Cover plate assembly of secondary battery and battery cell

Abstract

The utility model discloses a cover plate assembly of a secondary battery and a battery cell, and the cover plate assembly comprises a cover plate which is provided with a pole mounting hole and is provided with a first side and a second side which are opposite to each other along a first direction; the lower insulating plate is positioned on the first side of the cover plate and is provided with a through hole; the pole penetrates through the through hole and the pole mounting hole; the electric adapter is arranged on one side, opposite to the cover plate, of the lower insulating plate and comprises a pole connecting part connected with the pole and a tab connecting part connected with the electrode assembly, the pole connecting part extends along a second direction perpendicular to the first direction, and the tab connecting part extends along the first direction and is connected with the pole connecting part; the pole connecting part is embedded into one side, opposite to the cover plate, of the pole in the first direction, and the part embedded into the pole connecting part at least comprises a limiting part in the second direction, so that one surface, close to the electrode assembly, of the tab connecting part is parallel to one surface, close to the tab connecting part, of the electrode assembly. According to the technical scheme, at least the electric adapter of the cover plate assembly can be prevented from twisting relative to the cover plate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, and more particularly, to a cover plate assembly of a secondary battery and a battery cell. BACKGROUND

[0002] Secondary batteries are widely used in electronic devices, such as mobile phones, notebook computers, electric vehicles, electric cars, electric planes, electric ships, electric toy cars, electric toy ships, electric toy planes, electric tools, and the like. Common secondary batteries currently include cadmium-nickel batteries, hydrogen-nickel batteries, lithium-ion batteries, and secondary alkaline zinc-manganese batteries. Among them, lithium-ion batteries have become the mainstream power battery for new energy vehicles due to their high specific energy, high specific power, long service life, and low cost.

[0003] The cover plate assembly of a secondary battery includes a lower insulating plate for electrically insulating the electrode assembly from the cover plate, and an electrical adapter for electrically connecting the pole post to the electrode assembly. If the electrical adapter is twisted or unstable in position relative to the cover plate, it will have various adverse effects on the performance of the battery, so it is particularly important to fix the position of the electrical adapter. CONTENT OF THE UTILITY MODEL

[0004] To solve the above problems, the present application provides a cover plate assembly of a secondary battery and a battery cell, which can at least prevent the electrical adapter of the cover plate assembly from being twisted relative to the cover plate.

[0005] The technical solution of the present application is as follows:

[0006] According to one aspect of the present application, a cover plate assembly of a secondary battery is provided, which includes: a cover plate provided with a pole post mounting hole and having a first side and a second side oppositely arranged along a first direction, the first direction being the thickness direction of the cover plate; a lower insulating plate located on the first side of the cover plate and having a through hole corresponding to the pole post mounting hole; a pole post passing through the through hole and the pole post mounting hole; and an electrical adapter arranged on the side of the lower insulating plate facing away from the cover plate, including a pole post connecting portion connected with the pole post and a tab connecting portion connected with the electrode assembly, the pole post connecting portion extending along a second direction perpendicular to the first direction, the tab connecting portion extending along the first direction, and the pole post connecting portion being connected with the tab connecting portion; wherein, in the first direction, the side of the pole post facing away from the cover plate is embedded in the pole post connecting portion, and in the second direction, the portion of the pole post embedded in the pole post connecting portion includes at least a limiting portion, so that the side of the tab connecting portion close to the electrode assembly is parallel to the side of the electrode assembly close to the tab connecting portion.

[0007] In some embodiments, the projection of the limiting portion in the first direction towards the cover plate includes at least one edge.

[0008] In some embodiments, the projection of the limiting portion onto the first direction of the cover plate comprises four edges, and the closed shape formed by the four edges or the extensions of the four edges is a rectangle.

[0009] In some embodiments, the pole post comprises a body portion, and the limiting portion is formed by protruding from the body portion or recessed into the body portion in the second direction.

[0010] In some embodiments, in the first direction, the side of the pole post facing the cover plate is embedded into the lower insulating plate, and in the second direction, the portion of the pole post embedded into the lower insulating plate at least comprises the limiting portion.

[0011] In some embodiments, the pole post further comprises a regular portion connected to the side of the pole post facing away from the cover plate, and the regular portion is embedded into the pole post connecting portion.

[0012] In some embodiments, the projection of the regular portion onto the first direction of the cover plate is a circle.

[0013] In some embodiments, the pole post mounting hole comprises a first pole post mounting hole and a second pole post mounting hole; the through hole comprises a first through hole corresponding to the first pole post mounting hole and a second through hole corresponding to the second pole post mounting hole; the pole post comprises a first pole post and a second pole post with opposite polarities, the first pole post passes through the first through hole and the first pole post mounting hole, and the second pole post passes through the second through hole and the second pole post mounting hole; and the electrical adapter comprises a first electrical adapter and a second electrical adapter, the first electrical adapter comprises a first pole post connecting portion connected to the first pole post and a first tab connecting portion connected to the electrode assembly, and the second electrical adapter comprises a second pole post connecting portion connected to the second pole post and a second tab connecting portion connected to the electrode assembly, the first pole post connecting portion and the second pole post connecting portion extend in the second direction, the first tab connecting portion and the second tab connecting portion extend in the first direction, the first pole post connecting portion is connected to the first tab connecting portion, and the second pole post connecting portion is connected to the second tab connecting portion, in the first direction, the side of the first pole post and the second pole post facing away from the cover plate is embedded into the first pole post connecting portion and the second pole post connecting portion respectively, and in the second direction, the portion of the first pole post embedded into the first pole post connecting portion at least comprises the first limiting portion, and the portion of the second pole post embedded into the second pole post connecting portion at least comprises the second limiting portion.

[0014] In some embodiments, the first pole post comprises a first body portion, and the second pole post comprises a second body portion, in the second direction, the first limiting portion is formed by protruding from the first body portion or recessed into the first body portion, and the second limiting portion is formed by recessed into the second body portion or protruding from the second body portion.

[0015] In some embodiments, the side of the pole connecting portion facing the lower insulation plate has a groove, and the side of the body portion facing away from the cover plate is embedded in the groove, wherein the groove has a shape matched with the body portion in a plane perpendicular to the first direction. And / or, in some embodiments, the length of the limiting portion in the second direction is 1 / 15 to 1 / 8 of the length of the pole in the second direction.

[0016] According to another aspect of the present application, an electric core is also provided, which comprises a shell having an opening, an electrode assembly arranged in the shell, and the above-mentioned cover plate assembly covering the opening of the shell, the cover plate assembly comprising a lower insulation plate located on the first side of the cover plate close to the electrode assembly.

[0017] The beneficial technical effects of the present application include:

[0018] The embodiments of the present application can fix the relative position of the cover plate and the pole connecting portion by configuring the part of the side of the pole facing away from the cover plate embedded in the pole connecting portion to include a recess serving as a limiting portion, avoid the pole connecting portion from being twisted, and make the side of the tab connecting portion close to the electrode assembly parallel to the corresponding surface of the electrode assembly close to the tab connecting portion. Thus, the following can be achieved: avoiding the non-parallel tab connecting portion from pushing the tab into the electrode assembly and causing short circuit; avoiding the tab connecting portion from being inserted into the tab under the action of uneven force; avoiding the tab connecting portion from being unstable in welding with the corresponding tab, leading to cracking and tearing of the tab, battery false welding, high temperature rise, and serious battery life attenuation; and avoiding the non-parallel tab connecting portion from easily piercing and damaging the diaphragm, causing short circuit. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0020] FIG. 1A is an exploded view of the cover plate assembly according to an embodiment of the present application.

[0021] FIG. 1B is a bottom plan view of the cover plate assembly according to an embodiment of the present application.

[0022] FIG. 1C is a front view of the cover plate assembly and the electrode assembly according to an embodiment of the present application.

[0023] FIG. 2A is a bottom plan view of the pole according to an embodiment of the present application.

[0024] FIG. 2Bis an isometric side view of a pole post according to one embodiment of the present application.

[0025] FIG. 2C is a front view of a pole post according to one embodiment of the present application.

[0026] FIG. 3A is a bottom plan view of a lower insulating plate according to one embodiment of the present application.

[0027] FIG. 3B is an isometric side view of a lower insulating plate according to one embodiment of the present application.

[0028] FIG. 4A is a bottom plan view of a second insulating plate portion according to one embodiment of the present application.

[0029] FIG. 4B is an isometric side view of a second insulating plate portion according to one embodiment of the present application.

[0030] FIG. 5A is an exploded view of a cover plate assembly according to another embodiment of the present application.

[0031] FIG. 5B is an isometric side view of a cover plate assembly according to another embodiment of the present application.

[0032] FIG. 6 shows an isometric side view of a pole post of opposite polarity of a cover plate assembly according to another embodiment.

[0033] FIG. 7A is an isometric side view of an electrical adapter of a cover plate assembly according to another embodiment of the present application.

[0034] FIG. 7B is an isometric side view of a pole post of a cover plate assembly according to another embodiment of the present application.

[0035] FIG. 8A is a bottom plan view of a lower insulating layer and a pole post of a cover plate assembly according to another embodiment of the present application.

[0036] FIG. 8B is an isometric side view of a lower insulating layer and a pole post of a cover plate assembly according to one embodiment of the present application.

[0037] FIG. 8C is a bottom plan view of a first and second insulating plate portion of a cover plate assembly according to another embodiment.

[0038] FIG. 9 is an isometric side view of a pole post of a cover plate assembly according to other embodiments of the present application. DETAILED DESCRIPTION

[0039] With reference to the drawings and embodiments described below, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art belong to the scope of protection of the present application.

[0040] The following disclosure provides many different embodiments, or examples, for implementing different characteristics of the provided subject matter. Specific examples of elements and arrangements are described below to simplify the present disclosure. These are, of course, merely examples and are not intended to be limiting of the present application. For example, the formation of a first part over or on a second part can include embodiments in which the first part and second part are formed in direct contact, and can also include embodiments in which additional parts are formed between the first and second parts such that the first and second parts are not in direct contact. Further, the present application can refer to reference numerals and / or letters in various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and / or configurations discussed.

[0041] In addition, the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0042] FIG. 1A is an exploded view of a cover plate assembly 100 according to an embodiment of the present application. FIG. 1B is a bottom plan view of a cover plate assembly according to an embodiment of the present application. FIG. 1C is a front view of a cover plate assembly and an electrode assembly 900 according to an embodiment of the present application. The direction X, the direction Y and the direction Z are perpendicular to each other. As shown in FIGS. 1A-1C The cover plate assembly 100 can include a cover plate 110 having a first side 110S1 and a second side 110S2 oppositely arranged along the direction Z (which can be referred to as a first direction). The direction Z is the thickness direction of the cover plate 110. The first side 110S1 is the side of the cover plate 110 facing the electrode assembly 900 (see FIG. 1C The cover plate 110 is provided with a pole mounting hole 112A (which can be referred to as a first pole mounting hole) and a pole mounting hole 112B (which can be referred to as a second pole mounting hole). The pole mounting holes 112A, 112B extend from the first side 110S1 to the second side 110S2 of the cover plate 110.

[0043] The cover plate 110 extends in the direction X. The pole mounting holes 112A, 112B can be oppositely arranged along the direction X. The cover plate 110 can further include an explosion-proof valve structure 114, which can be located between the pole mounting holes 112A, 112B. When the battery cell is in thermal runaway, the explosion-proof valve structure 114 can be oriented to release pressure, and heat and spewing materials can be discharged to the outside of the battery cell through the explosion-proof valve structure 114, reducing the internal pressure of the battery cell and avoiding explosion caused by high pressure inside the battery cell.

[0044] The cover plate assembly 100 further includes a lower insulating plate 150 located on the first side 110S1 of the cover plate and having through holes 151A (which can be referred to as first through holes) and through holes 151B (which can be referred to as second through holes) corresponding to the pole mounting holes 112A, 112B. The lower insulating plate 150 extends in the direction X, and the through holes 151A, 151B can be oppositely arranged along the direction X.

[0045] In this embodiment, the lower insulating plate 150 specifically includes a first insulating plate portion 152 and a second insulating plate portion 154 connected to the first insulating plate portion 152. The length of the first insulating plate portion 152 in the direction X can be greater than the length of the second insulating plate portion 154. The through holes 151A, 151B are respectively arranged in the first insulating plate portion 152 and the second insulating plate portion 154. The lower insulating plate 150 can further include a plurality of holes 156 corresponding to the explosion-proof valve structure 114 for providing an exhaust passage.

[0046] The cover plate assembly 100 further includes a pole 220A (which can be referred to as a first pole) and a pole 220B (which can be referred to as a second pole) having opposite polarities. In some embodiments, the pole 220A is a positive pole, and the pole 220B is a negative pole. Alternatively, the pole 220A can be a negative pole, and the pole 220B can be a positive pole.

[0047] The pole 220A passes through the through hole 151A and the pole mounting hole 112A, and the second pole 220B passes through the through hole 151B and the pole mounting hole 112B. In addition, the cover plate 110 can further be provided with upper insulating members 322A, 322B, and electrode terminals 224A, 224B. The poles 220A, 220B can further pass through the corresponding upper insulating members 322A, 322B and be connected to the corresponding electrode terminals 224A, 224B.

[0048] The lower insulating plate 150 includes a first side 150S1 opposite to a second side 150S2 in the direction X, the first side 150S1 faces away from the cover plate 110 and faces towards the electrode assembly 900, and the second side 150S2 faces towards the cover plate 110. The cover plate assembly 100 can further include an electrical adapter 250A and an electrical adapter 250B (may be referred to as a first electrical adapter and a second electrical adapter respectively), which are disposed on the first side 150S1 of the lower insulating plate 150. The electrical adapter 250A electrically connects the pole post 220A with the electrode assembly 900, for example, connects a corresponding tab (for example, a positive tab) of the electrode assembly 900. The electrical adapter 250B electrically connects the pole post 220B with the electrode assembly 900, for example, connects a corresponding tab (for example, a negative tab) of the electrode assembly 900.

[0049] Specifically, the electrical adapter 250A includes a pole post connecting portion 252A connected with the pole post 220A, and a tab connecting portion 254A connected with the electrode assembly 900 (for example, connected with the positive tab). The pole post connecting portion 252A extends along the direction X, the tab connecting portion 254A extends along the direction Z, and the pole post connecting portion 252A is connected with the tab connecting portion 254A. The electrical adapter 250B includes a pole post connecting portion 252B connected with the pole post 220B, and a tab connecting portion 254B connected with the electrode assembly 900 (for example, connected with the negative tab). The pole post connecting portion 252B extends along the direction X, the tab connecting portion 254B extends along the direction Z, and the pole post connecting portion 252B is connected with the tab connecting portion 254B.

[0050] Generally, during assembly of the electrical adapter 250A and the electrical adapter 250B with the pole post 14A, 14B, the electrical adapter 250A and the electrical adapter 250B tend to twist around the corresponding pole post 14A, 14B, such that the tab connection portion 254A, 254B of the electrical adapter 250A and the electrical adapter 250B can be twisted, causing the tab connection portion 254A, 254B to be non-parallel, and causing the face of the tab connection portion 254A close to the electrode assembly 900 to be non-parallel to the face 901 of the electrode assembly 900 close to the tab connection portion 254A, and / or the face of the tab connection portion 254B close to the electrode assembly 900 to be non-parallel to the face 902 of the electrode assembly 900 close to the tab connection portion 254B. Such non-parallelism can further cause: in later use of the battery cell, the non-parallel tab connection portion 254A, 254B can cause the tab to be inserted into the electrode assembly, causing short circuit; the tab connection portion 254A, 254B can be inserted into the tab under uneven force; the tab connection portion 254A, 254B can be unstable in welding with the corresponding tab, which can cause the tab to crack or tear in later use, resulting in poor welding of the battery, high temperature rise, and serious attenuation of the battery life; and in the process of manufacturing, the non-parallel tab connection portion 254A, 254B can easily pierce or damage the separator when the battery cell is matched with the cover plate, causing short circuit.

[0051] FIG. 2A is a bottom plan view of a pole post according to an embodiment of the present application. FIG. 2B is an isometric side view of a pole post according to an embodiment of the present application. FIG. 2C is a front view of a pole post according to an embodiment of the present application. As shown in FIGS. 2A-2C The pole post 220A includes a body portion 225 and a post portion 227 connected to the body portion 225. The post portion passes through the through hole 151A and the pole post mounting hole 112A. The body portion 225 is located between the lower insulating plate 150 and the electrical adapter 250A. In this embodiment, the body portion 225 includes a recessed portion 225R. The recessed portion 225R is recessed from the body portion 225 in a direction perpendicular to the direction Z. In some embodiments, the structure of the pole post 220B can be the same as that of the pole post 220A.

[0052] In some embodiments, the electrode post 220A is embedded in the electrode post connection portion 252A of the electrical adapter 250A on the side facing away from the cover plate 110, and the portion of the electrode post 220A embedded in the electrode post connection portion 252A includes at least a recess 225R. The electrode post connection portion 252A may have a shape that mates with the recess 225R in the XY plane. In this embodiment, the recess 225R serves as a limiting portion to fix the relative position of the electrode post 220A and the electrode post connection portion 252A, preventing the electrode post connection portion 252A from twisting, so that the side of the tab connection portion 254A near the electrode assembly is parallel to the side 901 of the electrode assembly near the tab connection portion. Similarly, the side of the pole post 220B facing away from the cover plate 110 can be embedded in the pole post connection portion 252B of the electrical adapter 250B, and the portion of the pole post 220B embedded in the pole post connection portion 252B includes at least a recess 225R to prevent the pole post connection portion 252B from twisting, such that the side of the tab connection portion 254B near the electrode assembly is parallel to the side of the electrode assembly near the tab connection portion 902.

[0053] In the embodiments of this application, the portion of the electrode posts 220A and 220B embedded in the electrode post connecting portions 252A and 252B on the side opposite to the cover plate 110 includes a recessed portion 225R serving as a limiting portion. This can fix the relative position of the cover plate 110 and the electrode post connecting portions 252A and 252B, preventing the electrode post connecting portions 252A and 252B from twisting. This also ensures that the side of the tab connecting portions 254A and 254B near the electrode assembly 900 is parallel to the corresponding surfaces 901 and 902 of the electrode assembly near the tab connecting portions 254A and 254B. This can: prevent the non-parallel tab connections 254A and 254B from pushing the tabs into the electrode assembly and causing a short circuit; prevent the tab connections 254A and 254B from being inserted into the tabs under uneven forces; prevent the tab connections 254A and 254B from being welded to the corresponding tabs unstably, leading to tab cracking, tearing, poor battery soldering, high temperature rise, and severe battery life degradation; and prevent the non-parallel tab connections 254A and 254B from easily puncturing or tearing the separator, causing a short circuit.

[0054] In some embodiments, see FIGS. 2A-2C As shown, the projection of the recessed portion 225R of the main body portion 225 of the pole post 220B in the Z direction is an arc edge. The arc-shaped recessed portion 225R has the advantage of being easy to process. The number of recessed portions 225R can be 2 to 4. FIG. 2A and FIG. 2BIf the number of the arc-shaped recesses is too small, the arc-shaped recesses can not be sufficient to prevent the electrical adapter from being twisted relative to the cover plate and ensure that the tab connecting portion is parallel to the corresponding surface of the electrode assembly. If the number of the arc-shaped recesses is too large, the processing difficulty can be too great. By setting the number of the arc-shaped recesses 225R to be 2 to 4, the processing difficulty can be ensured to be not great, and the electrical adapter can be prevented from being twisted relative to the cover plate and the tab connecting portion can be ensured to be parallel to the corresponding surface of the electrode assembly.

[0055] In some embodiments, the projection of the recess 225R of the pole 220A, 220B in the direction Z can include at least one edge. Compared with the arc-shaped recess, the edge-shaped recess can provide better anti-twist effect. In an embodiment, the number of the edge-shaped recess 225R can be 1, respectively. Since the edge-shaped recess can provide better anti-twist effect, one recess can be set, respectively, which can further reduce the processing difficulty.

[0056] In some embodiments, the length of the recess 225R of the pole 220A, 220B in the direction X is 1 / 15 to 1 / 8 of the length of the corresponding pole 220A, 220B in the direction X. The length of the pole refers to the maximum length of the pole 220A. In the embodiment in which the pole is circular, the length of the pole is the diameter. In some embodiments, the maximum length of the pole 220A, 220B is the maximum length of the body portion 225 thereof. If the above length ratio is too small, the length of the recess 225R can be too small, which can not effectively prevent the electrical adapter from being twisted relative to the cover plate. If the above length ratio is too large, the length of the recess 225R can be too large, which can cause great processing difficulty and high cost. The length ratio range of 1 / 15 to 1 / 8 can ensure that the electrical adapter can be prevented from being twisted relative to the cover plate, and the processing is easy and the cost is low.

[0057] In some embodiments, the length of the recess 225R of the pole 220A, 220B in the direction X is in the range of 1.8 mm to 3.0 mm. If the length of the recess 225R is less than 1.8 mm or greater than 3.0 mm, the processing difficulty can be caused. The length value range of 1.8 mm to 3.0 mm is easier to process the recess 225R, and also has good anti-twist effect. In some embodiments, the length of the cover plate 110 in the direction X is in the range of 100 mm to 350 mm.

[0058] FIG. 3A is a bottom plan view of the lower insulating plate 150 according to an embodiment of the present application. FIG. 3B is an isometric side view of the lower insulating plate 150 according to an embodiment of the present application. FIG. 3A and FIG. 3BThe first side 150S1 of the lower insulating plate 150 facing the electrode assembly 900 is shown in FIG. 1. The lower insulating plate 150 is shown in FIG. 2. FIG. 3A and FIG. 3B As shown in FIG. 2, in the direction Z, the side of the pole posts 220A, 220B facing the cover plate 110 can be embedded in the lower insulating plate 150, and in the X-Y plane, the portion of the pole posts 220A, 220B embedded in the lower insulating plate 150 includes at least the recesses 225R serving as the limiting portions. By configuring the portion of the pole posts 220A, 220B embedded in the lower insulating plate 150 to include the recesses 225R serving as the limiting portions, the relative position between the lower insulating plate and the electrical adapter can be further fixed, and the electrical adapter can be prevented from being twisted, so that the tab connecting portion of the electrical adapter and the corresponding face of the electrode assembly can be kept parallel.

[0059] More specifically, the lower insulating plate 150 includes the protruding portions 150P. Each protruding portion 150P protrudes in a direction perpendicular to the direction Z. The recesses 225R of the pole posts cooperate with the corresponding protruding portions 150P of the lower insulating plate 150. The first insulating plate portion 152 and the second insulating plate portion 154 can respectively include the protruding portions 150P. The protruding portions 150P of the first insulating plate portion 152 cooperate with the recesses 225R of the pole post 220A, and the protruding portions 150P of the second insulating plate portion 154 cooperate with the recesses 225R of the pole post 220B. Hereinafter, the embodiments of the present application will be mainly described with reference to the cooperation between the protruding portions 150P of the second insulating plate portion 154 and the recesses 225R of the pole post 220B.

[0060] FIG. 4A is a bottom plan view of the second insulating plate portion 154 according to an embodiment of the present application. FIG. 4B is an isometric side view of the second insulating plate portion 154 according to an embodiment of the present application. The second insulating plate portion 154 is shown in FIG. 4. FIG. 4A and FIG. 4B As shown in FIG. 4, in some embodiments, the second insulating plate portion 154 protrudes at the first side 150S1 to form the accommodating portion 158. At least part of the body portion 225 and the recesses 225R of the pole post 220B are located in the accommodating portion 158. The side of the body portion 225 and the recesses 225R facing the cover plate 110 is located in the accommodating portion 158. In the X-Y plane, the accommodating portion 158 has a shape cooperating with the body portion 225 and the recesses 225R. In this way, by providing the accommodating portion 158 cooperating with the body portion 225 and the recesses 225R, the second insulating plate portion 154 not only cooperates with the recesses 225R, but also further cooperates with the shape of the body portion 225, so that the anti-twist effect can be further strengthened.

[0061] In some other embodiments, the body portion 225 of the poles 220A and 220B may also have other suitable shapes. In some other embodiments, the shape of the body portion 225 may be polymorphic, such as triangular or hexagonal (e.g., FIG. 9 (as shown), or the shape of the body part 225 can be elliptical. These shapes of the body part 225 also have the advantages of being easy to process and having good anti-torsion effect.

[0062] Combination FIGS. 2A-2C to FIG. 4A and FIG. 4B As shown, pole posts 220A and 220B have corresponding electrical adapters 250 embedded in the Z direction to achieve electrical connection between the pole posts and the electrical adapters. In some embodiments, pole posts 220A and 220B may also include regular portions 229 connected to the body portion 225 (see...). FIG. 2C The regular portion 229 is connected to the side of the body portion 225 opposite to the columnar portion 227. The regular portion 229 refers to the irregular projection shape of the regular portion 229 onto the cover plate 110 along the Z direction relative to the body portion 225, where the projection of the regular portion 229 onto the cover plate 110 along the Z direction has a regular graphic shape (e.g., circular). In some embodiments, the regular portions 229 of the poles 220A and 220B are embedded in the corresponding electrical adapters 250A and 250B in the Z direction. Since the poles and electrical adapters at least partially overlap in the thickness direction, the space occupied by the poles and electrical adapters inside the cell can be reduced, thereby increasing the overall energy density of the cell. In some embodiments, the projection of the regular portion 229 onto the cover plate 110 in the Z direction is circular. The circular regular portion 229 is easier to process and facilitates embedding the regular portion 229 into the electrical adapter 250, improving assembly efficiency.

[0063] Combination FIG. 1A As shown, electrical adapters 250A and 250B may each include a groove 251A and a groove 251B on the side facing downwards from the insulating plate 150, respectively. The shapes of grooves 251A and 251B can match the shapes of the regular portions 229 of the poles 220A and 220B. In some embodiments, the projections of grooves 251A and 251B in the Z direction are circular. The regular portions 229 of the poles 220A and 220B can be located in the corresponding grooves 251A and 251B.

[0064] In addition, the first and second insulator plate portions 152, 154 of the lower insulator plate 150 each have a protrusion 159 in the direction Z. The protrusions 159 can extend along the surface edges of the first side 150S1 of the corresponding first and second insulator plate portions 152, 154 to form a closed ring shape. The closed ring shape formed by the protrusions 159 can cooperate with the shape of the surfaces of the electrical adapters 250A, 250B facing the lower insulator plate 150 (the surfaces on which the grooves 251A, 251B are formed) and be embedded in the electrical adapters 250A, 250B. In addition, the above-mentioned closed ring shape is open in the middle, and the pole posts 220A, 220B are embedded in the electrical adapters 250A, 250B, respectively, through the corresponding openings. The protrusions 159 of the lower insulator plate 150 are embedded in the electrical adapters 250A, 250B in a form-fitting manner, which can further fix the relative positions of the pole posts 220A, 220B, the lower insulator plate 150, and the electrical adapters 250A, 250B, and prevent the electrical adapters from being twisted relative to the lower insulator plate.

[0065] FIG. 5A is an exploded view of a cover plate assembly 200 according to another embodiment of the present application. FIG. 5B is an isometric side view of the cover plate assembly 200 according to another embodiment of the present application. FIG. 6 shows an isometric side view of the pole posts of opposite polarity of a cover plate assembly according to another embodiment. FIGS. 5A-6 Aspects of the cover plate assembly 200 of the illustrated embodiment can be the same as the cover plate assembly 100 described above with reference to FIGS. 1A-4B The differences between the cover plate assembly 200 and the cover plate assembly 100 described above will be mainly described below.

[0066] In conjunction with FIGS. 5A-6As shown, the body part 225 of the pole post 220A, 220B includes at least one edge in the projection of the body part 225 in the direction Z towards the cover plate 110. The side of the pole post 220A away from the cover plate 110 can be embedded in the pole post connecting part 252A of the electrical adapter 250A, and the part of the pole post 220A embedded in the pole post connecting part 252A includes at least one edge. In the present embodiment, the edge of the body part 225 can be used as a limiting part to fix the relative position of the pole post 220A and the pole post connecting part 252A, to avoid the pole post connecting part 252A from being twisted, so that the side of the tab connecting part 254A close to the electrode assembly is parallel to the side of the electrode assembly close to the tab connecting part. Similarly, the side of the pole post 220B away from the cover plate 110 can be embedded in the pole post connecting part 252B of the electrical adapter 250B, and the part of the pole post 220B embedded in the pole post connecting part 252B includes at least one edge of the body part 225, to avoid the pole post connecting part 252B from being twisted, so that the side of the tab connecting part 254B close to the electrode assembly is parallel to the side of the electrode assembly close to the tab connecting part.

[0067] The embodiments of the present application can fix the relative position of the cover plate 110 and the pole post connecting part 252A, 252B by configuring the part of the pole post 220A, 220B embedded in the pole post connecting part 252A, 252B to include an edge used as a limiting part, to avoid the pole post connecting part 252A, 252B from being twisted, so that the side of the tab connecting part 254A, 254B close to the electrode assembly is parallel to the side of the electrode assembly close to the tab connecting part 254A, 254B. Thus, the following problems can be avoided: the non-parallel tab connecting part 254A, 254B can cause the tab to be pushed into the electrode assembly and cause short circuit; the tab connecting part 254A, 254B can be inserted into the tab under the action of uneven force; the tab connecting part 254A, 254B and the corresponding tab can not be stably welded, causing the tab to crack or tear, the battery to be poorly welded, the temperature to be excessively high, and the battery life to be severely attenuated; the non-parallel tab connecting part 254A, 254B can easily pierce or damage the separator, causing short circuit.

[0068] In the present embodiment, the body part 225 of the pole post 220A, 220B includes at least one edge in the projection of the body part 225 in the direction Z towards the cover plate 110. The side of the pole post 220A away from the cover plate 110 can be embedded in the pole post connecting part 252A of the electrical adapter 250A, and the part of the pole post 220A embedded in the pole post connecting part 252A includes at least one edge. In the present embodiment, the edge of the body part 225 can be used as a limiting part to fix the relative position of the pole post 220A and the pole post connecting part 252A, to avoid the pole post connecting part 252A from being twisted, so that the side of the tab connecting part 254A close to the electrode assembly is parallel to the side of the electrode assembly close to the tab connecting part. Similarly, the side of the pole post 220B away from the cover plate 110 can be embedded in the pole post connecting part 252B of the electrical adapter 250B, and the part of the pole post 220B embedded in the pole post connecting part 252B includes at least one edge of the body part 225, to avoid the pole post connecting part 252B from being twisted, so that the side of the tab connecting part 254B close to the electrode assembly is parallel to the side of the electrode assembly close to the tab connecting part. FIG. 6 As shown, the body part 225 of the pole post 220A, 220B includes at least one edge in the projection of the body part 225 in the direction Z towards the cover plate 110. The side of the pole post 220A away from the cover plate 110 can be embedded in the pole post connecting part 252A of the electrical adapter 250A, and the part of the pole post 220A embedded in the pole post connecting part 252A includes at least one edge. In the present embodiment, the edge of the body part 225 can be used as a limiting part to fix the relative position of the pole post 220A and the pole post connecting part 252A, to avoid the pole post connecting part 252A from being twisted, so that the side of the tab connecting part 254A close to the electrode assembly is parallel to the side of the electrode assembly close to the tab connecting part. Similarly, the side of the pole post 220B away from the cover plate 110 can be embedded in the pole post connecting part 252B of the electrical adapter 250B, and the part of the pole post 220B embedded in the pole post connecting part 252B includes at least one edge of the body part 225, to avoid the pole post connecting part 252B from being twisted, so that the side of the tab connecting part 254B close to the electrode assembly is parallel to the side of the electrode assembly close to the tab connecting part.

[0069] In addition, for the pole post 220A, the body part 225 of the pole post 220A can further include a protruding part 255P. The protruding part 255P protrudes in a direction (e.g. direction X) perpendicular to the direction Z. In some embodiments, the portion of the pole post 220A embedded in the electrical adapter 250A on the side facing away from the cover plate 110 can also include the protruding part 255P. The pole post connecting part 252A can have a shape that cooperates with the body part 225 of the pole post 220A and the protruding part 255P thereof in the X-Y plane. In the present embodiment, the edges of the body part 225 of the pole post 220A and the protruding part 255P can both be used as limiting parts, thereby being able to more effectively prevent the electrical connector from being twisted.

[0070] For the pole post 220B, the body part 225 of the pole post 220B includes a recessed part 255R. In the present embodiment, the recessed part 255R is recessed by the body part 225 in the direction X. The pole post connecting part 252B can have a shape that cooperates with the body part 225 of the pole post 220B and the recessed part 255R thereof in the X-Y plane. In the present embodiment, the edges of the body part 225 of the pole post 220B and the recessed part 255R can both be used as limiting parts, thereby being able to more effectively prevent the electrical connector from being twisted.

[0071] In some embodiments, the projection of the protruding part 255P, the recessed part 255R in the direction Z can include at least one edge. In the present embodiment, the projection of the protruding part 255P, the recessed part 255R in the direction Z includes three edges, and the three edges are sequentially connected by a rounded corner. The edge-shaped structure of the protruding part 255P, the recessed part 255R including edges can have a better anti-twist effect and is not difficult to process.

[0072] In the present embodiment, since the protruding part 255P, the recessed part 255R including edges can provide a good anti-twist effect, the number of the protruding part 255P, the recessed part 255R can be configured as 1. Configuring the number of the protruding part 255P, the recessed part 255R as 1 has the advantages of easy processing and low cost.

[0073] In some embodiments, the length of the protrusion 255P or the recess 255R in the direction X is 1 / 15 to 1 / 8 of the length of the corresponding pole column 220A, 220B in the direction X. Here, the length of the pole column refers to the maximum length of the pole column. In embodiments where the pole column is circular, the length of the pole column is the diameter. In some embodiments, the maximum length of the pole column 220A, 220B is the maximum length of the body portion 225 thereof. If the above length ratio is too small, the length of the protrusion 255P or the recess 255R will be too small, which can not effectively prevent the electrical adapter from being twisted relative to the cover plate, and if the above length ratio is too large, the length of the protrusion 255P or the recess 255R will be too large, which will cause too much difficulty in processing and high cost. The length ratio range of 1 / 15 to 1 / 8 can ensure that the electrical adapter can be prevented from being twisted relative to the cover plate, while also being easy to process and low in cost.

[0074] In some embodiments, the length of the protrusion 255P or the recess 255R in the direction X is in the range of 1.8 mm to 3.0 mm. This length value range is easier to process the protrusion 255P or the recess 255R, and has good anti-twist effect. In some embodiments, the length of the cover plate 110 in the direction X is in the range of 100 mm to 350 mm.

[0075] The limiting portions of different forms can be configured according to the specific needs of the two electrical adapters 250A, 250B, for example, in the present embodiment, the portions of the pole columns 220A, 220B that are sunk into the pole column connecting portions 252A, 252B of the corresponding electrical adapters 250A, 250B include limiting portions of different shapes, which increases the design flexibility.

[0076] In some other embodiments, the portions of the pole columns 220A, 220B that are sunk into the corresponding pole column connecting portions 252A, 252B can include limiting portions of the same shape. In some other embodiments, the body portions 225 of the pole columns 220A, 220B can also have other applicable shapes, for example, the shape of the body portion 225 can be a multi-variant shape, such as a triangular shape, or a hexagonal shape (as shown in FIG. 9 The body portion 225 of the pole column can also be an oval shape, and these shapes of the body portion 225 also have the advantages of being easy to process and having good anti-twist effect.

[0077] FIG. 7A is an isometric side view of an electrical adapter 250A of a cover plate assembly 200 according to another embodiment of the present application. FIG. 7B is an isometric side view of a pole column 220A of a cover plate assembly 200 according to another embodiment of the present application. FIG. 7A and FIG. 7B take the electrical adapter 250A and the pole column 220A as examples, respectively. In combination with FIG. 7A and FIG. 7BAs shown, in some embodiments, the side of the pole 220A facing away from the cover plate is embedded in the pole connecting portion 252A of the electrical adapter 250A in the direction Z. Specifically, the regular portion 229 of the pole 220A can be embedded in the pole connecting portion 252A, and the body portion 225 and the side of the protruding portion 225P connected to the regular portion 229 can also be embedded in the pole connecting portion 252A. Since the body portion 225 and the regular portion 229 of the pole 220A at least partially coincide with the pole connecting portion 252A in the thickness direction, the space occupied by the pole and the electrical adapter inside the battery cell can be further reduced, thereby improving the overall energy density of the battery cell. In some embodiments, the projection of the regular portion 229 on the cover plate 110 in the direction Z is circular. The circular regular portion 229 is easier to process, and facilitates embedding the regular portion 229 into the electrical adapter 250, which can improve assembly efficiency.

[0078] In some embodiments, specifically, the pole connecting portion 252A of the electrical adapter 250A can include a recess 251A on the side facing the lower insulation plate 150. The side wall of the recess 251A can have a recessed portion 251R to cooperate with the shape of the body portion 225 and the protruding portion 225P of the pole 220A, so that the body portion 225 and the protruding portion 225P are embedded in the recess 251A on the side in the direction Z. By forming the recess 251A on the pole connecting portion 252A to embed the side of the pole 220A in the pole connecting portion 252A, such an implementation structure is easier to process, has low cost, and has good anti-twist effect.

[0079] The electrical adapter 250A can also include a through hole 253A below the recess 251A. The shape of the through hole 253A can cooperate with the shape of the regular portion 229, so that the regular portion 229 of the pole 220A can be embedded in the through hole 253A.

[0080] The above description with reference to FIG. 7A and FIG. 7B The cooperation mode of the electrical adapter 250A and the pole 220A is described, and it should be understood that the electrical adapter 250B and the pole 220B can have a similar cooperation mode.

[0081] FIG. 8A is a bottom plan view of a lower insulation layer and a pole of a cover plate assembly 200 according to another embodiment of the present application. FIG. 8B is an isometric side view of a lower insulation layer and a pole of a cover plate assembly 200 according to an embodiment of the present application. FIG. 8C shows a bottom plan view of a first insulation plate portion and a second insulation plate portion of a cover plate assembly according to another embodiment.

[0082] In combination with FIGS. 8A-8CAs shown, the pole 220A includes a protrusion 255P, and the corresponding first insulator plate portion 152 includes a mating recess 150R. The pole 220B includes a recess 225R, and the corresponding second insulator plate portion 154 includes a mating protrusion 150P. The protrusion 255P and the protrusion 150P are each protruding in a direction perpendicular to the direction Z (e.g., the direction X). The recess 150R and the recess 225R are each recessed in a direction perpendicular to the direction Z (e.g., the direction X).

[0083] The first insulator plate portion 152 can be protruded at the first side 150S1 to form a receiving portion 158A. The receiving portion 158A has the recess 150R. At least part of the body portion 225 and the protrusion 255P of the pole 220A is located in the receiving portion 158. The side of the body portion 225 and the protrusion 255P of the pole 220A facing the cover plate 110 is located in the receiving portion 158A. In the X-Y plane, the receiving portion 158A has a shape mating with the body portion 225 and the protrusion 255P. By providing the receiving portion mating with the body portion 225 and the protrusion 255P, the relative position of the pole 220A and the first insulator plate portion 152 can be fixed.

[0084] Similarly, the second insulator plate portion 154 can be protruded at the first side 150S1 to form a receiving portion 158B. The receiving portion 158B has the protrusion 150P. At least part of the body portion 225 and the recess 255R of the pole 220B (e.g., the side facing the cover plate 110) is located in the receiving portion 158B. In the X-Y plane, the receiving portion 158B has a shape mating with the body portion 225 and the recess 255R, and the second insulator plate portion 154 is matingly shaped with both the body portion 225 and the recess 255R to fix the relative position of the pole 220B and the second insulator plate portion 154.

[0085] In some embodiments, the first and second insulation plate portions 152, 154 have protrusions 159 in the direction Z, respectively. The protrusions 159 can extend along the surface edges of the first side 150S1 of the corresponding first and second insulation plate portions 152, 154 to form a closed ring shape. The closed ring shape formed by the protrusions 159 can fit the shape of the surfaces of the electrical adapters 250A, 250B facing the lower insulation plate 150 (the surfaces having the grooves 251A, 251B formed thereon), and be embedded in the electrical adapters 250A, 250B. In addition, the closed ring shape is open in the middle, and the pole posts 220A, 220B are embedded in the electrical adapters 250A, 250B, respectively, through the corresponding openings. The protrusions 159 of the lower insulation plate 150 are embedded in the electrical adapters 250A, 250B in a form-fitting manner, which can fix the relative positions of the pole posts 220A, 220B, the lower insulation plate 150, and the electrical adapters 250A, 250B, and further prevent the electrical adapters from being twisted relative to the lower insulation plate. In some embodiments, in the direction Z, the receiving portion 158A of the first lower insulation plate 152 is at least partially embedded in the electrical adapter 250A in a form-fitting manner, for example, embedded in the groove 251A. This ensures that the relative positions of the pole post 220A, the first insulation plate portion 152, and the electrical adapter 250A remain fixed.

[0086] In other embodiments, the first and second insulation plate portions 152, 154 are not embedded in the electrical adapters 250A, 250B, and the pole posts 220A, 220B are directly embedded in the electrical adapters 250A, 250B through the openings. Such a structure can reduce the difficulty of processing.

[0087] The above describes the configuration of the electrical adapter 250A with the pole post 220A and the first lower insulation plate 152. It should be understood that the electrical adapter 250B can have a similar configuration with the pole post 220B and the second lower insulation plate 154. FIG. 8A and FIG. 8C The above describes the configuration of the electrical adapter 250A with the pole post 220A and the first lower insulation plate 152. It should be understood that the electrical adapter 250B can have a similar configuration with the pole post 220B and the second lower insulation plate 154.

[0088] Embodiments of the present application also provide an electric cell, which can include a housing having an opening, an electrode assembly (such as the electrode assembly 900) disposed in the housing, and a cover plate assembly (such as the cover plate assembly 100 or 200 described above) covering the opening of the housing.

[0089] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A cover plate assembly of a secondary battery, characterized by comprising: The cover plate includes a pole mounting hole and has a first side and a second side disposed opposite each other in a first direction, which is a thickness direction of the cover plate. The lower insulating plate is located on the first side of the cover plate and has a through hole corresponding to the pole mounting hole. The pole passes through the through hole and the pole mounting hole. The electrical adapter is disposed on a side of the lower insulating plate facing away from the cover plate and includes a pole connecting portion connected to the pole and a tab connecting portion connected to an electrode assembly, the pole connecting portion extends in a second direction perpendicular to the first direction, and the tab connecting portion extends in the first direction, the pole connecting portion is connected to the tab connecting portion. In the first direction, a side of the pole facing away from the cover plate is embedded in the pole connecting portion. In the second direction, the portion of the pole embedded in the pole connecting portion includes at least a limiting portion, so that a side of the tab connecting portion close to the electrode assembly is parallel to a side of the electrode assembly close to the tab connecting portion.

2. The cover plate assembly of the secondary battery according to claim 1, wherein a projection of the limiting portion in the first direction of the cover plate includes at least one edge.

3. The cover plate assembly of the secondary battery according to claim 2, wherein a projection of the limiting portion in the first direction of the cover plate includes four edges, or an extension line of the four edges, and a closed shape formed by the four edges or the extension line is a rectangle.

4. The cover plate assembly of the secondary battery according to claim 1, wherein the pole includes a body portion, and the limiting portion is formed by protruding from the body portion or recessing from the body portion in the second direction.

5. The cover plate assembly of the secondary battery according to claim 1, wherein in the first direction, a side of the pole facing the cover plate is embedded in the lower insulating plate, in the second direction, the portion of the pole embedded in the lower insulating plate includes at least the limiting portion.

6. The cover plate assembly of the secondary battery according to claim 1, wherein the pole further includes a regular portion connected to the side of the pole facing away from the cover plate, and the regular portion is embedded in the pole connecting portion.

7. The cover plate assembly of the secondary battery according to claim 6, wherein a projection of the regular portion in the first direction of the cover plate is a circle.

8. The cover plate assembly of the secondary battery according to claim 1, wherein the pole mounting hole includes a first pole mounting hole and a second pole mounting hole; the through hole includes a first through hole corresponding to the first pole mounting hole and a second through hole corresponding to the second pole mounting hole; the pole includes a first pole and a second pole having opposite polarities, the first pole passes through the first through hole and the first pole mounting hole, and the second pole passes through the second through hole and the second pole mounting hole; and ​ ​ The electrical adapter includes a first electrical adapter and a second electrical adapter, the first electrical adapter includes a first pole post connecting portion connected with the first pole post and a first tab connecting portion connected with the electrode assembly, the second electrical adapter includes a second pole post connecting portion connected with the second pole post and a second tab connecting portion connected with the electrode assembly, the first pole post connecting portion and the second pole post connecting portion extend along the second direction, the first tab connecting portion and the second tab connecting portion extend along the first direction, the first pole post connecting portion is connected with the first tab connecting portion, the second pole post connecting portion is connected with the second tab connecting portion, In the first direction, the side of the first pole post and the second pole post away from the cover plate is respectively embedded in the first pole post connecting portion and the second pole post connecting portion, In the second direction, the part of the first pole post embedded in the first pole post connecting portion at least includes a first limiting portion, the part of the second pole post embedded in the second pole post connecting portion at least includes a second limiting portion.

9. The cover plate assembly of the secondary battery according to claim 8, wherein The first pole post includes a first body portion, and the second pole post includes a second body portion, In the second direction, the first limiting portion is formed by the first body portion protruding or the first body portion being recessed, and the second limiting portion is formed by the second body portion being recessed or the second body portion protruding.

10. The cover plate assembly of the secondary battery according to claim 4, wherein One side of the pole post connecting portion facing the lower insulating plate has a groove, and the side of the body portion away from the cover plate is embedded in the groove, wherein, in a plane perpendicular to the first direction, the groove has a shape matched with the body portion; and / or The length of the limiting portion in the second direction is 1 / 15 to 1 / 8 of the length of the pole post in the second direction.

11. An electric cell characterized by Comprise: A housing having an opening; An electrode assembly disposed in the housing; And The cover plate assembly of any one of claims 1-10, covering the opening of the housing, the cover plate assembly including a lower insulating plate, the lower insulating plate being located on the first side of the cover plate close to the electrode assembly.

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