Battery structure with multiple battery cells

Abstract

The battery structure with the multiple battery cells comprises a shell and two battery cell groups, the two battery cell groups are a first battery cell group and a second battery cell group, the first battery cell group comprises a first pole core and a second pole core, a first positive pole connecting piece and a first negative pole connecting piece are arranged between the first pole core and the second pole core, and a second positive pole connecting piece and a second negative pole connecting piece are arranged between the first pole core and the second pole core. A first positive pole lug of the first pole core and a second positive pole lug of the second pole core are welded into a whole through a first positive pole connecting piece, and a first negative pole lug of the first pole core and a second negative pole lug of the second pole core are welded into a whole through a first negative pole connecting piece; the second battery core group comprises a third pole core and a fourth pole core, a second positive pole connecting piece and a second negative pole connecting piece are arranged between the third pole core and the fourth pole core, and a third positive pole lug of the third pole core and a second positive pole lug of the fourth pole core are welded into a whole through the second positive pole connecting piece. According to the utility model, the plurality of battery cells are arranged in the battery, so that the internal space of the shell is reasonably utilized, and the energy density of the battery cells is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery structure with multiple battery cells. Background Art

[0002] At present, the structure of lithium batteries is mainly composed of battery cells, top covers, shells, lead plates, and column ears. The battery cells of existing lithium batteries are usually single-cell structures, and the shapes of the battery cells are various, such as square batteries, cylindrical batteries, etc. The existing cylindrical batteries have small single-cell energy. If cylindrical batteries are used in electric vehicles, the battery system of the electric vehicle will require a large number of cylindrical batteries, which increases the complexity of the battery system, and also increases the battery system cell cost investment and battery management system cost.

[0003] During the assembly process of the existing lithium battery structure, a positive and negative lead sheet is usually placed between the battery cell and the pole. The lead sheet is first ultrasonically welded to the lower terminal of the pole with the corresponding polarity, and then the lead sheet is ultrasonically welded to the pole core tab with the corresponding polarity of the battery cell. The existing lithium battery assembly process will have the following problems:

[0004] The vibration waves of ultrasonic welding of the positive and negative electrode leads and the pole core ears may cause the risk of loosening in the area where the cover plate, the lead and the pole have been welded. Utility Model Content

[0005] In view of this, in order to solve the technical problems existing in the prior art, the utility model provides a battery structure in which each connecting piece is first welded to each pole ear, and then each connecting piece of the multi-pole core is respectively welded to the pole bottom plate, so as to avoid the risk of loosening of the pole bottom plate and the connecting piece welding area caused by vibration waves generated by ultrasonic welding of the connecting piece and the pole core pole ear, multiple battery cells are built in the same battery, the internal space of the shell is reasonably utilized, and the energy density of the battery cell is improved.

[0006] The utility model solves the above technical problems through the following technical solutions:

[0007] A battery structure with multiple cells, the battery structure comprising a shell and two cell groups, the two cell groups are built in the shell, the two cell groups are a first cell group and a second cell group, a top cover is fixed to the top of the shell, a positive electrode column and a negative electrode column are installed on the top cover, the positive electrode column is located on one side of the negative electrode column,

[0008] The first battery cell group comprises a first pole core and a second pole core, two pole lug ends of the first pole core are respectively welded with a first positive pole lug and a first negative pole lug, two pole lug ends of the second pole core are respectively welded with a second positive pole lug and a second negative pole lug, a first positive electrode connecting sheet and a first negative electrode connecting sheet are provided between the first pole core and the second pole core, the first positive pole lug of the first pole core is welded to the second positive pole lug of the second pole core through the first positive pole connecting sheet, and the first negative pole lug of the first pole core is welded to the second negative pole lug of the second pole core through the first negative pole connecting sheet;

[0009] The second battery core group includes a third pole core and a fourth pole core, two pole lug ends of the third pole core are respectively welded with a third positive pole lug and a third negative pole lug, two pole lug ends of the fourth pole core are respectively welded with a fourth positive pole lug and a fourth negative pole lug, a second positive electrode connecting sheet and a second negative electrode connecting sheet are provided between the third pole core and the fourth pole core, the third positive pole lug of the third pole core is welded to the second positive pole lug of the fourth pole core through the second positive pole connecting sheet, and the third negative pole lug of the third pole core is welded to the fourth negative pole lug of the fourth pole core through the second negative pole connecting sheet;

[0010] The first positive electrode tab, the second positive electrode tab and the first positive electrode connecting piece and the first negative electrode tab, the second negative electrode tab and the first negative electrode connecting piece are respectively welded to the positive electrode column and the negative electrode column of the top cover; the third positive electrode tab, the fourth positive electrode tab and the second positive electrode connecting piece and the third negative electrode tab, the fourth negative electrode tab and the second negative electrode connecting piece are respectively welded to the positive electrode column and the negative electrode column of the top cover.

[0011] Furthermore, the top end of the shell is provided with an end opening, the top cover is fixed to the end opening of the shell, the two ends of the top cover are provided with a positive pole column hole and a negative pole column hole, the positive pole is fixed in the positive pole column hole, the negative pole is fixed in the positive pole column hole, the bottom end of the top cover is fixed with a bottom plate, and the bottom ends of the positive pole and the negative pole are welded to the bottom plate.

[0012] Further, a first weld mark is formed at a welding point between the first positive electrode tab and the first positive electrode connecting sheet, a second weld mark is formed at a welding point between the second positive electrode tab and the first positive electrode connecting sheet, a third weld mark is formed at a welding point between the first negative electrode tab and the first negative electrode connecting sheet, a fourth weld mark is formed at a welding point between the second negative electrode tab and the first negative electrode connecting sheet, a fifth weld mark is formed at a welding point between the third positive electrode tab and the second positive electrode connecting sheet, a sixth weld mark is formed at a welding point between the fourth positive electrode tab and the second positive electrode connecting sheet, a seventh weld mark is formed at a welding point between the third negative electrode tab and the second negative electrode connecting sheet, and an eighth weld mark is formed at a welding point between the fourth negative electrode tab and the second negative electrode connecting sheet.

[0013] Furthermore, a high temperature resistant adhesive layer is affixed to the first weld mark, the second weld mark, the third weld mark, the fourth weld mark, the fifth weld mark, the sixth weld mark, the seventh weld mark and the eighth weld mark.

[0014] Furthermore, the first positive pole tab and the first negative pole tab are symmetrically welded to the two pole tab ends of the first pole core, the second positive pole tab and the second negative pole tab are symmetrically welded to the two pole tab ends of the second pole core, the third positive pole tab and the third negative pole tab are symmetrically welded to the two pole tab ends of the third pole core, and the fourth positive pole tab and the second negative pole tab are symmetrically welded to the two pole tab ends of the fourth pole core.

[0015] Furthermore, the first positive electrode tab, the second positive electrode tab, the third positive electrode tab, and the fourth positive electrode tab are all aluminum strips or aluminum alloy strips, and the first negative electrode tab, the second negative electrode tab, the third negative electrode tab, and the fourth negative electrode tab are all copper strips or copper alloy strips.

[0016] Furthermore, an acid- and alkali-resistant tape is provided between the two battery cell groups, and the two battery cell groups are bound and fixed by the acid- and alkali-resistant tape and built into the shell.

[0017] Furthermore, the welding is ultrasonic welding.

[0018] Compared with the prior art, the technical solution of the utility model has at least the following beneficial effects:

[0019] The battery structure of the utility model comprises a shell and two battery cell groups, the two battery cell groups are built in the shell, the two battery cell groups are a first battery cell group and a second battery cell group, a top cover is fixed on the top of the shell, a positive electrode column and a negative electrode column are installed on the top cover, the positive electrode column is located on one side of the negative electrode column, the first battery cell group comprises a first pole core and a second pole core, a first positive electrode connecting sheet and a first negative electrode connecting sheet are arranged between the first pole core and the second pole core, a first positive pole ear of the first pole core is welded to a second positive pole ear of the second pole core through the first positive pole connecting sheet, and a first negative pole ear of the first pole core is welded to a second negative pole ear of the second pole core through the first negative pole connecting sheet; the second battery cell group comprises a third pole core and a fourth pole core The third electrode core is provided with a second positive electrode connecting sheet and a second negative electrode connecting sheet between the third electrode core and the fourth electrode core, the third positive electrode ear of the third electrode core is welded as a whole with the second positive electrode ear of the fourth electrode core through the second positive electrode connecting sheet, the third negative electrode ear of the third electrode core is welded as a whole with the fourth negative electrode ear of the fourth electrode core through the second negative electrode connecting sheet, the first positive electrode ear, the second positive electrode ear and the first positive electrode connecting sheet and the first negative electrode ear, the second negative electrode ear and the first negative electrode connecting sheet are respectively welded to the positive electrode column and the negative electrode column of the top cover; the third positive electrode ear, the fourth positive electrode ear and the second positive electrode connecting sheet and the third negative electrode ear, the fourth negative electrode ear and the second negative electrode connecting sheet are respectively welded to the positive electrode column and the negative electrode column of the top cover. The battery structure of the present invention welds each connecting piece to each pole ear, and then welds each connecting piece of the multi-pole core to the pole bottom plate respectively, so as to avoid the risk of loosening of the pole bottom plate and the connecting piece welding area caused by vibration waves generated by ultrasonic welding of the connecting piece and the pole core pole ear. The present invention has multiple battery cells built in the same battery, so that the internal space of the shell is reasonably utilized, and the energy density of the battery cell is improved.

[0020] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the following is a detailed description in combination with the preferred embodiments and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of a multi-cell battery structure of the utility model;

[0022] Figure 2 This is a schematic diagram of the structure of a multi-cell battery cell of the utility model;

[0023] Figure 3 For this utility model Figure 2 A detailed enlarged schematic diagram of the middle A part;

[0024] Figure 4 It is a structural schematic diagram of the pole core and core of two battery cell groups of the utility model;

[0025] Figure 5 For this utility model Figure 4 A detailed enlarged diagram of part B in the middle;

[0026] Figure 6 It is a schematic diagram of the relationship between the first pole core of the utility model being connected to the second pole core through the first positive pole connecting sheet and the first negative pole connecting sheet;

[0027] Figure 7 It is a schematic diagram of the relationship between the third pole core of the utility model being connected to the fourth pole core through the second positive pole lead and the second negative pole lead;

[0028] Figure 8 It is a schematic diagram of the connection between the first pole core and the second pole core and the first positive electrode connecting sheet of the utility model;

[0029] Fig. 9 It is a schematic diagram of the connection between the first pole core and the second pole core and the first negative electrode connecting piece of the utility model;

[0030] Fig.10 It is a schematic diagram of the connection between the third pole core and the fourth pole core and the second positive electrode lead of the utility model;

[0031] Fig.11 It is a schematic diagram of the connection between the third pole core and the fourth pole core and the second negative electrode lead of the utility model;

[0032] Fig.12 It is a schematic diagram of the relationship between the first pole core, the second pole core, the third pole core, and the fourth pole core of the utility model being welded to the negative pole column through the first negative pole connecting piece and the second negative pole connecting piece;

[0033] Fig.13 It is a schematic diagram of the relationship between the first pole core, the second pole core, the third pole core, and the fourth pole core of the utility model being welded to the positive pole column through the first positive pole connecting piece and the second positive pole connecting piece;

[0034] Fig.14 It is a schematic diagram of the relationship between the first pole core, the second pole core, the third pole core and the fourth pole core of the utility model being welded to the positive and negative pole posts through the positive and negative pole leads.

[0035] In the figure: a first battery cell group 1, a first electrode core 11, a first positive electrode tab 111, a first negative electrode tab 112, a second electrode core 12, a second positive electrode tab 121, a second negative electrode tab 122, a second battery cell group 2, a third electrode core 21, a third positive electrode tab 211, a third negative electrode tab 212, a fourth electrode core 22, a fourth positive electrode tab 221, a fourth negative electrode tab 222, a shell 3, a top cover 4, a positive electrode column 41, a negative electrode column 42, a first positive electrode connecting sheet 5, a first positive bending structure 51, a first negative electrode connecting sheet 6, a first negative bending structure 61, a second positive electrode connecting sheet 7, a second positive bending structure 71, a second negative electrode connecting sheet 8, and a second negative bending structure 81. DETAILED DESCRIPTION

[0036] The present invention is described in detail below in conjunction with the accompanying drawings, which are part of this specification and illustrate the principle of the present invention through embodiments. Other aspects, features and advantages of the present invention will become clear through the detailed description. In the drawings referred to, the same or similar parts in different figures are represented by the same reference numerals.

[0037] like Figure 1-14As shown, the first embodiment of the utility model provides a battery structure with multiple battery cells, the battery structure includes a shell 3 and two battery cell groups, the two battery cell groups are built in the shell 3, an acid-alkali resistant tape is provided between the two battery cell groups, the two battery cell groups are bound and fixed by the acid-alkali resistant tape and built in the shell 3; the two battery cell groups are a first battery cell group 1 and a second battery cell group 2, a top cover 4 is fixed to the top of the shell 3, a positive electrode column 41 and a negative electrode column 42 are installed on the top cover 4, the positive electrode column 41 is located on one side of the negative electrode column 42, the first battery cell group 1 includes a first pole core 11 and a second pole core 12, the two poles of the first pole core 11 are fixed to the top of the shell 3, and the positive pole column 41 is located on one side of the negative pole column 42. The ear ends are respectively welded with a first positive pole ear 111 and a first negative pole ear 112, the two ear ends of the second pole core 12 are respectively welded with a second positive pole ear 121 and a second negative pole ear 122, a first positive electrode connecting sheet 5 and a first negative electrode connecting sheet 6 are arranged between the first pole core 11 and the second pole core 12, the first positive pole ear 111 of the first pole core 11 is welded to the second positive pole ear 121 of the second pole core 12 through the first positive electrode connecting sheet 5, and the first negative pole ear 112 of the first pole core 11 is welded to the second negative pole ear 122 of the second pole core 12 through the first negative electrode connecting sheet 6; The second battery cell group 2 includes a third pole core 21 and a fourth pole core 22. The two pole ear ends of the third pole core 21 are respectively welded with a third positive pole ear 211 and a third negative pole ear 212. The two pole ear ends of the fourth pole core 22 are respectively welded with a fourth positive pole ear 221 and a fourth negative pole ear 222. A second positive electrode connecting sheet 7 and a second negative electrode connecting sheet 8 are provided between the third pole core 21 and the fourth pole core 22. The third positive pole ear 211 of the third pole core 21 is welded to the second positive pole ear 121 of the fourth pole core 22 through the second positive electrode connecting sheet 7. The third negative pole ear 212 of the third pole core 21 is welded to the The fourth negative electrode tab 222 of the fourth electrode core 22 is welded together through the second negative electrode connecting sheet 8; the first positive electrode tab 111, the second positive electrode tab 121 and the first positive electrode connecting sheet 5 and the first negative electrode tab 112, the second negative electrode tab 122 and the first negative electrode connecting sheet 6 are respectively welded to the positive electrode column 41 and the negative electrode column 42 of the top cover 4; the third positive electrode tab 211, the fourth positive electrode tab 221 and the second positive electrode connecting sheet 7 and the third negative electrode tab 212, the fourth negative electrode tab 222 and the second negative electrode connecting sheet 8 are respectively welded to the positive electrode column 41 and the negative electrode column 42 of the top cover 4, and the welding is ultrasonic welding.

[0038] In other embodiments, the present invention may also be welded by laser welding.

[0039] In a specific implementation, there are two groups of first positive electrode bending structures 51 on the first positive electrode connecting sheet 5, and the two groups of first positive electrode bending structures 51 are symmetrically distributed on the first positive electrode connecting sheet 5. The first negative electrode connecting sheet 6 includes two groups of first negative electrode bending structures 61, and the two groups of first negative electrode bending structures 61 are symmetrically distributed on the first negative electrode connecting sheet 6. The two groups of first negative electrode bending structures 61 of the first negative electrode connecting sheet 6 and the two groups of first positive electrode bending structures 51 of the first positive electrode connecting sheet 5 are bent so as to combine the first pole core 11 and the second pole core 12. The second positive electrode connecting sheet 7 has two groups of second positive electrode bending structures 71, which are symmetrically distributed on the second positive electrode connecting sheet 7. The second negative electrode connecting sheet 8 includes two groups of second negative electrode bending structures 81, which are symmetrically distributed on the second negative electrode connecting sheet 8. The two groups of second negative electrode bending structures 81 of the second negative electrode connecting sheet 8 and the two groups of second positive electrode bending structures 71 of the second positive electrode connecting sheet 7 are bent to close the third pole core 21 and the fourth pole core 22. The utility model is provided with a bending structure on each connecting sheet, so that when closing the pole core, each connecting sheet and the corresponding pole core pole ear are bent at different positions of the connecting sheet, which can shorten the distance between the pole ear end diaphragm and the ultrasonic welding mark after the pole ear is folded.

[0040] The utility model is provided with an end opening at the top end of the shell 3, and the top cover 4 is fixed to the end opening of the shell 3. The two ends of the top cover 4 are provided with a positive pole column hole and a negative pole column hole. The positive pole column 41 is fixed in the positive pole column hole, and the negative pole column 42 is fixed in the positive pole column hole. The bottom end of the top cover 4 is fixed with a bottom plate, and the bottom ends of the positive pole column 41 and the negative pole column 42 are welded to the bottom plate.

[0041] In specific implementation, the utility model forms a first weld mark at the welding point between the first positive electrode tab 111 and the first positive electrode connecting sheet 5, a second weld mark is formed at the welding point between the second positive electrode tab 121 and the first positive electrode connecting sheet 5, a third weld mark is formed at the welding point between the first negative electrode tab 112 and the first negative electrode connecting sheet 6, a fourth weld mark is formed at the welding point between the second negative electrode tab 122 and the first negative electrode connecting sheet 6, a fifth weld mark is formed at the welding point between the third positive electrode tab 211 and the second positive electrode connecting sheet 7, a sixth weld mark is formed at the welding point between the fourth positive electrode tab 221 and the second positive electrode connecting sheet 7, a seventh weld mark is formed at the welding point between the third negative electrode tab 212 and the second negative electrode connecting sheet 8, and an eighth weld mark is formed at the welding point between the fourth negative electrode tab 222 and the second negative electrode connecting sheet 8. A high temperature resistant adhesive layer is affixed to the first weld mark, the second weld mark, the third weld mark, the fourth weld mark, the fifth weld mark, the sixth weld mark, the seventh weld mark and the eighth weld mark. The high temperature resistant adhesive layer is made of polyethylene terephthalate and has a thickness of 10 to 15 μm.

[0042] In the present invention, the first positive pole tab 111 and the first negative pole tab 112 are symmetrically welded to the two pole tab ends of the first pole core 11, the second positive pole tab 121 and the second negative pole tab 122 are symmetrically welded to the two pole tab ends of the second pole core 12, the third positive pole tab 211 and the third negative pole tab 212 are symmetrically welded to the two pole tab ends of the third pole core 21, and the fourth positive pole tab 221 and the second negative pole tab 122 are symmetrically welded to the two pole tab ends of the fourth pole core 22.

[0043] In specific implementation, the first positive electrode tab 111, the second positive electrode tab 121, the third positive electrode tab 211, and the fourth positive electrode tab 221 of the utility model are all made of aluminum strip or aluminum alloy strip, and the first negative electrode tab 112, the second negative electrode tab 122, the third negative electrode tab 212, and the fourth negative electrode tab 222 are all made of copper strip or copper alloy strip.

[0044] Compared with the prior art, the technical solution disclosed in the above embodiment has the following beneficial effects:

[0045] In the above embodiment, the connecting pieces of each pole core of the battery structure of the utility model are welded together with each pole ear, and then each connecting piece is respectively welded to the positive pole column 41 and the negative pole column 42 of the top cover 4, so as to avoid the risk of loosening of the pole column bottom plate and the connecting piece welding area caused by the vibration wave generated by the welding of the connecting piece and the pole core pole ear. The utility model has at least two battery cell groups built in the shell 3, which can realize the electrical connection of multiple battery cells in the same battery when stacked, so that the internal space of the shell 3 is reasonably utilized, and the energy density of the battery cell is improved, thereby improving the energy density and power density of the battery.

[0046] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the protection scope of the present invention.

Claims

1. A battery structure with multiple cells, characterized in that: The battery structure includes a shell and two battery cell groups, the two battery cell groups are built in the shell, the two battery cell groups are a first battery cell group and a second battery cell group, a top cover is fixed to the top of the shell, a positive electrode column and a negative electrode column are installed on the top cover, the positive electrode column is located on one side of the negative electrode column, The first battery cell group comprises a first pole core and a second pole core, two pole lug ends of the first pole core are respectively welded with a first positive pole lug and a first negative pole lug, two pole lug ends of the second pole core are respectively welded with a second positive pole lug and a second negative pole lug, a first positive electrode connecting sheet and a first negative electrode connecting sheet are provided between the first pole core and the second pole core, the first positive pole lug of the first pole core is welded to the second positive pole lug of the second pole core through the first positive pole connecting sheet, and the first negative pole lug of the first pole core is welded to the second negative pole lug of the second pole core through the first negative pole connecting sheet; The second battery core group includes a third pole core and a fourth pole core, two pole lug ends of the third pole core are respectively welded with a third positive pole lug and a third negative pole lug, two pole lug ends of the fourth pole core are respectively welded with a fourth positive pole lug and a fourth negative pole lug, a second positive electrode connecting sheet and a second negative electrode connecting sheet are provided between the third pole core and the fourth pole core, the third positive pole lug of the third pole core is welded to the second positive pole lug of the fourth pole core through the second positive pole connecting sheet, and the third negative pole lug of the third pole core is welded to the fourth negative pole lug of the fourth pole core through the second negative pole connecting sheet; The first positive electrode tab, the second positive electrode tab and the first positive electrode connecting piece and the first negative electrode tab, the second negative electrode tab and the first negative electrode connecting piece are respectively welded to the positive electrode column and the negative electrode column of the top cover; the third positive electrode tab, the fourth positive electrode tab and the second positive electrode connecting piece and the third negative electrode tab, the fourth negative electrode tab and the second negative electrode connecting piece are respectively welded to the positive electrode column and the negative electrode column of the top cover.

2. The battery structure with multiple cells according to claim 1, characterized in that: The top end of the shell is provided with an end opening, the top cover is fixed to the end opening of the shell, the two ends of the top cover are provided with a positive pole column hole and a negative pole column hole, the positive pole is fixed in the positive pole column hole, the negative pole is fixed in the positive pole column hole, the bottom end of the top cover is fixed with a bottom plate, and the bottom ends of the positive pole column and the negative pole column are welded to the bottom plate.

3. The battery structure with multiple cells according to claim 1, characterized in that: A first weld mark is formed at the welding place between the first positive electrode tab and the first positive electrode connecting sheet, a second weld mark is formed at the welding place between the second positive electrode tab and the first positive electrode connecting sheet, a third weld mark is formed at the welding place between the first negative electrode tab and the first negative electrode connecting sheet, a fourth weld mark is formed at the welding place between the second negative electrode tab and the first negative electrode connecting sheet, a fifth weld mark is formed at the welding place between the third positive electrode tab and the second positive electrode connecting sheet, a sixth weld mark is formed at the welding place between the fourth positive electrode tab and the second positive electrode connecting sheet, a seventh weld mark is formed at the welding place between the third negative electrode tab and the second negative electrode connecting sheet, and an eighth weld mark is formed at the welding place between the fourth negative electrode tab and the second negative electrode connecting sheet.

4. The battery structure with multiple cells according to claim 3, characterized in that: The first weld mark, the second weld mark, the third weld mark, the fourth weld mark, the fifth weld mark, the sixth weld mark, the seventh weld mark and the eighth weld mark are affixed with a high temperature resistant adhesive layer.

5. The battery structure with multiple cells according to claim 1, characterized in that: The first positive pole tab and the first negative pole tab are symmetrically welded to the two pole tab ends of the first pole core, the second positive pole tab and the second negative pole tab are symmetrically welded to the two pole tab ends of the second pole core, the third positive pole tab and the third negative pole tab are symmetrically welded to the two pole tab ends of the third pole core, and the fourth positive pole tab and the second negative pole tab are symmetrically welded to the two pole tab ends of the fourth pole core.

6. The battery structure with multiple cells according to claim 5, characterized in that: The first positive electrode tab, the second positive electrode tab, the third positive electrode tab, and the fourth positive electrode tab are all aluminum strips or aluminum alloy strips, and the first negative electrode tab, the second negative electrode tab, the third negative electrode tab, and the fourth negative electrode tab are all copper strips or copper alloy strips.

7. The battery structure with multiple cells according to claim 1, characterized in that: An acid- and alkali-resistant tape is provided between the two battery cell groups, and the two battery cell groups are bound and fixed by the acid- and alkali-resistant tape and built into the shell.

8. The battery structure with multiple cells according to claim 1, characterized in that: The welding is ultrasonic welding.

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