Battery cell and battery cell group

Abstract

The utility model relates to a battery cell and a battery cell group, the length of a tab can be reduced, the battery cell comprises a first pole core body, a first tab and a first adapter plate, the first tab is connected with the first pole core body, the first adapter plate comprises a first connecting part and a second connecting part, the first connecting part and the second connecting part are connected and are arranged in a folding manner; the first pole core body is connected with the first pole core body, the second pole core body is connected with the second pole core body, the third pole lug is connected with the second pole core body, and the third pole lug and the first pole lug are arranged on the same side of the first pole core body and the second pole core body assembly; wherein the first connecting part is connected with the first tab, the third switching piece is connected with the third tab, and the third switching piece and the second connecting part are stacked.

Description

Technical Field

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

[0002] To pursue higher-capacity batteries, larger cells are required, and high-capacity single cells are also thicker. Currently, most laminated cells are welded to the tabs at the ends of the stacked core and then bent into the shell. As the thickness of the cell increases, the thickness of the tabs also increases to meet certain overcurrent requirements, making it more difficult to bend the tabs during assembly. Furthermore, the tabs need to be extended longer for bending and welding, but the increased length of the tabs can easily cause them to fold and break during the manufacturing process. Utility Model Content

[0003] Based on this, the present disclosure proposes a battery cell and a battery cell pack to solve the problem of reducing the difficulty of bending the adapter and shortening the length of the tab.

[0004] According to one aspect of the present disclosure, a first pole core body, a first pole tab, and a first adapter plate, wherein the first pole tab is connected to the first pole core body, and the first adapter plate includes a first connecting portion and a second connecting portion, wherein the first connecting portion is connected to the second connecting portion and is folded;

[0005] A second pole core body, a third pole tab and a third adapter plate, wherein the third pole tab is connected to the second pole core body, and the third pole tab and the first pole tab are arranged on the same side of the first pole core body and the second pole core body assembly;

[0006] The first connecting portion is connected to the first tab, the third adapter is connected to the third tab, and the third adapter is stacked with the second connecting portion.

[0007] In some embodiments, the first tab has a first extension portion, the third tab has a second extension portion, the second extension portion and the first extension portion extend toward each other, the first connecting portion is connected to the first extension portion, and the third adapter is connected to the second extension portion.

[0008] In some embodiments, the first extension portion is clamped between the first connection portion and the second connection portion, and is connected to the first connection portion; the second extension portion is clamped between the third adapter plate and the second connection portion, and is connected to the third adapter plate.

[0009] In some embodiments, the battery cell further includes a second pole tab and a second adapter plate, and the second pole tab is connected to the first pole core body; the battery cell further includes a fourth pole tab and a fourth adapter plate, and the fourth pole tab is connected to the second pole core body, and the fourth pole tab and the second pole tab are arranged on the other side of the first pole core body and the second pole core body assembly; wherein, the second adapter plate includes a third connection portion and a fourth connection portion, the third connection portion is connected to the fourth connection portion and is folded, the third connection portion is connected to the second pole tab, the fourth adapter plate is connected to the fourth pole tab, and the fourth adapter plate is stacked with the fourth connection portion; or the fourth adapter plate includes a third connection portion and a fourth connection portion, the third connection portion is connected to the fourth connection portion and is folded, the third connection portion is connected to the fourth pole tab, the second adapter plate is connected to the fourth pole tab, and the second adapter plate is stacked with the fourth connection portion.

[0010] In some embodiments, the second electrode tab has a third extension portion, the fourth electrode tab has a fourth extension portion, and the fourth extension portion and the third extension portion extend toward each other; the second adapter plate includes a third connecting portion and a fourth connecting portion, the third connecting portion is connected to the third extension portion; and the fourth adapter plate is connected to the fourth extension portion.

[0011] In some embodiments, the third extending portion is sandwiched between the third connecting portion and the fourth connecting portion; and the fourth extending portion is sandwiched between the fourth adapter plate and the fourth connecting portion.

[0012] In some embodiments, the second electrode tab has a third extension portion, the fourth electrode tab has a fourth extension portion, and the fourth extension portion and the third extension portion extend toward each other; the fourth adapter plate includes a third connecting portion and a fourth connecting portion, and the third connecting portion is connected to the fourth extension portion; and the second adapter plate is connected to the third extension portion.

[0013] In some embodiments, the fourth extending portion is sandwiched between the third connecting portion and the fourth connecting portion; and the third extending portion is sandwiched between the second adapter plate and the fourth connecting portion.

[0014] In some embodiments, a first cover plate, a second cover plate and a shell are further included, wherein the first pole core body and the second pole core body are accommodated in the shell, and the first cover plate, the second cover plate and the shell cooperate to seal the first pole core body and the second pole core body, wherein the first cover plate is connected to the first adapter plate or the third adapter plate, and the second cover plate is connected to the second adapter plate or the fourth adapter plate.

[0015] According to one aspect of the present disclosure, a battery cell pack includes the battery cell as described above.

[0016] By using the first and third adapter plates as intermediate connectors, the lengths of the first and third tabs are reduced. By using the second and fourth adapter plates as intermediate connectors, the lengths of the second and fourth tabs are reduced, thereby reducing the lengths of each tab while increasing the thickness of the core and improving the energy density of the battery cell. Furthermore, the first and third adapter plates can share the overcurrent requirements of the positive terminal of the battery cell, while the second and fourth adapter plates can share the overcurrent requirements of the negative terminal of the battery cell, thereby reducing the thickness of each adapter plate. This makes it easier to bend each of the adapter plates when the first and second cover plates need to bend to accommodate the closing of the first and second cover plates on the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the structure of a battery cell according to an embodiment of the present disclosure.

[0018] Figure 2 This is a schematic diagram of the positional relationship between the first pole core body and the second pole core body before connection according to an embodiment of the present disclosure.

[0019] Figure 3 This is a schematic diagram of a connection structure between a first pole core body and a second pole core body according to an embodiment of the present disclosure.

[0020] Figure 4 This is a schematic diagram of a connection state of a first pole core body, a second pole core body and a second cover plate in a battery cell according to an embodiment of the present disclosure.

[0021] Figure 5 Schematic diagram of the structure of the second cover plate in the closed state of the battery cell according to one embodiment of the present disclosure.

[0022] Figure 6 This is a structural schematic diagram of a battery cell according to an embodiment of the present disclosure when the first pole core body and the second pole core body are placed in a shell and connected to a first cover plate.

[0023] Figure 7 This is a schematic diagram of another connection structure between the first pole core body, the second pole core body and the second cover plate according to an embodiment of the present disclosure.

[0024] Description of reference numerals:

[0025] 100. Battery cell; 10. Electrode core assembly; 110. First electrode core body; 111. First electrode tab; 1111. First extension portion; 112. Second electrode tab; 1121. Third extension portion; 120. Second electrode core body; 121. Third electrode tab; 1211. Second extension portion; 122. Fourth electrode tab; 1221. Fourth extension portion; 20. First adapter; 210. First connecting portion; 220. Second connecting portion; 30. Third adapter; 40. Second adapter; 410. Third connecting portion; 420. Fourth connecting portion; 50. Fourth adapter; 60. Housing; 70. First cover; 80. Second cover. DETAILED DESCRIPTION

[0026] To make the above-mentioned objects, features, and advantages of the present disclosure more clearly understood, specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present disclosure. However, the present disclosure can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without violating the scope of the present disclosure. Therefore, the present disclosure is not limited to the specific embodiments disclosed below.

[0027] In the description of the present disclosure, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present disclosure and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0028] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly indicate the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this disclosure, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0029] In this disclosure, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise expressly limited. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on the specific circumstances.

[0030] In this disclosure, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions appear, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, the phrase "above," "above," and "above" a first feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. The phrase "below," "below," and "below" a first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0031] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "right", "to the right" and similar expressions used in this disclosure are for illustrative purposes only and do not represent the only embodiment.

[0032] refer to Figure 1 An embodiment of the first aspect of the present disclosure provides a battery cell 100 . The battery cell 100 includes at least one electrode core group 10 . Figure 1 Only one pole core group 10 is schematically illustrated.

[0033] The electrode assembly 10 includes a first electrode body 110 and a second electrode body 120. The first electrode body 110 is connected to a first electrode tab 111 and a second electrode tab 112. The second electrode body 120 is connected to a third electrode tab 121 and a fourth electrode tab 122. Multiple first electrode tabs 111 and second electrode tabs 112 are provided, each connected to the positive electrode sheet and the negative electrode sheet in the first electrode body 110. Multiple third electrode tabs 121 and fourth electrode tabs 122 are provided, each connected to the positive electrode sheet and the negative electrode sheet in the second electrode body 120.

[0034] The first pole core body 110 and the second pole core body 120 are both single-cell batteries. The first pole core body 110 and the second pole core body 120 can be stacked cores or wound cores.

[0035] In one example, they are stacked cores, which can be obtained by cutting the positive electrode sheet, the negative electrode sheet, and the separator into specified sizes, and then stacking the positive electrode sheet, the separator, and the negative electrode sheet into a battery cell.

[0036] like Figure 1 As shown, in this embodiment, the first pole core body 110 and the second pole core body 120 are both stacked cores, stacked along the first direction Z. When the number of pole core groups 10 is greater than one, multiple pole core groups 10 are stacked in the first direction Z.

[0037] In this disclosure, the first direction Z is the thickness direction of the first and second pole core bodies 110, 120. The second direction X is specifically the length direction of the first and second pole core bodies 110, 120. The third direction Y is the width direction of the first and second pole core bodies 110, 120. Generally, taking the first pole core body 110 as an example, its thickness direction is perpendicular to its large surface, i.e., the two sides with the largest area. Both the second direction X and the third direction Y are parallel to the large surface of the first pole core body 110.

[0038] The electrode core assembly 10 further includes a first adapter plate 20 and a third adapter plate 30. The first adapter plate 20 and the third adapter plate 30 are connected to each other, and the first adapter plate 20 and the third adapter plate 30 jointly connect the first electrode tab 111 and the third electrode tab 121. Specifically, the first adapter plate 20 is connected to the first electrode tab 111, the third adapter plate 30 is connected to the third electrode tab 121, and the first adapter plate 20 is connected to the third adapter plate 30.

[0039] The electrode core assembly 10 further includes a second adapter plate 40 and a fourth adapter plate 50, which are connected to each other. The second adapter plate 40 and the fourth adapter plate 50 jointly connect the second electrode tab 112 to the fourth electrode tab 122. Specifically, the second adapter plate 40 is connected to the second electrode tab 112, the fourth adapter plate 50 is connected to the fourth electrode tab 122, and the second adapter plate 40 is connected to the fourth adapter plate 50.

[0040] Furthermore, the battery cell 100 further includes a first cover plate 70, a second cover plate 80, and a housing 60. At this point, at least one core assembly 10 is placed within the housing 60, and the first and second cover plates 70, 80, and the housing 60 collectively seal the core assembly 10 within the housing 60. The third adapter plate 30 is connected to the first cover plate 70. The fourth adapter plate 50 is connected to the second cover plate 80.

[0041] In the battery cell 100 disclosed herein, the first adapter plate 20 and the third adapter plate 30 serve as intermediate connectors, thereby reducing the length of the first and third tabs 111 and 121. Furthermore, the second and fourth adapter plates 40 and 50 serve as intermediate connectors, thereby reducing the length of the second and fourth tabs 112 and 122, respectively. This allows the length of each tab to be reduced while increasing the thickness of the battery cell and improving the energy density of the battery cell 100. Furthermore, the first and third adapter plates 20 and 30 can share the overcurrent requirements of the positive terminal of the battery cell 100, while the second and fourth adapter plates 40 and 50 can share the overcurrent requirements of the negative terminal of the battery cell 100, thereby reducing the thickness of each adapter plate. This allows each adapter plate to bend easily when the first and second cover plates 70 and 80 need to be folded to accommodate the closing of the cover plate 60.

[0042] like Figures 1 to 4 As shown, the first adapter plate 20 includes a first connecting portion 210 and a second connecting portion 220. The first connecting portion 210 is connected to the second connecting portion 220 and is folded. The first connecting portion 210 is connected to the first tab 111; the third adapter plate 30 is connected to the third tab 121, and the second adapter plate 40 is connected to the second connecting portion 220.

[0043] Before connecting to the first tab 111, the first adapter plate 20 is pre-bent to form a first connecting portion 210 and a second connecting portion 220. One end of the first connecting portion 210 is connected to the end of the second connecting portion 220, and the two portions are bent relative to each other and then extended. The second connecting portion 220 allows the first adapter plate 20 and the third adapter plate 30 to face each other, facilitating welding.

[0044] like Figure 1 、 Figure 3 As shown, the first tab 111 has a first extension portion 1111 , the third tab 121 has a second extension portion 1211 , and the second extension portion 1211 and the first extension portion 1111 extend toward each other; the first connecting portion 210 is connected to the first extension portion 1111 , and the third adapter plate 30 is connected to the second extension portion 1211 .

[0045] The first extension portion 1111 is formed after the first electrode tab 111 is bent and extends along the first direction Z. During the bending process of the first electrode tab 111, the first extension portion 1111 is not bent. The second extension portion 1211 is formed after the third electrode tab 121 is bent and extends along the first direction Z. During the bending process of the third electrode tab 121, the second extension portion 1211 is not bent.

[0046] In some embodiments, the first extension portion 1111 is sandwiched between the first connection portion 210 and the second connection portion 220 and is connected to the first connection portion 210 ; the second extension portion 1211 is sandwiched between the third adapter plate 30 and the second connection portion 220 and is connected to the third adapter plate 30 .

[0047] The first extension portion 1111 is sandwiched between the first connecting portion 210 and the second connecting portion 220. This increases the contact area between the first tab 111 and the first adapter plate 20, improving current transmission. The second extension portion 1211 is sandwiched between the third adapter plate 30 and the second connecting portion 220, ensuring a stable electrical connection between the third tab 121 and the third adapter plate 30 and improving current transmission.

[0048] In some embodiments, such as Figures 1 to 4 As shown, the second adapter plate 40 includes a third connecting portion 410 and a fourth connecting portion 420, and the third connecting portion 410 is connected to the fourth connecting portion 420 and is folded. The third connecting portion 410 is connected to the second pole tab 112; the fourth adapter plate 50 is connected to the fourth pole tab 122, and the second adapter plate is connected to the fourth connecting portion 420. The second adapter plate 40 is pre-bent to form the third connecting portion 410 and the fourth connecting portion 420. One end of the third connecting portion 410 is connected to the end of the fourth connecting portion 420, and they are bent relative to each other and then extended. By providing the fourth connecting portion 420, the second adapter plate 40 and the fourth adapter plate 50 are face to face, which facilitates welding.

[0049] The third adapter plate 30 is connected to the unbent second extension portion 1211, that is, the third adapter plate 30 is connected outside the bending area of ​​the third tab 121. During the bending process of the third tab 121, the third adapter plate 30 will not be bent, and the bending difficulty is low.

[0050] After the third tab 121 is bent, the first connecting portion 210 and the second connecting portion 220 are folded together. The second connecting portion 220 bends upward relative to the first connecting portion 210. The third adapter 30, the second connecting portion 220, and the first connecting portion 210 are arranged in sequence, gradually approaching the two pole core bodies.

[0051] In some embodiments, such as Figure 1 As shown, the second tab 112 has a third extension portion 1121, and the fourth tab 122 has a fourth extension portion 1221. The fourth extension portion 1221 and the third extension portion 1121 extend toward each other. The third connecting portion 410 is connected to the third extension portion 1121 of the second tab 112. The fourth adapter 50 is connected to the second extension portion 1211 of the fourth tab 122.

[0052] The third extension portion 1121 is formed after the second electrode tab 112 is bent and extends along the first direction Z. During the bending process of the second electrode tab 112, the third extension portion 1121 is not bent. The fourth extension portion 1221 is formed after the fourth electrode tab 122 is bent and extends along the first direction Z.

[0053] The fourth adapter plate 50 is connected to the unbent fourth extension portion 1221, that is, the fourth adapter plate 50 is connected outside the bending area of ​​the fourth tab 122. In this way, the fourth adapter plate 50 will not be bent during the bending process of the third tab 121, and the bending difficulty is low.

[0054] After the fourth tab 122 is bent, the third connection portion 410 and the fourth connection portion 420 are folded. The fourth adapter 50, the fourth connection portion 420, and the third connection portion 410 are sequentially arranged and gradually approach the two pole core bodies.

[0055] In some embodiments, the third extending portion 1121 is sandwiched between the third connecting portion 410 and the fourth connecting portion 420 and is connected to the first connecting portion 210 ; the fourth extending portion 1221 is sandwiched between the fourth adapter plate 50 and the fourth connecting portion 420 .

[0056] The third extension portion 1121 is sandwiched between the third connecting portion 410 and the fourth connecting portion 420. The contact area between the second tab 112 and the second adapter plate 40 is large, improving current transmission. The fourth extension portion 1221 is sandwiched between the fourth adapter plate 50 and the fourth connecting portion 420, ensuring a stable electrical connection between the fourth tab 122 and the fourth adapter plate 50 and improving current transmission.

[0057] refer to Figures 2 to 6 The preparation process of the battery cell 100 of this embodiment is as follows:

[0058] 1. Reference Figure 2 , Figure 2 The diagram shows the positional relationship between the first pole core body 110 and the second pole core body 120 in the pole core assembly 10 before connection. In this embodiment, in the second direction X, the first pole tab 111 and the second pole tab 112 are located at opposite ends of the first pole core body 110; the third pole tab 121 and the fourth pole tab 122 are located at opposite ends of the second pole core body 120. The second direction X is perpendicular to the first direction Z.

[0059] The first pole core body 110 and the second pole core body 120 are arranged in an upper and lower arrangement, with the first pole core body 110 located above the second pole core body 120. The first adapter plate 20 is welded to the first extension portion 1111 of the first pole tab 111, and the third adapter plate 30 is welded to the second extension portion 1211 of the third pole tab 121, with the first adapter plate 20 located above the third adapter plate 30. The second adapter plate 40 is welded to the third extension portion 1121 of the second pole tab 112, and the fourth adapter plate 50 is welded to the fourth extension portion 1221 of the fourth pole tab 122, with the second adapter plate 40 located above the fourth adapter plate 50.

[0060] 2. Reference Figure 3 Bend the first tab 111 downward and weld the second connection portion 220 of the first adapter plate 20 to the third adapter plate 30. Bend the second tab 112 and weld the second adapter plate 40 to the fourth adapter plate 50. The first adapter plate 20 and the third adapter plate 30 can be connected by laser welding or ultrasonic welding. The fourth connection portion 420 of the second adapter plate 40 and the fourth adapter plate 50 can be connected by laser welding or ultrasonic welding. In this way, the first tab 111 and the third tab 121 are connected, and the second tab 112 and the fourth tab 122 are connected, forming the electrode core assembly 10.

[0061] 3. Reference Figure 4 、 Figure 5 The second cover plate 80 is connected to the side of the fourth adapter plate 50 facing away from the second adapter plate 40 by laser welding or ultrasonic welding.

[0062] IV. Reference Figure 4 、 Figure 6 Bend the fourth electrode tab 122 so that the fourth adapter plate 50 and the first adapter plate 20 are stacked in the second direction X. The second cover plate 80 is flipped to one side of the two electrode core bodies. In this process, only the fourth electrode tab 122 is bent, and the fourth adapter plate 50 does not need to be bent, thereby reducing the bending difficulty.

[0063] 5. Reference Figure 1 , install the first pole core body 110 and the second pole core body 120 into the shell 60, and weld the second cover plate 80 to the shell 60.

[0064] 6. With Figure 5 and Figure 6 The illustrated operation is similar: connect the first cover plate 70 to the side of the third adapter plate 30 facing away from the first adapter plate 20. Bend the third tab 121 so that the third adapter plate 30 and the first adapter plate 20 overlap in the second direction X. Flip the first cover plate 70 to the side facing the two electrode cores. During this process, only the third tab 121 is bent, not the third adapter plate 30, thus reducing the bending difficulty.

[0065] 7. Finally, weld the first cover plate 70 to the housing 60 to obtain Figure 1 The structure shown.

[0066] like Figure 1 、 Figure 3 and Figure 4 As shown, in this embodiment, the first connecting portion 210 is connected to the first extension portion 1111 of the first electrode tab 111, and the third adapter plate 30 is connected to the second extension portion 1211 of the third electrode tab 121. At the same time, the third connecting portion 410 is connected to the third extension portion 1121 of the second electrode tab 112, and the third adapter plate 30 is connected to the second extension portion 1211 of the third electrode tab 121.

[0067] Thus, when the first pole core body 110 is located above the second pole core body 120 , the second connection portion 220 bends and extends upward relative to the first connection portion 210 . The fourth connection portion 420 bends and extends upward relative to the third connection portion 410 .

[0068] In other alternative embodiments, when the first connecting portion 210 is connected to the first extension portion 1111 of the first electrode tab 111 and the third adapter plate 30 is connected to the second extension portion 1211 of the third electrode tab 121, the second adapter plate 40 and the fourth adapter plate 50 may also have other settings.

[0069] Specifically, if Figure 7 As shown, in other alternative embodiments, the fourth adapter plate 50 includes a third connecting portion 410 and a fourth connecting portion 420, the third connecting portion 410 is connected to the fourth connecting portion 420 and is folded, the third connecting portion 410 is connected to the fourth pole ear 122, the second adapter plate 40 is connected to the fourth pole ear 122, and the second adapter plate 40 is connected to the fourth connecting portion 420 in a stacked manner.

[0070] Furthermore, the third connecting portion 410 is connected to the fourth extending portion 1221; the second adapter plate 40 is connected to the third extending portion 1121. The fourth extending portion 1221 is sandwiched between the third connecting portion 410 and the fourth connecting portion 420; and the third extending portion is sandwiched between the second adapter plate and the fourth connecting portion.

[0071] Thus, in alternative embodiments, when the first pole core body 110 is located above the second pole core body 120 , the second connection portion 220 bends and extends upward relative to the first connection portion 210 , and the fourth connection portion 420 bends and extends downward relative to the third connection portion 410 .

[0072] In some embodiments, a plurality of pole core assemblies 10 are provided, and the connection areas of each third adapter plate 30 and the first cover plate 70 are staggered in the third direction Y. The connection areas of each fourth adapter plate 50 and the second cover plate 80 are staggered in the third direction Y. The third direction Y is perpendicular to the first direction Z and the second direction X. The third direction Y is specifically the width direction of the first pole core body 110.

[0073] The plurality of pole core assemblies 10 are connected to the first cover plate 70 via respective third adapter plates 30, and the connection areas of the plurality of third adapter plates 30 and the first cover plate 70 are staggered so as not to interfere with each other. The plurality of pole core assemblies 10 are connected to the second cover plate 80 via respective fourth adapter plates 50, and the connection areas of the plurality of fourth adapter plates 50 and the first cover plate 70 are staggered so as not to interfere with each other.

[0074] An embodiment of the second aspect of the present disclosure further provides a battery cell pack, which includes the battery cell 100 of any of the above embodiments.

[0075] Optionally, the battery cell group includes multiple battery cells 100, which are connected in series, parallel or mixed. Optionally, the battery cell group includes at least one battery cell 100 and at least one battery cell of other structures, which are connected in series, parallel or mixed.

[0076] The battery cell 100 in the battery cell assembly of the present disclosure uses the first adapter plate 20 and the third adapter plate 30 as intermediate connectors, thereby reducing the length of the first pole tab 111 and the length of the third pole tab 121. By providing the second adapter plate 40 and the fourth adapter plate 50 as intermediate connectors, the length of the second pole tab 112 and the length of the fourth pole tab 122 are reduced, thereby reducing the length of each pole tab while increasing the thickness of the pole core and improving the energy density of the battery cell 100. In addition, the first adapter plate 20 and the third adapter plate 30 can share the overcurrent requirement of the positive terminal of the battery cell 100, while the second adapter plate 40 and the fourth adapter plate 50 can share the overcurrent requirement of the negative terminal of the battery cell 100, thereby reducing the thickness of each adapter plate and making each adapter plate easier to bend.

[0077] Finally, it should be noted that the various technical features of the above-described embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the various technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0078] The above-described embodiments merely represent several implementation methods of the present disclosure. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the scope of the present disclosure, all of which fall within the scope of protection of the present disclosure. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A battery cell, characterized in that: The battery cell comprises: A first pole core body, a first pole tab, and a first adapter plate, wherein the first pole tab is connected to the first pole core body, and the first adapter plate includes a first connecting portion and a second connecting portion, wherein the first connecting portion and the second connecting portion are connected and folded; A second pole core body, a third pole tab and a third adapter plate, wherein the third pole tab is connected to the second pole core body, and the third pole tab and the first pole tab are arranged on the same side of the first pole core body and the second pole core body assembly; The first connecting portion is connected to the first tab, the third adapter is connected to the third tab, and the third adapter is stacked with the second connecting portion.

2. The battery cell according to claim 1, characterized in that The first electrode tab has a first extension portion, the third electrode tab has a second extension portion, the second extension portion and the first extension portion extend toward each other, the first connecting portion is connected to the first extension portion, and the third adapter is connected to the second extension portion.

3. The battery cell according to claim 2, characterized in that The first extension portion is sandwiched between the first connection portion and the second connection portion, and is connected to the first connection portion; the second extension portion is sandwiched between the third adapter plate and the second connection portion, and is connected to the third adapter plate.

4. The battery cell according to claim 1, characterized in that The battery core further includes a second tab and a second adapter, wherein the second tab is connected to the first tab body; The battery cell further includes a fourth tab and a fourth adapter plate, wherein the fourth tab is connected to the second pole core body, and the fourth tab and the second tab are arranged on the other side of the first pole core body and the second pole core body assembly; wherein, The second adapter plate includes a third connecting portion and a fourth connecting portion, the third connecting portion is connected to the fourth connecting portion and is folded, the third connecting portion is connected to the second electrode tab, the fourth adapter plate is connected to the fourth electrode tab, and the fourth adapter plate is stacked and connected to the fourth connecting portion; Or the fourth adapter plate includes a third connecting portion and a fourth connecting portion, the third connecting portion is connected to the fourth connecting portion and is folded, the third connecting portion is connected to the fourth electrode tab, the second adapter plate is connected to the fourth electrode tab, and the second adapter plate is stacked and connected to the fourth connecting portion.

5. The battery cell according to claim 4, characterized in that: The second electrode tab has a third extension portion, the fourth electrode tab has a fourth extension portion, and the fourth extension portion and the third extension portion extend toward each other; the second adapter plate includes a third connecting portion and a fourth connecting portion, the third connecting portion is connected to the third extension portion; the fourth adapter plate is connected to the fourth extension portion.

6. The battery cell according to claim 5, characterized in that The third extending portion is sandwiched between the third connecting portion and the fourth connecting portion; and the fourth extending portion is sandwiched between the fourth adapter plate and the fourth connecting portion.

7. The battery cell according to claim 4, characterized in that The second electrode tab has a third extension portion, the fourth electrode tab has a fourth extension portion, and the fourth extension portion and the third extension portion extend toward each other; the fourth adapter plate includes a third connecting portion and a fourth connecting portion, the third connecting portion is connected to the fourth extension portion; the second adapter plate is connected to the third extension portion.

8. The battery cell according to claim 7, characterized in that: The fourth extending portion is sandwiched between the third connecting portion and the fourth connecting portion; and the third extending portion is sandwiched between the second adapter plate and the fourth connecting portion.

9. The battery cell according to claim 4, characterized in that: It also includes a first cover plate, a second cover plate and a shell, the first pole core body and the second pole core body are accommodated in the shell, the first cover plate, the second cover plate and the shell cooperate to seal the first pole core body and the second pole core body, wherein the first cover plate is connected to the first adapter plate or the third adapter plate, and the second cover plate is connected to the second adapter plate or the fourth adapter plate.

10. A battery cell pack, characterized in that: Comprising the battery cell according to any one of claims 1 to 9.

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