Laminated battery and battery module thereof

Abstract

The utility model provides a laminated battery and a battery module thereof, the laminated battery comprises a battery cell, the battery cell comprises negative plates, diaphragms and positive plates, the negative plates, the diaphragms and the positive plates are sequentially laminated, the outermost plates on two sides of the battery cell are respectively a first negative plate and a second negative plate, the diaphragm abutted against the first negative plate is a first diaphragm, and the diaphragm abutted against the second negative plate is a second diaphragm. The laminated battery further comprises a first rubberizing layer and a second rubberizing layer, one end of the first diaphragm is provided with a first bonding part, one end of the second diaphragm is provided with a second bonding part, the first rubberizing layer is bonded to the first negative plate and the first bonding part, and the second rubberizing layer is bonded to the second negative plate and the second bonding part. And the second rubberizing layer is respectively adhered to the second negative plate and the second adhering part. According to the battery structure provided by the invention, the fixing effect of the outermost-layer pole piece is relatively good, and the outermost-layer pole piece of the battery cell is prevented from being pulled to be misplaced in the tab bending process.

Description

Technical Field

[0001] The present disclosure relates to the technical field of lithium battery cell adhesive bonding, and in particular to a laminated battery and a battery module thereof. Background Art

[0002] In the existing lithium battery manufacturing process, the battery core stacking structure mainly includes winding and lamination. Due to the power capacity density requirements of the battery, the general power type battery adopts a laminated structure. The main production process of the laminated battery is to die-cut the pole sheet roll into small pieces of a certain size, laminate the positive and negative pole pieces and the diaphragm, laminate the end glue, weld the positive and negative pole tabs, bend the pole tabs and weld the toes, and seal the top and side of the battery cell.

[0003] There are two existing ways to apply finishing glue to stacked sheets. One is a semi-automatic stacking machine, that is, the finishing glue is manually applied to fix the diaphragm after stacking; the other is a fully automatic stacking machine, which automatically applies finishing glue before the stacking is unloaded. However, both of these gluing methods have the risk of misalignment of the outer electrode sheet, that is, after the battery is affixed with the finishing glue, the outermost electrode sheet may be pulled out of position during the bending process. If the outermost negative electrode sheet is displaced, the outer negative electrode sheet and the empty foil area of ​​the positive electrode tab are in contact and short-circuited, or the outer electrode sheet is displaced and flush with the diaphragm, in the pressure forming process, the edge of the electrode sheet is in close contact with the empty foil of the tab under the action of pressure, resulting in internal short circuit and fire.

[0004] In order to solve the above problems, the Chinese patent with application number CN202120372020.7 discloses a stacked battery cell glue sticking head and a lithium battery stacking machine, the stacked battery cell glue sticking head includes a glue pressing head and two relatively arranged glue suction blocks, and an accommodating channel is formed between the two glue suction blocks. The glue pressing head is movably arranged in the accommodating channel, and the end face of the glue pressing head has a supporting area for supporting the battery cell. The supporting area is spaced from the edge of the glue pressing head so that the thickness of the glue pressing head is greater than the thickness of the battery cell. The glue pressing head is used to move relative to the glue suction block under the support of the battery cell. The glue suction block is provided with a supporting member, and the supporting member is used to support on both sides of the battery cell when the battery cell enters the accommodating channel.

[0005] The laminating cell glue sticking head provided by the laminating machine can effectively prevent the cell diaphragm from folding by sticking tape to the upper and lower surfaces of the cell so that the electrode and the diaphragm are in close contact, and the gluing effect is good. However, there is still a situation where the outermost electrode of the cell is easily pulled out of position during the bending process of the electrode ear.

[0006] Therefore, a battery structure is needed that has a better fixing effect on the outermost electrode sheet to ensure that the outermost electrode sheet of the battery cell will not be pulled out of position during the bending process of the electrode ear. Utility Model Content

[0007] The purpose of the present disclosure is to overcome the deficiencies in the prior art and to provide a laminated battery and a battery module thereof that can avoid misalignment of the outermost pole piece and has a better outermost pole piece fixing effect.

[0008] The purpose of this disclosure is achieved through the following technical solutions:

[0009] A laminated battery comprises a battery cell, wherein the battery cell comprises a negative electrode sheet, a separator and a positive electrode sheet stacked in sequence, and the number of the negative electrode sheet, the separator and the positive electrode sheet is multiple, wherein the outermost electrode sheets on both sides of the battery cell are respectively a first negative electrode sheet and a second negative electrode sheet, the separator abutting the first negative electrode sheet is a first separator, and the separator abutting the second negative electrode sheet is a second separator,

[0010] The stacked battery also includes a first adhesive layer and a second adhesive layer. A first adhesive portion is provided at one end of the first diaphragm, and the first adhesive portion is protruding from the first negative electrode sheet. A second adhesive portion is provided at one end of the second diaphragm, and the second adhesive portion is protruding from the second negative electrode sheet. The first adhesive layer is respectively adhered to the first negative electrode sheet and the first adhesive portion, and the second adhesive layer is respectively adhered to the second negative electrode sheet and the second adhesive portion.

[0011] In one embodiment, the first adhesive layer is rectangular; and / or,

[0012] The second adhesive layer is rectangular.

[0013] In one embodiment, the length of the first adhesive layer is 10 mm, and the width of the first adhesive layer is 10 mm.

[0014] In one embodiment, the length of the second adhesive layer is 10 mm, and the width of the second adhesive layer is 10 mm.

[0015] In one embodiment, the length of the first bonding portion is 1.5 mm.

[0016] In one embodiment, the length of the second bonding portion is 1.5 mm.

[0017] In one embodiment, a negative electrode ear is disposed at one end of each of the negative electrode sheets.

[0018] In one embodiment, a positive electrode tab is disposed at one end of each of the negative electrode sheets.

[0019] In one embodiment, the first negative electrode sheet is provided with a first connecting portion, the first adhesive layer is bonded to the first connecting portion, the length of the first connecting portion is 10 mm, and the width of the first connecting portion is 8 mm; and / or,

[0020] The second negative electrode sheet is provided with a second connecting portion, the second adhesive layer is adhered to the second connecting portion, the length of the second connecting portion is 10 mm, and the width of the second connecting portion is 8 mm.

[0021] A battery module comprises the laminated battery described in any one of the above embodiments.

[0022] Compared with the prior art, the present invention has at least the following advantages:

[0023] In the above-mentioned laminated battery, the negative electrode sheet, the diaphragm and the positive electrode sheet are stacked, and the outermost electrode sheets on both sides of the battery cell are respectively the first negative electrode sheet and the second negative electrode sheet, a first bonding portion is provided at one end of the first diaphragm, and the first bonding portion is protruding from the first negative electrode sheet, a second bonding portion is provided at one end of the second diaphragm, and the second bonding portion is protruding from the second negative electrode sheet, a first adhesive layer is respectively adhered to the first negative electrode sheet and the first adhesive portion, and a second adhesive layer is respectively adhered to the second negative electrode sheet and the second adhesive portion, so that the first negative electrode sheet and the first diaphragm are fixed by the first adhesive layer, and the second negative electrode sheet and the second diaphragm are fixed by the second adhesive layer, thereby improving the fixing effect of the outermost electrode sheet and ensuring that the outermost electrode sheet of the battery cell will not be pulled out of position during the bending process of the pole ear. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic structural diagram of a laminated battery structure according to an embodiment;

[0026] Figure 2 for Figure 1 The local enlarged schematic diagram of the laminated battery structure at A is shown;

[0027] Figure 3 for Figure 1 Another structural schematic diagram of the laminated battery structure is shown. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thoroughly and comprehensively understood.

[0029] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0031] The present disclosure provides a laminated battery, comprising a battery cell, wherein the battery cell comprises a negative electrode sheet, a separator and a positive electrode sheet stacked in sequence, and the number of the negative electrode sheets, the separator and the positive electrode sheets are all plural, wherein the outermost electrode sheets on both sides of the battery cell are respectively a first negative electrode sheet and a second negative electrode sheet, the separator abutting against the first negative electrode sheet is a first separator, and the separator abutting against the second negative electrode sheet is a second separator; the laminated battery also comprises a first adhesive layer and a second adhesive layer, a first adhesive portion is provided at one end of the first separator, and the first adhesive portion is protruding from the first negative electrode sheet, a second adhesive portion is provided at one end of the second separator, and the second adhesive portion is protruding from the second negative electrode sheet, the first adhesive layer is respectively adhered to the first negative electrode sheet and the first adhesive portion, and the second adhesive layer is respectively adhered to the second negative electrode sheet and the second adhesive portion.

[0032] In the above-mentioned laminated battery, the negative electrode sheet, the diaphragm and the positive electrode sheet are stacked, and the outermost electrode sheets on both sides of the battery cell are respectively the first negative electrode sheet and the second negative electrode sheet, a first bonding portion is provided at one end of the first diaphragm, and the first bonding portion is protruding from the first negative electrode sheet, a second bonding portion is provided at one end of the second diaphragm, and the second bonding portion is protruding from the second negative electrode sheet, a first adhesive layer is respectively adhered to the first negative electrode sheet and the first adhesive portion, and a second adhesive layer is respectively adhered to the second negative electrode sheet and the second adhesive portion, so that the first negative electrode sheet and the first diaphragm are fixed by the first adhesive layer, and the second negative electrode sheet and the second diaphragm are fixed by the second adhesive layer, thereby improving the fixing effect of the outermost electrode sheet and ensuring that the outermost electrode sheet of the battery cell will not be pulled out of position during the bending process of the pole ear.

[0033] In order to better understand the technical solutions and beneficial effects of the present invention, the present invention is further described in detail below in conjunction with specific embodiments:

[0034] like Figure 1 and Figure 2As shown, a laminated battery 10 of an embodiment includes a battery cell 20, and the battery cell 20 includes a negative electrode sheet 100, a separator 200 and a positive electrode sheet 300 stacked in sequence, and the number of the negative electrode sheet 100, the separator 200 and the positive electrode sheet 300 are multiple, wherein the outermost electrode sheets on both sides of the battery cell 20 are respectively a first negative electrode sheet 110 and a second negative electrode sheet 120, the separator abutting the first negative electrode sheet 110 is the first separator 210, and the separator abutting the second negative electrode sheet 120 is the second separator 220. Furthermore, the laminated battery 10 also includes a first adhesive layer 400 and a second adhesive layer 500, a first adhesive portion 211 is provided at one end of the first diaphragm 210, and the first adhesive portion 211 is protruding from the first negative electrode sheet 110, a second adhesive portion 221 is provided at one end of the second diaphragm 220, and the second adhesive portion 221 is protruding from the second negative electrode sheet 120, the first adhesive layer 400 is respectively adhered to the first negative electrode sheet 110 and the first adhesive portion 211, and the second adhesive layer 500 is respectively adhered to the second negative electrode sheet 120 and the second adhesive portion 221.

[0035] In this embodiment, the outermost electrodes on both sides of the battery cell are the first negative electrode sheet 110 and the second negative electrode sheet 120, the first separator 210 is in contact with the first negative electrode sheet 110, the second separator 220 is in contact with the second negative electrode sheet 120, the first separator 210 is provided with a first adhesive portion 211, the second separator 220 is provided with a second adhesive portion 221, the first adhesive layer 400 is respectively adhered to the first negative electrode sheet 110 and the first adhesive portion 211, and the second adhesive layer 500 is respectively adhered to the second negative electrode sheet 120 and the second adhesive portion 221. It can be understood that the first negative electrode sheet 110 and the first separator 210 are bonded and fixed by the first adhesive layer 400, and the second negative electrode sheet 120 and the second separator 220 are bonded and fixed by the second adhesive layer 500. This improves the fixing effect of the outermost electrodes on both sides of the battery cell, and because the first adhesive layer 400 is bonded to the side where the first negative electrode sheet 110 is welded to the pole tab, and the second adhesive layer 500 is bonded to the side where the second negative electrode sheet 120 is welded to the pole tab, it is ensured that the outermost electrode sheet of the battery cell will not be pulled out of position during the bending of the pole tab. Furthermore, after the first adhesive layer 400 and the second adhesive layer 500 are bonded to the battery cell, it is necessary to apply finishing glue to the outer periphery of the battery cell 20 to fix the overall structure of the battery cell 20 and to make each electrode sheet close to the diaphragm. In this embodiment, the first adhesive layer 400 is electrode sheet glue, and the second adhesive layer 500 is electrode sheet glue.

[0036] In the laminated battery 10, the negative electrode sheet 100, the separator 200 and the positive electrode sheet 300 are stacked, and the outermost electrode sheets on both sides of the battery cell 20 are respectively the first negative electrode sheet 110 and the second negative electrode sheet 120, one end of the first separator 210 is provided with a first adhesive portion 211, the first adhesive portion 211 is protrudingly arranged on the first negative electrode sheet 110, one end of the second separator 220 is provided with a second adhesive portion 221, the second adhesive portion 221 is protrudingly arranged on the second negative electrode sheet 120, and the first adhesive layer 40 0 is respectively bonded to the first negative electrode sheet 110 and the first bonding portion 211, and the second adhesive layer 400 is respectively bonded to the second negative electrode sheet 120 and the second adhesive portion 221, so that the first negative electrode sheet 110 and the first diaphragm 210 are fixed through the first adhesive layer 400, and the second negative electrode sheet 120 and the second diaphragm 220 are fixed through the second adhesive layer 500, thereby improving the fixing effect of the outermost electrode sheet and ensuring that the outermost electrode sheet of the battery cell 20 will not be pulled out of position during the bending process of the electrode ear.

[0037] like Figure 1 and Figure 2 As shown, in one embodiment, the first adhesive layer 400 is rectangular. It is understood that in other embodiments, the first adhesive layer 400 can also be circular, elliptical or other shapes.

[0038] like Figure 1 and Figure 2 As shown, in one embodiment, the second adhesive layer 500 is rectangular. It is understood that in other embodiments, the second adhesive layer 500 can also be circular, elliptical or other shapes.

[0039] like Figure 1 and Figure 2 As shown, in one embodiment, the length of the first adhesive layer 400 is 10mm-15mm, and the width of the first adhesive layer 400 is 10mm-15mm. In this embodiment, the length of the first adhesive layer 400 is 10mm, and the width of the first adhesive layer 400 is 10mm, that is, the first adhesive layer 400 is square, and a layer of electrode glue with a smaller length and width is bonded between the first negative electrode sheet 110 and the first diaphragm 210, so that the first negative electrode sheet 110 and the first diaphragm 210 can be fixed.

[0040] like Figure 1 and Figure 2As shown, in one embodiment, the length of the second adhesive layer 500 is 10mm-15mm, and the width of the second adhesive layer 500 is 10mm-15mm. In this embodiment, the length of the second adhesive layer 500 is 10mm, and the width of the second adhesive layer 500 is 10mm, that is, the second adhesive layer 500 is square, and a layer of electrode glue with a smaller length and width is bonded between the second electrode sheet 120 and the second diaphragm 220, so as to produce a fixing effect on the second negative electrode sheet 120 and the second diaphragm 220.

[0041] like Figure 1 and Figure 2 As shown, in one embodiment, the width of the first adhesive portion 211 is 1.5 mm-2.5 mm. In this embodiment, the width of the first adhesive portion 211 is 1.5 mm, that is, the width of the first adhesive layer 400 bonded to the first diaphragm 210 is 1.5 mm, so that the first adhesive layer 400 and the first diaphragm 210 are bonded.

[0042] like Figure 1 and Figure 2 As shown, in one embodiment, the width of the second adhesive portion 221 is 1.5 mm-2.5 mm. In this embodiment, the width of the second adhesive portion 221 is 1.5 mm, that is, the width of the second adhesive layer 500 bonded to the second diaphragm 220 is 1.5 mm, so that the second adhesive layer 500 and the second diaphragm 220 are bonded.

[0043] like Figure 1 and Figure 2 As shown, in one embodiment, one end of each negative electrode sheet 100 is provided with a negative electrode ear 101. It can be understood that in the subsequent bending ear process, all negative electrode ears 101 are bent, and in this process, due to the presence of the first adhesive layer 400 and the second adhesive layer 500, the outermost electrode sheet of the battery cell 20 will not be misaligned.

[0044] like Figure 1 and Figure 2 As shown, in one embodiment, a positive electrode tab 301 is provided at one end of each positive electrode sheet 300. It can be understood that in the subsequent bending tab process, all positive electrode tabs 301 are bent, and in this process, due to the presence of the first adhesive layer 400 and the second adhesive layer 500, the outermost electrode sheet of the battery cell 20 will not be misaligned.

[0045] like Figure 1 and Figure 2As shown, in one embodiment, the first negative electrode sheet 110 is provided with a first connecting portion 111, the first adhesive layer 400 is bonded to the first connecting portion 111, the length of the first connecting portion 111 is 10mm-15mm, and the width of the first connecting portion 111 is 7mm-8mm. In this embodiment, the length of the first connecting portion 111 is 10mm, the width of the first connecting portion 111 is 8mm, and the first connecting portion 111 is adjacent to the tab of the first negative electrode sheet 110 so that the first connecting portion 111 is bonded to the first adhesive layer 400, thereby avoiding the first negative electrode sheet 110 from being misaligned during the tab bending process.

[0046] like Figure 1 and Figure 2 As shown, in one embodiment, the second negative electrode sheet 120 is provided with a second connecting portion 121, the second adhesive layer 500 is bonded to the second connecting portion 121, the length of the second connecting portion 121 is 10mm-15mm, and the width of the second connecting portion 121 is 7mm-8mm. In this embodiment, the length of the second connecting portion 121 is 10mm, the width of the second connecting portion 121 is 8mm, and the second connecting portion 121 is adjacent to the tab of the second negative electrode sheet 120 so that the second connecting portion 121 is bonded to the second adhesive layer 500, thereby avoiding the misalignment of the first negative electrode sheet 110 during the tab bending process.

[0047] The present application also provides a battery module, comprising the laminated battery 10 of any of the above embodiments.

[0048] Compared with the prior art, the present invention has at least the following advantages:

[0049] In the laminated battery 10, the negative electrode sheet 100, the separator 200 and the positive electrode sheet 300 are stacked, and the outermost electrode sheets on both sides of the battery cell 20 are respectively the first negative electrode sheet 110 and the second negative electrode sheet 120, one end of the first separator 210 is provided with a first adhesive portion 211, the first adhesive portion 211 is protrudingly arranged on the first negative electrode sheet 110, one end of the second separator 220 is provided with a second adhesive portion 221, the second adhesive portion 221 is protrudingly arranged on the second negative electrode sheet 120, and the first adhesive layer 40 0 is respectively bonded to the first negative electrode sheet 110 and the first bonding portion 211, and the second adhesive layer 400 is respectively bonded to the second negative electrode sheet 120 and the second adhesive portion 221, so that the first negative electrode sheet 110 and the first diaphragm 210 are fixed through the first adhesive layer 400, and the second negative electrode sheet 120 and the second diaphragm 220 are fixed through the second adhesive layer 500, thereby improving the fixing effect of the outermost electrode sheet and ensuring that the outermost electrode sheet of the battery cell 20 will not be pulled out of position during the bending process of the electrode ear.

[0050] The above-mentioned embodiments only express several implementation methods of the present disclosure, 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 ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the patent of the present disclosure shall be based on the attached claims.

Claims

1. A laminated battery, comprising a battery cell, wherein the battery cell comprises a negative electrode sheet, a separator and a positive electrode sheet stacked in sequence, and the number of the negative electrode sheet, the separator and the positive electrode sheet is multiple, wherein: The outermost electrodes on both sides of the battery cell are respectively a first negative electrode and a second negative electrode, the diaphragm abutting the first negative electrode is a first diaphragm, and the diaphragm abutting the second negative electrode is a second diaphragm, characterized in that: The stacked battery also includes a first adhesive layer and a second adhesive layer. A first adhesive portion is provided at one end of the first diaphragm, and the first adhesive portion is protruding from the first negative electrode sheet. A second adhesive portion is provided at one end of the second diaphragm, and the second adhesive portion is protruding from the second negative electrode sheet. The first adhesive layer is respectively adhered to the first negative electrode sheet and the first adhesive portion, and the second adhesive layer is respectively adhered to the second negative electrode sheet and the second adhesive portion.

2. The laminated battery according to claim 1, characterized in that: The first adhesive layer is rectangular; and / or, The second adhesive layer is rectangular.

3. The laminated battery according to claim 1, characterized in that: The length of the first adhesive layer is 10mm-15mm, and the width of the first adhesive layer is 10mm-15mm.

4. The laminated battery according to claim 1, characterized in that: The length of the second adhesive layer is 10mm-15mm, and the width of the second adhesive layer is 10mm-15mm.

5. The laminated battery according to claim 1, characterized in that: The width of the first bonding portion is 1.5 mm-2.5 mm.

6. The laminated battery according to claim 1, characterized in that: The width of the second bonding portion is 1.5 mm-2.5 mm.

7. The laminated battery according to claim 1, characterized in that: One end of each negative electrode sheet is provided with a negative electrode ear.

8. The laminated battery according to claim 1, characterized in that: A positive electrode ear is provided at one end of each positive electrode sheet.

9. The laminated battery according to claim 1, characterized in that: The first negative electrode sheet is provided with a first connecting portion, the first adhesive layer is bonded to the first connecting portion, the length of the first connecting portion is 10 mm-15 mm, and the width of the first connecting portion is 7 mm-8 mm; and / or, The second negative electrode sheet is provided with a second connecting portion, the second adhesive layer is adhered to the second connecting portion, the length of the second connecting portion is 10mm-15mm, and the width of the second connecting portion is 7mm-8mm.

10. A battery module, characterized in that: A laminated battery comprising any one of claims 1-9.

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