CN221126102U - Battery cell - Google Patents

Abstract

The disclosure discloses a battery, and belongs to the technical field of batteries. The battery comprises a shell component, a cover board component and a battery core component; the battery cell assembly is positioned in the inner cavity of the shell assembly and comprises a plurality of groups of battery cell units, each group of battery cell units comprises at least one battery cell, and a plurality of battery cells in the battery cell assembly are connected in parallel; when the battery cell unit comprises a plurality of battery cells, the battery cells are sequentially stacked along the width direction of the battery cells. The cover plate component comprises a cover plate, two first connecting structures and a second connecting structure, wherein the two first connecting structures are positioned on the cover plate, the cover plate is covered on a port of the shell component, the second connecting structure is positioned between the two first connecting structures, one of the two first connecting structures is an anode connecting structure, and the other first connecting structure is a cathode connecting structure; the positive electrode connecting structure is electrically connected to the positive electrode lug of the battery cell assembly, and the negative electrode connecting structure is electrically connected to the negative electrode lug of the battery cell assembly. The battery has excellent heat dissipation effect and is simple and convenient to assemble.

Description

Battery

Technical Field

The present disclosure relates to the field of battery technology, and in particular to batteries.

Background technique

In order to improve the energy density of the battery, multiple cells are usually connected in parallel or in series to form a large-capacity battery. The large-capacity battery provided by the related art usually connects multiple cells in parallel or in series, and the multiple connected cells are stacked in sequence along the width direction and placed in a shell as a whole. The open end cover of the shell is provided with a cover plate, and a positive pole column and a negative pole column are provided on the cover plate to respectively connect to the total negative pole ear and the total positive pole ear of the cell, thereby realizing the assembly of the battery.

However, the large-capacity battery provided by the related art has a poor heat dissipation effect, resulting in a high temperature rise in the battery.

Utility Model Content

In view of this, the present disclosure provides a battery that can solve the technical problems in the related art.

Specifically, the following technical solutions are included:

A battery, comprising: a shell assembly, a cover assembly and a cell assembly;

The battery cell assembly is located in the inner cavity of the shell assembly, the battery cell assembly includes multiple groups of battery cell units, each group of the battery cell units includes at least one battery cell, and the multiple battery cells in the battery cell assembly are connected in parallel;

The multiple groups of battery cell units are sequentially arranged side by side along a first direction, and when the battery cell unit includes a plurality of battery cells, the plurality of battery cells are sequentially stacked along a second direction, wherein the second direction is perpendicular to the first direction;

The cover plate assembly comprises a cover plate, two first connection structures and a second connection structure located on the cover plate, the cover plate covers the port of the housing assembly, the second connection structure is located between the two first connection structures, one of the first connection structure and the second connection structure is a positive electrode connection structure, and the other is a negative electrode connection structure;

The positive electrode connection structure is electrically connected to the positive electrode tab of the battery cell assembly, and the negative electrode connection structure is electrically connected to the negative electrode tab of the battery cell assembly.

The battery provided by the embodiment of the present disclosure is configured such that the battery cell assembly includes a plurality of groups of battery cell units, and the plurality of groups of battery cell units are sequentially arranged side by side along the length direction of the battery cell. In this way, the number of battery cells stacked along the second direction (i.e., the width direction of the battery cell) can be reduced without affecting the total number of battery cells. This arrangement of the battery cell assembly is not only conducive to improving the density of battery cells in the battery, thereby improving the battery capacity, but also conducive to improving the heat dissipation area of the battery, thereby improving its heat dissipation effect and reducing the temperature rise of the battery. By making the cover plate assembly include two first connection structures and one second connection structure, the second connection structure is located between the two first connection structures, thereby electrically connecting to the positive pole ear and the negative pole ear of the battery cell assembly, and by limiting the arrangement mode and number of the connection structures as mentioned above, this is conducive to simplifying the assembly process of the battery cell assembly and reducing the difficulty of assembling the battery cell assembly.

In some possible implementations, the battery cell assembly includes a first battery cell unit and a second battery cell unit, and the first battery cell unit and the second battery cell unit are arranged side by side along the first direction;

Each of the battery cells in the first battery cell unit and the second battery cell unit has independently arranged positive electrode tabs and negative electrode tabs, one of the multiple positive electrode tabs and the multiple negative electrode tabs is located in the middle area of the battery cell assembly, and the other is correspondingly located in the two side areas of the battery cell assembly.

In some possible implementations, the battery further includes a adapter assembly, which includes a plurality of adapter plates, wherein some of the adapter plates are used to electrically connect the positive electrode connection structure to the positive electrode tab, and another portion of the adapter plates are used to electrically connect the negative electrode connection structure to the negative electrode tab.

In some possible implementations, the adapter includes: a first connecting segment and a second connecting segment, the first connecting segment includes a converging segment and a plurality of branch segments;

The second connecting section is connected to the first side of the converging section, and the second connecting section is used to be electrically connected to the first connecting structure or the second connecting structure;

The plurality of branch segments are connected to the second side of the converging segment, and the plurality of branch segments are arranged at intervals along the second direction, and each of the branch segments is used to be electrically connected to the positive electrode tab or the negative electrode tab at a corresponding position.

In some possible implementations, at least one of the plurality of branch segments is detachably connected to the converging segment.

In some possible implementations, the battery cell assembly includes at least three groups of battery cell units, and two groups of battery cell units among the at least three groups of battery cell units are the first battery cell units and the second battery cell units;

Another battery cell located on the side of at least one of the first battery cell unit and the second battery cell unit is configured so that at least one of its positive electrode tab and negative electrode tab is connected to the positive electrode tab or negative electrode tab of the first battery cell unit or the second battery cell unit through a lead-out structure.

In some possible implementations, the positive electrode tab and the negative electrode tab are respectively located at different positions of the end of the battery cell facing the cover plate assembly, or the positive electrode tab and the negative electrode tab are respectively located at different positions on the side of the battery cell.

In some possible implementations, the battery cell assembly includes at least three groups of battery cell units, and the plurality of battery cells are configured to lead out two first total pole tabs and a second total pole tab, wherein the second total pole tab is located between the two first total pole tabs;

One of the first total electrode tab and the second total electrode tab is a positive electrode tab, and the other is a negative electrode tab.

In some possible implementations, the first connection structure and the second connection structure are both in the form of poles.

In some possible implementations, one of the first connection structure and the second connection structure is integrally formed with the cover plate, and the cover plate is a conductive plate body, and the other of the first connection structure and the second connection structure is in the form of a pole.

In some possible implementations, the first connection structure is integrally formed with the cover plate, and the first connection structure is recessed toward a direction close to the battery cell assembly.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a first exemplary battery provided by an embodiment of the present disclosure;

FIG2 is an exploded view of a first exemplary battery provided by an embodiment of the present disclosure;

FIG3 is a cross-sectional view of a first exemplary battery provided in an embodiment of the present disclosure;

FIG4 is a partial enlarged view of the A1 area in FIG3 provided by an embodiment of the present disclosure;

FIG5 is a partial enlarged view of the area A2 in FIG3 provided by an embodiment of the present disclosure;

FIG6 is a schematic diagram of a partial structure of a first exemplary battery provided in an embodiment of the present disclosure;

FIG7 is a schematic diagram of the structure of an exemplary adapter provided in an embodiment of the present disclosure;

FIG8 is a schematic diagram of the structural arrangement of a battery provided by an embodiment of the present disclosure when the battery contains three groups of battery cells;

FIG9 is a schematic diagram of the structural arrangement of a battery provided by an embodiment of the present disclosure when the battery contains four groups of battery cells;

FIG10 is a schematic diagram of the structural arrangement of a cell assembly when the side portion of the tab of a battery provided by an embodiment of the present disclosure is led out;

FIG11 is a diagram of a second exemplary battery assembly provided by an embodiment of the present disclosure;

FIG12 is a partial cross-sectional view of a second exemplary battery provided by an embodiment of the present disclosure;

FIG13 is a schematic diagram of the structure of a cover plate assembly in a second exemplary battery provided by an embodiment of the present disclosure from a top view;

FIG. 14 is a schematic diagram of the structure of the cover assembly in the exemplary battery provided in an embodiment of the present disclosure when viewed from a bottom perspective.

The reference numerals represent:

100. Shell assembly;

11. Outer shell; 12. Inner shell;

200, cover plate assembly;

21. Cover plate; 22. First connection structure; 23. Second connection structure;

24. Insulating partition; 25. Explosion-proof valve; 26. Liquid injection hole;

300. Battery cell assembly;

31. Battery cell unit;

3101, first battery cell unit; 3102, second battery cell unit; 3103, third battery cell unit; 3104, fourth battery cell unit;

311, battery cell; 312, positive electrode tab; 313, negative electrode tab;

32. Positioning parts;

400, adapter assembly;

41. Adapter; 411. First connecting section; 4111. Converging section; 4112. Branching section; 412. Second connecting section.

Detailed ways

The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

In the description of the present disclosure, it should be understood that the terms "length", "width", "thickness", "up", "down", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure. When the product is placed in different postures, the orientation may change, for example, "up" and "down" may be interchangeable. In the embodiment of the present disclosure, the orientation of the cover assembly is defined as "fixed" or "up".

The embodiment of the present disclosure provides a battery, as shown in Figures 1-2, the battery includes: a shell assembly 100, a cover assembly 200 and a battery cell assembly 300. As shown in Figure 2, the battery cell assembly 300 is located in the inner cavity of the shell assembly 100, and the battery cell assembly 300 includes multiple groups of battery cell units 31, each group of battery cell units 31 includes at least one battery cell 311, and multiple battery cells 311 in the battery cell assembly 300 are connected in parallel.

The multiple groups of battery cell units 31 are sequentially arranged side by side along the first direction, and when the battery cell unit 31 includes multiple battery cells 311 , the multiple battery cells 311 are sequentially stacked along the second direction, wherein the second direction is perpendicular to the first direction.

The cover plate assembly 200 includes a cover plate 21, two first connection structures 22 and a second connection structure 23 located on the cover plate 21, the cover plate 21 covers the port of the housing assembly 100, the second connection structure 23 is located between the two first connection structures 22, one of the first connection structure 22 and the second connection structure 23 is a positive connection structure, and the other is a negative connection structure. The positive connection structure is electrically connected to the positive electrode tab 312 of the battery cell assembly 300, and the negative connection structure is electrically connected to the negative electrode tab 313 of the battery cell assembly 300.

In the embodiment of the present disclosure, the battery cell 311 is generally of rectangular or quasi-rectangular outline, as shown in FIG3 . The first direction D1 involved in the embodiment of the present disclosure is the same as the length direction of the battery cell 311 , and the second direction is perpendicular to the first direction. Combined with FIG6 , the second direction D2 is the same as the width direction of the battery cell 311 .

The battery provided by the embodiment of the present disclosure is configured such that the battery cell assembly 300 includes multiple groups of battery cell units 31, and the multiple groups of battery cell units 31 are arranged side by side in sequence along the length direction of the battery cell 311. In this way, the number of battery cells 311 stacked along the second direction (i.e., the width direction of the battery cell 311) can be reduced without affecting the total number of battery cells 311. This arrangement of the battery cell assembly 300 is not only conducive to improving the density of the battery cells in the battery, thereby improving the battery capacity, but also conducive to improving the heat dissipation area of the battery, thereby improving its heat dissipation effect and reducing the temperature rise of the battery. By making the cover plate assembly 200 include two first connection structures 22 and one second connection structure 23, the second connection structure 23 is located between the two first connection structures 22, so as to be electrically connected to the positive pole ear 312 and the negative pole ear 313 of the battery cell assembly 300, and by limiting the arrangement mode and number of the connection structure as mentioned above, it is conducive to simplifying the assembly process of the battery cell assembly 300 and reducing the difficulty of assembling the battery cell assembly 300.

The following is an exemplary description of the structural arrangement and functions of various components in the battery involved in the embodiments of the present disclosure.

For the shell assembly 100, in some examples, as shown in FIG. 2, the shell assembly 100 includes an outer shell 11 and an inner shell 12, wherein the inner shell 12 is made of insulating material to achieve insulation between the battery cell assembly 300 and the outer shell 11, and the upper ends of the outer shell 11 and the inner shell 12 are both open, and the cover plate assembly 200 is connected to the open end of the outer shell 11, and the connection method between the two can be welding, clamping, buckling, etc.

Exemplarily, the material of the inner shell 12 includes, but is not limited to, polypropylene (PP), polyphenylene sulfide (PPS), polyethylene (PE), polyethylene glycol terephthalate (PET), etc.

The battery cell assembly 300 includes a plurality of battery cells 311. In the embodiment of the present disclosure, as shown in FIG. 6 , the shape of the battery cell 311 may be a rectangular shape or a quasi-rectangular shape. For example, the structures and sizes of the plurality of battery cells 311 are the same, such as being rectangular. This facilitates standardization of the structure of the battery cells 311, thereby simplifying the assembly process of the battery cells 311.

6 , the first direction D1 involved in the embodiment of the present disclosure is the length direction of the battery cell 311 , and the second direction D2 involved is the width (ie, thickness) direction of the battery cell 311 .

In some examples, as shown in FIG. 6 , the battery cell assembly 300 further includes a positioning member 32, which is used to position the multiple battery cells 311. The positioning member 32 can be a belt-like structure such as a binding belt or an adhesive tape, or a plate-like structure such as a positioning bottom plate or a positioning side plate.

For example, FIG6 illustrates that the positioning member 32 is a positioning base plate, and the positioning member 32 in the form of a positioning base plate and the bottom of the battery cell 311 are provided with matching positioning structures (such as positioning columns and positioning holes), so that the multiple battery cells 311 are stabilized in their installation positions.

In some implementations, as shown in FIG. 6 , the battery cell assembly 300 provided in the embodiment of the present disclosure includes a first battery cell unit 3101 and a second battery cell unit 3102, which are arranged side by side along a first direction; each battery cell 311 in the first battery cell unit 3101 and the second battery cell unit 3102 has an independently arranged positive electrode tab 312 and a negative electrode tab 313. One of the plurality of positive electrode tabs 312 and the plurality of negative electrode tabs 313 is located in the middle region of the battery cell assembly 300, and the other is correspondingly located in the two side regions of the battery cell assembly 300.

In this implementation, the first battery cell unit 3101 and the second battery cell unit 3102 are arranged side by side in sequence along the length direction of the battery cell 311, and when the first battery cell unit 3101 and the second battery cell unit 3102 both include multiple battery cells 311, the multiple battery cells 311 in the same battery cell unit 31 are stacked in sequence along the width direction of the battery cell 311.

The multiple cells 311 included in the first cell unit 3101 and the second cell unit 3102 all have independently arranged positive electrode tabs 312 and negative electrode tabs 313. The two sides of the first cell unit 3101 and the second cell unit 3102 sequentially distributed along the first direction are respectively referred to as the first side and the second side. It can be seen that the second side of the first cell unit 3101 is adjacent to the first side of the second cell unit 3102.

One example is, as shown in FIG6 , the multiple positive pole tabs 312 corresponding to the first battery cell unit 3101 and the second battery cell unit 3102 are arranged in the middle area of the battery cell assembly 300 , and the multiple negative pole tabs 313 corresponding to the first battery cell unit 3101 and the second battery cell unit 3102 are arranged in the two side areas of the battery cell assembly 300 .

That is, the positive pole tabs 312 of the battery cells 311 contained in the first battery cell unit 3101 are all arranged on the second side of the first battery cell unit 31, and the positive pole tabs 312 of the battery cells 311 contained in the second battery cell unit 3102 are all arranged on the first side of the second battery cell unit 31, so that the multiple positive pole tabs 312 corresponding to the first battery cell unit 3101 and the second battery cell unit 3102 are located in the middle area of the battery cell assembly 300. Correspondingly, the negative pole tabs 313 of the battery cells 311 contained in the first battery cell unit 3101 are all arranged on the first side of the first battery cell unit 3101, and the negative pole tabs 313 of the battery cells 311 contained in the second battery cell unit 3102 are all arranged on the second side of the second battery cell unit 3102, so that the multiple negative pole tabs 313 corresponding to the first battery cell unit 3101 and the second battery cell unit 3102 are correspondingly arranged on the two side areas of the battery cell assembly 300.

Another example is that the multiple negative electrode tabs 313 corresponding to the first battery cell unit 3101 and the second battery cell unit 3102 are arranged in the middle area of the battery cell assembly 300, and the multiple positive electrode tabs 312 corresponding to the first battery cell unit 3101 and the second battery cell unit 3102 are correspondingly arranged in the two side areas of the battery cell assembly 300 (not shown in the figure).

That is to say, the negative electrode tabs 313 of the battery cells 311 contained in the first battery cell unit 3101 are all arranged on the second side of the first battery cell unit 3101, and the negative electrode tabs 313 of the battery cells 311 contained in the second battery cell unit 3102 are all arranged on the first side of the second battery cell unit 3102. Correspondingly, the positive electrode tabs 312 of the battery cells 311 contained in the first battery cell unit 3101 are all arranged on the first side of the first battery cell unit 3101, and the positive electrode tabs 312 of the battery cells 311 contained in the second battery cell unit 3102 are all arranged on the second side of the second battery cell unit 3102.

By performing the above-mentioned position distribution on the positive pole tabs 312 and the negative pole tabs 313 of the first battery cell unit 3101 and the second battery cell unit 3102, it is not necessary to perform additional other processing on the positive pole tabs 312 and the negative pole tabs 313 of the battery cell 311 to ensure that the pole tabs of the same polarity are gathered in the same area, which is conducive to simplifying the connection between the pole tabs and the connection structure on the cover plate 21, and is conducive to improving the connection reliability. For example, when the pole tabs of the same polarity are gathered in the same area, a transfer structure can be designed to synchronously transfer multiple pole tabs of the same polarity to the same connection structure on the cover plate 21, so that the connection structure corresponding to the pole tabs in the same area on the cover plate 21 can be designed as one. Alternatively, this is also conducive to connecting the pole tabs located in the same area to a total pole tab, which is directly or indirectly electrically connected to the connection structure on the cover plate 21 through the transfer structure, which is particularly beneficial for simplifying the assembly difficulty and assembly complexity of the pole tabs and the connection structure.

In some examples, as shown in Figures 2 to 5, the battery provided by the embodiments of the present disclosure also includes a transfer assembly 400, which includes a plurality of transfer sheets 41, wherein some of the transfer sheets 41 are used to electrically connect the positive electrode connection structure to the positive electrode tab 312, and another part of the transfer sheets 41 are used to electrically connect the negative electrode connection structure to the negative electrode tab 313.

In combination with the above implementation method, multiple positive electrode tabs 312 located in the same area and belonging to the same battery cell unit 31 are electrically connected to the positive electrode connection structure using an adapter plate 41, and multiple negative electrode tabs 313 located in the same area and belonging to the same battery cell unit 31 are electrically connected to the negative electrode connection structure using another different adapter plate 41.

This method is not only conducive to simplifying the arrangement of the pole ears in the battery cell 311 and the arrangement of the connection structure in the cover plate 21, but also has stronger adaptability to the increase or decrease in the number of battery cells 311 in the battery cell assembly 300. The number of battery cells 311 can be increased or decreased at will without changing the structure of the battery cell 311 and the cover plate 21.

6 , for the battery cell assembly 300 including the first battery cell unit 3101 and the second battery cell unit 3102, four adapters 41 can be used, and the positive electrode tab 312 located in the same area of the first battery cell unit 3101 and the negative electrode tab 313 located in the same area are each connected to a corresponding adapter 41. The positive electrode tab 312 located in the same area of the second battery cell unit 3102 and the negative electrode tab 313 located in the same area are each connected to a corresponding adapter 41.

Of course, the embodiment of the present disclosure does not exclude another example, that is, the positive electrode connection structure is directly connected to the positive electrode tab 312 , and the negative electrode connection structure is directly connected to the negative electrode tab 313 .

In some examples, as shown in FIG. 7 , the adapter 41 includes: a first connecting segment 411 and a second connecting segment 412, the first connecting segment 411 includes a converging segment 4111 and a plurality of branch segments 4112; the second connecting segment 412 is connected to a first side of the converging segment 4111, and in combination with FIG. 4 and FIG. 5 , it can be seen that the second connecting segment 412 is used to be electrically connected to the first connecting structure 22 or the second connecting structure 23; a plurality of branch segments 4112 are connected to a second side of the converging segment 4111, and the plurality of branch segments 4112 are arranged at intervals along the second direction, and in combination with FIG. 4 and FIG. 5 , it can be seen that each branch segment 4112 is used to be electrically connected to the positive electrode tab 312 or the negative electrode tab 313 at the corresponding position.

The number of branch segments 4112 is designed according to the number of battery cells 311 included in each battery cell unit 31. In the embodiment of the present disclosure, the first battery cell unit 3101 and the second battery cell unit 3102 each independently include at least one battery cell 311, for example, both include two or more battery cells 311. In some examples, the number of battery cells 311 included in the first battery cell unit 3101 is the same as the number of battery cells 311 included in the second battery cell unit 3102.

For example, Fig. 6 illustrates that the battery cell unit 31 includes two stacked battery cells 311, and accordingly, Fig. 7 illustrates that the first connecting segment 411 includes two branch segments 4112. For example, the two branch segments 4112 cooperate with the converging segment 4111 to form a U-shape.

In some examples, the branch segments 4112 may also be arranged in larger numbers, for example, 3 or more (3-10, etc.).

By designing the structure of the adapter plate 41 as described above, a plurality of pole ears of the same polarity are connected in parallel using the first connecting section 411, and a plurality of pole ears of the same polarity are connected to the same connecting structure using the second connecting section 412, thereby achieving a fast and reliable connection between the connecting structure on the cover plate 21 and the plurality of pole ears of the same polarity.

In some examples, the adapter sheet 41 of corresponding structure is selected according to the number of battery cells 311 contained in each battery cell unit 31 , so that when adding or reducing battery cells 311 in the battery cell assembly 300 , the adapter sheet 41 of corresponding structure can be adaptively selected according to the number of battery cells 311 .

In other examples, the number of branch segments 4112 in the adapter 41 is made sufficient, and the number of battery cells 311 in the battery cell unit 31 can be increased or decreased at will while keeping the number of adapters 41 unchanged.

For example, at least one of the multiple branch segments 4112 is detachably connected to the convergent segment 4111, and the detachable connection method may be a male-female buckle connection, a plug-in connection, a snap-on connection, etc. In this way, the number of branch segments 4112 can be added at will, and the number of branch segments 4112 can be selected accordingly according to the number of cells 311 contained in each cell unit 31, ensuring that each cell 311 is connected to a branch segment 4112, ensuring that the structure of the adapter 41 matches the number of cells 311, which improves the flexibility of cell assembly.

For the multiple positive pole tabs or multiple negative pole tabs arranged in the middle area of the battery cell assembly 300, two symmetrically arranged adapter plates 41 can be set, and the first connecting sections 411 of the two adapter plates 41 are respectively electrically connected to the positive pole tabs or negative pole tabs of the corresponding battery cell 311, and the second connecting sections 412 of the two adapter plates 41 are stacked along the height direction of the battery cell (i.e., the up and down direction in Figure 6) to achieve connection.

It can be seen that the embodiment of the present disclosure can standardize the size of the battery cell 311 by connecting the first battery cell unit 3101 and the second battery cell unit 3102 in parallel laterally and using the adapter sheet 41 with the above-mentioned structural arrangement. In this way, the battery capacity can be increased or decreased by increasing or decreasing the number of battery cells 311 of standardized size, thereby avoiding the preparation of large-size battery cells and reducing the difficulty and cost of preparing large-capacity batteries. At the same time, this is also conducive to improving the heat dissipation effect of the battery.

In some examples, in the battery provided by the embodiments of the present disclosure, the plurality of battery cells 311 are standardized battery cells having the same structure and size to facilitate addition and reduction.

In some implementations, referring to FIG8 and FIG9 , the battery cell assembly 300 includes at least three groups of battery cell units 31, of which two groups of battery cell units 31 are respectively the first battery cell unit 3101 and the second battery cell unit 3102. Another battery cell unit 31 located on the side of at least one of the first battery cell unit 3101 and the second battery cell unit 3102 is configured such that at least one of its positive electrode tab and negative electrode tab is connected to the positive electrode tab 312 or negative electrode tab 313 of the first battery cell unit 3101 or the second battery cell unit 3102 through a lead-out structure. The lead-out structure may be a wire or a conductive sheet.

In some examples, the cell unit 31 adjacent to the first cell unit 3101 and/or the second cell unit 3102 may be configured such that the positive electrode tab of the cell unit 31 is adjacent to the positive electrode tab of the adjacent first cell unit 3101 or the second cell unit 3102, and the negative electrode tabs are connected via a lead-out structure. Alternatively, the negative electrode tab of the cell unit 31 is adjacent to the negative electrode tab of the adjacent first cell unit 3101 or the second cell unit 3102, and the positive electrode tabs are connected via a lead-out structure.

For example, as shown in FIG8 , the battery cell assembly 300 includes three groups of battery cell units 31, and the three groups of battery cell units 31 are sequentially referred to as the first battery cell unit 3101, the second battery cell unit 3102, and the third battery cell unit 3103 in the order of arrangement in the first direction. Among them, the arrangement of the first battery cell unit 3101, the second battery cell unit 3102, and the adapter plates 41 on both can refer to the above, for example, the arrangement shown in FIG6 can be referred to. The negative pole tab of the third battery cell unit 3103 is adjacent to the negative pole tab of the second battery cell unit 3102, so that two adapter plates 41 are used here for connection (such as the arrangement of two adapter plates 41 in the middle area of FIG6), and the positive pole tab of the third battery cell unit 3103 can be connected to the positive pole tab 312 of the second battery cell unit 3102 through a lead-out structure such as a wire or a conductive sheet.

Similarly, as shown in FIG9 , if the battery cell assembly 300 includes four groups of battery cell units 31, the four groups of battery cell units 31 are sequentially referred to as the fourth battery cell unit 3104, the first battery cell unit 3101, the second battery cell unit 3102, and the third battery cell unit 3103 in the order of arrangement in the first direction. Among them, the arrangement of the first battery cell unit 3101, the second battery cell unit 3102, the third battery cell unit 3103 and the adapter plates 41 thereon can refer to the above, for example, the arrangement shown in FIG8 can be referred to. The negative pole tab of the fourth battery cell unit 3104 is adjacent to the negative pole tab of the first battery cell unit 3101, so that two adapter plates 41 are used here for connection (such as the arrangement of two adapter plates 41 in the middle area of FIG6 ), and the positive pole tab of the fourth battery cell unit 3104 can be connected to the positive pole tab 312 of the first battery cell unit 3101 through a lead-out structure such as a wire or a conductive sheet.

In the embodiment of the present disclosure, the lead-out method of the positive electrode tab 312 and the negative electrode tab 313 in the battery cell 311 includes but is not limited to the following: the positive electrode tab 312 and the negative electrode tab 313 are respectively located at different positions of the top of the battery cell 311 facing the cover assembly 200, that is, the tabs are led out from the top of the battery cell 311. Alternatively, the positive electrode tab 312 and the negative electrode tab 313 are respectively located at different positions on the side of the battery cell 311, that is, the tabs are led out from the side of the battery cell 311.

6 illustrates that the positive electrode tab 312 and the negative electrode tab 313 are respectively located at different positions of the top of the battery cell 311 facing the cover assembly 200. In this example, the cover assembly 200 includes a transfer plate 41, in which the first connecting section 411 and the second connecting section 412 are arranged coplanarly.

FIG10 illustrates that the positive electrode tab 312 and the negative electrode tab 313 are respectively located at different positions on the side of the battery cell 311. In this example, the cover assembly 200 includes a transition piece 41, in which the first connecting section 411 and the second connecting section 412 are bent.

In some examples, the embodiments of the present disclosure may provide such a battery, as shown in FIGS. 2 to 7 , wherein the battery cell assembly 300 includes two groups of battery cell units 31, and each group of battery cell units 31 includes a plurality of battery cells 311 sequentially stacked along the width direction of the battery cell 311. The plurality of positive pole tabs 312 corresponding to the first battery cell unit 3101 and the second battery cell unit 3102 are arranged in the middle region of the battery cell assembly 300, and the plurality of negative pole tabs 313 corresponding to the first battery cell unit 3101 and the second battery cell unit 3102 are arranged in the two side regions of the battery cell assembly 300. Alternatively, the plurality of negative pole tabs 313 corresponding to the first battery cell unit 3101 and the second battery cell unit 3102 are arranged in the middle region of the battery cell assembly 300, and the plurality of positive pole tabs 312 corresponding to the first battery cell unit 3101 and the second battery cell unit 3102 are arranged in the two side regions of the battery cell assembly 300.

The battery also includes a plurality of adapter plates 41, which include: a first connecting segment 411 and a second connecting segment 412 arranged in the same plane, the first connecting segment 411 including a converging segment 4111 and a plurality of branch segments 4112; the second connecting segment 412 is connected to a first side of the converging segment 4111, and the second connecting segment 412 is used to be electrically connected to the first connecting structure 22 or the second connecting structure 23; a plurality of branch segments 4112 are connected to a second side of the converging segment 4111, and the plurality of branch segments 4112 are arranged at intervals along the second direction, and each branch segment 4112 is used to be electrically connected to the positive electrode tab 312 or the negative electrode tab 313 at a corresponding position.

In some implementations, as shown in FIG2 , the first connection structure 22 and the second connection structure 23 are both in the form of poles. That is, one of the first connection structure 22 and the second connection structure 23 is a positive pole, and the other is a negative pole.

The first connection structure 22 and the second connection structure 23 in the form of poles are insulated from the cover plate 21 , which can be achieved not only by the above-mentioned insulating partition 24 , but also by further providing an insulating layer on the outer side of the pole.

In other implementations, as shown in FIGS. 11-14 , one of the first connection structure 22 and the second connection structure 23 is integrally formed on the cover plate 21 , and the cover plate 21 is a conductive plate, and the other of the first connection structure 22 and the second connection structure 23 is in the form of a pole.

By making one of the first connecting structure 22 and the second connecting structure 23 integrally formed on the cover plate 21, that is, making a specific position on the cover plate 21 of conductive material as a connecting structure, the connecting structure is also conductive, so that electrical conduction between the connecting structure and the pole ear can be achieved. At the same time, the other one of the first connecting structure 22 and the second connecting structure 23 is set as a pole, and the pole can be easily designed to be insulated from the cover plate 21, thereby ensuring mutual insulation between the first connecting structure 22 and the second connecting structure 23.

This implementation method is beneficial to reducing the number of poles, simplifying the structure of the cover plate assembly 200, and reducing the manufacturing cost of the battery.

In some examples, as shown in Figures 12, 13 and 14, the first connection structure 22 is integrally formed on the cover plate 21, and accordingly, the second connection structure 23 is in the form of a pole, so that the cover plate assembly 200 is only provided with one pole. The first connection structure 22 is arranged concavely toward the direction close to the battery cell assembly 300, for example, the first connection structure 22 includes a side surrounding portion and a bottom plate portion, one end of the side surrounding portion is connected to the main body of the cover plate 21, and the other end of the side surrounding portion extends toward the direction close to the battery cell assembly 300, so that the other end of the side surrounding portion is connected to the bottom plate portion, so that the first connection structure 22 serves as a "fake" pole, which is conducive to enhancing the connection identification function.

By making the first connection structure 22 recessed toward the direction close to the battery cell assembly 300 , the distance between the first connection structure 22 and the battery cell assembly 300 is reduced, thereby facilitating the connection operation between the first connection structure 22 and the tab of the battery cell 311 .

In the disclosed embodiment, the cover plate assembly 200 further includes an insulating partition 24, an explosion-proof valve component 25 and an injection hole 26. The insulating partition 24 is located between the cover plate 21 and the battery cell assembly 300; the explosion-proof valve component 25 is arranged on the cover plate 21 and passes through the insulating partition 24; the injection hole 26 passes through the cover plate 21 and the insulating partition 24.

The first connection structure 22 and the second connection structure 23 penetrate the insulating partition 24 and are arranged on the cover plate 21. By providing the insulating partition 24, the first connection structure 22 and the second connection structure 23 are insulated from each other, thereby preventing the battery from short circuiting.

When the water content in the battery cell 311 exceeds the standard, the battery is overcharged or over-discharged, the battery is short-circuited, squeezed, or other abuses, the battery may produce gas, catch fire, or even explode. By providing the explosion-proof valve 25, when the gas pressure inside the battery reaches the bursting pressure of the explosion-proof valve 25, the explosion-proof valve 25 ruptures, thereby discharging the gas inside the battery, thereby preventing the battery from exploding due to gas expansion.

After the cover assembly 200 is assembled with the shell, electrolyte is injected into the battery cell 311 through the injection hole 26, and then the injection hole 26 is sealed. For example, laser welding can be used to seal the injection hole 26 with a sealing nail.

When the number of battery cells 311 increases, the capacity of the battery increases accordingly, and the number of explosion-proof valve components 25 and injection holes 26 can be increased accordingly, so that the number of explosion-proof valve components 25 and injection holes 26 is greater than one.

The battery provided in the embodiment of the present disclosure includes but is not limited to a lithium ion battery, a sodium ion battery, etc. For the sodium ion battery, the foil material thereof is aluminum foil, which is more convenient for welding.

The above description is only for the purpose of facilitating those skilled in the art to understand the technical solution of the present disclosure and is not intended to limit the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims (10)

1. A battery, the battery comprising: a housing assembly (100), a cover assembly (200), and a battery cell assembly (300);

the battery cell assembly (300) is positioned in the inner cavity of the shell assembly (100), the battery cell assembly (300) comprises a plurality of groups of battery cell units (31), each group of battery cell units (31) comprises at least one battery cell (311), and a plurality of battery cells (311) in the battery cell assembly (300) are connected in parallel;

the plurality of groups of battery cells (31) are sequentially arranged side by side along a first direction, and when the battery cells (31) comprise a plurality of battery cells (311), the plurality of battery cells (311) are sequentially arranged in a stacked manner along a second direction, wherein the second direction is perpendicular to the first direction;

The cover plate assembly (200) comprises a cover plate (21), two first connecting structures (22) and one second connecting structure (23) which are positioned on the cover plate (21), the cover plate (21) covers the port of the shell assembly (100), the second connecting structure (23) is positioned between the two first connecting structures (22), one of the first connecting structures (22) and the second connecting structure (23) is an anode connecting structure, and the other is a cathode connecting structure;

the positive electrode connecting structure is electrically connected to a positive electrode tab (312) of the battery cell assembly (300), and the negative electrode connecting structure is electrically connected to a negative electrode tab (313) of the battery cell assembly (300).

2. The battery according to claim 1, wherein the cell assembly (300) comprises a first cell unit (3101) and a second cell unit (3102), the first cell unit (3101) and the second cell unit (3102) being arranged side by side along the first direction;

Each of the first and second battery cells (3101, 3102) has an independently arranged positive electrode tab (312) and negative electrode tab (313), one of the positive electrode tab (312) and the negative electrode tab (313) being located in a middle region of the battery cell assembly (300), and the other being located in respective side regions of the battery cell assembly (300).

3. The battery of claim 2, further comprising a transfer assembly (400), the transfer assembly (400) comprising a plurality of transfer tabs (41), wherein a portion of the transfer tabs (41) are used to electrically connect the positive connection structure to the positive tab (312) and another portion of the transfer tabs (41) are used to electrically connect the negative connection structure to the negative tab (313).

4. A battery according to claim 3, wherein the adapter tab (41) comprises: a first connection section (411) and a second connection section (412), the first connection section (411) comprising a converging section (4111) and a plurality of diverging sections (4112);

The second connection section (412) is connected to the first side of the convergence section (4111), and the second connection section (412) is used for electrically connecting with the first connection structure (22) or the second connection structure (23);

The plurality of branch segments (4112) are connected to the second side of the convergence segment (4111), the plurality of branch segments (4112) are arranged at intervals along the second direction, and each branch segment (4112) is used for being electrically connected with the positive electrode tab (312) or the negative electrode tab (313) at a corresponding position.

5. The battery of claim 4, wherein at least one of the plurality of branch segments (4112) is detachably connected to the convergence segment (4111).

6. The battery according to claim 2, wherein the cell assembly (300) comprises at least three groups of cell units (31), two groups of cell units (31) of the at least three groups of cell units (31) being the first cell unit (3101) and the second cell unit (3102), respectively;

The other cell (31) located at the side of at least one of the first cell (3101) and the second cell (3102) is configured such that at least one of the positive electrode tab and the negative electrode tab thereof is connected to the positive electrode tab (312) or the negative electrode tab (313) of the first cell (3101) or the second cell (3102) through a lead-out structure.

7. The battery according to claim 2, wherein the positive electrode tab (312) and the negative electrode tab (313) are located at different positions of the end of the cell (311) facing the cap plate assembly (200), respectively, or the positive electrode tab (312) and the negative electrode tab (313) are located at different positions of the side of the cell (311), respectively.

8. The battery according to any one of claims 1-7, characterized in that the first connection structure (22) and the second connection structure (23) are both in the form of a pole.

9. The battery according to any one of claims 1-7, wherein one of the first connection structure (22) and the second connection structure (23) is integrally formed with the cover plate (21), and the cover plate (21) is a conductive plate body, and the other of the first connection structure (22) and the second connection structure (23) is in the form of a post.

10. The battery according to claim 9, wherein the first connection structure (22) is integrally formed to the cover plate (21), and the first connection structure (22) is concavely arranged in a direction approaching the cell assembly (300).