Battery cell module and battery

Abstract

The utility model relates to the technical field of batteries, and provides a battery cell module and a battery, the battery cell module comprises a first battery cell unit, a second battery cell unit and a switching structure, the first battery cell unit comprises a first tab structure, the first tab structure comprises a first tab, the second battery cell unit comprises a second tab structure, the second tab structure comprises a second tab, and the first tab structure comprises a first tab and a second tab. The switching structure comprises a connecting piece, the first tab structure is connected to the first side of the connecting piece, the first tab structure covers the connecting piece, the second tab structure is connected to the second side of the connecting piece, the second tab structure covers the connecting piece, and the first tab structure and the second tab structure are connected to the second side of the connecting piece. And the first tab structure and / or the second tab structure are / is also provided with a protection sheet. According to the invention, the welding yield can be improved on the premise of improving the energy density of the battery.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell module and a battery. Background Art

[0002] The battery cell module includes at least two battery cell units, and the ends of the battery cell units are provided with tabs. The two battery cell units are connected by welding the tabs together to the connecting pieces. After the battery cell module is assembled into the shell, a battery is formed.

[0003] At present, the tabs occupy a large amount of top space of the outer shell, thereby affecting the effective space ratio of the battery cell unit. Under the condition of a certain outer shell size, it is not conducive to the formation of a high energy density battery. In addition, the tabs are usually welded directly to the connecting pieces, and the welding yield is not high. Utility Model Content

[0004] The present application provides a battery cell module and a battery, which can improve the welding yield while improving the battery energy density.

[0005] One aspect of the present application provides a battery cell module, comprising:

[0006] A first battery cell unit includes a first tab structure, wherein the first tab structure includes a first tab;

[0007] The second battery cell unit includes a second tab structure, wherein the second tab structure includes a second tab;

[0008] The transfer structure includes a connecting piece connected between a first tab structure and a second tab structure, wherein the first tab structure is connected to a first side of the connecting piece and covers the connecting piece, and the second tab structure is connected to a second side of the connecting piece and covers the connecting piece.

[0009] Wherein, the first tab structure includes a protective sheet, the protective sheet and the first tab are welded to the connecting sheet, or the protective sheet is welded to the connecting sheet.

[0010] And / or, the second tab structure includes a protection sheet, and the protection sheet and the second tab are welded to the connection sheet or the protection sheet is welded to the connection sheet.

[0011] In the battery cell module in the embodiment of the present application, the first pole lug structure and the second pole lug structure can both cover and be connected to the connecting sheet, which can reduce the space occupied by the first pole lug structure and the second pole lug structure. After the battery cell module is assembled into the outer shell, the effective space ratio of the battery cell module can be increased, which is beneficial to improving the energy density of the battery. At the same time, the provision of the protective sheet can improve the welding yield, thereby improving the battery yield.

[0012] In one possible implementation, the first battery cell unit includes a first body, and the first tab structure is provided on the first body;

[0013] The second battery cell unit includes a second main body, the second tab structure is arranged on the second main body, the first tab structure, the second tab structure, the first main body and the second main body can form an installation area, and the connecting piece is arranged in the installation area.

[0014] In one possible implementation, the first body and the second body have the same height, the first tab structure and the second tab structure have the same height, and the first tab structure and the second tab structure are arranged opposite to each other;

[0015] Alternatively, the first body and the second body are of the same height, the first tab structure and the second tab structure are of the same height, and the first tab structure and the second tab structure are staggered.

[0016] In one possible implementation, the first battery cell unit and the second battery cell unit are arranged in close contact with each other.

[0017] In one possible implementation, the first body and the second body have the same height, the first tab structure and the second tab structure have the same height, and the first tab structure and the second tab structure are arranged opposite to each other;

[0018] Alternatively, the first body and the second body are of the same height, the first tab structure and the second tab structure are of the same height, and the first tab structure and the second tab structure are staggered.

[0019] In one possible implementation, the switching structure further includes:

[0020] An insulating sheet is arranged below the connecting sheet and is integrally formed with the connecting sheet.

[0021] In one possible implementation, the first pole tab includes a first pole tab welding portion and a first pole tab connecting portion, the first pole tab connecting portion connects the first main body and the first pole tab welding portion, the first pole tab welding portion is bent relative to the first pole tab connecting portion and covers the connecting sheet, and the protective sheet is welded to the first pole tab welding portion; and / or, the second pole tab includes a second pole tab welding portion and a second pole tab connecting portion, the second pole tab connecting portion connects the second main body and the second pole tab welding portion, the second pole tab welding portion is bent relative to the second pole tab connecting portion and covers the connecting sheet, and the protective sheet is welded to the second pole tab welding portion.

[0022] In a possible implementation, the protection sheet includes a first sheet body, the first sheet body is welded to the first tab welding portion, and / or the first sheet body is welded to the second tab welding portion.

[0023] In one possible implementation, the protective sheet also includes a bend and a second sheet, the bend is connected to the first sheet and the second sheet, the first tab welding portion is clamped between the first sheet and the second sheet, and / or the second tab welding portion is clamped between the first sheet and the second sheet.

[0024] In one possible implementation, the first tab includes a third tab connection portion, the third tab connection portion is connected to the first body, and the top of the third tab connection portion is not higher than the surface of the connecting piece away from the first body; and / or, the second tab includes a fourth tab connection portion, the fourth tab connection portion is connected to the second body, and the top of the fourth tab connection portion is not higher than the surface of the connecting piece away from the second body.

[0025] In one possible implementation, the protective sheet includes a first connecting portion and a first covering portion, the first connecting portion is connected to the third pole tab connecting portion, the first covering portion is bent relative to the first connecting portion and covers the connecting sheet, and / or the first connecting portion is connected to the fourth pole tab connecting portion, the first covering portion is bent relative to the first connecting portion and covers the connecting sheet.

[0026] In one possible implementation, the protective sheet further includes a second connecting portion and a second covering portion, the second connecting portion is arranged parallel to the first connecting portion, the second covering portion is arranged parallel to the first covering portion, the first connecting portion and the second connecting portion are connected to both sides of the third pole tab connecting portion, the first covering portion and the second covering portion cover the connecting sheet, and / or the first connecting portion and the second connecting portion are connected to both sides of the fourth pole tab connecting portion, the first covering portion and the second covering portion cover the connecting sheet.

[0027] In one possible implementation, the distance from the center of the pole to the center of the first tab or the second tab is T, the thickness of the first battery cell unit or the second battery cell unit is W, and the thickness of the adapter structure is Z. Then, the range of T satisfies the relationship:

[0028] 1 / 2Z≤T≤W.

[0029] In one possible implementation, the thickness Z of the transition structure satisfies the relationship:

[0030] 0.2mm≤Z≤2mm.

[0031] In one possible implementation, the thickness of the connecting piece is W2, and W2 satisfies the relationship:

[0032] 0.5Z≤W2≤0.9Z.

[0033] In one possible implementation, the first tab or the second tab is welded to the connecting piece, the depth of the welding point into the connecting piece is h1, the thickness of the connecting piece is W2, and h1 and W2 satisfy the relationship:

[0034] 5%≤h1 / W2≤95%.

[0035] In one possible implementation, the thickness of the first electrode tab or the second electrode tab is h2, the thickness of the cover protective sheet is W1, h2 satisfies the relationship: 0.2 mm ≤ h2 ≤ 1.5 mm, and W1 satisfies the relationship: 0.2 mm ≤ W1 ≤ 1.8 mm.

[0036] A second aspect of the present application provides a battery, comprising:

[0037] a housing having a receiving cavity;

[0038] And the battery cell module described in the first aspect, the battery cell module is accommodated in the accommodating cavity.

[0039] The battery in the embodiment of the present application can achieve the purpose of reducing the space occupied by the tabs inside the battery, thereby improving the energy density of the battery, and at the same time can also improve the welding yield between the tabs and the connecting pieces. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] To more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0041] Figure 1 A schematic structural diagram of a battery provided according to an embodiment of the present application is shown;

[0042] Figure 2 A schematic structural diagram of a battery cell module provided according to an embodiment of the present application is shown;

[0043] Figure 3 A schematic diagram of an explosion of a battery cell module provided according to an embodiment of the present application is shown;

[0044] Figure 4A partial cross-sectional view of a battery cell module provided according to an embodiment of the present application is shown;

[0045] Figure 5 shows an exploded schematic diagram of another battery cell module provided according to an embodiment of the present application;

[0046] Figure 6 shows an exploded schematic diagram of another battery cell module provided according to an embodiment of the present application;

[0047] Figure 7 Shows a dimensional relationship design diagram provided according to the first embodiment of the present application;

[0048] Figure 8 Another dimension relationship design diagram provided according to the first embodiment of the present application is shown;

[0049] Figure 9 A schematic structural diagram of a wrapping protection sheet provided according to the second embodiment of the present application is shown;

[0050] Figure 10 A schematic diagram of a welding method provided according to the second embodiment of the present application is shown;

[0051] Figure 11 A schematic diagram of another welding method provided according to the second embodiment of the present application is shown;

[0052] Figure 12 A schematic structural diagram of a protective sheet provided according to the third embodiment of the present application is shown;

[0053] Figure 13 A schematic diagram showing the connection between the protection sheet and the first electrode tab provided according to the third embodiment of the present application is shown;

[0054] Figure 14 A schematic structural diagram of a protective sheet provided according to the fourth embodiment of the present application is shown;

[0055] Figure 15 A schematic diagram of the connection between the protection sheet and the first electrode tab provided according to the fourth embodiment of the present application is shown.

[0056] Reference numerals:

[0057] 100 - first battery cell unit; 110 - first body; 120 - first tab structure; 121 - first tab; 122 - covering protective sheet; 123 - wrapping protective sheet; 1211 - first tab welding portion; 1212 - first tab connecting portion; 1213 - third tab connecting portion; 1221 - first sheet; 1222 - bend; 1223 - second sheet; 1224 - first connecting portion; 1225 - first covering portion; 1226 - second connecting portion; 1227 - second covering portion;

[0058] 200 - second battery cell unit; 210 - second body; 220 - second tab structure; 221 - second tab; 2211 - second tab welding portion; 2212 - second tab connection portion; 2213 - fourth tab connection portion;

[0059] 300-Transfer structure; 310-Connecting piece; 320-Insulating piece;

[0060] 10-battery; 11-housing; 12-cell module; 13-pole; 11a-accommodation cavity; 11b-accommodation space; 12a-installation area. DETAILED DESCRIPTION

[0061] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0062] Lithium batteries offer advantages such as environmental friendliness, high energy density, and long cycle life. With the rapid development of new energy technologies, lithium batteries are becoming increasingly important. Currently, lithium batteries are widely used in portable electronic devices, electric vehicles, electric scooters, and other fields. As users' performance and requirements for these products continue to escalate, lithium batteries face greater challenges in terms of capacity and charge rate. As lithium batteries are designed to be larger and their energy density is increasing.

[0063] High-energy-density lithium batteries typically consist of at least two cell units, which form a battery when electrically connected and incorporated into a housing. Each cell unit has tabs at its ends, which are connected by welding the tabs together (typically). Once the connected cells are installed in the housing, the tabs connect to certain parts of the housing, forming the poles. To prevent short circuits between the tabs and the housing, an insulating structure can be provided around the tabs.

[0064] For the battery cells and batteries with the above-mentioned structural shapes, in order to achieve the connection between different battery cells and the assembly of the batteries, it is often necessary to use the butterfly welding method, that is, welding first and then combining the cores, wherein combining the cores means stacking and merging two or more battery cells together. For the butterfly welding method, the process can be roughly referred to as follows: first, lay the two battery cells flat on the work surface, and the ends of the two battery cells with the tabs are arranged opposite to each other, and the tabs of the two battery cells extend toward each other. After sorting out the position and posture of the tabs, the two sets of tabs are connected together by welding, and then the two battery cells are flipped (generally flipped 90°) so that the two battery cells can fit together.

[0065] In the above process, it is not difficult to find that in order to achieve smooth flipping of the battery cell unit, the tab needs to have a certain length. For example, it is necessary to ensure that there is sufficient length between the root of the tab and the welding position, thereby providing enough space for the flipping action.

[0066] It is understandable that based on the above-mentioned shape of the battery cell units and batteries and the welding method of the tabs between different battery cell units, the shell needs to reserve more space for the tabs of the battery cell units. This results in the tabs occupying more of the top space of the shell after the battery cell module is assembled into the shell, which is not conducive to the compact design of the battery. The effective space of the battery cell unit does not account for a high proportion, which affects the energy density of the battery. Under the condition of a certain shell size, it is not conducive to the formation of a high-energy-density battery.

[0067] Currently, in the related art, connecting pieces are also provided to achieve welding of the tabs of different battery cell units. However, this method is prone to the occurrence of welding explosion points, resulting in a low welding yield.

[0068] In response to the above status quo and problems, an embodiment of the present application provides a battery having a specific structure that is different from traditional batteries. By rationally designing the connection structure between the tabs of different battery cells, the purpose of reducing the space occupied by the tabs inside the battery can be achieved, thereby improving the energy density of the battery and at the same time improving the welding yield between the tabs and the connecting pieces.

[0069] On the basis of the above, the embodiment of the present application can also make the following design for the pole: In the embodiment of the present application, the pole is directly integrated on the battery cell module, for example, it can be designed at one end of the battery cell module, and the pole protrudes from the end of the battery cell module. The pole ear part of the battery cell module can be connected to the pole by means of outer covering, and then combined with the design of the corresponding insulation structure (such as the insulating sheet 320 in the following embodiment), the connection between the pole and the pole ear part can be achieved, and short circuit can also be prevented at the same time.

[0070] The covering design of the pole and the tab allows the tab to be located around the pole. After the cell module is placed in a shell to form a battery, the tab can be accommodated in the space formed by the shell and the pole, thereby improving the space utilization rate of the battery and the effective space ratio of the cell module, thereby achieving the purpose of forming a battery with higher energy density under the condition of a certain shell size.

[0071] Figure 1 A schematic structural diagram of a battery provided according to an embodiment of the present application is shown; Figure 2 The schematic diagram of the structure of a battery module provided in accordance with the embodiment of the present application is shown. Figure 1 and Figure 2 The battery 10 includes a housing 11 and a cell module 12 .

[0072] The housing 11 serves as a protective casing for the battery 10 and can be made of a high-strength material, such as aluminum or an aluminum alloy. The housing 11 can be designed in a square or cylindrical shape. The housing 11 defines a receiving cavity 11a within which the battery module 12 can be received.

[0073] The housing 11 can be designed with an open end, which can communicate with the receiving cavity 11a. After the cell module 12 is installed in the receiving cavity 11a, the battery 10 can be encapsulated using a capping process. When using a housing 11 with an open end, the cell module 12 can be installed in the housing 11 in a normal manner, that is, the cell module 12 is installed into the housing 11 from the open end, and then the open end of the housing 11 is sealed. In the above-mentioned housing structure, the open end is located at the upper end of the housing 11.

[0074] In other cases, the housing 11 may also be designed with an open lower end and a through-hole at the upper end, wherein both the opening and the through-hole are connected to the receiving cavity 11a. When the housing 11 adopts this structure, the cell module 12 can be installed into the housing 11 in a flip-down manner, that is, the cell module 12 is installed into the housing 11 from the lower opening, and the opening is sealed, so that the pole 13 can extend from the through-hole. Then, a suitable sealing and insulating structure with sealing and insulating properties can be designed around the pole 13.

[0075] The battery module 12 includes at least two battery cells, and the at least two battery cells together form a positive electrode column and a negative electrode column. The positive electrode column can extend from the shell 11 to form the positive electrode of the battery 10, and the negative electrode column can extend from the shell 11 to form the negative electrode of the battery 10.

[0076] In the embodiment of the present application, for ease of understanding and simplified description, the battery cell module 12 is described as including two battery cell units. It is understandable that in other embodiments, the battery cell module 12 may also include three battery cell units, four battery cell units, or more battery cell units.

[0077] In the embodiments of the present application, for ease of understanding and simplified description, the following embodiments will take the positive electrode column as an example to describe the peripheral design of the positive electrode column, the battery cell module, and the battery, and the related design of the negative electrode column can be designed with reference to the positive electrode column. It should be noted that the above-mentioned peripheral design mainly includes the tab portion and the connection structure between the tab portion and the electrode 13. The following embodiments will describe various tab portions and the connection structures between the tab portion and the electrode column. It can be understood that when designing the negative electrode column with reference to the positive electrode column, the negative electrode column can be selected from one of the above-mentioned multiple structures, and the peripheral design of the negative electrode column can be the same as or different from that of the positive electrode column.

[0078] In addition, in the following description, some descriptions will directly use the pole 13. It should be understood that the pole 13 here can be a positive pole or a negative pole.

[0079] In the battery 10 in the embodiment of the present application, the pole 13 is directly formed on the battery module 12. After the battery module 12 is installed in the shell 11, a receiving space 11b will be formed between the pole 13 and the shell 11. The pole ear part of the battery module 12 (for example, the first pole ear structure 120 and the second pole ear structure 220 in the following embodiments) can be accommodated in the receiving space 11b, making the structure of the battery 10 more compact, and can improve the space rate of the battery 10, increase the effective space ratio of the battery module 12, and achieve the purpose of forming a battery 10 with a higher energy density under the condition that the size of the shell 11 is certain.

[0080] Figure 3 A schematic diagram of an explosion of a battery cell module provided according to an embodiment of the present application is shown; Figure 4 A partial cross-sectional view of a battery cell module provided according to an embodiment of the present application is shown. In the embodiment of the present application, please refer to Figures 2 to 4 The battery cell module 12 includes a first battery cell unit 100 , a second battery cell unit 200 and a transfer structure 300 .

[0081] The first battery cell unit 100 includes a first tab structure 120, which includes a first tab 121. The first battery cell unit 100 is provided with a first body 110, which is the portion of the first battery cell unit 100 excluding the first tab structure 120. It can be understood that the first battery cell unit 100 includes a first positive electrode sheet, a first separator, and a first negative electrode sheet. A first positive tab is formed on the first positive electrode sheet, and a first negative tab is formed on the first negative electrode sheet. The first positive electrode sheet, the first separator, and the first negative electrode sheet can be stacked to form a laminated battery cell. The first positive electrode tabs are stacked together to form a first positive electrode tab group, and the first negative electrode tabs are stacked together to form a first negative electrode tab group. The first positive electrode tab group or the first negative electrode tab group can be understood as the first tab structure 120. The first positive electrode sheet, the first separator, and the first negative electrode sheet are stacked to form the first body 110. The first positive electrode sheet, the first separator and the first negative electrode sheet can also be wound to form a wound battery cell. The first positive electrode tabs are wound together to form a first positive electrode tab group, and the first negative electrode tabs are wound together to form a first negative electrode tab group. The first positive electrode tab group or the first negative electrode tab group can be understood as a first tab structure 120. The first positive electrode sheet, the first separator and the first negative electrode sheet are wound to form a first main body 110.

[0082] The second battery cell unit 200 includes a second tab structure 220, which includes a second tab 221. The second battery cell unit 200 is provided with a second body 210, the second body 210 and the second tab structure 220 disposed on the second body 210. The structure of the second battery cell unit 200 can be referred to the first battery cell unit 100 described above and will not be repeated here.

[0083] The first battery cell unit 100 and the second battery cell unit 200 can be stacked or wound to form a square structure, and other structures are also possible. In the following embodiments of this application, unless otherwise specified, the first battery cell unit 100 and the second battery cell unit 200 are both designed as a square structure. Furthermore, the square structure can be flat, with a pair of large, opposing flat surfaces.

[0084] It can be understood that, as a battery cell module 12, the first battery cell unit 100 and the second battery cell unit 200 can be arranged side by side, for example, the large plane in the first battery cell unit 100 and the large plane in the second battery cell unit 200 are opposite to each other, and the first pole tab structure 120 and the second pole tab structure 220 are located at the same end of the battery cell module 12, so that the first pole tab structure 120, the second pole tab structure 220, the first main body 110 and the second main body 210 can form an installation area 12a.

[0085] It can be understood that after the first battery cell unit 100 and the second battery cell unit 200 are arranged side by side and form the aforementioned mounting area 12a, the connection between the first battery cell unit 100 and the second battery cell unit 200 can be realized by arranging the adapter structure 300 in the mounting area 12a, and therefore the adapter structure 300 serves as a transition structure between the first battery cell unit 100 and the second battery cell unit 200. By reasonably designing the structural features of the adapter structure 300 and the connection structure of the first tab structure 120, the second tab structure 220 and the adapter structure 300, the purpose of reducing the space occupied by the first tab structure 120 and the second tab structure 220 on the basis of stably connecting the first battery cell unit 100 and the second battery cell unit 200 can be achieved.

[0086] The adapter structure 300 is arranged in the aforementioned mounting area 12a, and the adapter structure 300 is connected to the first body 110 and the second body 210. The adapter structure 300 includes a connecting sheet 310, the first tab structure 120 is connected to the first side of the connecting sheet 310 and covers the connecting sheet 310, and the second tab structure 220 is connected to the second side of the connecting sheet 310 and covers the connecting sheet 310.

[0087] In order to achieve stable connection, the connecting sheet 310 in the adapter structure 300 can provide sufficient connection area. For example, the adapter structure 300 can be connected to the first body 110 and the second body 210, and this connection mode can be realized by face contact, that is, the adapter structure 300 is connected to the first body 110 and the second body 210 by face contact. For another example, the first tab structure 120 and the second tab structure 220 can also be connected to the adapter structure 300 by face contact, respectively. The first tab structure 120 covers the first side of the connecting sheet 310, and the second tab structure 220 covers the second side of the connecting sheet 310. Therefore, the arrangement of the connecting sheet 310 in the adapter structure 300 can improve the connection reliability between the adapter structure 300 and the first body 110 and the second body 210, and also improve the connection reliability between the first tab structure 120 and the second tab structure 220 and the connecting sheet 310.

[0088] On the other hand, the pole 13 can be directly formed on the connecting sheet 310, and the first tab structure 120 and the second tab structure 220 are both covered on the connecting sheet 310 and wrapped around the outer periphery of the pole 13. This covering design can make full use of the vertical space above the pole 13, and this wrapping design can make full use of the horizontal space of the pole 13, and the combination of the two can greatly reduce the space occupied by the first tab structure 120 and the second tab structure 220.

[0089] In the above description, it should be noted that the connecting piece 310 can be designed as a sheet-like structure and can be designed according to the end structure of the battery module 12. For example, when the end structure of the battery module 12 is a plane, the connecting piece 310 can be a planar structure, and the pole 13 can be formed at any position of the planar structure. However, in order to leave the first side and the second side of the connecting piece 310, the pole 13 can be set at the center of the connecting piece 310. It can be understood that in the above description, the first side refers to the side of the connecting piece 310 close to the first battery cell unit 100, and the second side refers to the side of the connecting piece 310 close to the second battery cell unit 200, and the first side and the second side are respectively located on both sides of the pole 13.

[0090] In the above description, please refer to Figure 4 ,by Figure 4 Taking the orientation shown as an example, the above-mentioned horizontal space refers to the space along the X direction, that is, the space expanding outward from the position of the pole 13 in the X direction, and the above-mentioned vertical space refers to the space along the Z direction, that is, the space expanding outward from the position of the pole 13 in the Z direction.

[0091] In some embodiments, the first tab structure 120 includes a protective sheet, and the protective sheet and the first tab 121 are welded to the connecting sheet 310 or the protective sheet is welded to the connecting sheet 310.

[0092] And / or, the second electrode tab structure 220 includes a protection sheet, and the protection sheet and the second electrode tab 221 are welded to the connecting sheet 310 or the protection sheet is welded to the connecting sheet 310 .

[0093] Here, the protective sheet is provided and welded to improve the welding strength between the first electrode tab 121 and the connecting tab 310. This is because the protective sheet can play a compressive role during the welding process, so that the first electrode tab 121 and the connecting tab 310 can be stably connected. The second electrode tab 221 also has the same effect, which will not be described in detail.

[0094] In the embodiment of the present application, the first pole ear structure 120 and the second pole ear structure 220 can both cover and be connected to the connecting piece 310, which can reduce the space occupied by the first pole ear structure 120 and the second pole ear structure 220. After the battery cell module 12 is installed in the outer shell 11, the effective space share of the battery cell module 12 can be increased, which is beneficial to improving the energy density of the battery 10. At the same time, the setting of the protective sheet can improve the welding yield, thereby improving the battery yield.

[0095] In an embodiment in which the pole 13 is integrated on the connecting piece 310, by arranging the adapter structure 300 in the installation area 12a surrounded by the first pole lug structure 120, the second pole lug structure 220, the first main body 110 and the second main body 210, the adapter structure 300 can connect the first pole lug structure 120 and the second pole lug structure 220 based on the structural design of the connecting piece 310, thereby realizing conduction between the first battery cell unit 100 and the second battery cell unit 200, and can form a reliable connection between the first main body 110, the second main body 210, the first pole lug structure 120 and the second pole lug structure 220. The pole 13 is formed on the connecting piece 310, the first pole ear structure 120 covers the first side of the connecting piece 310, and the second pole ear structure 220 covers and is connected to the second side of the connecting piece 310. The first pole ear structure 120 and the second pole ear structure 220 can make full use of the vertical space and the horizontal space of the pole 13, and can greatly reduce the space occupied by the first pole ear structure 120 and the second pole ear structure 220. After the battery cell module 12 is installed in the shell 11, the effective space share of the battery cell module 12 can be increased, which is beneficial to improving the energy density of the battery 10.

[0096] In some embodiments, the first battery cell unit 100 and the second battery cell unit 200 can be arranged in a close-fitting manner. Even if the large surface of the first battery cell unit 100 and the large surface of the second battery cell unit 200 are in close contact with each other, this close-fitting design can make the battery cell module 12 more compact. In some possible embodiments, the first battery cell unit 100 and the second battery cell unit 200 can also be separated by a certain distance, and then relevant functional structures can be arranged within this distance. The functional structure can be a heat dissipation structure for heat dissipation or a connection structure for connection. In the embodiments of the present application, in order to simplify the description, the first battery cell unit 100 and the second battery cell unit 200 are mainly arranged in a close-fitting manner as an example for explanation.

[0097] Figure 5 shows an exploded schematic diagram of another battery cell module provided according to an embodiment of the present application; Figure 6 A schematic diagram of an explosion of another battery cell module provided according to an embodiment of the present application is shown.

[0098] In some embodiments, please refer to Figures 3 to 5 The first body 110 and the second body 210 are at the same height, the first tab structure 120 and the second tab structure 220 are at the same height, and the first tab structure 120 and the second tab structure 220 are arranged opposite to each other.

[0099] It should be noted that the first body 110 and the second body 210 are three-dimensional structures. Figure 3The coordinate system shown is an example, the first body 110 and the second body 210 are in the same height, which means that the first body 110 and the second body 210 have the same size in the Z direction and the ends of the two are flush, and similarly, the first tab structure 120 and the second tab structure 220 are in the same height, which means that the first tab structure 120 and the second tab structure 220 have the same size in the Z direction and the ends of the two are flush. When the first body 110 and the second body 210 are attached, the first tab structure 120 and the second tab structure 220 can form a relative positional relationship.

[0100] In the above embodiment, the battery cell module 12 can be designed as a regular structure, the first tab structure 120 and the second tab structure 220 are in a relative positional relationship, the ends of the first body 110 and the second body 210 are flush, so that the mounting area 12a can be designed as a cuboid structure or substantially a cuboid structure, thereby reducing the structure composition, manufacturing difficulty and assembly difficulty of the adapter structure 300.

[0101] Specifically, please refer to Figure 3 and Figure 4 , the first tab structure 120 is located at the upper end of the first body 110, the second tab structure 220 is located at the upper end of the second body 210, the first tab structure 120 and the second tab structure 220 are oppositely arranged, the mounting area 12a is in a cuboid structure, the first tab structure 120 and the second tab structure 220 are limited on the left side and the right side of the mounting area 12a, the first tab structure 120 and the second tab structure 220 have the same size in the X direction, the Y direction and the Z direction, the connecting piece 310 is arranged in the mounting area 12a, the connecting piece 310 is designed as a planar structure and a cuboid sheet structure, the connecting piece 310 can be attached to the first body 110 and the second body 210, and the first tab structure 120 and the second tab structure 220 cover the upper side of the connecting piece 310.

[0102] In the above description, up and down are the orientation description in the Z direction, that is, the Z direction can define the upper end and the lower end, or the upper side or the lower side; left and right are the orientation description in the X direction, that is, the X direction can define the left end and the right end, or the left side and the right side; front and back are the orientation description in the Y direction, that is, the Y direction can define the front end and the back end, or the front side and the back side. In different embodiments, the specific direction and meaning of the above orientation can be correctly understood according to the coordinate system.

[0103] In other embodiments, please refer to Figure 5 and Figure 6 , the first body 110 and the second body 210 are in the same height, the first tab structure 120 and the second tab structure 220 are in the same height, and the first tab structure 120 and the second tab structure 220 are arranged staggered.

[0104] For ease of description, Figure 5 and Figure 6 Taking the coordinate system shown in as an example, the first body 110 and the second body 210 being of equal height means that the first body 110 and the second body 210 have the same size in the Z direction and their ends are flush. Similarly, the first tab structure 120 and the second tab structure 220 being of equal height means that the first tab structure 120 and the second tab structure 220 have the same size in the Z direction and their ends are flush. When the first body 110 and the second body 210 are arranged in close proximity, the first tab structure 120 and the second tab structure 220 can form a staggered positional relationship.

[0105] The staggered arrangement here means that the first tab structure 120 and the second tab structure 220 are located at different positions in the Y direction, and the two tab structures are spaced a certain distance apart in the Y direction. Figure 5 In the example shown, the first tab structure 120 and the second tab structure 220 are separated by a relatively long distance. Figure 6 In the example shown, the first tab structure 120 and the second tab structure 220 are separated by a relatively short distance.

[0106] In the above embodiment, the battery cell module 12 as a whole can be designed into a regular structure. Based on the staggered arrangement of the first pole ear structure 120 and the second pole ear structure 220, the size of the installation area 12a can be designed to be larger, thereby enabling the size of the transfer structure 300 to be lengthened, which can be beneficial to the design of the insulation structure and avoid short circuit between the first battery cell unit 100 and the second battery cell unit 200.

[0107] Specifically, please refer to Figure 3 、 Figure 5 and Figure 6 The first tab structure 120 is located at the upper end of the first body 110, and the second tab structure 220 is located at the upper end of the second body 210. The first tab structure 120 and the second tab structure 220 are staggered in the Y direction, and the installation area 12a is a parallelogram structure. The first tab structure 120 and the second tab structure 220 are limited to the left and right sides of the installation area 12a. The first tab structure 120 and the second tab structure 220 have the same size in the X direction, the Y direction and the Z direction. The connecting piece 310 is arranged in the installation area 12a. The connecting piece 310 is designed to be a planar structure and has a Z-shaped sheet structure. The connecting piece 310 can be attached to the first body 110 and the second body 210. The first tab structure 120 and the second tab structure 220 cover the upper side of the connecting piece 310.

[0108] In some other embodiments, the first body 110 and the second body 210 are not at the same height, and the first tab structure 120 and the second tab structure 220 are not at the same height.

[0109] The unequal heights can be understood with reference to the previous embodiments. The unequal heights here mean that the first body 110 and the second body 210 have different sizes in the Z direction. For example, when one end of the first body 110 and one end of the second body 210 are flush, the other end of the first body 110 and the other end of the second body 210 are in a high and low state, so that the first tab structure 120 and the second tab structure 220 are also unequal in height.

[0110] The unequal height design solution enables the battery cell module 12 to be configured with different battery cell units, such as a first battery cell unit 100 with high energy density and a second battery cell unit 200 with low energy density. The battery cell module 12 formed by this design can have a higher energy density.

[0111] Correspondingly, for designs with unequal heights, the connecting piece 310 can also be changed accordingly, for example, by transforming the aforementioned planar structure into a bent structure. This connecting piece 310 can have a portion attached to the first battery cell unit 100, and the other portion attached to the second battery cell unit 200 by bending.

[0112] Furthermore, based on some of the other embodiments above, the first tab structure 120 and the second tab structure 220 may also be staggered. The structural changes and principles thereof may refer to the above embodiments and will not be described in detail.

[0113] It can be seen that the above embodiments involve three types of battery cell modules 12. The first type is a design with equal heights and the first tab structure 120 and the second tab structure 220 are arranged opposite to each other. Figure 3 The second is a case where the first tab structure 120 and the second tab structure 220 are staggered, as shown in FIG. Figure 5 and Figure 6 As shown; the third is an unequal height design, which includes relative settings and staggered settings. In the above three structural compositions, it can be understood that the role of the connecting piece 310 is to connect the first battery cell unit 100 and the second battery cell unit 200, and it is also necessary to establish an electrical connection between the first battery cell unit 100 and the second battery cell unit 200. Therefore, the connecting piece 310 can be made of a material with conductive function and high strength, such as aluminum, copper, nickel, etc. In order to prevent short circuits during the conduction process, the connecting piece 310 also needs to be configured with the insulating structure mentioned in the above description.

[0114] Based on this, in some embodiments, please refer to Figure 3 , Figure 5 and Figure 6The transfer structure 300 further includes an insulating sheet 320 , which is disposed between the connecting sheet 310 and the first body 110 and between the connecting sheet 310 and the second body 210 .

[0115] In combination with the foregoing, the connecting piece 310 needs to be connected to the first main body 110 and the second main body 210 at the same time. Here, setting the insulating piece 320 between the connecting piece 310 and the first main body 110 and setting the insulating piece 320 between the connecting piece 310 and the second main body 210 can play a good insulating role, preventing a short circuit from forming between the first battery cell unit 100 and the second battery cell unit 200, and also preventing the diaphragm of the battery cell module 12 from being burned during welding.

[0116] The insulating sheet 320 can have a sheet-like structure, and its specific structure can be adapted to the shape of the connecting sheet 310. For example, the insulating sheet 320 can be designed as a planar structure with a rectangular sheet structure, or a planar structure with a Z-shaped sheet structure. The insulating sheet 320 can also have a film-like structure. The film-like insulating sheet 320 can well adapt to the shape of the connecting sheet 310 and can be adjusted to different connecting sheets 310, and can be used in the third type of battery cell module 12 described above.

[0117] The insulating sheet 320 can be made of plastic material or polymer material with insulating properties, such as rubber, silicone, etc.

[0118] In some embodiments, the insulating sheet 320 and the connecting sheet 310 can be integrally formed to simplify the assembly of the adapter structure 300. In some embodiments, the insulating sheet 320 and the connecting sheet 310 can also be manufactured separately to reduce the difficulty of manufacturing the insulating sheet 320 and the connecting sheet 310.

[0119] In some embodiments, the area of ​​the insulating sheet 320 may be larger than the area of ​​the connecting sheet 310 , which can improve the insulation effect while ensuring a stable connection between the connecting sheet 310 and the insulating sheet 320 .

[0120] In addition, in order to improve the insulation effect, the insulating sheet 320 can be used to cover the connecting sheet 310, for example, Figure 3 In the example shown, the two sides of the insulating sheet 320 can be designed to be longer so that the insulating sheet 320 can be folded over and cover the left and right sides of the connecting sheet 310 .

[0121] It can be known from the above embodiments that the tab part in the embodiment of the application needs to be covered on the connecting piece 310, therefore, the first tab structure 120 and the second tab structure 220 can be designed as a bending structure. In the following embodiments, four types of structure compositions related to the tab part will be mainly introduced, it can be understood that in the following four types of structures, different assembly modes can be adopted to assemble the battery cell module 12, various assembly modes will be described together in the embodiments, in addition, in order to ensure that the battery cell module 12 has excellent comprehensive performance, the design of related detail features of the battery cell module 12 will also be described, the design of these detail features mainly focuses on the design of the size of each component part.

[0122] In the first type of embodiment, please refer to Figure 3 and Figure 4 , the first tab structure 120 includes the first tab 121, and the first tab 121 is covered on the connecting piece 310, the second tab structure 220 includes the second tab 221, and the second tab 221 is covered on the connecting piece 310.

[0123] The first tab 121 can be the inherent component part of the first battery cell unit 100, and its function is to collect the current in the first battery cell unit 100, the second tab 221 can be the inherent component part of the second battery cell unit 200, and its function is to collect the current in the second battery cell unit 200.

[0124] In the first type of embodiment, the first tab 121 and the second tab 221 can be designed as a bending structure, taking the first tab 121 as an example, it can be bent to the left side along the X direction from the upper end of the first main body 110 and thus covered on the connecting piece 310.

[0125] Specifically, please refer to Figure 4 , the first tab 121 includes the first tab welding part 1211 and the first tab connecting part 1212, the first tab connecting part 1212 connects the first main body 110 and the first tab welding part 1211, the first tab welding part 1211 is bent relative to the first tab connecting part 1212 and covered on the connecting piece 310, and the protection piece is welded on the first tab welding part 1211; and / or, the second tab 221 includes the second tab welding part 2211 and the second tab connecting part 2212, the second tab connecting part 2212 connects the second main body 210 and the second tab welding part 2211, the second tab welding part 2211 is bent relative to the second tab connecting part 2212 and covered on the connecting piece 310, and the protection piece is welded on the second tab welding part 2211.

[0126] In order to improve the connection strength between the first electrode tab 121 and the connecting piece 310 and the connection strength between the second electrode tab 221 and the connecting piece 310, a covering protective sheet 122 can be provided on the first electrode tab 121 and the second electrode tab 221. The covering protective sheet 122 can cover the first electrode tab 121 and the second electrode tab 221.

[0127] Specifically, please refer to Figure 3 and Figure 4 As one of the above-mentioned protective sheets, the covering protective sheet 122 may include a first sheet 1221 , the first sheet 1221 being welded on the first tab welding portion 1211 , and / or the first sheet 1221 being welded on the second tab welding portion 2211 .

[0128] The covering protective sheet 122 can be made of insulating hard plastic, which can form pressure on the first pole ear 121 and the second pole ear 221, so that the first pole ear 121 and the second pole ear 221 are stably connected to the connecting piece 310; the covering protective sheet 122 can also be made of metal material. In this case, an insulating structure can be added between the covering protective sheet 122 and the outer shell 11 of the battery 10 to avoid directing current to the outer shell 11.

[0129] In this first type of embodiment, reference may be made to Figure 4 Taking the second electrode tab 221 as an example, the distance from the center of the electrode column 13 to the center of the second electrode tab 221 is T, the thickness of the first battery cell unit 100 or the second battery cell unit 200 is W, and the thickness of the adapter structure 300 is Z. Then the range of T can satisfy the relationship:

[0130] 1 / 2Z≤T≤W.

[0131] The above-mentioned dimensional relationship can reasonably configure the size ratio of the battery cell module 12 and balance the thickness ratio of the adapter structure 300 and the battery cell module 12, so that the battery cell module 12 has sufficient strength and comprehensive performance.

[0132] In the above description, please refer to Figure 4 The center of the second tab 221 refers to the center of the second tab connecting portion 2212 along the X direction.

[0133] Figure 7 Shows a dimensional relationship design diagram provided according to the first embodiment of the present application; Figure 8 Another dimensional relationship design diagram provided according to the first embodiment of the present application is shown.

[0134] In some embodiments, please refer to Figure 7 and Figure 8The thickness Z of the adapter structure 300 can satisfy the relationship: 0.2mm≤Z≤2mm, and the thickness W2 of the connecting piece 310 can satisfy the relationship: 0.5Z≤W2≤0.9Z.

[0135] The design can reasonably configure the thickness ratio of the adapter structure 300, so that the adapter structure 300 can reduce the overall thickness of the adapter structure 300 on the basis of having sufficient strength, thereby reducing the space occupied by the adapter structure 300 and the tab portion.

[0136] In some embodiments, referring to Figure 7 and Figure 8 The thickness h2 of the first tab 121 or the second tab 221 can satisfy the relationship: 0.2mm≤h2≤1.5mm, and the thickness W1 of the covering protection sheet 122 can satisfy the relationship: 0.2mm≤W1≤1.8mm.

[0137] The design can reasonably configure the thickness relationship between the tab portion and the covering protection sheet 122, so that the tab portion can be stably connected to the connecting piece 310.

[0138] In the first type of embodiment, the adapter structure 300 can be placed to the first body 110 and the second body 210, the first tab 121 and the second tab 221 can be connected to the connecting piece 310 by welding, and the covering protection sheet 122 can also be connected to the first tab 121 and the second tab 221 by welding.

[0139] When assembling the battery cell module 12, the following scheme can be adopted: after the first battery cell unit 100 and the second battery cell unit 200 are combined together, the first tab 121 and the second tab 221 are bent in directions away from each other to leave an installation area 12a, then the connecting piece 310 is placed in the installation area 12a (when the adapter structure 300 includes the insulating sheet 320, the connecting piece 310 and the insulating sheet 320 need to be placed in the installation area 12a), then the first tab 121 and the second tab 221 are bent back in directions toward each other so that the first tab 121 and the second tab 221 can be welded and covered on the connecting piece 310, and then the covering protection sheet 122 is welded to the first tab 121 and the second tab 221.

[0140] In the above solution, two welding processes are required to realize the connection between the adapter structure 300, the first electrode tab 121 (or the second electrode tab 221), and the cover protection sheet 122. It is understandable that the connection between the cover protection sheet 122, the first electrode tab 121 (or the second electrode tab 221), and the adapter structure 300 can also be realized by one-time welding, that is, after the positions of the adapter structure 300, the first electrode tab 121, and the cover protection sheet 122 are aligned, they are connected together by laser welding. Please refer to Figure 8 One-time welding can be achieved, for example, by laser welding, where the welding area is S3.

[0141] For the first battery cell unit 100 and the second battery cell unit 200, the first pole tab 121 and the second pole tab 221 are both group structures, that is, the first pole tab 121 includes multiple pole tab sheets, each pole tab sheet corresponds to a positive pole sheet (which can also be a negative pole sheet), and the second pole tab 221 also includes multiple pole tab sheets, each pole tab sheet corresponds to a positive pole sheet (which can also be a negative pole sheet). In the above solution, to improve the welding effect, the first pole tab 121 and the second pole tab 221 can be subjected to an ultrasonic welding process before welding to achieve the convergence of each pole tab sheet, with a welding area of ​​S4, and then the converged first pole tab 121 and the second pole tab 221 are welded to the connecting piece 310.

[0142] During the above assembly process, S3≤S4 can be achieved, which is beneficial to increasing the welding yield. During the welding process, the covering protective sheet 122 can press the first electrode tab 121 and the second electrode tab 221, which can reduce the risk of cracking of the first electrode tab 121 and the second electrode tab 221.

[0143] In some embodiments, please refer to Figure 7 and Figure 8 The effective penetration depth during welding (the depth of the welding point into the connecting piece 310) is h1, and the thickness of the connecting piece 310 is W2. The ratio range of h1 to W2 can satisfy: 5%≤h1 / W2≤95%.

[0144] The effective melting depth should not be too small. It is necessary to ensure the welding strength between the covering protection sheet 122 and the first pole ear 121 (or the second pole ear 221) to prevent the covering protection sheet 122 from moving freely and damaging the battery module 12. The effective melting depth should not be too large to avoid the laser damaging the diaphragm in the battery module 12 and causing a short circuit.

[0145] Exemplarily, the ratio range of h1 to W2 may satisfy: 50%≤h1 / W2≤95%.

[0146] In the second type of embodiment, the first tab structure 120 includes a first tab 121 which is covered on the connecting piece 310, and the second tab structure 220 includes a second tab 221 which is covered on the connecting piece 310. Different from the first type of embodiment, in the second type of embodiment, the covering protection piece 122 is replaced by a wrapping protection piece 123 which is wrapped on the first tab 121 and / or wrapped on the second tab 221.

[0147] Figure 9 A structure diagram of the wrapping protection piece according to the second type of embodiment of the present application is shown; Figure 10 A schematic diagram of a welding method according to the second type of embodiment of the present application is shown; Figure 11 Another schematic diagram of a welding method according to the second type of embodiment of the present application is shown.

[0148] In some embodiments, referring to Figure 9 As one of the above protection pieces, the wrapping protection piece 123 can further include a bending 1222 and a second piece 1223, the bending 1222 is connected to the first piece 1221 and the second piece 1223, the first tab welding part 1211 is clamped between the first piece 1221 and the second piece 1223, and / or the second tab welding part 2211 is clamped between the first piece 1221 and the second piece 1223.

[0149] The wrapping protection piece 123 can form a connecting surface on both sides of the first tab 121 and the second tab 221, so that the connection between the first tab 121, the wrapping protection piece 123 and the connecting piece 310 is more reliable. The first piece 1221 and the second piece 1223 of the wrapping protection piece 123 can be designed to be thinner than the first piece 1221 of the covering protection piece 122.

[0150] In some specific embodiments, after the wrapping protection piece 123 wraps the first tab 121 and the second tab 221, the area ratio of the first piece 1221 and the second piece 1223 can be large, for example, the area of the first piece 1221 and the second piece 1223 is half of the area of the first tab welding part of the first tab 121, thereby improving the connection strength and reliability.

[0151] In the second type of embodiment, the dimensions can be designed according to the first type of embodiment, which will not be repeated here.

[0152] It should be pointed out in particular that when assembling the battery module 12, the following solution can be adopted: after the first battery cell unit 100 and the second battery cell unit 200 are merged together, the first pole ear 121 and the second pole ear 221 are bent away from each other to make way for the installation area 12a, and then the connecting piece 310 is placed in the installation area 12a (when the adapter structure 300 includes an insulating sheet 320, the connecting piece 310 and the insulating sheet 320 need to be placed in the installation area 12a), and then the wrapping protective sheet 123 is welded to the first pole ear 121 and the second pole ear 221, and then the first pole ear 121 and the second pole ear 221 are folded back in the direction toward each other so that the first pole ear 121 and the second pole ear 221 can be welded and covered on the connecting piece 310.

[0153] Similar to the first embodiment, in the above solution, the welding between the wrapping protective sheet 123, the first tab 121 and the connecting sheet 310 can be performed by a laser welding process, such as Figure 11 As shown, after the positions of the wrapping protective sheet 123, the first electrode tab 121 and the connecting sheet 310 are correspondingly set, the welding process is performed; or an ultrasonic welding process can be first performed to achieve the convergence of the first electrode tab 121 and the second electrode tab 221, and then a laser welding process or two laser welding processes are performed to achieve the welding between the wrapping protective sheet 123, the first electrode tab 121 and the connecting sheet 310, as shown. Figure 10 shown.

[0154] Figure 12 A schematic structural diagram of a protective sheet provided according to the third embodiment of the present application is shown; Figure 13 A schematic diagram of the connection between the protection sheet and the first electrode tab provided according to the third embodiment of the present application is shown.

[0155] In the third embodiment, please refer to Figure 12 and Figure 13 The first pole tab 121 includes a third pole tab connection portion 1213, which is connected to the first body 110 and the top of the third pole tab connection portion 1213 is not higher than the surface of the connecting piece 310 away from the first body 110; and / or, the second pole tab 221 includes a fourth pole tab connection portion 2213, which is connected to the second body 210 and the top of the fourth pole tab connection portion 2213 is not higher than the surface of the connecting piece 310 away from the second body 210.

[0156] Different from the aforementioned first and second embodiments, in this third embodiment, the first electrode tab 121 and the second electrode tab 221 are designed with different structures, their lengths can be designed to be shorter, and the protective sheet can be directly connected to the connecting sheet 310.

[0157] In the third type of embodiment, the design requirements for the first electrode tab 121 and the second electrode tab 221 are reduced, and they can be designed to be shorter.

[0158] For details, please refer to Figure 12 The protective sheet includes a first connecting portion 1224 and a first covering portion 1225, the first connecting portion 1224 is connected to the third pole tab connecting portion 1213, the first covering portion 1225 is bent relative to the first connecting portion 1224 and covers the connecting sheet 310, and / or, the first connecting portion 1224 is connected to the fourth pole tab connecting portion 2213, the first covering portion 1225 is bent relative to the first connecting portion 1224 and covers the connecting sheet 310.

[0159] When assembling the battery cell module 12, the following solution can be adopted: after merging the first battery cell unit 100 and the second battery cell unit 200 together, weld the protective sheet to the first pole ear 121, weld the protective sheet to the second pole ear 221, and then install the adapter structure 300 into the installation area 12a, and then bend the protective sheet and weld it to the connecting sheet 310.

[0160] In the above solution, the protective sheet may be welded to the first electrode tab 121 and the protective sheet may be welded to the second electrode tab 221 before the first battery cell unit 100 and the second battery cell unit 200 are combined together.

[0161] When connected to the first tab 121, the first connecting portion 1224 can be welded to the third tab connecting portion 1213 of the first tab 121, and the first covering portion 1225 can be covered and connected to the connecting piece 310. Alternatively, the first connecting portion 1224 can be welded to the fourth tab connecting portion 2213 of the second tab 221, and the first covering portion 1225 can be covered and connected to the connecting piece 310.

[0162] In the third embodiment, the thickness of the protective sheet can be designed with reference to the sum of the thicknesses of the first tab 121 and the cover protective sheet 122 in the first embodiment, or can be designed to other thicknesses.

[0163] Figure 14 A schematic structural diagram of a protective sheet provided according to the fourth embodiment of the present application is shown; Figure 15 A schematic diagram of the connection between the protection sheet and the first electrode tab provided according to the fourth embodiment of the present application is shown.

[0164] Please refer to Figure 14 and Figure 15 , different from the aforementioned third embodiment, this fourth embodiment provides another protective sheet.

[0165] Specifically, the protective sheet also includes a second connecting portion 1226 and a second covering portion 1227, the second connecting portion 1226 is arranged parallel to the first connecting portion 1224, the second covering portion 1227 is arranged parallel to the first covering portion 1225, the first connecting portion 1224 and the second connecting portion 1226 are connected to both sides of the third pole ear connecting portion 1213, the first covering portion 1225 and the second covering portion 1227 cover the connecting sheet 310, and / or, the first connecting portion 1224 and the second connecting portion 1226 are connected to both sides of the fourth pole ear connecting portion 2213, the first covering portion 1225 and the second covering portion 1227 cover the connecting sheet 310.

[0166] In the fourth embodiment, the connection strength between the protection sheet and the first electrode tab 121 is improved, and the first covering portion 1225 and the second covering portion 1227 can enhance the welding strength with the connection sheet 310 .

[0167] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this application.

[0168] In the description of this application, it should be understood that the terms "including" and "having" and any variations thereof used in this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or are inherent to these processes, methods, products or apparatuses.

[0169] Unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," "fixed," etc. should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integration. They can be directly connected or indirectly connected through an intermediate medium. They can also refer to internal connections between two elements or interactions between two elements. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances. In addition, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated.

[0170] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell module, characterized in that: include: A first battery cell unit includes a first tab structure, wherein the first tab structure includes a first tab; The second battery cell unit includes a second tab structure, wherein the second tab structure includes a second tab; The transfer structure includes a connecting piece connected between a first tab structure and a second tab structure, wherein the first tab structure is connected to a first side of the connecting piece and covers the connecting piece, and the second tab structure is connected to a second side of the connecting piece and covers the connecting piece. Wherein, the first tab structure includes a protective sheet, the protective sheet and the first tab are welded to the connecting sheet, or the protective sheet is welded to the connecting sheet. And / or, the second tab structure includes a protection sheet, and the protection sheet and the second tab are welded to the connection sheet or the protection sheet is welded to the connection sheet.

2. The battery cell module according to claim 1, characterized in that: The first battery cell unit includes a first body, and the first tab structure is provided on the first body; The second battery cell unit includes a second main body, the second tab structure is arranged on the second main body, the first tab structure, the second tab structure, the first main body and the second main body can form an installation area, and the connecting piece is arranged in the installation area.

3. The battery cell module according to claim 2, characterized in that: A pole is formed on the connecting piece, and the first side and the second side are respectively arranged on both sides of the pole.

4. The battery cell module according to claim 2, characterized in that: The switching structure further includes: An insulating sheet is arranged below the connecting sheet and is integrally formed with the connecting sheet.

5. The battery cell module according to any one of claims 2 to 4, characterized in that: The first pole tab includes a first pole tab welding portion and a first pole tab connecting portion, the first pole tab connecting portion connects the first main body and the first pole tab welding portion, the first pole tab welding portion is bent relative to the first pole tab connecting portion and covers the connecting sheet, and the protective sheet is welded to the first pole tab welding portion; and / or, the second pole tab includes a second pole tab welding portion and a second pole tab connecting portion, the second pole tab connecting portion connects the second main body and the second pole tab welding portion, the second pole tab welding portion is bent relative to the second pole tab connecting portion and covers the connecting sheet, and the protective sheet is welded to the second pole tab welding portion.

6. The battery cell module according to claim 5, characterized in that: The protection sheet includes a first sheet body, the first sheet body is welded to the first tab welding portion, and / or the first sheet body is welded to the second tab welding portion.

7. The battery cell module according to claim 6, characterized in that: The protective sheet also includes a bend and a second sheet, the bend is connected to the first sheet and the second sheet, the first tab welding portion is clamped between the first sheet and the second sheet, and / or the second tab welding portion is clamped between the first sheet and the second sheet.

8. The battery cell module according to any one of claims 2 to 4, characterized in that: The first tab includes a third tab connection portion, the third tab connection portion is connected to the first body and the top of the third tab connection portion is not higher than the surface of the connecting piece away from the first body; and / or the second tab includes a fourth tab connection portion, the fourth tab connection portion is connected to the second body and the top of the fourth tab connection portion is not higher than the surface of the connecting piece away from the second body.

9. The battery cell module according to claim 8, characterized in that: The protective sheet includes a first connecting portion and a first covering portion, the first connecting portion is connected to the third tab connecting portion, the first covering portion is bent relative to the first connecting portion and covers the connecting sheet, and / or the first connecting portion is connected to the fourth tab connecting portion.

10. The battery cell module according to claim 9, characterized in that: The protective sheet also includes a second connecting portion and a second covering portion, the second connecting portion is arranged parallel to the first connecting portion, the second covering portion is arranged parallel to the first covering portion, the first connecting portion and the second connecting portion are connected to both sides of the third pole tab connecting portion, the first covering portion and the second covering portion cover the connecting sheet, and / or the first connecting portion and the second connecting portion are connected to both sides of the fourth pole tab connecting portion.

11. The battery cell module according to claim 3, characterized in that: The distance from the center of the pole to the center of the first tab or the second tab is T, the thickness of the first cell unit or the second cell unit is W, and the thickness of the adapter structure is Z. Then, the range of T satisfies the relationship: 1 / 2Z≤T≤W.

12. The battery cell module according to claim 11, characterized in that: The thickness Z of the transition structure satisfies the relationship: 0.2mm≤Z≤2mm.

13. The battery cell module according to claim 12, characterized in that: The thickness of the connecting piece is W2, and W2 satisfies the relationship: 0.5Z≤W2≤0.9Z.

14. The battery cell module according to claim 11, characterized in that: The first tab or the second tab is welded to the connecting piece, and the depth of the welding point into the connecting piece is h1. The thickness of the connecting piece is W2. The h1 and W2 satisfy the relationship: 5%≤h1 / W2≤95%, And / or, the thickness of the first electrode tab or the second electrode tab is h2, the thickness of the protective sheet is W1, h2 satisfies the relationship: 0.2 mm ≤ h2 ≤ 1.5 mm, and W1 satisfies the relationship: 0.2 mm ≤ W1 ≤ 1.8 mm.

15. A battery, characterized in that: include: a housing having a receiving cavity; And the battery cell module according to any one of claims 1 to 14, wherein the battery cell module is accommodated in the accommodation cavity.

16. The battery according to claim 15, characterized in that The connecting piece in the battery module is raised to form a pole, and the pole extends out of the shell.

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