Battery and battery cell structure thereof

Abstract

The utility model provides a battery cell structure. The battery cell structure comprises a plurality of positive plates and a plurality of negative plates, each positive plate comprises a first positive sub-plate, a second positive sub-plate and a positive tab which are integrally connected, one end of the positive tab is connected with one positive sub-plate, and the other end of the positive tab is connected with the other positive sub-plate; the width of the first positive electrode sub-sheet and the width of the second positive electrode sub-sheet are both greater than the width of the positive electrode lug; each negative plate comprises a first negative sub-plate, a second negative sub-plate and a negative tab which are integrally connected, one end of the negative tab is connected with one negative sub-plate, and the other end of the negative tab is connected with the other negative sub-plate; the width of the first negative electrode sub-sheet and the width of the second negative electrode sub-sheet are both greater than the width of the negative electrode lug; the positive plates and the negative plates are stacked at intervals; a first insulating diaphragm is arranged between the adjacent first positive pole piece and first negative pole piece, and a second insulating diaphragm is arranged between the adjacent second positive pole piece and first negative pole piece. The utility model also provides a battery.

Description

Technical Field

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

[0002] In the prior art, a connecting piece is usually required to electrically connect two battery cells. When assembling the battery into a battery, the connecting piece needs to be welded to the top cover plate, and then the two battery cells are welded to both sides of the connecting piece, which results in more manufacturing processes for the battery and lower production efficiency. Utility Model Content

[0003] Based on this, it is necessary to provide a battery and its cell structure to address the above technical issues.

[0004] A battery cell structure, comprising: a plurality of positive electrode sheets and a plurality of negative electrode sheets; each of the positive electrode sheets comprises a first positive electrode sheet, a second positive electrode sheet and a positive electrode ear connected in one piece, wherein one end of the positive electrode ear in the first direction is connected to the first positive electrode sheet, and the other end of the positive electrode ear in the first direction is connected to the second positive electrode sheet; the width of the first positive electrode sheet in the second direction and the width of the second positive electrode sheet in the second direction are both greater than the width of the positive electrode ear in the second direction, wherein the second direction is perpendicular to the first direction; each of the negative electrode sheets comprises a first negative electrode sheet, a second positive electrode sheet and a positive electrode ear connected in one piece A second negative electrode sub-sheet and a negative electrode tab, wherein one end of the negative electrode tab in the first direction is connected to the first negative electrode sub-sheet, and the other end of the negative electrode tab in the first direction is connected to the second negative electrode sub-sheet; the width of the first negative electrode sub-sheet in the second direction and the width of the second negative electrode sub-sheet in the second direction are both greater than the width of the negative electrode tab in the second direction; each of the positive electrode sheets and each of the negative electrode sheets are stacked and spaced apart from each other; a first insulating diaphragm is provided between adjacent first positive electrode sub-sheets and first negative electrode sub-sheets, and a second insulating diaphragm is provided between adjacent second positive electrode sub-sheets and second negative electrode sub-sheets.

[0005] In one embodiment, each of the first positive electrode sub-sheets and each of the first negative electrode sub-sheets are overlapped and stacked.

[0006] In one embodiment, each of the second positive electrode sub-sheets and each of the second negative electrode sub-sheets are overlapped and stacked.

[0007] In one embodiment, the positive electrode tabs and the negative electrode tabs are staggered.

[0008] In one embodiment, the positive electrode tab is disposed close to the first side of the positive electrode sheet, the negative electrode tab is disposed away from the first side of the negative electrode sheet, and the first side of the positive electrode sheet is aligned with the first side of the negative electrode sheet.

[0009] In one embodiment, the positive electrode tabs are connected to each other.

[0010] In one embodiment, the negative electrode tabs are connected to each other.

[0011] In one embodiment, two sides of the first positive sub-sheet in the second direction are aligned with two sides of the second positive sub-sheet in the second direction, and the positive electrode tabs are located within two sides of the first positive sub-sheet in the second direction.

[0012] In one embodiment, two sides of the first negative sub-sheet in the second direction are aligned with two sides of the second negative sub-sheet in the second direction, and the negative electrode tabs are located within two sides of the first negative sub-sheet in the second direction.

[0013] A battery comprises the battery cell structure described in any one of the above embodiments.

[0014] The beneficial effects provided by the utility model are: by cutting the positive electrode sheet into the first positive electrode sheet, the second positive electrode sheet and the positive electrode ear that are connected in an integrated manner, and cutting the negative electrode sheet into the first negative electrode sheet, the second negative electrode sheet and the negative electrode ear that are connected in an integrated manner; by stacking the positive electrode sheets and the negative electrode sheets at intervals, and packaging them into battery cells, the positive electrode ear and the negative electrode ear will be exposed to the outside. When the battery cell structure packaged with the positive electrode sheets and the negative electrode sheets is welded on the top cover plate, it is only necessary to weld the positive electrode ear and the negative electrode ear on the top cover plate, without the need for connecting them with connecting sheets. With the battery cell structure set up as above, when it is installed on the top cover plate, there is no need to use connecting sheets for connection. Therefore, compared with the battery cell structure in the prior art, the welding process is reduced, and the efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the battery cell structure and the top cover plate in one direction in one embodiment;

[0016] Figure 2 It is a schematic diagram of the planar structure of a battery cell structure in one direction in one embodiment;

[0017] Figure 3 is a schematic diagram of a planar structure of a battery cell structure in another direction in an embodiment;

[0018] Figure 4 In one embodiment Figure 3 A partial enlarged schematic diagram of part A;

[0019] Figure 5 In one embodiment Figure 3 A partial enlarged schematic diagram of part A;

[0020] Figure 6 It is a schematic diagram of the planar structure of a positive electrode sheet in one direction in one embodiment;

[0021] Figure 7 It is a schematic diagram of the planar structure of a negative electrode sheet in one direction in an embodiment.

[0022] In the accompanying drawings, 10, battery cell structure; 100, positive electrode sheet; 110, first positive electrode sub-sheet; 120, second positive electrode sub-sheet; 130, positive electrode tab; 200, negative electrode sheet; 210, first negative electrode sub-sheet; 220, second negative electrode sub-sheet; 230, negative electrode tab; 300, first insulating diaphragm; 400, second insulating diaphragm; 500, top cover plate. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0024] In one embodiment, Figure 1 , Figure 2 , Figure 3 , Figure 6 and Figure 7 As shown, a battery cell structure 10 includes: a plurality of positive electrode sheets 100 and a plurality of negative electrode sheets 200; each of the positive electrode sheets 100 includes a first positive electrode sheet 110, a second positive electrode sheet 120 and a positive electrode tab 130 connected in one piece, wherein one end of the positive electrode tab 130 in the first direction is connected to the first positive electrode sheet 110, and the other end of the positive electrode tab 130 in the first direction is connected to the second positive electrode sheet 120; the width of the first positive electrode sheet 110 in the second direction and the width of the second positive electrode sheet 120 in the second direction are both greater than the width of the positive electrode tab 130 in the second direction, wherein the second direction is perpendicular to the first direction; each of the negative electrode sheets 200 includes a first negative electrode sheet 210, a second positive electrode sheet 120 connected in one piece, and a positive electrode tab 130 connected in one piece. A second negative electrode sub-sheet 220 and a negative electrode tab 230, wherein one end of the negative electrode tab 230 in the first direction is connected to the first negative electrode sub-sheet 210, and the other end of the negative electrode tab 230 in the first direction is connected to the second negative electrode sub-sheet 220; the width of the first negative electrode sub-sheet 210 in the second direction and the width of the second negative electrode sub-sheet 220 in the second direction are both greater than the width of the negative electrode tab 230 in the second direction; each of the positive electrode sheets 100 and each of the negative electrode sheets 200 are stacked and spaced apart from each other; a first insulating diaphragm 300 is arranged between adjacent first positive electrode sub-sheets 110 and first negative electrode sub-sheets 210, and a second insulating diaphragm 400 is arranged between adjacent second positive electrode sub-sheets 120 and second negative electrode sub-sheets 220.

[0025] Specifically, the positive electrode sheet 100 is cut into the first positive electrode sheet 110, the second positive electrode sheet 120 and the positive electrode tab 130 which are connected in an integrated manner, and the negative electrode sheet 200 is cut into the first negative electrode sheet 210, the second negative electrode sheet 220 and the negative electrode tab 230 which are connected in an integrated manner. After stacking the positive electrode sheets 100 and the negative electrode sheets 200 at intervals and packaging them into a battery cell, the positive electrode tabs 130 and the negative electrode tabs 230 will be exposed to the outside. When the battery cell structure 10 packaged with the positive electrode sheets 100 and the negative electrode sheets 200 is welded to the top cover plate 500, it is only necessary to weld the positive electrode tabs 130 and the negative electrode tabs 230 to the top cover plate 500 without the need to use connecting sheets for connection. The battery cell structure 10 provided as above does not need to be connected using a connecting piece when it is installed on the top cover plate 500 . Therefore, compared with the battery cell structure 10 in the prior art, the welding process is reduced and the efficiency is improved.

[0026] In this embodiment, if Figure 4 and Figure 5 As shown, a first insulating diaphragm 300 is disposed between the adjacent first positive sub-sheet 110 and the first negative sub-sheet 210, and a second insulating diaphragm 400 is disposed between the adjacent second positive sub-sheet 120 and the second negative sub-sheet 220, and the first insulating diaphragm 300 and the second insulating diaphragm 400 have an insulating function. Through the above arrangement, a short circuit between the first positive sub-sheet 110 and the first negative sub-sheet 210 can be prevented, and a short circuit between the second positive sub-sheet 120 and the second negative sub-sheet 220 can be prevented.

[0027] In order to facilitate packaging into a battery cell, in one embodiment, Figure 3 and Figure 4 The first positive sub-sheets 110 are stacked and overlapped with the first negative sub-sheets 210. Specifically, when the first positive sub-sheets 110 and the first negative sub-sheets 210 are stacked together, the first positive sub-sheets 110 and the first negative sub-sheets 210 will completely overlap, so that it is convenient to package the battery cell structure 10 formed by stacking the positive sheets 100 and the negative sheets 200.

[0028] In order to facilitate packaging into a battery cell, in one embodiment, Figure 3 and Figure 5As shown, each of the second positive sub-sheets 120 is overlapped and stacked with each of the second negative sub-sheets 220. Specifically, when each of the second positive sub-sheets 120 and each of the second negative sub-sheets 220 are stacked together, each of the second positive sub-sheets 120 and each of the second negative sub-sheets 220 will completely overlap, thereby facilitating the packaging of the battery cell structure 10 formed by stacking each of the positive sheets 100 and each of the negative sheets 200.

[0029] In order to facilitate welding of each of the positive electrode tabs 130 and each of the negative electrode tabs 230 to the top cover plate 500, in one embodiment, as Figure 2 , Figure 6 and Figure 7 As shown, each positive electrode tab 130 and each negative electrode tab 230 are staggered. Specifically, by staggering each positive electrode tab 130 and each negative electrode tab 230, each positive electrode tab 130 and each negative electrode tab 230 can be directly in contact with the top cover plate 500, so as to facilitate welding to the top cover plate 500.

[0030] In one embodiment, Figure 2 , Figure 6 and Figure 7 As shown, the positive electrode tab 130 is arranged close to the first side of the positive electrode sheet 100, and the negative electrode tab 230 is arranged away from the first side of the negative electrode sheet 200, and the first side of the positive electrode sheet 100 is aligned with the first side of the negative electrode sheet 200. Specifically, when each of the positive electrode sheets 100 and each of the negative electrode sheets 200 are stacked to form the battery cell structure 10, the positive electrode tab 130 is arranged close to the first side of the positive electrode sheet 100 and the negative electrode sheet 200, and the negative electrode tab 230 is arranged away from the first side of the positive electrode sheet 100 and the negative electrode sheet 200. At this time, the positive electrode tab 130 and the negative electrode tab 230 are staggered with each other. Through the above, a certain gap can be provided between the positive electrode tab 130 and the negative electrode tab 230 to avoid the short circuit between the positive electrode tab 130 and the negative electrode tab 230.

[0031] In order to facilitate welding of each of the positive electrode tabs 130 to the top cover plate 500, in one embodiment, as Figure 3 and Figure 6 As shown, the positive electrode tabs 130 are connected to each other. Specifically, the positive electrode tabs 130 are connected to each other by welding, so that it is convenient to weld the positive electrode tabs 130 to the top cover plate 500.

[0032] In order to facilitate welding of each of the negative electrode tabs 230 to the top cover plate 500, in one embodiment, as Figure 3 and Figure 7As shown, the negative electrode tabs 230 are connected to each other. Specifically, the negative electrode tabs 230 are connected to each other by welding, so that it is convenient to weld the negative electrode tabs 230 to the top cover plate 500.

[0033] In one embodiment, Figure 2 and Figure 6 As shown, the two sides of the first positive sub-sheet 110 in the second direction are aligned with the two sides of the second positive sub-sheet 120 in the second direction, and the positive pole tab 130 is located inside the two sides of the first positive sub-sheet 110 in the second direction. Specifically, since the top cover plate 500 needs to wrap the battery cell structure 10, through the above arrangement, the two sides of the positive pole tab 130 in the second direction are staggered with the two sides of the first positive sub-sheet 110 in the second direction and the two sides of the second positive sub-sheet 120 in the second direction, so that when the positive pole tab 130 is welded and set on the top cover plate 500, it will not exceed the size of the top cover plate 500.

[0034] In one embodiment, Figure 2 and Figure 7 As shown, the two sides of the first negative sub-sheet 210 in the second direction are aligned with the two sides of the second negative sub-sheet 220 in the second direction, and the negative pole tab 230 is located inside the two sides of the first negative sub-sheet 210 in the second direction. Specifically, since the top cover plate 500 needs to wrap the battery cell structure 10, through the above arrangement, the two sides of the negative pole tab 230 in the second direction are staggered with the two sides of the first negative sub-sheet 210 in the second direction and the two sides of the second negative sub-sheet 220 in the second direction, so that when the negative pole tab 230 is welded and set on the top cover plate 500, it will not exceed the size of the top cover plate 500.

[0035] In one embodiment, the first positive electrode sub-sheet and the second positive electrode sub-sheet are coated with a positive electrode coating material. Specifically, the positive electrode coating material includes lithium cobalt oxide, lithium iron oxide and a conductive polymer, and the conductive polymer includes polyacetylene, polyphenylene, polypyrrole, polythiophene and an active polysulfide compound. By coating the positive electrode coating material on the first positive electrode sub-sheet and the second positive electrode sub-sheet, the first positive electrode sub-sheet and the second positive electrode sub-sheet can be made conductive.

[0036] In one embodiment, the first negative electrode sub-sheet and the second negative electrode sub-sheet are coated with a negative electrode coating material. Specifically, the negative electrode coating material includes graphite, silicon, tin, etc. By coating the first negative electrode sub-sheet and the second negative electrode sub-sheet with the negative electrode coating material, the energy density and cycle life of the battery can be improved.

[0037] In one embodiment, the material of the positive electrode tab is aluminum foil. The aluminum foil has good conductivity and is relatively soft. Since the positive electrode potential is high, aluminum foil is selected to form an aluminum foil oxide layer on the positive electrode tab. The aluminum foil oxide layer is very dense and can prevent oxidation of the current collector.

[0038] In one embodiment, the negative electrode tab is made of copper foil. The copper foil has good electrical conductivity and is relatively soft. Since the negative electrode potential is low and the copper foil oxide layer is relatively loose, oxidation of the negative electrode tab can be prevented.

[0039] In one embodiment, the material of the first insulating diaphragm and the second insulating diaphragm is any one of a plastic material isolation membrane, a ceramic composite isolation membrane and a graphene isolation membrane. Specifically, the main component of the plastic material isolation membrane is a thermoplastic plastic such as polyethylene or polypropylene. The plastic material isolation membrane has good heat resistance and chemical corrosion resistance, and is relatively low in price, and is suitable for large-scale industrial production. The ceramic composite isolation membrane is an isolation membrane in which ceramic materials such as aluminum oxide are composited on thermoplastic plastics such as polypropylene or polyethylene. The ceramic composite isolation membrane has high temperature resistance and corrosion resistance, as well as good mechanical properties and a long service life. The graphene isolation membrane is made of a single layer of graphene, has extremely high thermal conductivity and mechanical strength, can well protect the positive and negative electrodes in the battery cell, and improve the durability and safety of the battery.

[0040] In one embodiment, a battery is provided, comprising the battery cell structure described in any one of the above embodiments.

[0041] Specifically, the battery manufactured by using the battery core structure does not need to be connected using connecting sheets, thus reducing the welding process and improving production efficiency.

[0042] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above 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.

[0043] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A battery cell structure, characterized in that: include: A plurality of positive electrode sheets and a plurality of negative electrode sheets; Each of the positive electrode sheets comprises a first positive electrode sheet, a second positive electrode sheet and a positive electrode tab which are connected in an integral manner, wherein one end of the positive electrode tab in the first direction is connected to the first positive electrode sheet, and the other end of the positive electrode tab in the first direction is connected to the second positive electrode sheet; The width of the first positive electrode sub-sheet in the second direction and the width of the second positive electrode sub-sheet in the second direction are both greater than the width of the positive electrode tab in the second direction, wherein the second direction is perpendicular to the first direction; Each of the negative electrode sheets comprises a first negative electrode sheet, a second negative electrode sheet and a negative electrode tab which are connected in an integral manner, wherein one end of the negative electrode tab in the first direction is connected to the first negative electrode sheet, and the other end of the negative electrode tab in the first direction is connected to the second negative electrode sheet; The width of the first negative electrode sub-sheet in the second direction and the width of the second negative electrode sub-sheet in the second direction are both greater than the width of the negative electrode tab in the second direction; The positive electrode sheets and the negative electrode sheets are stacked and spaced apart from each other; a first insulating separator is arranged between adjacent first positive electrode sheets and first negative electrode sheets, and a second insulating separator is arranged between adjacent second positive electrode sheets and second negative electrode sheets.

2. The battery cell structure according to claim 1, characterized in that: Each of the first positive electrode sub-sheets and each of the first negative electrode sub-sheets are overlapped and stacked.

3. The battery cell structure according to claim 1, characterized in that: Each of the second positive electrode sub-sheets and each of the second negative electrode sub-sheets are overlapped and stacked.

4. The battery cell structure according to claim 1, characterized in that: The positive electrode tabs and the negative electrode tabs are staggered.

5. The battery cell structure according to claim 4, characterized in that: The positive electrode tab is arranged close to the first side of the positive electrode sheet, the negative electrode tab is arranged away from the first side of the negative electrode sheet, and the first side of the positive electrode sheet is aligned with the first side of the negative electrode sheet.

6. The battery cell structure according to claim 1, characterized in that: The positive electrode tabs are connected to each other.

7. The battery cell structure according to claim 1, characterized in that: The negative electrode tabs are connected to each other.

8. The battery cell structure according to claim 1, characterized in that: The two sides of the first positive sub-sheet in the second direction are aligned with the two sides of the second positive sub-sheet in the second direction, and the positive electrode tabs are located within the two sides of the first positive sub-sheet in the second direction.

9. The battery core structure according to claim 1, characterized in that: The two sides of the first negative electrode sub-sheet in the second direction are aligned with the two sides of the second negative electrode sub-sheet in the second direction, and the negative electrode tabs are located within the two sides of the first negative electrode sub-sheet in the second direction.

10. A battery, characterized in that: The invention comprises the battery core structure as described in any one of claims 1 to 9.

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