Battery monomer, battery module and battery
By designing a non-overlapping structure between the terminals and the poles in the battery cell and an anti-torsion part to restrict rotation, the problem of small contact area between the terminals and the battery plate in the battery module is solved, achieving better overcurrent and heat dissipation capabilities and electrical connection stability, and supporting high-rate charging and discharging.
Patent Information
- Application Number
- CN202423184380.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2034-12-20
AI Technical Summary
In the existing technology, the design of the battery module leads to contact between the terminals and the battery plate, resulting in poor stability of the electrical connection and poor heat dissipation capacity of the battery module, making it difficult to achieve high-rate charging and discharging.
A battery cell structure was designed, wherein the electrode post passes through the first connection hole of the cover plate and the second connection hole of the terminal. The axis of the electrode post coincides with the axis of the first and second connection holes, but the axis of the terminal and the electrode post do not coincide, which increases the welding area between the terminal and the plate, and restricts the relative rotation of the terminal and the electrode post through plastic parts and non-circular anti-torsion parts.
Without changing the terminal size, the welding area between the terminal and the battery plate was increased, improving the overcurrent and heat dissipation capabilities, enhancing the high-rate charge and discharge performance of the battery module, and strengthening the stability of the electrical connection.
Smart Images
Figure CN223693223U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of batteries, in particular to a battery monomer, a battery module and a battery. BACKGROUND
[0002] The information disclosed in this Background section is only for the purpose of enhancing the understanding of the general background of the present disclosure and does not necessarily represent the prior art known to those skilled in the art.
[0003] The battery module is an important component of power batteries and energy storage batteries. The busbar in the battery module serves as a connector between battery monomers, is used for welding with the terminals of the battery monomers, and plays a role in electrically connecting multiple battery monomers. However, the terminals and the pole of the battery monomer currently adopt a center coincidence design, which results in a small area of the terminals welded with the busbar, thereby being not conducive to overcurrent and heat dissipation, and it is difficult to achieve high-rate charging and discharging of the battery module. CONTENT OF THE UTILITY MODEL
[0004] Therefore, the purpose of the present application is to provide a battery monomer, a battery module and a battery, which aims to solve the technical problem of poor overcurrent and heat dissipation capacity of the terminals in the battery monomer.
[0005] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:
[0006] In a first aspect, the embodiments of the present application provide a battery monomer, comprising:
[0007] A shell having a receiving cavity and an opening in communication;
[0008] An electrode assembly arranged in the receiving cavity;
[0009] A cover plate assembly comprising a cover plate, a pole and a terminal, the cover plate being connected to the shell to cover the opening, the cover plate having a first connecting hole penetratingly arranged thereon, the terminal being connected to a side of the cover plate away from the electrode assembly and being arranged in insulation with the cover plate, the terminal having a second connecting hole penetratingly arranged thereon, the pole being arranged in the first connecting hole and the second connecting hole respectively and being arranged in insulation with the cover plate, one end of the pole being electrically connected to the electrode assembly, the end of the pole away from the electrode assembly being electrically connected to the terminal, the axis of the pole, the axis of the first connecting hole and the axis of the second connecting hole being coincident, and the axis of the second connecting hole and the axis of the terminal being non-coincident.
[0010] In one of the embodiments of the first aspect, the cover plate assembly further comprises a plastic member connected between the cover plate and the terminal, a third connecting hole is formed through the plastic member, an axis of the third connecting hole coincides with the axis of the second connecting hole, the pole passes through the third connecting hole, a first groove is formed on the side of the cover plate close to the terminal and communicates with the first connecting hole, a first anti-torsion part is formed on the side of the plastic member close to the cover plate, the first anti-torsion part is arranged at the first groove, and the first anti-torsion part and the first groove are both non-circular to limit the relative rotation between the plastic member and the cover plate.
[0011] In one of the embodiments of the first aspect, a second groove is formed on the side of the cover plate close to the terminal, a second anti-torsion part is formed on the side of the plastic member close to the cover plate, the second anti-torsion part is arranged at the second groove, and the second anti-torsion part is spaced from the first anti-torsion part.
[0012] In one of the embodiments of the first aspect, the thickness of the cover plate is T1, the depth of the first groove and / or the second groove is H1, and 0.3≤H1 / T1≤0.5 is satisfied.
[0013] In one of the embodiments of the first aspect, the second anti-torsion part and the second groove are both provided in plurality, two adjacent second anti-torsion parts are spaced from each other, two adjacent second grooves are spaced from each other, and each second anti-torsion part is arranged at a second groove.
[0014] In one of the embodiments of the first aspect, a third groove is formed on the side of the plastic member away from the cover plate, the terminal is arranged at the third groove, and the third groove and the terminal are both non-circular to limit the relative rotation between the terminal and the plastic member.
[0015] In one of the embodiments of the first aspect, the dimension of the plastic member in the thickness direction of the cover plate is T2, the depth of the third groove is H2, and 0.6≤H2 / T2≤0.8 is satisfied.
[0016] In one of the embodiments of the first aspect, the distance between the axis of the second connecting hole and the axis of the terminal is L, and 3mm≤L≤8mm is satisfied.
[0017] In the second aspect, the embodiments of the present application provide a battery monomer, which comprises the battery monomer in any one of the embodiments of the first aspect.
[0018] In the third aspect, the embodiments of the present application provide a battery, which comprises the battery module in any one of the embodiments of the second aspect.
[0019] The beneficial effects of this application are as follows:
[0020] The battery cell provided in this application has its terminals passing through the first connecting hole and the second connecting hole of the terminal respectively. The axis of the terminal, the axis of the first connecting hole and the axis of the second connecting hole coincide, while the axis of the second connecting hole and the axis of the terminal do not coincide. This causes the center of the terminal to be offset from the center of the terminal. This increases the welding area between the terminal and the battery without changing the terminal size, thereby improving the current carrying capacity and heat dissipation capacity of the terminal, and making it easier to achieve high-rate charging and discharging of the battery module.
[0021] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0023] Figure 1 This paper shows a schematic diagram of the cover plate assembly from one perspective in one embodiment of the present application;
[0024] Figure 2 This paper shows a schematic diagram of the cover plate assembly from another perspective in one embodiment of the present application;
[0025] Figure 3 This illustration shows another perspective structural diagram of the cover plate assembly in one embodiment of the present application;
[0026] Figure 4 It shows Figure 3 Schematic diagram of the cross-sectional structure at point AA;
[0027] Figure 5 It shows Figure 4 A magnified structural diagram of region B in the middle;
[0028] Figure 6 This illustration shows another perspective structural diagram of the cover plate assembly in one embodiment of the present application;
[0029] Figure 7 It shows Figure 6 A schematic diagram of the cross-sectional structure at the CC section;
[0030] Figure 8 An exploded structural diagram of a cover plate assembly according to one embodiment of this application is shown;
[0031] Figure 9 A perspective view of a plastic part in one embodiment of the present application is shown.
[0032] Main element symbol explanation:
[0033] 100 - cover plate assembly; 110 - cover plate; 111 - first connecting hole; 112 - first groove; 113 - second groove; 120 - pole; 130 - terminal; 131 - second connecting hole; 140 - plastic part; 141 - third connecting hole; 142 - first anti-torsion part; 143 - second anti-torsion part; 144 - third groove. DETAILED DESCRIPTION
[0034] Embodiments of the present application are described below in detail, examples of which are shown in the accompanying drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, and are used only for explaining the present application, and cannot be understood as a limitation of the present application.
[0035] In the description of the present application, the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "height", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.
[0036] In addition, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be that the first feature and the second feature are in direct contact, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.
[0037] In the description of the present application, the terms "first", "second" and the like are used to distinguish different objects, and cannot be understood as indicating or implying a specific order or primary and secondary relationship, or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.
[0038] In the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0039] In the description of the present application, the term "and / or" indicates that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / ", in general, indicates that the front and rear associated objects are in an "or" relationship.
[0040] In the description of the present application, "parallel" not only includes the case of absolute parallel, but also includes the case of approximate parallel which is generally recognized in engineering; at the same time, "vertical" not only includes the case of absolute vertical, but also includes the case of approximate vertical which is generally recognized in engineering. Illustratively, the included angle between two directions is 80°-90°, which can be considered as vertical; the included angle between two directions is 0°-10°, which can be considered as parallel.
[0041] The battery module is an important part of the power battery and the energy storage battery. The busbar is used as a connector between the battery monomers in the battery module, and is used for welding with the terminal of the battery monomer, thereby playing a role of electrically connecting a plurality of battery monomers. However, the terminal and the pole of the battery monomer currently adopt a center coincidence design, which results in a small welding area of the terminal and the busbar, thereby being not conducive to overcurrent and heat dissipation, and being difficult to realize high-rate charging and discharging of the battery module. In addition, the existing battery monomer also has the following problems: the terminal and the pole are prone to relative rotation, thereby being not conducive to the stability of the electrical connection of the terminal and the pole.
[0042] In order to solve the above technical problems, in a first aspect, embodiments of the present application provide a battery monomer, relating to the technical field of battery, mainly applied in a battery module, the battery module is applied in a battery, for example, a power battery, an energy storage battery and the like, wherein the power battery is applied in an electric device, and the energy storage battery is applied in an energy storage device.
[0043] It should be noted that the electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile, a new energy automobile, etc. The new energy automobile can be a pure electric automobile, a hybrid electric automobile and a range extended automobile, etc. The spacecraft can be an airplane, a rocket, a space shuttle and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, for example, a game machine, an electric automobile toy, an electric ship toy and an electric airplane toy, etc. The electric tool can be a metal cutting electric tool, a grinding electric tool, an assembling electric tool and a railway electric tool, etc. For example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator and an electric planer, etc. The type of the electric device is not specifically limited herein. In addition, the energy storage device can be an energy storage power station and an energy storage container, etc. The type of the energy storage device is not specifically limited herein.
[0044] As shown in Figures 1 to 5 The battery cell provided by the embodiment includes a shell, an electrode assembly and a cover plate assembly 100.
[0045] The shell has a communicating accommodating cavity and an opening. The electrode assembly is arranged in the accommodating cavity. The cover plate assembly 100 includes a cover plate 110, a post 120 and a terminal 130. The cover plate 110 is connected to the shell to cover the opening. The first connecting hole 111 is arranged through the cover plate 110. The terminal 130 is connected to the side of the cover plate 110 away from the electrode assembly and is insulated from the cover plate 110. The second connecting hole 131 is arranged through the terminal 130. The post 120 is arranged through the first connecting hole 111 and the second connecting hole 131 and is insulated from the cover plate 110. One end of the post 120 is electrically connected to the electrode assembly. The end of the post 120 away from the electrode assembly is electrically connected to the terminal 130. The axis of the post 120, the axis of the first connecting hole 111 and the axis of the second connecting hole 131 coincide. The axis of the second connecting hole 131 and the axis of the terminal 130 do not coincide.
[0046] Exemplarily, the post 120 can be a positive post. In this case, the terminal 130 is a positive terminal. Of course, the post 120 can also be a negative post. In this case, the terminal 130 is a negative terminal. The type of the post 120 and the terminal 130 is not specifically limited herein. The electrical connection between the terminal 130 and the post 120 can be welding, riveting, clamping, etc. The electrical connection is not specifically limited herein.
[0047] It should be noted that the second connecting hole 131 is provided through the terminal 130, which means that the first connecting hole 111 penetrates the terminal 130 along the thickness direction of the cover plate 110. The first connecting hole 111 is provided through the cover plate 110, which means that the first connecting hole 111 penetrates the cover plate 110 along the thickness direction of the cover plate 110.
[0048] It can be understood that the battery cell provided by the embodiment is characterized in that the pole 120 is arranged in the first connecting hole 111 of the cover plate 110 and the second connecting hole 131 of the terminal 130, respectively, the axis of the pole 120, the axis of the first connecting hole 111, and the axis of the second connecting hole 131 coincide, the axis of the second connecting hole 131 and the axis of the terminal 130 do not coincide, and the center of the pole 120 is arranged to deviate from the center of the terminal 130. In this way, the welding area of the terminal 130 and the tab can be increased without changing the size of the terminal 130, thereby improving the overcurrent capacity and heat dissipation capacity of the terminal 130, and further facilitating high-rate charging and discharging of the battery module.
[0049] As shown in Figure 2 and Figure 5 , for example, the distance between the axis of the second connecting hole 131 and the axis of the terminal 130 is L, which satisfies 3mm≤L≤8mm, that is, the distance between the center of the pole 120 and the center of the terminal 130 is 3mm-8mm. For example, L can be selected as any one of 3mm, 3.5mm, 4mm, 4.2mm, 4.3mm, 4.5mm, 4.8mm, 4.9mm, 5mm, 5.1mm, 5.2mm, 5.5mm, 5.7mm, 5.86mm, 5.9mm, 6mm, 6.3mm, 6.5mm, 6.6mm, 7mm, 7.3mm, 7.5mm, 7.7mm, 8mm or any value in the range formed by any two of them, which is not limited specifically herein.
[0050] It should be noted that the accommodating cavity is used to accommodate electrolyte and an electrode assembly, the electrode assembly includes at least one battery cell, the electrolyte is used to soak the electrode assembly, and the electrode assembly is electrically connected with the pole 120, so as to facilitate charging and discharging of the battery cell. The terminal 130 is insulated from the cover plate 110, which can reduce the risk of short circuit caused by conduction between the terminal 130 and the cover plate 110. The pole 120 is insulated from the cover plate 110, which can reduce the risk of short circuit caused by conduction between the pole 120 and the cover plate 110. The axis direction of the pole 120, the axis direction of the first connecting hole 111, and the axis direction of the second connecting hole 131 are all parallel to the thickness direction of the cover plate 110.
[0051] As shown in Figures 3 to 5As shown, in one embodiment, the cover plate assembly 100 further comprises a plastic piece 140 connected between the cover plate 110 and the terminal 130, the plastic piece 140 is provided with a third connecting hole 141 penetrating therethrough, the axis of the third connecting hole 141 coincides with the axis of the second connecting hole 131, the pole 120 is arranged in the third connecting hole 141, the side of the cover plate 110 close to the terminal 130 is provided with a first recess 112 in communication with the first connecting hole 111, the side of the plastic piece 140 close to the cover plate 110 is provided with a first anti-torsion part 142, the first anti-torsion part 142 is arranged at the first recess 112, and the first anti-torsion part 142 and the first recess 112 are both non-circular to limit the relative rotation of the plastic piece 140 and the cover plate 110.
[0052] It can be understood that, by arranging the non-circular first anti-torsion part 142 and the non-circular first recess 112, the relative rotation of the plastic piece 140 and the cover plate 110 can be limited by the cooperation of the two, thereby effectively limiting the relative rotation of the pole 120 and the terminal 130, and the stability of the electrical connection between the terminal 130 and the pole 120 is improved. At the same time, by connecting the plastic piece 140 between the terminal 130 and the cover plate 110, the insulation between the terminal 130 and the cover plate 110 is achieved, and the risk of short circuit is reduced.
[0053] As shown in Figure 6 and Figure 7 Further, the side of the cover plate 110 close to the terminal 130 is provided with a second recess 113, and the side of the plastic piece 140 close to the cover plate 110 is provided with a second anti-torsion part 143, the second anti-torsion part 143 and the first anti-torsion part 142 are arranged in an interval, and the second anti-torsion part 143 is arranged at the second recess 113.
[0054] Exemplarily, the shape of the second anti-torsion part 143 and the second recess 113 can be one of a circle, an ellipse, a rectangle, a triangle, a pentagon, a hexagon, or a combination of any two thereof, which is not specifically limited herein.
[0055] It can be understood that, based on the arrangement of the first anti-torsion part 142 and the first recess 112, the arrangement of the second anti-torsion part 143 and the second recess 113 is added, which further limits the relative rotation of the terminal 130 and the pole 120, and the stability of the electrical connection between the terminal 130 and the pole 120 is further improved.
[0056] As shown in Figure 5 and Figure 7 Still further, the thickness of the cover plate 110 is T1, the depth of the first recess 112 and / or the second recess 113 is H1, and 0.3≤H1 / T1≤0.5 is satisfied.
[0057] Exemplarily, H1 / T1 can be selected as any value in 0.3, 0.31, 0.32, 0.35, 0.36, 0.38, 0.4, 0.41, 0.44, 0.45, 0.47, 0.49, 0.5 or any range formed by any two of them, without specific limitation here.
[0058] It is to be noted that if H1 / T1 is too large, the cover plate 110 will be too thin at the first groove 112 and the second groove 113, which will adversely affect the structural strength and stability of the cover plate 110. If H1 / T1 is too small, the effect of limiting the relative rotation of the terminal 130 and the pole 120 will be poor.
[0059] It can be understood that by controlling H1 / T1 in the range of 0.3-0.5, that is, controlling the ratio of the depth of the first groove 112 and / or the second groove 113 to the thickness of the cover plate 110 in the range of 30%-50%, not only can effectively limit the relative rotation of the terminal 130 and the pole 120, and improve the stability of the electrical connection of the terminal 130 and the pole 120, but also reduce the adverse effects of opening the first groove 112 and the second groove 113 on the cover plate 110.
[0060] As shown in Figure 8 and Figure 9 , further, the second anti-torsion part 143 and the second groove 113 are both provided with a plurality of, the adjacent two second anti-torsion parts 143 are arranged at intervals, the adjacent two second grooves 113 are arranged at intervals, and each second anti-torsion part 143 is arranged at a second groove 113.
[0061] It can be understood that by providing a plurality of second anti-torsion parts 143 and a plurality of second grooves 113, the first anti-torsion part 142 and the first groove 112 can be more effectively cooperated to jointly limit the relative rotation of the terminal 130 and the pole 120, so as to improve the stability of the electrical connection of the terminal 130 and the pole 120.
[0062] As shown in Figure 5 , Figure 7 and Figure 8 , further, the plastic part 140 is provided with a third groove 144 away from the side of the cover plate 110, the terminal 130 is arranged at the third groove 144, and the third groove 144 and the terminal 130 are both non-circular to limit the relative rotation of the terminal 130 and the plastic part 140, thereby effectively limiting the relative rotation of the terminal 130 and the pole 120, and improving the stability of the electrical connection of the terminal 130 and the pole 120.
[0063] It should be noted that the above-mentioned non-circular shape can be one of an ellipse, a rectangle, a triangle, a pentagon, a hexagon, or a combination of any two of them, without specific limitation here.
[0064] As shown in Figure 5 and Figure 7 Further, the size of the plastic part 140 in the thickness direction of the cover plate 110 is T2, and the depth of the third groove 144 is H2, and 0.6≤H2 / T2≤0.8 is satisfied.
[0065] Exemplarily, H2 / T2 can be selected as any one of 0.6, 0.61, 0.62, 0.65, 0.68, 0.7, 0.72, 0.73, 0.75, 0.77, 0.79, 0.8 or any range formed by any two of them, which is not limited here.
[0066] It should be noted that if H2 / T2 is too large, the remaining thickness of the plastic part 140 at the third groove 144 will be too small, that is, the plastic part 140 is too thin at the third groove 144, which increases the risk of short circuit of the terminal 130 and the cover plate 110. If H2 / T2 is too small, the effect of limiting the relative rotation of the terminal 130 and the pole 120 will be poor.
[0067] It can be understood that by controlling H2 / T2 in the range of 0.6-0.8, that is, controlling the ratio of the depth of the third groove 144 to the size of the plastic part 140 in the thickness direction of the cover plate 110 in the range of 60%-80%, not only can effectively limit the relative rotation of the terminal 130 and the pole 120, but also reduce the influence of opening the third groove 144 on the insulation performance of the plastic part 140.
[0068] In a second aspect, the embodiments of the present application provide a battery module, comprising a plurality of battery cells and a plurality of splices, each of the splices being welded to the terminals 130 of two adjacent battery cells to realize electrical connection of the plurality of battery cells.
[0069] It can be understood that since the battery module provided by the embodiments has the battery cell in any one of the embodiments of the first aspect, it has all the beneficial effects of the battery cell, which will not be repeated here.
[0070] In a third aspect, the embodiments of the present application provide a battery comprising the battery module in any one of the embodiments of the second aspect. The battery is a power battery or an energy storage battery.
[0071] It can be understood that since the battery provided by the embodiments has the battery module in any one of the embodiments of the first aspect, it has all the beneficial effects of the battery module, which will not be repeated here.
[0072] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.
[0073] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and the person skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.
Claims
1. A battery cell, characterized by, The battery cell comprises: a shell having a receiving cavity and an opening in communication with each other; an electrode assembly arranged in the receiving cavity; a cover plate assembly comprising a cover plate, a pole and a terminal, the cover plate being connected to the shell to cover the opening, the cover plate being provided with a first connecting hole therethrough, the terminal being connected to a side of the cover plate away from the electrode assembly and being insulated from the cover plate, the terminal being provided with a second connecting hole therethrough, the pole being arranged in the first connecting hole and the second connecting hole respectively and being insulated from the cover plate, one end of the pole being electrically connected to the electrode assembly, the other end of the pole being electrically connected to the terminal, the axis of the pole, the axis of the first connecting hole and the axis of the second connecting hole being coincident, and the axis of the second connecting hole and the axis of the terminal being non-coincident.
2. The battery cell of claim 1, wherein, The cover plate assembly further comprises a plastic member connected between the cover plate and the terminal, the plastic member being provided with a third connecting hole therethrough, the axis of the third connecting hole and the axis of the second connecting hole being coincident, the pole being arranged in the third connecting hole, the side of the cover plate close to the terminal being provided with a first groove in communication with the first connecting hole, the side of the plastic member close to the cover plate being provided with a first anti-torsion part, the first anti-torsion part being arranged at the first groove, the first anti-torsion part and the first groove being non-circular to limit the relative rotation of the plastic member and the cover plate.
3. The battery cell of claim 2, wherein, The side of the cover plate close to the terminal is provided with a second groove, the side of the plastic member close to the cover plate is provided with a second anti-torsion part, the second anti-torsion part and the first anti-torsion part being arranged in an interval, and the second anti-torsion part being arranged at the second groove.
4. The battery cell of claim 3, wherein, The thickness of the cover plate is T1, the depth of the first groove and / or the second groove is H1, and 0.3≤H1 / T1≤0.5 is satisfied.
5. The battery cell of claim 3, wherein, The second anti-torsion part and the second groove are both provided with a plurality of parts, two adjacent second anti-torsion parts are arranged in an interval, two adjacent second grooves are arranged in an interval, and each second anti-torsion part is arranged at a second groove.
6. The battery cell of claim 2, wherein, The side of the plastic member away from the cover plate is provided with a third groove, the terminal is arranged in the third groove, and the third groove and the terminal are both non-circular to limit the relative rotation of the terminal and the plastic member.
7. The battery cell of claim 6, wherein, The size of the plastic member in the thickness direction of the cover plate is T2, the depth of the third groove is H2, and 0.6≤H2 / T2≤0.8 is satisfied.
8. The battery cell of claim 1, wherein, The distance between the axis of the second connecting hole and the axis of the terminal is L, and 3mm≤L≤8mm is satisfied.
9. A battery module, characterized by The battery cell comprises any one of claims 1 to 8.
10. A battery, characterized by The battery module comprises claim 9.