic part has a second through hole. The first through hole and the second through hole are connected, and the electrode post passes through the first through hole and the second through hole.

[0016] In one embodiment, the battery cell further includes an upper plastic part, which is disposed on the side of the cover plate facing away from the lower plastic part, and each of the terminals is disposed through the upper plastic part.

[0017] In one embodiment, the cover plate is formed with an explosion-proof valve, which is spaced apart from the pole post.

[0018] One embodiment of this application also proposes a battery pack comprising at least one battery cell as described above.

[0019] In several embodiments provided in this application, a receiving structure is provided at the first end face where the electrode post and the electrode tab are welded, so that the overlapping portion of multiple electrode tabs welded to the first end face of the electrode post, that is, the portion of the structure that is significantly thicker than a single electrode tab, can be accommodated within the receiving structure, thereby ensuring the reliability of the welding between the electrode tab and the electrode post. Specifically, the battery cell includes a casing, a cover plate, an electrode post, and a cell body. The casing has a receiving cavity with an open end, and the cover plate is disposed at the open end and is disposed through the cover plate. A receiving structure is provided at the end face of the electrode post facing the receiving cavity. The cell body includes at least two electrode cores, each electrode core having an electrode tab. Each electrode tab is welded to the electrode post, and the electrode tabs of adjacent two electrode cores partially overlap to form a superimposed portion, which is accommodated within the receiving structure. Ultrasonic welding is commonly used for welding tabs and poles. However, the thickness of the overlapping portion of the two tabs is significantly increased. The welding head can only weld this area of ​​the structure and cannot weld the actual contact position between the tab and the pole, resulting in a false weld. In the technical solution of this application, the receiving structure can compensate for the thickness of the overlapping portion, so that the overlapping portion is pressed into the receiving structure under the pressure of the welding head. This ensures that the welding head contacts the position to be welded, achieving reliable welding, avoiding problems such as false welds, and ensuring the reliability of the welding. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments or prior art of this application, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a single battery cell provided in this application;

[0022] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0023] Figure 3 for Figure 1 Schematic diagram of the middle cover plate;

[0024] Figure 4 for Figure 1 Cross-sectional view of the middle cover plate;

[0025] Figure 5 This is a schematic diagram of the welding structure between the electrode tab and the electrode post;

[0026] Figure 6 for Figure 5 A magnified view of a section at point B in the middle;

[0027] Figure 7 This is a cross-sectional view of the cover plate from another angle.

[0028] Figure 8 This is a schematic diagram of the structure of an embodiment of the battery pack provided in this application.

[0029] Explanation of icon numbers:

[0030] 100. Battery cell; 1a. First through hole; 1b. Receiving cavity; 11. Shell; 12. Cover plate; 121. Explosion-proof valve; 122. Injection hole; 2. Terminal post; 21. Receiving structure; 22. Terminal post body; 23. Terminal post plate; 2a. First end face; 2b. Second end face; 3. Cell body; 31. Electrode core; 311. Electrode tab; 312. Overlapping part; 313. Welding part; 4. Lower plastic part; 4a. Second through hole;

[0031] 1000, Battery pack; 200, Battery pack upper shell; 300, Battery pack lower shell. Detailed Implementation

[0032] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of several embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0033] It should be noted that if multiple embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0034] Furthermore, if multiple embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text implies three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0035] In the battery cell 100, the electrode sheet of the internal cell is led out through the tab 311 at its end and welded to the battery terminal 2 to achieve electrical connection. The tabs 311 welded to the same terminal 2 will overlap in some areas at their ends. The thickness of the overlapped tab 311 increases, which makes it easy for the tab 311 and the terminal 2 to have poor solder joints and the solder joint is not strong.

[0036] To address the aforementioned problems, this application proposes a battery cell 100 to solve the above-mentioned technical issues.

[0037] Please see Figures 1 to 7 In one embodiment of this application, the battery cell 100 includes a housing 11, a cover plate 12, an electrode post 2, and at least two electrode cores 31. The housing 11 has an open end cavity, the cover plate 12 is disposed at the open end, and is disposed through the cover plate 12. The end face of the electrode post 2 facing the cavity is provided with a receiving structure 21. The tabs 311 of the at least two electrode cores 31 partially overlap to form a stacked portion 312, which is accommodated in the receiving structure 21.

[0038] Taking a stacked battery as an example, its internal structure consists of multiple layers of positive and negative electrode plates and separators stacked alternately, which can effectively improve the energy density and power output of the battery. Each positive electrode plate in a stacked battery has a positive tab, and each negative electrode plate has a negative tab. The electrode core 31, which is composed of multiple positive electrode plates, multiple layers of separator, and multiple positive electrode plates stacked in a certain arrangement, has two positive and negative tabs, respectively composed of multiple positive tabs and multiple negative tabs, hereinafter referred to as tabs 311. When the electrode core 31 is installed in the same battery cell 100, the positive and negative tabs of each electrode core 31 need to be welded to the positive and negative terminals of the battery to achieve electrical connection with the external circuit.

[0039] It is understandable that the main function of the battery terminal 2 is to connect to the positive and negative electrode tabs 311 of the battery core 31 by welding, and to connect to the external circuit by welding to the second end face 3b of the terminal 2 via a busbar, thereby realizing the charging and discharging of the battery. When the tabs 311 of different cores 31 are welded to the same terminal 2, the thickness of the overlapping tab 311 portion will inevitably increase. When the welding head contacts the thickened overlapping portion 312, it cannot contact the thinner area that actually needs to be welded, resulting in a weak weld and poor weld strength. However, with the terminal 2 structure proposed in this application, when the welding head is pressed down until it abuts against the tab 311, because the tab 311 is a deformable structure, the overlapping portion 312 will be squeezed into the receiving structure 21 under pressure. At this time, it can be ensured that the welding head contacts the non-overlapping portion 312 area of ​​the tab 311, ensuring the reliability of the weld.

[0040] Generally, tab 311 and post 2 are typically joined using ultrasonic welding. An ultrasonic welding device is used to align the welding head with the overlapping area of ​​tab 311. The high-frequency vibration of the ultrasonic waves generates localized high temperatures at the contact surface of the tab 311 material, thereby melting and bonding the materials. During the welding process, precise control of welding parameters, such as welding time, amplitude, and pressure, is required to ensure weld quality. This welding method not only enables rapid and efficient connection of tab 311 but also provides good weld strength and electrical conductivity.

[0041] In several embodiments provided in this application, a receiving structure 21 is provided on the first end face 2a where the electrode post 2 is welded to the tab 311. This allows the overlapping portion of the multiple tabs 311 welded to the first end face 2a of the electrode post 2, i.e., the portion of the structure that is significantly thicker than a single tab 311, to be accommodated within the receiving structure 21, thereby ensuring the reliability of the welding between the tab 311 and the electrode post 2. Specifically, the battery cell 100 includes a cover plate 12, a lower plastic part 4, and an electrode post 2. The lower plastic part 4 is disposed on one side of the cover plate 12, and the electrode post 2 is disposed through the lower plastic part 4 and the cover plate 12. The electrode post 2 has a first end face 2a located on the side of the lower plastic part 4 facing away from the cover plate 12, and the receiving structure 21 is provided on the first end face 2a. The welding of tabs 311 and pole posts 2 is usually done using ultrasonic welding. The thickness of the overlapping area of ​​the two tabs 311 is significantly increased. The welding head can only weld the structure in this area, but cannot weld the actual contact position between the tabs 311 and pole posts 2, resulting in a false weld. In the technical solution of this application, the receiving structure 21 can compensate for the thickness of the overlapping area of ​​the tabs 311, so that the overlapping structure will be pressed into the receiving structure 21 under the pressure of the welding head. This ensures that the welding head contacts the position to be welded, achieves reliable welding, avoids problems such as false welds, and ensures the reliability of the welding.

[0042] It should be noted that the receiving structure 21 located on the first end face 2a of the pole post 2 can be circular, elliptical, or strip-shaped. This application does not impose any restrictions on this, and it can be adaptively adjusted according to actual shape requirements and processing difficulty. It is only necessary to ensure that the projection of the overlapping portion of the pole lug 311 in the direction perpendicular to the cover plate 12 is completely within the receiving structure 21, and that the depth of the receiving structure 21 is greater than or equal to the thickness of the overlapping portion. In one embodiment of this application, the receiving structure 21 is strip-shaped. For details, please refer to further reference. Figure 1 The receiving structure 21 is an open slot, meaning that both ends of the receiving structure 21 have openings. Since the pole post 2 is made of metal, the receiving structure 21 is machined by CNC milling. This open slot design simplifies the machining process and improves production efficiency. During the CNC machine tool's feed, the open slot facilitates the entry and exit of the tool, avoiding machining dead angles or tool interference problems that may be caused by a closed slot.

[0043] It is understood that, in the direction perpendicular to the cover plate 12, the first end face 2a of the pole post 2 can be flush with the side of the lower plastic part 4 facing away from the cover plate 12, or it can be lower than the side of the lower plastic part 4 facing away from the cover plate 12. This application does not limit this. In one embodiment of this application, the first end face 2a of the pole post 2 is lower than the bottom surface of the lower plastic part 4. For details, please refer to further reference. Figure 2 and Figure 3The first end face 2a of the electrode post 2 is significantly lower than the bottom surface of the lower plastic part 4. By misaligning the first end face 2a of the electrode post 2 with the bottom surface of the lower plastic part 4, the first end face 2a protrudes more from the lower plastic part 4, thus facilitating the welding of the tab 311 to the first end face 2a of the electrode post 2 and preventing the lower plastic part 4 from obstructing the welding process. Furthermore, by making the first end face 2a protrude from the lower plastic part 4, it avoids unnecessary wear over time caused by part of the structure of the tab 311 contacting the first end face 2a after it is welded to it. For more details, please refer to [further details omitted]. Figure 4 As shown in the figure, the first end face 2a of the electrode tab 311 and the bottom surface of the lower plastic part 4 are misaligned, thereby forming an installation gap between the electrode tab 311 and the lower plastic part 4, thus avoiding unnecessary contact between the electrode tab 311 and the lower plastic part 4.

[0044] In the technical solution of this application, the electrode post 2 includes a positive electrode post and a negative electrode post arranged at intervals. For details, please refer to further reference. Figure 1 The positive and negative electrode posts 2 are spaced apart along the length of the cover plate 12, and the receiving structure 21 also extends along the length of the cover plate 12. This ensures that the overlapping portion formed by the overlapping tabs 311 of different electrode cores 31 can be located within the receiving structure 21, preventing the overlapping portion from pressing against the welding head and causing incomplete welding in other areas of the tabs 311. It should be noted that the width and depth of the receiving structure 21 are not limited in this application and can be adapted according to actual needs. However, it should be noted that the minimum design width of the receiving structure 21 must be greater than or equal to the width of the overlapping portion, that is, the dimension of the overlapping portion along the direction of the arrangement of the two electrode cores 31; and the minimum design depth of the receiving structure 21 must be greater than or equal to the thickness of the overlapping portion, that is, the dimension of the overlapping portion along the direction perpendicular to the cover plate 12. This ensures that when the welding head presses down on the overlapping portion, the overlapping portion can be completely contained within the receiving structure 21, thereby allowing the welding head to contact the non-overlapping area of ​​the tabs 311 to achieve welding.

[0045] In the embodiments of this application, to ensure that the terminal post 2 can smoothly enter the interior of the housing 11, the cover plate 12 is designed with a first through hole 1a, and the lower plastic part 4 is designed with a second through hole 4a. Specifically, the first through hole 1a and the second through hole 4a are connected, and the terminal post 2 is sequentially disposed through the first through hole 1a and the second through hole 4a. Since the cover plate 12 is made of metal, if the terminal post 2 is in direct contact with the cover plate 12, it is easy to cause a short circuit between the positive and negative terminals 2, thereby causing battery failure. Therefore, the diameter of the second through hole 4a is designed to be smaller than that of the first through hole 1a, so as to ensure that the lower plastic part 4 can effectively support the terminal post 2, avoid direct contact between the terminal post 2 and the cover plate 12, and thus prevent short circuit. The terminal post 2 includes a terminal post body 22 and a terminal post plate 23. The terminal post plate 23 is disposed at the end of the terminal post body 22 facing the inner electrode core, and the receiving structure 21 is disposed on the terminal post plate 23 to accommodate the overlapping electrode tab 311 structure.

[0046] To further ensure that the upper part of the terminal post 2 does not contact the cover plate 12, in one embodiment of this application, the battery cell 100 also includes an upper plastic part 5. The upper plastic part 5 is disposed on the side of the cover plate 12 opposite to the lower plastic part 4, i.e., the exposed side. Both the upper plastic part 5 and the lower plastic part 4 are made of insulating material, and the diameter of the through hole in the upper plastic part 5 is smaller than that of the first through hole 1a. With this design, the terminal post 2 is fixed by the upper plastic part 5 and the lower plastic part 4, ensuring that the terminal post 2 will not contact the cover plate 12, thereby effectively avoiding the risk of short circuit. In addition, the upper plastic part 5 not only provides physical protection for the battery, preventing damage to the internal components of the battery from external mechanical impacts and environmental factors, but also enhances the sealing performance of the battery, ensuring the isolation between the battery interior and the external environment, and providing a stable chemical environment for the normal operation of the battery.

[0047] In a square battery, the lower plastic component 4 is typically located on the side of the cover plate 12 facing the internal battery cell, i.e., at the bottom of the battery cover plate 12, and fits tightly with the battery casing and the battery cell. The lower plastic component 4 primarily serves to provide structural support, ensuring the overall stability of the battery; secondly, through its designed liquid passage holes and elastic components, it optimizes the electrolyte injection process, preventing electrolyte overflow during injection and subsequent processes, and ensuring consistency in the amount of electrolyte injected; thirdly, it enhances the battery's sealing performance, preventing external moisture and impurities from entering the battery, while also preventing electrolyte evaporation. Furthermore, the lower plastic component 4 also has a second through hole 4a for engaging the positive and negative terminals 2, ensuring the battery's electrical connection. Therefore, the sidewall of the terminal 2 only abuts against the lower plastic component 4 and does not contact the cover plate 12, thus avoiding short circuits caused by contact between the cover plate 12 and the terminal 2.

[0048] In one embodiment of this application, to ensure the sealing performance and safety of the battery, a sealing ring (not shown in the figure) is specially provided between the terminal post 2 and the cover plate 12. This sealing ring is fitted onto the terminal post 2 and precisely installed within the first through hole 1a of the cover plate 12. The inner peripheral wall of the sealing ring tightly fits against the outer peripheral wall of the terminal post 2, while its outer peripheral wall abuts against the inner peripheral wall of the first through hole 1a, thereby effectively filling the gap between the terminal post 2 and the cover plate 12. This design not only provides good sealing protection for the battery cell body 3 inside the battery, preventing damage to the cell from the external environment, but also ensures the stability of the internal chemical environment of the battery, thereby guaranteeing the normal operation and service life of the battery. Furthermore, the sealing ring also plays an important insulating role, preventing the terminal post 2 from directly contacting the metal cover plate 12 and causing a short circuit, thereby effectively avoiding potential battery failures and further improving the safety and reliability of the battery.

[0049] In one embodiment of this application, the cover plate 12 is further provided with an explosion-proof valve 121. For details, please refer to further reading. Figure 1 The explosion-proof valve 121 has a pressure relief cover at its opening. The main function of the explosion-proof valve 121 on the cover 12 is to automatically open and release pressure when the internal pressure of the battery abnormally increases, preventing the battery from exploding or being damaged due to excessive internal pressure. This design helps protect battery safety, ensuring that the battery will not experience dangerous accidents under overcharging, overheating, or other abnormal conditions. The explosion-proof valve 121 protects system equipment, controls system pressure, prevents system accidents, and balances system pressure. The pressure relief cover 12 features a thinned, etched design, allowing it to rupture rapidly through these weak points when the internal pressure of the battery rises to a certain level, thereby releasing pressure and preventing battery explosion.

[0050] In the embodiments of this application, to meet the requirements of electrolyte injection during battery assembly, the cover plate 12 is specially designed with an injection hole 122. This injection hole 122 is put into use after the welding process between the housing 11 and the cover plate 12 is completed, for accurately injecting electrolyte into the battery. After the electrolyte injection is completed, a sealing pin is firmly welded to the injection port using laser welding technology, thereby ensuring complete isolation between the battery interior and the external environment, providing a stable and necessary chemical environment for the normal operation of the battery, and effectively preventing electrolyte leakage. In addition, the injection hole 122 also has another function: during the sealing check after the welding process of the cover plate 12 is completed, helium gas is introduced through this hole to detect the pressure changes inside the battery, thereby accurately determining whether the sealing performance of the welded part 313 meets the requirements, ensuring the overall quality and safety of the battery.

[0051] The battery cell 100 proposed in this application includes a cell body 3. It should be noted that the cell body 3 can be composed of two electrode cores 31, or it can be composed of two or more electrode cores 31. This application does not impose any limitation on this. In one embodiment of this application, the cell body 3 includes two electrode cores 31. For details, please refer to further reference. Figure 4 and Figure 6 Each electrode core 31 is provided with two tabs 311, namely a positive tab and a negative tab. During welding, the two positive tabs of the two electrode cores 31 are welded from both sides of the positive electrode post to the first end face 2a of the positive electrode post, and the two negative tabs of the two electrode cores 31 are welded from both sides of the negative electrode post to the first end face 2a of the negative electrode post. The two tabs 311 of the same polarity partially overlap to form the aforementioned overlapping part 312. After welding, the overlapping part 312 is accommodated in the accommodating structure 21 to avoid affecting the welding.

[0052] This application does not limit the structure of each electrode core 31 in the main body 3 of the battery cell. In one embodiment, its structure mainly consists of a positive electrode, a negative electrode, a separator, and an electrolyte. In stacked batteries, the positive and negative electrodes are usually made of metal foil, such as aluminum foil and copper foil, as current collectors, while the active material is coated on these foils. The separator is made of materials such as polyolefin, which has good chemical stability and mechanical strength, preventing short circuits. During the manufacturing process, the positive electrode, separator, and negative electrode are stacked sequentially. The separator isolates the positive and negative electrodes and prevents short circuits, while allowing lithium ions to pass through to complete the electrochemical reaction. During the stacking process, the separator can be folded in a Z-shape to alternately stack the positive and negative electrodes to form a stable electrode core structure. This arrangement not only ensures the ion conduction path inside the battery but also enhances the battery's safety through the microporous structure of the separator, such as limiting current in the case of overheating or overcharging to prevent thermal runaway. The separator, positive electrode, and negative electrode are stacked in sequence, forming the smallest energy storage unit. Two or more electrode cores 31 arranged in an array constitute the aforementioned cell body 3. Subsequently, the stacked cell body 3 is installed into the casing 11 of the battery cell 100, and electrolyte is injected. After sealing, formation, and other processes, a stacked battery is finally manufactured.

[0053] This application also proposes a battery pack 1000, which includes a battery pack shell and battery cells 100 disposed within the battery pack shell. The battery pack shell is composed of an upper battery pack shell 200 and a lower battery pack shell 300. It is understood that the battery pack is obtained by electrically connecting and arranging multiple battery cells 100 according to a certain pattern. Multiple battery cells 100 are installed inside the battery pack shell in a parallel or array arrangement and are electrically connected through a busbar. The busbar is installed and fixed to the outside of the terminal post 2 using connection methods such as screwing, snap-fitting, welding, or interference fit. This battery pack can be used as a power source for electrical devices or as an energy storage unit for electrical devices. Electrical devices can include mobile devices (e.g., mobile phones, laptops), electric vehicles (e.g., pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, range-extended vehicles, electric bicycles, electric scooters, electric golf carts, electric trucks, etc.), electric trains, ships and satellites, energy storage systems, etc., but are not limited to these. The specific structure of the battery cell 100 is as described in the above embodiments. Since the battery pack 1000 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0054] The above description is merely an exemplary embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A battery cell, characterized in that, include: The housing (11) has an accommodating cavity (1b) with an open end; A cover plate (12) is provided at the opening of the housing (11); A pole post (2) is provided through the cover plate (12), and a receiving structure (21) is provided on one end face of the pole post (2) facing the receiving cavity (1b); as well as At least two pole pieces (31) have their tabs (311) partially overlapping to form a superimposed portion (312), which is accommodated within the accommodating structure (21).

2. The battery cell as described in claim 1, characterized in that, The width of the receiving structure (21) in the direction perpendicular to the pole core (31) is greater than the width of the overlapping portion (312) in the direction perpendicular to the pole core (31).

3. The battery cell as described in claim 2, characterized in that, The depth of the receiving structure (21) is greater than the thickness of the overlapping portion (312).

4. The battery cell as described in claim 1, characterized in that, The pole post (2) includes a pole post body (22) and a pole post plate (23). The pole post plate (23) is located at one end of the pole post body (22) facing the housing (11). The receiving structure (21) is disposed on the pole post plate (23).

5. The battery cell as described in claim 1, characterized in that, The pole (2) includes a positive pole and a negative pole, and each of the two poles (2) is provided with the receiving structure (21).

6. The battery cell according to any one of claims 1 to 5, characterized in that, The receiving structure (21) extends along the length direction of the cover plate (12).

7. The battery cell as described in claim 6, characterized in that, The battery cell also includes a lower plastic part (4), which is disposed on the side of the cover plate (12) facing the receiving cavity. The cover plate (12) has a first through hole (1a), and the lower plastic part (4) has a second through hole (4a). The first through hole (1a) and the second through hole (4a) are connected. The electrode post (2) passes through the first through hole (1a) and the second through hole (4a).

8. The battery cell as described in claim 7, characterized in that, The battery cell also includes an upper plastic part (5), which is located on the side of the cover plate (12) facing away from the lower plastic part (4), and each of the pole posts (2) is disposed through one of the upper plastic parts (5).

9. The battery cell as described in claim 6, characterized in that, The cover plate (12) is provided with an explosion-proof valve (121), which is spaced apart from the pole (2).

10. A battery pack, characterized in that, It includes at least one battery cell (1000) as described in any one of claims 1 to 9.

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