CN218299976U - Cover plate of battery cell, battery and energy storage system - Google Patents

Abstract

The application provides apron, battery and energy storage system of electric core, the apron of this electric core includes first plastic body and one or two connection pieces, and this connection piece has two connecting portion and is located the fixed part between two connecting portion, and this fixed part can be connected with the utmost point post of utmost point core. The connecting piece is arranged on the surface of the first plastic body facing the pole cores, two connecting parts of the connecting piece are respectively contacted with one of the pole lugs of each group of the two groups of the pole cores, the two groups of the pole cores are positioned in the electric core, and each group of the pole cores comprises one or more pole cores. The first plastic body is provided with a first group of stop blocks in a protruding mode on the surface, facing the pole core, of the first plastic body, and the first group of stop blocks can limit the connecting piece to move on the surface, facing the pole core, of the first plastic body. This application can improve the production quality of battery through the structure of the apron that changes electric core.

Description

Cover plate of battery cell, battery and energy storage system

Technical Field

The application relates to the technical field of batteries, in particular to a cover plate of a battery cell, a battery and an energy storage system.

Background

Referring to fig. 1, fig. 1 is a schematic structural diagram of a cover plate of a conventional battery cell. As shown in fig. 1, the cover plate 10 includes a plastic body 100 and a connecting piece 101. The connecting sheet 101 is disposed on a surface of the plastic body 100 facing the pole core, and the connecting sheet 101 is used to establish an electrical connection with one of the tabs of each of the two sets of pole cores.

The production process of the conventional battery core has two assembly modes, one mode is that a connecting sheet 101 is positioned and placed on the surface of a plastic body 100 facing to a pole core through a clamp, the connecting sheet 101 and a cover plate 10 of the battery core are welded into a whole, and then the connecting sheet 101 and a pole lug in the pole core are connected together through laser welding; the other method is to weld the tab in the pole core and the connecting piece 101 together, and then position the connecting piece 101 with the pole core on the surface of the plastic body 100 facing the pole core by a clamp.

In any assembly method, during the process of positioning and placing the connecting piece 101 by the fixture, the connecting piece 101 is prone to be deviated, that is, the actual position where the connecting piece 101 is placed on the plastic body 100 is not a pre-designed position. Because the connecting sheet 101 is connected with the pole ear of the pole core, under the condition that the connecting sheet 101 is deviated, the pole ear of the pole core is pulled in the process of combining the two groups of pole cores, so that the pole ear in the pole core is also deviated; even the connecting tab 101 is biased into contact with the cell's housing. Since the case of the battery is an aluminum case, if the insulating film on the outer side of the aluminum case is broken, the connecting sheet 101 connects the electrode core and the case of the battery, causing a short circuit of the battery. Generally, the quality of the produced battery is not good enough by adopting the existing cover plate of the battery core and the pole core for assembly.

SUMMERY OF THE UTILITY MODEL

The application provides apron, battery and energy storage system of electric core, through the structure that changes the apron, can improve the production quality of battery.

In a first aspect, an embodiment of the present application provides a cover plate of a battery cell, where the cover plate includes a first plastic body and one or two connecting pieces, the connecting piece has two connecting portions and a fixing portion located between the two connecting portions, and the fixing portion can be fixedly connected with a terminal post of the battery cell. Wherein, the connection piece is located the surface of the orientation utmost point core of first plastic body on, two connecting portion of this connection piece respectively with two sets of utmost point cores in one of them utmost point ear contact of every group utmost point core, these two sets of utmost point cores are located the electric core, and every group utmost point core includes one or more utmost point cores. The first plastic body is provided with a first group of stop blocks in a protruding mode on the surface facing the pole core, and the first group of stop blocks can limit the connecting piece to move on the surface facing the pole core of the first plastic body. This application embodiment sets up the first group at the protruding position piece that ends of the surface of the orientation utmost point core of first plastic body, and this first group stops the removal that the position piece can restrict the connection piece, realizes the effective positioning to the connection piece, has improved the assembly precision of connection piece effectively to the production quality of battery has been improved.

With reference to the first aspect, in a first possible implementation manner, the first set of stop blocks includes a first sub-stop block, and the first sub-stop block can limit the movement of the connecting sheet in at least one of the first direction and the second direction. Wherein the first direction is perpendicular to the second direction.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner, the two connecting portions include a first connecting portion, and a first set of stop blocks is convexly disposed on a surface of the first plastic body facing the pole core, and is specifically implemented as: the first connecting portion and the first sub stop block are located on the same side of the fixing portion along the second direction, and the first sub stop block is located on one side of the first connecting portion along the first direction and arranged side by side with the first connecting portion.

With reference to the second possible implementation manner of the first aspect, in a third possible implementation manner, the first sub-stop block is in contact with the first connecting portion and the fixing portion.

With reference to the first possible implementation manner of the first aspect, in a fourth possible implementation manner, the first set of stop blocks further includes a second sub-stop block, and the second sub-stop block can limit the movement of the connecting piece in at least one of the third direction and the fourth direction. Wherein the third direction is opposite to the first direction, and the fourth direction is opposite to the second direction.

With reference to the fourth possible implementation manner of the first aspect, in a fifth possible implementation manner, the two connecting portions include a first connecting portion, and a first set of stop blocks is convexly disposed on a surface of the first plastic body facing the pole core, and is specifically implemented as: the first connecting portion is located on the same side of the fixing portion in the second direction, and the second sub-stop block is located on one side of the first connecting portion in the fourth direction and located on one side of the fixing portion in the third direction.

With reference to the fifth possible implementation manner of the first aspect, in a sixth possible implementation manner, the second sub-stop block is in contact with the first connecting portion and the fixing portion.

With reference to the first aspect or any one of the foregoing possible implementation manners of the first aspect, in a seventh possible implementation manner, the cover plate further includes a second plastic body, and the second plastic body may limit the shape of the tab in each group of the pole cores. The second plastic body is arranged between the connecting sheet and the tabs in each group of the pole cores. This application embodiment can carry out spacing second plastic body to utmost point ear through increasing in the apron of electric core, guarantees that utmost point ear can keep good shape at every utmost point core later stage core-closing in-process, avoids utmost point ear fold and the problem that electric core arouses the battery short circuit that appears utmost point ear inverted plug.

With reference to the seventh possible implementation manner of the first aspect, in an eighth possible implementation manner, one or more sub-stop blocks in the first group of stop blocks are provided with a clamping groove, and the second plastic body is provided with a buckle matched with the clamping groove. And the buckle of the second plastic body is clamped in the clamping grooves of the one or more sub stop blocks. The clamping groove is formed in the stopping block, the buckle is arranged in the second plastic body, the buckle of the second plastic body is clamped in the clamping groove in the stopping block, the position of the second plastic body can be limited, the assembly precision of the second plastic body is effectively improved, and the safety and the reliability of the battery are further ensured.

With reference to the first aspect or any one of the foregoing possible implementation manners of the first aspect, in a ninth possible implementation manner, a boss is disposed on a surface of the first plastic body facing the pole core. One side of the boss along the first direction is provided with one of the two connecting sheets, and one side of the boss along the third direction is provided with the other one of the two connecting sheets, wherein the first direction is opposite to the third direction.

In a second aspect, an embodiment of the present application provides a battery, where the battery includes two sets of pole cores and a cover plate that combines the cell described in the first aspect or any one of the possible implementation manners of the first aspect. The cover plate of the battery cell is covered on the tops of the two groups of pole cores.

In a third aspect, an embodiment of the present application provides an energy storage system, which includes a battery management module and the battery described in conjunction with the second aspect, where the battery management module may manage the state of the battery.

It should be understood that the implementations and advantages of the various aspects described above in this application are mutually referenced.

Drawings

Fig. 1 is a schematic structural diagram of a cover plate of a conventional battery cell;

fig. 2 is a schematic overall structure diagram of a battery provided in an embodiment of the present application;

fig. 3 is a schematic structural diagram of a cover plate of a battery cell according to an embodiment of the present application;

fig. 4 to fig. 22 are schematic structural diagrams of a cover plate of another battery cell provided in an embodiment of the present application;

fig. 23 is a schematic plan view of a battery provided in an embodiment of the present application and including a cover plate of a battery cell shown in fig. 18;

fig. 24 is an exploded view of a battery according to an embodiment of the present application;

FIG. 25 is a schematic view of the battery shown in FIG. 2, taken along line B-B and then exploded;

fig. 26 isbase:Sub>A cross-sectional view of the battery shown in fig. 2 taken along linebase:Sub>A-base:Sub>A;

fig. 27 isbase:Sub>A further cross-sectional view of the battery of fig. 2 taken along linebase:Sub>A-base:Sub>A;

fig. 28 is a block diagram of an energy storage system according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The following describes embodiments of the present application in further detail with reference to the accompanying drawings.

Referring to fig. 2, fig. 2 is a schematic view of an overall structure of a battery according to an embodiment of the present disclosure. As shown in fig. 2, the battery 2 provided in the embodiment of the present application includes a cover plate 21 of a battery cell and two sets of pole pieces 22. Wherein, the cover plate 21 of the battery cell is covered on the top of the two groups of pole cores 22. It should be noted that fig. 2 exemplifies that each of the two sets of pole pieces 22 includes one pole piece, and in other possible implementations, each set of pole pieces may include two or more pole pieces.

Each group of pole cores is located in the electric core, the electric core is placed in a battery frame (not shown in the figure), and the cover plate 21 and the battery frame enclose a containing cavity which can contain each group of pole cores. That is, the cover plate 21 is covered on the top of the pole core 22 to form a battery core, and the battery core is placed in the battery frame to form the battery.

The battery 2 may be embodied as a lithium battery, a lead-acid battery, a sodium battery, a magnesium battery, an aluminum battery, a potassium battery, a nickel-cadmium battery, a nickel-hydrogen battery, or a lithium polymer battery, etc. In other words, the electrode material of the battery is not limited in the embodiments of the present application.

It can be understood that the battery 2 provided in the embodiment of the present application can be applied in any scenario requiring battery energy storage and battery power supply. For example, the battery 2 may be specifically applied to an energy storage system of a photovoltaic power generation system or a wind power generation system, or may be specifically applied to an electric vehicle, or may also be specifically applied to consumer electronics (such as a smart phone, a smart watch, a smart band, a bluetooth headset, and the like).

The battery 2 provided in the embodiment of the present application is different from the battery in the related art in that the structure of the cover plate 21 of the battery cell included in the battery 2 is different from that of the cover plate of the battery cell included in the battery in the related art. In concrete the realization, this application embodiment is equipped with the stopper piece at the first plastic body epirelief of the apron 21 of electric core, and this stopper piece can restrict the removal of connection piece on the surface of the orientation utmost point core of first plastic body to can realize the location to the connection piece, avoid the connection piece off normal. The structure that this application embodiment passes through the apron 21 that changes the electricity core avoids the connection piece off normal to improve the production quality of battery.

The specific structure of the cover plate 21 of the cell will be described with reference to the drawings.

In some possible embodiments, referring to fig. 3, fig. 3 is a schematic structural diagram of a cover plate of a battery cell provided in an embodiment of the present application. As shown in fig. 3, the cover plate 21A of the battery cell of the embodiment of the present application includes a first plastic body 310 and a connecting piece.

It should be noted that, the cover plate 21A of the battery cell is one specific embodiment of the cover plate 21 of the battery cell shown in fig. 2, and then the cover plate 21A of the battery cell may be disposed on the top of the pole core 22 of the battery.

The connecting sheet is disposed on the surface of the first plastic body 310 facing the pole cores, and two connecting portions of the connecting sheet are respectively in contact with one of the tabs of each of the two sets of pole cores. In a specific implementation, the connecting piece has two connecting portions (e.g., a first connecting portion 3111 and a second connecting portion 3112). Assuming that each set of pole pieces includes one pole piece (e.g., a first pole piece), the first connection portion 3111 may be in contact with the positive tab of the first pole piece in one set of pole pieces, and the second connection portion 3112 may be in contact with the positive tab of the first pole piece in the other set of pole pieces; alternatively, the first connection portion 3111 may be in contact with the negative electrode tab of a first pole piece in one group of pole pieces, and the second connection portion 3112 may be in contact with the negative electrode tab of the first pole piece in the other group of pole pieces. For another example, each set of pole pieces includes two pole pieces (e.g., a first pole piece and a second pole piece), and then the same pole ears (e.g., positive pole ears) of the first pole piece and the second pole piece in one set of pole pieces are pressed together and then contact the first connection portion 3111, and the positive pole ears of the first pole piece and the second pole piece in the other set of pole pieces are pressed together and then contact the second connection portion 3112. In general, the tabs of the pole core, which are in contact with the first connection portion and the second connection portion in the same connection piece, are homopolar, i.e., both are positive tabs or both are negative tabs.

The positive tab of the pole piece is a metal conductor from which the positive electrode is drawn out, and the negative tab of the pole piece is a metal conductor from which the negative electrode is drawn out.

The connecting sheet further has a fixing portion 3113 located between the first connecting portion 3111 and the second connecting portion 3112, and the fixing portion 3113 may be fixedly connected with a pole of the battery cell. Optionally, the fixing portion 3113 may be fixedly connected to the electrode post of the battery cell by welding.

The connecting sheet may be made of at least one metal such as copper, iron, or aluminum, and has conductivity. The first plastic body 310 may be made of a material (e.g., plastic) having no electrical conductivity, and may be referred to as a plastic sheet.

A first set of stop blocks is protruded from the surface of the first plastic body 310 facing the pole core, and the first set of stop blocks can limit the movement of the connecting piece on the surface of the first plastic body 310 facing the pole core.

In some possible embodiments, the first set of stop blocks in the first plastic body 310 may specifically include a first sub-stop block. Wherein the first sub stop block may limit movement of the connecting piece in at least one of the first direction and the second direction.

It should be noted that, the directions of the surface of the first plastic body facing the pole core are divided by rectangular coordinates, where a negative half axis pointing to the x-axis is a first direction, a negative half axis pointing to the y-axis is a second direction, a positive half axis pointing to the x-axis is a third direction, and a positive half axis pointing to the y-axis is a fourth direction. Then there is a first direction perpendicular to the second direction, the first direction being opposite to the third direction, and the second direction being opposite to the fourth direction.

At this time, referring to fig. 3, the first plastic body 310 is provided with a protruding first sub-stopper at a position, as shown in fig. 3, the first connection portion 3111 and the first sub-stopper 3101 are located on the same side of the fixing portion 3113 along the second direction (i.e. along the negative direction of the y-axis), and the first sub-stopper 3101 is located on one side of the first connection portion 3111 along the first direction (i.e. along the negative direction of the x-axis) and is arranged side by side with the first connection portion 3111. That is, the first sub stopper 3101 is on the left side of the first connection portion 3111 and below the fixing portion 3113. The first sub stop block 3101 may limit the movement of the connecting tab in at least one of the first direction (i.e., the negative direction along the x-axis) and the second direction (i.e., the negative direction along the y-axis). In other words, the first sub stop block 3101 may limit movement of the connecting tab to at least one of the left and the down on the surface of the first plastic body 310 facing the pole piece.

Optionally, in some possible embodiments, the structure of the cover plate of the battery cell is embodied as the cover plate 21B of the battery cell shown in fig. 4, at this time, the first plastic body 410 is provided with the first sub-stop block in a protruding manner at the position as the position of the first sub-stop block 4101 shown in fig. 4, and the first sub-stop block 4101 is in contact with the first connection portion 3111 and the fixing portion 3113. With respect to the cover plate 21A of the battery cell shown in fig. 3, the first sub-stopper 4101 provided in the embodiment of the present application may limit the movement of the connecting tab in the first direction (i.e., the negative direction along the x-axis) and the second direction (i.e., the negative direction along the y-axis), that is, the first sub-stopper 4101 may limit the movement of the connecting tab in the left and the downward directions on the surface of the first plastic body 410 facing the pole core. To sum up, in the embodiment of the present application, the first sub-stop block is disposed in an included angle between the fixing portion and the first connecting portion, and the first sub-stop block contacts with the fixing portion and the first connecting portion, so that the movement of the connecting piece can be more effectively limited.

In the embodiment described above with reference to fig. 3 or 4, a sub-stop block is convexly disposed on the surface of the first plastic body facing the pole core, and the first group of stop blocks can limit the movement of the connecting piece, so as to effectively position the connecting piece, effectively improve the assembly precision of the connecting piece, and improve the production quality of the battery.

Optionally, in some possible embodiments, two sub-stop blocks may be protruded on a surface of the first plastic body facing the pole core.

For example, see a cover plate 21C of the cell shown in fig. 5. The first set of positioning blocks protruded from the first plastic body 510 includes a first sub-stopper 4101 and a second sub-stopper 5102.

It should be noted that fig. 5 illustrates the first sub-stopper 4101, and the first sub-stopper 3101 shown in fig. 3 may be combined with the second sub-stopper 5102 shown in fig. 5, that is, the second sub-stopper 5102 (not shown in the figure) may be added to the cover plate 21A shown in fig. 3.

In a particular implementation, the second sub-stopper 5102 can limit movement of the connecting tab in at least one of a third direction (i.e., a positive direction along the x-axis) and a fourth direction (i.e., a positive direction along the y-axis). In other words, the second sub-stopper 5102 can limit movement of the connecting piece at least one of rightward and upward on the surface of the first plastic body 310 facing the pole piece.

The position of the first sub-stop block 4101 can be referred to the description of fig. 4, and is not described herein.

The second sub stopper 5102 is located on one side of the first connection portion 3111 in the fourth direction (i.e., positive direction along the y-axis) and on one side of the fixing portion 3113 in the third direction (i.e., positive direction along the x-axis), wherein the first connection portion 3111 is located on one side of the fixing portion 3113 in the second direction (i.e., negative direction along the y-axis). That is, the second sub stopper 5102 is located at the upper side of the first connection portion 3111 and at the right side of the fixing portion 3113. The second sub stopper 5102 can limit movement of the connecting piece in at least one of a third direction (i.e., in the positive direction along the x-axis) and a fourth direction (i.e., in the positive direction along the y-axis). In other words, the second sub-stopper 5102 can limit movement of the connecting piece at least one of rightward and upward on the surface of the first plastic body 510 facing the pole piece.

Optionally, in some possible embodiments, the structure of the cover plate of the battery cell is specifically implemented as the cover plate 21D of the battery cell shown in fig. 6, at this time, the position of the first plastic body 610 where the second sub-stop block 6102 is protruded may be the same as the position of the second sub-stop block 6102 shown in fig. 6, and the second sub-stop block 6102 is in contact with the first connection portion 3111 and the fixing portion 3113. With respect to the cover plate 21C of the battery cell shown in fig. 5, the second sub-stop block 6102 provided in the embodiment of the present application may limit the movement of the connecting tab in the third direction (i.e., in the positive direction of the x axis) and the fourth direction (i.e., in the positive direction of the y axis), that is, the second sub-stop block 6102 may limit the movement of the connecting tab in the right direction and the upward direction on the surface of the first plastic body 610 facing the pole core. To sum up, this application embodiment can restrict the removal of connecting piece more effectively through ending the position piece with first son and setting up in a contained angle of fixed part and first connecting portion to end the position piece with the second son and set up in another contained angle of fixed part and first connecting portion, and end the position piece with the second son and all contact with fixed part and first connecting portion for first son, stop the position piece.

In the embodiment described above with reference to fig. 5 or 6, two sub-stop blocks are protruded on the surface of the first plastic body facing the pole core to limit the movement of the connecting piece, so as to effectively position the connecting piece.

Optionally, in some possible embodiments, three sub-stopper blocks may be protruded on a surface of the first plastic body facing the pole piece.

For example, see a cover plate 21E of the cell shown in fig. 7. The first set of positioning blocks protruding from the first plastic body 710 may further include a third sub-stop block 7103 in addition to the first sub-stop block 4101 and the second sub-stop block 6102.

It should be noted that fig. 7 is an example of the first sub-stop block 4101 and the second sub-stop block 6102, and the first sub-stop block 3101 shown in fig. 3 and the second sub-stop block 5102 shown in fig. 5 may be combined with the third sub-stop block 7103 shown in fig. 7 (not shown). For example, the first sub stop block 3101, the second sub stop block 6102, and the third sub stop block 7103 are combined (not shown). Alternatively, the first sub stop block 3101, the second sub stop block 5102, and the third sub stop block 7103 are combined (not shown in the figure). Alternatively, the first sub stopper 4101, the second sub stopper 5102, and the third sub stopper 7103 are combined, that is, the third sub stopper 7103 (not shown in the figure) is added to the cover plate 21C shown in fig. 5.

In particular implementations, the third sub-stop block 7103 may further limit the movement of the connecting tab in the second direction (i.e., the negative direction along the y-axis) as well as in the third direction (i.e., the positive direction along the x-axis). In other words, the third sub-stopper 7103 can limit the movement of the connecting tab to the right and downward on the surface of the first plastic body 710 facing the pole piece.

The first sub-stop block 4101 and the second sub-stop block 6102 refer to the embodiments described above with reference to fig. 6, which are not repeated herein.

The third sub stop block 7103 is located at one side of the second connection portion 3112 in the second direction (i.e., the negative direction along the y-axis) and at one side of the fixing portion 3113 in the third direction (i.e., the positive direction along the x-axis), wherein the second connection portion 3112 is located at one side of the fixing portion 3113 in the fourth direction (i.e., the positive direction along the y-axis). That is, the third sub stopper 7103 is positioned below the second connecting portion 3112 and to the right of the fixing portion 3113. The third sub-stop block 7103 can limit the movement of the connecting tab in the second direction (i.e., the negative direction along the y-axis) as well as in the fourth direction (i.e., the positive direction along the y-axis). In other words, the third sub-stopper 7103 can limit the movement of the connecting tab to the right and downward on the surface of the first plastic body 710 facing the pole piece.

The third sub stopper 7103 shown in fig. 7 is in contact with the second connection portion 3112 and the fixing portion 3113. In some possible embodiments, the third sub-stopper 7103 may not contact the second connection portion 3112 and the fixing portion 3113.

Relative in fig. 6 the surface of first plastic body towards utmost point core is protruding to be equipped with two sub stop blocks, and this application embodiment has add a third sub stop block on the surface of first plastic body towards utmost point core, and this third sub stop block can further fix a position the connection piece, avoids the connection piece uneven atress in the location of two sub stop blocks to lead to the off normal. The embodiment of the application provides three sub stop blocks, and the assembly precision of the connecting sheet can be further improved. And set up a third sub-stopper more, it is no influence to the manufacturing cost of the apron of electric core, consequently, this application embodiment can be on the basis of not increasing manufacturing cost, further improve the production quality of battery.

Optionally, in some possible embodiments, referring to fig. 8, fig. 8 is a schematic structural diagram of a cover plate of a battery cell provided in an embodiment of the present application. As shown in fig. 8, the cover plate 21F of the cell differs from the cover plate 21E of the cell shown in the foregoing fig. 7 in that the third sub-stopper block is disposed at a different position.

At this time, the cover plate 21F of the battery cell is provided with a protruding third sub-stop block at the position as the third sub-stop block 8103 shown in fig. 8. In a specific implementation, the third sub stop block 8103 can further limit the movement of the connecting piece in the first direction (i.e., the negative direction along the x-axis) and the fourth direction (i.e., the positive direction along the y-axis). In other words, the third sub-stopper 8103 can limit the movement of the connecting piece to the left and upward on the surface of the first plastic body 810 facing the pole piece.

The first sub-stop block 4101 and the second sub-stop block 6102 refer to the embodiments described above with reference to fig. 6, which are not repeated herein.

The third sub-stopper 8103 and the second connection portion 3112 are located on the same side of the fixing portion 3113 in the fourth direction (i.e., in the positive direction along the y-axis), and the third sub-stopper 8103 is located on one side of the second connection portion 3112 in the first direction (i.e., in the negative direction along the x-axis) and is arranged side by side with the second connection portion 3112. That is, the third sub stopper 8103 is positioned on the left side of the second connecting portion 3112 and on the upper side of the fixing portion 3113. The third sub stop block 8103 may limit the movement of the tab in the first direction (i.e., the negative direction along the x-axis) and in the fourth direction (i.e., the positive direction along the y-axis). In other words, the third sub-stopper 7103 can limit the movement of the connecting tab to the right and upward on the surface of the first plastic body 710 facing the pole piece.

Third sub stopper 8103 shown in fig. 8 is in contact with second connection portion 3112 and fixing portion 3113. In some possible embodiments, the third sub stopper 8103 may be in contact with any one of the second connection portion 3112 and the fixing portion 3113 or may not be in contact with the second connection portion 3112 and the fixing portion 3113.

In the embodiment of the application, the three sub stop blocks are arranged on the surface of the first plastic body facing the pole core in a protruding mode, and the third sub stop block is arranged at a position different from that in fig. 7, so that the effect similar to that of the embodiment described in fig. 7 can be achieved, the assembly precision of the connecting piece can be further improved, and the production quality of the battery can be further improved on the basis of not increasing the production cost.

In the embodiment described above with reference to fig. 7 or 8, three sub-stop blocks are protruded on the surface of the first plastic body facing the pole core to limit the movement of the connecting piece, so as to effectively position the connecting piece.

Optionally, in some possible embodiments, four sub-stop blocks may be protruded on a surface of the first plastic body facing the pole core. At this time, see the cover plate 21G of the cell shown in fig. 9. The first set of positioning blocks protruded from the first plastic body 910 includes a third sub-stop block 8103 shown in fig. 8 in addition to the first sub-stop block 4101, the second sub-stop block 6102, and the third sub-stop block 7103 shown in fig. 7. It should be explained that, at this time, the third sub-stop block 7103 is a different sub-stop block than the third sub-stop block 8103.

The first sub-stop block 4101, the second sub-stop block 6102, and the third sub-stop block 7103 may refer to the embodiment described above with reference to fig. 7, and the third sub-stop block 8103 may refer to the embodiment described above with reference to fig. 8, which is not repeated herein.

This application embodiment sets up four sub-stopper blocks in the surface protruding towards utmost point core of first plastic body, fixes a position the connection piece, can further improve the assembly precision of connection piece to further improve the production quality of battery.

Optionally, in some possible implementations, referring to fig. 10, fig. 10 is a schematic structural diagram of a cover plate of a battery cell according to an embodiment of the present application. As shown in fig. 7, the cover plate 21H of the battery cell may further include a second plastic body 1012 in addition to the first plastic body 1010 and the connecting piece.

It should be explained that the cover plate 21H of the battery cell shown in fig. 10 may be formed by adding a second plastic body 1012 to the cover plate 21B of the battery cell shown in fig. 4, or may be formed by adding a second plastic body 1012 to the cover plate 21C of the battery cell shown in fig. 5, or may be formed by adding a second plastic body 1012 to the cover plate 21D of the battery cell shown in fig. 6, or may be formed by adding a second plastic body 1012 to the cover plate 21E of the battery cell shown in fig. 7. That is, the first plastic body 1010 in the embodiment of the present application may be implemented as the first plastic body 410 shown in fig. 4, the first plastic body 510 shown in fig. 5, the first plastic body 610 shown in fig. 6, or the first plastic body 710 shown in fig. 7.

At this time, the second plastic body 1012 is disposed between the connecting piece and the tab of each group of pole cores, that is, the second plastic body 1012 is disposed on a side of the connecting piece away from the first plastic body 1010.

The second plastic body 1012 can also be made of a material without conductivity (such as plastic, etc.), so the first plastic body 1010 can also be called an upper plastic sheet, and the second plastic body 1012 can also be called a lower plastic sheet.

The second plastic body 1012 can limit the shape of the first tab. It can be understood that the tab of the pole core is connected with the connecting piece, the connecting piece is arranged on the top of the pole core, and the connecting relationship is established from bottom to top when the tab is connected with the connecting piece. Second plastic body 1012 can carry on spacingly to utmost point ear of utmost point core this moment between utmost point core and connection piece, guarantees that utmost point ear can keep good shape at the in-process that every utmost point core later stage closed the core, avoids utmost point ear fold and the problem that utmost point ear inverted plug electricity core arouses the battery short circuit.

Generally speaking, the embodiment of the application can further improve the production quality of the battery by adding the second plastic body capable of limiting the polar ear in the cover plate of the battery cell.

Optionally, in some possible embodiments, a second plastic body (not shown in the drawings) for limiting the tabs may be further added to the cover plate 21A of the battery cell shown in fig. 3 or the cover plate 21F of the battery cell shown in fig. 8, or a second plastic body (not shown in the drawings) for limiting the tabs may be further added to the cover plate 21G of the battery cell shown in fig. 9. That is, the first plastic body may be embodied as the first plastic body 310 shown in fig. 3 or the first plastic body 810 shown in fig. 8 or the first plastic body 910 shown in fig. 9.

Optionally, in some possible embodiments, please refer to fig. 11 and 12 together, and it can be known from fig. 11 and 12 that the cover plate 21I of the battery cell includes a first plastic body 1110, a connecting piece, and a second plastic body 1212.

In order to more intuitively see the difference between the first plastic body 1010 of the cover plate 21I of the battery cell and the first plastic body 710 described in fig. 7, fig. 11 is a drawing in which the second plastic body 1212 is omitted. At this time, as can be seen from fig. 11, the first plastic body 1010 is provided with a slot corresponding to the first plastic body 710 shown in fig. 7, and the second sub-stop block 11102 and the third sub-stop block 11103.

As shown in fig. 12, the second plastic body 1212 is opposite to the second plastic body 1012 shown in fig. 10, and a fastening buckle matching with the fastening groove is arranged on a body portion of the second plastic body 1212. It should be explained that, the snap fit with the card slot herein means that when the second plastic body 1212 is placed on the cover plate 21I of the electrical core, the position of the snap fit and the position of the card slot may correspond to each other, and the size of the snap fit and the size of the card slot may also correspond to each other. At this time, the buckle of the second plastic body 1212 is respectively clamped in the slot of the second sub-stop block 11102 and the slot of the third sub-stop block 11103.

The clamping groove is formed in the stopping block, the buckle is arranged in the second plastic body, and the buckle of the second plastic body is clamped in the clamping groove in the stopping block, so that the position of the second plastic body can be limited. By implementing the embodiment of the application, the assembly precision of the second plastic body can be effectively improved, and the safety and reliability of the battery are further ensured.

It should be noted that fig. 11 and 12 are diagrams illustrating a structure of a cover plate of a battery cell shown in fig. 7, where a second sub-stopper block and a third sub-stopper block of the three sub-stopper blocks are provided with a clamping groove, two buckles are arranged in the second plastic body, and the two buckles in the second plastic body are respectively clamped to the second sub-stopper block and the third sub-stopper block.

In some possible embodiments, in the cover plates of the battery cells with different structures described above in conjunction with fig. 3 to 9, the first set of stop blocks includes one sub-stop block, two sub-stop blocks, three sub-stop blocks, or four sub-stop blocks, and each sub-stop block may have a different position arrangement, so that the first set of stop blocks may have a plurality of different slotting manners. For example, all three sub-stop blocks shown in fig. 7 may be slotted (not shown), or one sub-stop block in one sub-stop block shown in fig. 3 may be slotted (not shown), and so on. In general, the beneficial effects of the embodiments described above with reference to fig. 11 and 12 can be achieved by only slotting in any one or more sub-stop blocks of the first set of stop blocks. Accordingly, the foregoing fig. 11 and 12 are to be considered as examples and not limiting.

It is to be understood that, in the embodiments described above with reference to fig. 3 to 12, the cover plate of the battery cell includes one connecting piece, and the cover plate of the battery cell provided in the embodiments of the present application may further include two connecting pieces. Because each pole core is provided with a positive pole and a negative pole, the positive pole and the negative pole of the pole core are led out by pole lugs to be connected with the connecting sheets. In the embodiments described above in connection with fig. 3 to 12, one connecting piece connects the same pole tab of different pole cores, i.e. either both the positive pole tab or both the negative pole tabs.

While each core has two tabs, in some possible embodiments, in particular production practices, the cell includes two cover plates of the cell as described above in connection with fig. 3-12. Illustratively, as shown in fig. 13, two cover plates 21A are included in the cells, wherein the connection piece in the cover plate 21A of one cell is connected with the positive tab, and the connection piece in the cover plate 21A of the other cell is connected with the negative tab. At this time, the cover plates 21A of the two cells are arranged side by side. Similarly, the top of the pole piece may also be provided with two first plastic bodies side by side as described in fig. 4 to 12, and at this time, the top of the pole piece includes two first plastic bodies, that is, the top of the pole piece is provided with a split type plastic body.

Optionally, in some possible embodiments, the cover plate of the battery cell may further include two connecting pieces, and the two connecting pieces are disposed on a surface of the first plastic body facing the pole core, where the first plastic body may be specifically implemented as an integrated plastic body, that is, a plastic body is disposed on the top of the pole core. The specific structure is shown in fig. 14 to 23.

Referring to fig. 14 first, fig. 14 is a schematic structural diagram of a cover plate of another battery cell provided in an embodiment of the present application. As shown in fig. 14, the cover plate 21J of the battery cell includes a first plastic body 1410 and two connecting pieces. The surface of the first plastic body 1410 of the cover plate 21J of the battery cell, which faces the pole core, is provided with a boss 1413, one side of the boss 1413 in the first direction (i.e., in the negative direction of the x axis) is provided with one of the two connecting pieces, and one side of the boss 1413 in the third direction (i.e., in the positive direction of the x axis) is provided with the other one of the two connecting pieces.

It can obtain to be distinguished from split type plastic body and need mould plastics more than twice at least, and first plastic body 1410 is the integral type plastic body, and the integral type plastic body can once be moulded plastics and obtain.

In a specific implementation, the first plastic body 1410 is provided with a first sub-stop block 3101 protruding from one side of the boss 1413 along the negative direction of the x-axis, and at this time, the position of the first sub-stop block 3101 can refer to the embodiment described above with reference to fig. 3, and the first sub-stop block can limit the movement of one of the two connecting pieces in at least one of the first direction (i.e., the negative direction along the x-axis) and the second direction (i.e., the negative direction along the y-axis).

The first plastic body 1410 is provided with another first sub-stop block 14101 on one side of the convex stage 1413 along the positive direction of the x-axis. As can be seen in fig. 14, the first plastic body 1410 can be symmetrical about the boss 1413. Then, the two sub-stop blocks (i.e. the first sub-stop block 3101 and the first sub-stop block 14101) protruded from the first plastic body 1410 can also be symmetrical with respect to the boss 1413.

At this time, the first sub stopper 14101 may restrict movement of the other of the two connection pieces in at least one of the second direction (i.e., a negative direction along the y-axis) and the third direction (i.e., a positive direction along the x-axis). In other words, the first sub stop block 14101 can limit movement of the other of the two connection pieces at least one of rightward and upward of the surface of the first plastic body 1410 facing the pole piece.

According to the embodiment of the application, the first plastic body is obtained through one-time injection molding, the surface of the first plastic body, which faces the pole core, is convexly provided with the two sub stop blocks, and each sub stop block limits the movement of one connecting piece respectively, so that two connecting pieces can be placed on one first plastic body. Compared with the embodiment described in the foregoing with reference to fig. 3 to 13, the embodiment of the present application only needs one-time injection molding to obtain the first plastic body for effectively positioning the two connecting sheets, so that the assembling processes can be reduced, and the production efficiency of the battery can be improved.

It can be understood that fig. 14 is a first plastic body 1410 obtained by integrally injection-molding two cell cover plates shown in fig. 3 symmetrically arranged about a boss 1413.

Similarly, in some possible embodiments, as shown in fig. 15, two cell covers shown in fig. 4 are symmetrically disposed about the boss 1513, and then are integrally molded, so as to obtain the first plastic body 1510.

Alternatively, in some possible embodiments, two cell covers shown in fig. 5 are symmetrically disposed about the boss, and then are integrally molded, so that a structure of the first plastic body (not shown) can also be obtained.

Alternatively, in some possible embodiments, as shown in fig. 16, two cell covers shown in fig. 6 are symmetrically disposed about the boss 1613, and then are integrally injection-molded, so as to obtain the first plastic body 1610.

Optionally, in some possible embodiments, the cover plates of the battery cells shown in fig. 3 to 13 may be rotated and matched to obtain different first plastic bodies. For example, as shown in fig. 17, the first plastic body 1710 is provided with two sub-stop blocks shown in fig. 6 protruding on one side of the boss 1713 in the first direction (i.e., the negative direction along the x-axis), and a boss sub-stop block 17104 and a sub-stop block 17105 protruding on one side of the boss 1713 in the third direction (i.e., the positive direction along the x-axis). It can be seen that the sub-stop blocks 17104 and 17105 are respectively obtained by rotating the boss 1713 by 90 ° counterclockwise after the two sub-stop blocks on one side of the boss 1713 in the negative direction of the x-axis are symmetrical with respect to the boss 1713.

At this time, the two sub-stop blocks on one side of the boss 1713 along the negative direction of the x-axis limit the movement of one of the two connecting pieces, and the specific implementation may refer to the embodiment described in fig. 6, which is not described herein again.

The sub stop 17104 and the sub stop 17105 limit the movement of the other of the two links. In a particular implementation, the sub stop 17104 limits movement of the other of the two links in a first direction (i.e., a negative direction along the x-axis) and a second direction (i.e., a negative direction along the y-axis), and the sub stop 17105 limits movement of the other of the two links in a third direction (i.e., a positive direction along the x-axis) and a fourth direction (i.e., a positive direction along the y-axis).

As can be seen from fig. 17, the sub stop blocks disposed on the two sides of the boss of the first plastic body may be symmetrical or asymmetrical, and in the case that the sub stop blocks disposed on the two sides of the boss are asymmetrical, the sub stop blocks may be arranged in a manner matching the deformation of each sub stop block shown in fig. 3 to 12, for example, the sub stop blocks may rotate 90 °, 180 °, or 270 ° counterclockwise or clockwise.

It can be seen that the sub-stop blocks of the first plastic body 1610 in fig. 16 are all located on the same side of the cover plate 21L of the battery cell, while the sub-stop blocks of the first plastic body 1710 in fig. 17 may be located on different sides of the cover plate 21M of the battery cell. The embodiment depicted in fig. 17 can still achieve the effect depicted in fig. 16, that is, the first plastic body 1710 also needs only one injection molding, so that the assembly process can be reduced, and the production efficiency of the battery can be improved.

Alternatively, in some possible embodiments, as shown in fig. 18, two cell cover plates shown in fig. 7 are symmetrically disposed about the boss 1813, and then integrally injection-molded, so as to obtain the first plastic body 1810.

Alternatively, in some possible embodiments, the number of the sub stop blocks arranged on the first plastic body on the two sides of the boss may be different.

Illustratively, as shown in fig. 19, the first plastic body 1910 is provided with three sub-stop blocks as shown in fig. 7 protruding from one side of the boss 1913 along the first direction (i.e., along the negative direction of the x-axis), and is provided with two sub-stop blocks at one side of the boss 1713 along the third direction (i.e., along the positive direction of the x-axis), where the two sub-stop blocks can be two sub-stop blocks as shown in fig. 16 protruding from one side of the boss along the positive direction of the x-axis.

Alternatively, in some possible embodiments, the first plastic body is provided with a combination of three sub-stopper blocks protruding from one side of the boss along the negative direction of the x-axis and two sub-stopper blocks protruding from one side of the boss along the positive direction of the x-axis, and the positions of the three sub-stopper blocks provided by the first plastic body can be implemented as the positions of the three sub-stopper blocks shown in fig. 8 (not shown in the figure) in addition to the positions of the three sub-stopper blocks shown in fig. 7.

Optionally, in some possible embodiments, the first plastic body may be provided with four sub-stop blocks at one side of the boss along the negative direction of the x-axis, and two sub-stop blocks at one side of the boss along the positive direction of the x-axis. Or, the first plastic body can be convexly provided with four sub stop blocks at one side of the boss along the negative direction of the x axis, and three sub stop blocks at one side of the boss along the positive direction of the x axis. The specific implementation manner may be a permutation and combination between the sub-stop blocks shown in fig. 3 to fig. 12, which is not described herein again.

Optionally, in some possible embodiments, referring to fig. 20, fig. 20 is a schematic structural diagram of a cover plate of a battery cell provided in an embodiment of the present application. As shown in fig. 20, the cover plate 21P of the battery cell includes a second plastic body in addition to the first plastic body 2010 and the two connecting pieces. The second plastic body includes a second plastic body 2012A and a second plastic body 2012B.

It should be explained that the cover plate 21P of the battery cell shown in fig. 21 may be formed by adding a second plastic body 2012A and a second plastic body 2012B to the cover plate of any one of the battery cells shown in fig. 15 to 19. That is, the first plastic body 2010 in the embodiment of the present application may be implemented as any one of the first plastic bodies shown in fig. 15 to 19.

At this time, the second plastic body 2012A is disposed between one of the two connecting pieces and the pole core, and the second plastic body 2012B is disposed between the other of the two connecting pieces and the pole core.

The second plastic body 2012A and the second plastic body 2012B can be made of a material (e.g., plastic, etc.) having no electrical conductivity.

The second plastic body 2012A may limit the shape of one tab in each pole core, and the second plastic body 2012B may limit the shape of another tab in each pole core.

This application embodiment can guarantee that two utmost point ears of every utmost point core keep good shape at two sets of utmost point core later stages in-process that close the core, avoid utmost point ear fold to and avoid appearing arbitrary utmost point ear and insert electric core upside down and arouse the problem of battery short circuit.

Generally speaking, this application embodiment can carry out spacing second plastic body to two utmost point ears through increase in the apron of electric core, can further improve the production quality of battery.

Optionally, in some possible embodiments, please refer to fig. 21 and fig. 22 together, and it can be known from fig. 21 and fig. 22 that the cover plate 21Q of the battery cell includes a first plastic body 2110, two connecting pieces, a second plastic body 2112A, and a second plastic body 2112B.

In order to more intuitively recognize the specific structure of the first plastic body 2110 in the cover plate 21Q of the battery cell, fig. 21 is a drawing in which the second plastic body 2112A and the second plastic body 2112B are omitted. At this time, as can be seen from fig. 21, the first plastic body 2110 is provided with a slot on the sub-stopper block, compared to the first plastic body 1810 shown in fig. 18.

As shown in fig. 22, the second plastic body 2112A is provided with a buckle at a body portion of the second plastic body 2112A, opposite to the second plastic body 2012A shown in fig. 20; the second plastic body 2112B is opposite to the second plastic body 2012B shown in fig. 20, and a buckle is provided at a body portion of the second plastic body 2112B. It should be explained that, when the second plastic body 2112A is disposed on the cover plate 21Q of the electrical core, the position of the buckle of the second plastic body 2112A may correspond to the position of the slot and the size of the slot formed on the sub-stop block on the side of the boss 2113 along the first direction (i.e., along the negative direction of the x-axis) in fig. 21, and at this time, the buckle of the second plastic body 2112A is respectively clamped in the slot of the corresponding sub-stop block. Similarly, when the second plastic body 2112B is disposed on the cover plate 21Q of the electric core, the position of the buckle of the second plastic body 2112B may correspond to the position and size of the slot provided on the sub-stopper on the side of the boss 2113 along the third direction (i.e., along the positive direction of the x-axis) in fig. 21, and at this time, the buckle of the second plastic body 2112B is respectively clamped in the slot of the corresponding sub-stopper.

The clamping groove is formed in the stop block, the buckle is correspondingly arranged in the second plastic body, and the buckle of the second plastic body is clamped in the clamping groove of the sub-stop block. By implementing the embodiment of the application, the position of the second plastic body can be limited, the assembly precision of the second plastic body is effectively improved, and the safety and the reliability of the battery are further determined.

It should be noted that fig. 21 and 22 are structures of the cover plate of the battery cell shown in fig. 18 as an example, and two of the three sub-stop blocks are provided with a slot, so that each second plastic body is provided with two corresponding buckles.

In some possible embodiments, in the cover plates of the battery cells with different structures described above in conjunction with fig. 14 to 19, each sub-stop block may have a different arrangement, and each sub-stop block may also have a different slotting manner.

For example, fig. 21 and 22 show two of the three sub-stop blocks shown in fig. 18 being slotted. In some other implementations, all three of the sub-stop blocks shown in fig. 18 may be slotted (not shown), or one of the two sub-stop blocks shown in fig. 16 may be slotted (not shown), and so on. In general, the advantages of the embodiments described above with reference to fig. 21 and 22 can be achieved by providing slots in any one or more of the sub stop blocks. Accordingly, the foregoing fig. 21 and 22 are to be considered illustrative, and not restrictive.

Optionally, in some possible embodiments, referring to fig. 23, fig. 23 is a schematic plan view of a battery provided in an embodiment of the present application, where the battery includes a cover plate of a battery cell shown in fig. 18. As shown in fig. 23, the battery includes two sets of pole pieces, and each set of pole pieces includes one pole piece (e.g., pole piece 22A and pole piece 22B).

Wherein, a tab 231 of the pole core 22A is welded with a connecting piece in the cover plate 21N of the cell by laser, and after the tab 231 is welded with the connecting piece, a welding mark 2311 is left at the connecting position of the connecting piece and the tab 231; one tab 233 of the core 22B is formed by laser welding a connecting piece in the cover plate 21N of the core, and after the tab 233 is welded to the connecting piece, a welding mark 2331 is left at the joint of the connecting piece and the tab 233. The tab 231 and the tab 233 have the same polarity.

The other tab 232 of the pole core 22A is welded with another connecting piece in the cover plate 21N of the cell by laser, and after the tab 232 is welded with the connecting piece, a welding mark 2321 is left at the connecting position of the connecting piece and the tab 232; the other tab 234 of the core 22B is formed by laser welding another connecting piece in the cover plate 21N of the core, and after the tab 234 is welded to the connecting piece, a welding mark 2341 is left at the joint of the connecting piece and the tab 234.

For a specific structure of the cover plate 21N of the battery cell, reference may be made to the embodiment described in conjunction with fig. 18, and details are not repeated here.

In this embodiment, two pole cores may share a cover plate of one cell. It is to be understood that fig. 24 is an example of the cover plate of the cell provided in fig. 18, and in some other possible embodiments, the cover plate 21N of the cell shown in fig. 24 may be replaced with the cover plate of any one of the cells shown in fig. 3 to 22.

In order to intuitively understand the specific position of the cover plate of the battery cell in the battery, the embodiment of the present application takes the cover plate 21Q of the battery including the battery cell shown in fig. 21 and 22 as an example, and the battery 2 shown in fig. 2 is disassembled and cut. See in particular fig. 24 to 27.

Fig. 24 is an exploded view ofbase:Sub>A battery according to an embodiment of the present disclosure, fig. 25 isbase:Sub>A schematic view of the battery shown in fig. 2, which is exploded after being cut along line B-B, fig. 26 isbase:Sub>A cross-sectional view of the battery shown in fig. 2, which is cut along linebase:Sub>A-base:Sub>A, and fig. 27 is another cross-sectional view of the battery shown in fig. 2, which is cut along linebase:Sub>A-base:Sub>A.

As shown in fig. 24 to 27, the battery includes a cover plate 21Q and two sets of pole pieces 22. The cover plate 21Q of the battery cell includes a first plastic body 2110, two connection pieces (e.g., a connection piece 2414A and a connection piece 2414B), and two second plastic bodies (e.g., a second plastic body 2112A and a second plastic body 2112B). Taking the example that each set of pole core includes one pole core, the same pole tabs of each pole core are respectively pressed together to form the first pole tab 2415A and the second pole tab 2415B.

It should be noted that fig. 26 and fig. 27 only show that the battery is placed at a different angle, and how the second plastic body 2112B limits the second pole ear 2415B can be seen more intuitively from the dashed frame portion in fig. 27.

In some possible embodiments, the first plastic body 2210 is provided with a sub-cover 2413 at the top thereof, and the sub-cover 2413 may be made of plastic. A hole for placing the first injection molding glue 2411A, a hole for placing the second injection molding glue 2411B, and a ventilation hole are formed in the sub-cover plate 2413. The first plastic body 2210 also has a hole corresponding to the hole for placing the first injection molding compound 2511A, and a first terminal of the battery (not shown) can penetrate the sub-cover plate 2413 and the first plastic body 2210, and the connection piece 2414A is connected to the first terminal. Similarly, a second pole (not shown) may be disposed through the sub-cover 2413 and the first plastic body 2110, and the connection pad 2414B is connected to the second pole. For example, if the connection piece 2414A is a positive connection piece and the second connection piece 2414B is a negative connection piece, the first pole can be a positive pole and the second pole can be a negative pole; alternatively, if the connecting piece 2414A is a negative connecting piece and the second connecting piece 2414B is a positive connecting piece, the first electrode column can be a negative electrode column and the second electrode column can be a positive electrode column.

The pole core 22 is connected to the connection piece 2414A via the first tab 2415A, and the second tab 2415B is connected to the second connection piece 2414B.

In general, the first pole column is connected with the first pole ear through one connecting sheet, and the second pole column is connected with the second pole ear through the other connecting sheet. The series connection or the parallel connection of the batteries can establish a connection relationship through the first pole and the second pole of the batteries.

Referring to fig. 28, fig. 28 is a block diagram of an energy storage system according to an embodiment of the present disclosure. As shown in fig. 28, an energy storage system 28 provided by the embodiment of the present application includes a battery 2 and a battery management module 2801 coupled with the battery 2.

Wherein the battery 2 may be embodied as the battery in the embodiments described above in connection with fig. 2 to 27.

The Battery Management module 2801 may be a Battery Management System (BMS) and may manage the state of the Battery 2, such as monitoring the remaining state of charge of the Battery 2, monitoring the Battery temperature of the Battery 2, and so on.

The battery management module 2801 may be implemented as a circuit board, or the circuit board may be placed in a box for plastic packaging, and then the battery management module 2801 may be implemented as a hardware box.

It should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (12)

1. The cover plate of the battery cell is characterized by comprising a first plastic body and one or two connecting sheets; the connecting piece is provided with two connecting parts and a fixing part positioned between the two connecting parts, and the fixing part is used for being fixedly connected with a pole of the battery cell;

the connecting sheet is arranged on the surface of the first plastic body facing the pole core;

the two connecting parts of the connecting sheet are respectively contacted with one tab of each group of pole cores in the two groups of pole cores, the two groups of pole cores are positioned in the electric core, and each group of pole cores comprises one or more pole cores; wherein, the first and the second end of the pipe are connected with each other,

the first plastic body is provided with a first group of stop blocks in a protruding mode on the surface facing the pole core, and the first group of stop blocks are used for limiting the connecting piece to move on the surface of the first plastic body facing the pole core.

2. The cover sheet of claim 1 wherein the first set of stop blocks comprises a first sub-stop block;

the first sub stop block is used for limiting the connecting piece to move in at least one direction of a first direction and a second direction, wherein the first direction is perpendicular to the second direction.

3. The decking of claim 2, wherein the two connection portions include a first connection portion;

the protruding first group of stopper piece of establishing on the surface of the orientation utmost point core of first plastic body specifically includes:

the first connecting portion and the first sub stop block are located on the same side of the fixing portion in the second direction, and the first sub stop block is located on one side of the first connecting portion in the first direction and arranged side by side with the first connecting portion.

4. The cover plate as claimed in claim 3, wherein the first sub-stopper contacts the first connecting portion and the fixing portion.

5. The cover plate as claimed in claim 2, wherein the first set of stop blocks further comprises a second sub-stop block;

the second sub stop block is configured to limit movement of the connecting tab in at least one of a third direction and a fourth direction, wherein the third direction is opposite to the first direction and the fourth direction is opposite to the second direction.

6. The cover sheet according to claim 5, wherein the two connection portions comprise a first connection portion;

the protruding first group of stopper piece of establishing on the surface of the orientation utmost point core of first plastic body specifically includes:

the first connecting portion is located on the same side of the fixing portion in the second direction, and the second sub-stop block is located on one side of the first connecting portion in the fourth direction and located on one side of the fixing portion in the third direction.

7. The cover plate as claimed in claim 6, wherein the second sub-stopper is in contact with the first connecting portion and the fixing portion.

8. The cover plate according to any one of claims 1 to 7, further comprising a second plastic body for limiting the shape of the tab in each set of pole cores; the second plastic body is arranged between the connecting sheet and the tabs in each group of pole cores.

9. The cover plate according to claim 8, wherein one or more sub-stop blocks of the first set of stop blocks are provided with a slot, and the second plastic body is provided with a buckle matched with the slot; wherein the content of the first and second substances,

the buckle of the second plastic body is clamped in the clamping grooves of the one or more sub stop blocks.

10. The cover plate according to any one of claims 1 to 7, wherein a surface of the first plastic body facing the pole core is provided with a boss, one side of the boss in the first direction is provided with one of the two connecting pieces, and one side of the boss in the third direction is provided with the other of the two connecting pieces; the first direction is opposite to the third direction.

11. A battery comprising two sets of pole pieces and a cover plate according to any one of claims 1 to 10; and the cover plate covers the tops of the two groups of pole cores.

12. An energy storage system, characterized in that the energy storage system comprises a battery management module and the battery of claim 11; the battery management module is used for managing the state of the battery.

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