Battery and battery module

Abstract

The utility model relates to the field of batteries, and discloses a battery and a battery module. The battery comprises a shell, a battery cell and an insulating sheet, a first shell plate of the shell is provided with a first lug boss, and the first lug boss is formed by extending from the first shell plate to the direction of the battery cell; the first protruding part is provided with a liquid injection hole. The insulating sheet is arranged between the battery cell and the first shell plate, the insulating sheet is provided with a deformation area, the deformation area is provided with an open hole, the deformation area forms a second convex part at the periphery of the first convex part, and the open hole is communicated with the liquid injection hole. The battery cell and the shell of the battery have relatively high insulativity, and meanwhile, the processing difficulty of the insulating sheet between the battery cell and the shell can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery and a battery module. BACKGROUND

[0002] In the process of assembling the battery, the battery cell is usually placed inside the shell to realize the packaging of the battery cell. After the packaging of the battery cell is completed, the electrolyte is injected into the shell to complete the production of the battery. Therefore, at least one side surface of the shell needs to be provided with a liquid injection hole. The hole wall of the liquid injection hole can extend from the surface of the shell to the direction of the battery cell to form a protruding part with the liquid injection hole to prevent the electrolyte from flowing back from the liquid injection hole during the liquid injection process. However, the protruding part can increase the risk of short circuit between the battery cell and the shell, causing internal short circuit and reducing the safety of the battery. CONTENT OF THE UTILITY MODEL

[0003] The present application discloses a battery and a battery module for realizing the insulation between the battery cell and the shell.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0005] In a first aspect, the present application provides a battery, which comprises a shell, a battery cell and an insulating sheet. The shell is used for packaging the battery cell, and a first shell plate of the shell is provided with a first protruding part which extends from the first shell plate to the direction of the battery cell. The first protruding part is provided with a liquid injection hole. The insulating sheet is arranged between the battery cell and the first shell plate, and the insulating sheet is provided with a deformation area which is provided with an opening. The deformation area forms a second protruding part around the outer periphery of the first protruding part, and the opening is in communication with the liquid injection hole.

[0006] The technical solutions of the present application have the following beneficial effects:

[0007] In the battery of the present application, the insulating sheet arranged between the shell and the battery cell is provided with a deformation area. In the process of assembly, the second protruding part is formed by the deformation of the deformation area itself. The surface of the second protruding part is provided with an opening which is in communication with the liquid injection hole. Therefore, in the battery of the present application, the deformation area can be pre-processed during the processing of the insulating sheet. During the assembly, the second protruding part which matches the first protruding part is formed by the deformation of the deformation area itself, so as to realize the insulation between the hole wall of the liquid injection hole and the battery cell. The deformation area is directly arranged on the insulating sheet and can be deformed during the assembly process. The size of the deformation area can be pre-set according to the height of the specific liquid injection hole. Therefore, on the basis of improving the insulation of the battery, the present application can reduce the processing difficulty of the insulating part. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 A structural schematic diagram of a battery is provided for the embodiments of the present application;

[0009] Figure 2 A structure schematic diagram of an insulation sheet before deformation according to an embodiment of the present application is provided.

[0010] Figure 3 A structure schematic diagram of an insulation sheet after deformation according to an embodiment is provided.

[0011] Reference Signs:

[0012] 10 - battery; 11 - shell; 11a - bottom plate; 110 - liquid injection hole; 111 - first protruding part; 12 - battery cell;

[0013] 121 - winding core hole; 13 - insulation sheet; 130 - opening; 131 - deformed area; 132 - insulation sheet body part;

[0014] 133 - second protruding part; 134 - crease. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0016] In a battery, a liquid injection hole is usually arranged on the shell of the battery to realize injection of electrolyte. Since insulation needs to be arranged between the shell and the battery cell, an insulation sheet needs to be arranged between the shell and the battery cell to ensure insulation between the battery cell and the shell. The following takes a cylindrical battery as an example to explain the structure of the battery.

[0017] Figure 1 A structure schematic diagram of a battery according to an embodiment of the present application is provided. As shown in Figure 1 , the battery 10 can be a cylindrical battery. The cylindrical battery includes a battery cell 12 and a shell 11, and the shell 11 is used to package the battery cell 12. The battery cell 12 can be a winding core, and the shape of the battery cell 12 can be a cylindrical battery cell or an elliptical cylindrical battery cell or other approximate cylindrical battery cell. Correspondingly, the shell 11 can be a cylindrical shell or an elliptical cylindrical shell, etc. The shell 11 can be an aluminum shell, a steel shell, etc. The material of the aluminum shell can be aluminum-manganese alloy, aluminum-magnesium alloy, etc. The material of the steel shell can be stainless steel, nickel-plated steel, etc.

[0018] Referring to Figure 1 , the shell 11 of the battery 10 can include a top cover, a bottom plate 11a and a side plate. The top cover and the bottom plate 11a are arranged opposite to each other, and the side plate is arranged between the top cover and the bottom plate 11a. The bottom plate 11a can be a circular bottom plate 11a. The top cover can be a circular top cover.

[0019] The first shell plate of the housing 11 is provided with a first protrusion 111, which extends from the first shell plate toward the battery cell 12; the first protrusion 111 is provided with a liquid injection hole 110.

[0020] like Figure 1 As shown, in one embodiment of this application, the first shell plate may be the bottom plate 11a of the shell 11. In one embodiment, the injection hole 110 may be provided on the bottom plate 11a of the shell 11. The first protrusion 111 is a cylindrical protrusion. The first protrusion 111 may be formed by protruding from the bottom plate 11a toward the cell 12. The injection hole 110 is provided on the first protrusion 111. By providing the first protrusion 111, the electrolyte injected into the shell 11 can be prevented from flowing out from the injection hole 110. The first protrusion 111 may be provided corresponding to the axis of the cell 12. At the axis position of the cell 12, the cell 12 may have a certain gap reserved, thereby preventing the cell 12 from colliding with the first protrusion 111.

[0021] To prevent short circuits between the battery cell 12 and the base plate 11a, and between the battery cell 12 and the first protrusion 111, an insulating sheet 13 can be provided between the battery cell 12 and the base plate 11a, and between the battery cell 12 and the first protrusion 111. The insulating sheet 13 can be made of an organic polymer material, such as polyethylene (PE) or polypropylene (PP).

[0022] like Figure 1 As shown, in battery 10, the insulating sheet 13 can be disposed near the base plate 11a or near the cell 12. An adhesive layer can be disposed on the side of the insulating sheet 13 facing the base plate 11a, allowing the insulating sheet 13 to be bonded to the base plate 11a. Alternatively, an adhesive layer can be disposed on the side of the insulating sheet 13 facing the cell 12, allowing the insulating sheet 13 to be bonded to the cell 12. Alternatively, adhesive layers can be disposed on both sides of the insulating sheet 13, allowing the insulating sheet 13 to be bonded to both the base plate 11a and the cell 13 simultaneously. The adhesive layer can be disposed in a portion or all of the insulating sheet body portion 132. In one embodiment, the area of ​​the adhesive layer is greater than or equal to 10% of the area of ​​the insulating sheet body portion 132, such as 10-60%, to ensure bonding strength and mobility during the mounting process. The surface of the second protrusion is not provided with an adhesive layer to avoid affecting deformation of the deformation area.

[0023] Figure 2 This is a schematic diagram of the structure of an insulating sheet before deformation, according to one embodiment. Figure 2 As shown, the insulating sheet 13 includes an insulating sheet body portion 132 and a deformation region 131, the deformation region 131 being provided with an opening 130. Figure 3 This is a schematic diagram of the deformed structure of an insulating sheet according to one embodiment. See also... Figures 1 to 3The deformed region 131 is formed with a second protrusion 133 around the outer periphery of the first protrusion 111, and the opening 130 is in communication with the liquid injection hole 110. In one embodiment, the opening 130 of the deformed region 131 can be coaxially arranged with the liquid injection hole 110.

[0024] To ensure that the first protrusion 111 and the second protrusion 133 are in sufficient contact and the gap between them is reduced, in one embodiment, the ratio of the inner diameter of the second protrusion 133 to the outer diameter of the first protrusion 111 is 1-1.8. Exemplarily, the ratio of the inner diameter of the second protrusion 133 to the outer diameter of the first protrusion 111 can be 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, or 1.8 or any value between any two of the above values.

[0025] The insulating sheet body portion 132 is arranged between the bottom plate 11a of the housing 11 and the battery cell 12 and has a sheet structure. The junction of the insulating sheet body portion 132 and the deformed region 131 can be provided with a crease 134 or an indentation or a notch to allow the deformed region 131 to deform along the preset region range when deformed.

[0026] The deformed region 131 of the insulating sheet 13 can be a thinned region, and the thickness of the deformed region 131 is less than the thickness of the insulating sheet body portion 132 arranged between the bottom plate 11a and the battery cell 12. Since the second protrusion 133 is formed by the deformed region 131, the thickness of the second protrusion 133 is less than the thickness of the insulating sheet body portion 132. By thinning, the deformed region 131 is more likely to deform.

[0027] In one embodiment of the present application, the thickness of the insulating sheet body portion 132 is 0.15-0.35 mm, and the thickness of the deformed region 131 can be 0.14-0.32 mm. By controlling the thickness of the insulating sheet body portion 132 and the deformed region 131, the insulation between the battery cell 12 and the housing 11 can be further improved, and the deformability of the deformed region 131 can be ensured. Exemplarily, the thickness of the insulating sheet body portion 132 can be 0.15 mm, 0.18 mm, 0.20 mm, 0.22 mm, 0.25 mm, 0.30 mm, 0.32 mm, 0.35 mm, or any value between any two of the above values. The thickness of the deformed region 131 can be 0.14 mm, 0.18 mm, 0.20 mm, 0.22 mm, 0.25 mm, 0.30 mm, or 0.32 mm, or any value between any two of the above values.

[0028] Continuing to refer to Figure 1The ratio of the height of the second protruding portion 133 to the height of the first protruding portion 111 is 1-1.5 in the direction from the first shell plate to the battery cell 12. The height of the second protruding portion 133 is higher than the height of the first protruding portion 111 in the direction from the bottom plate 11a to the battery cell 12, so as to ensure the insulation between the bottom plate 11a and the battery cell 12. For example, the ratio of the height of the second protruding portion 133 to the height of the first protruding portion 111 can be 1, 1.1, 1.2, 1.3, 1.4, or 1.5, or any value between any two of the above values.

[0029] In an embodiment of the present application, the insulating sheet 13 can be an elastic insulating sheet 13. When the insulating sheet 13 is an elastic insulating sheet 13, the radial dimension of the second protruding portion 133 is equal in the direction from the bottom plate 11a to the battery cell 12. The material of the elastic insulating sheet can be synthetic rubber, natural rubber, or polyurethane PU, etc.

[0030] In another embodiment of the present application, the insulating sheet 13 can be a rigid insulating sheet 13. When the insulating sheet 13 is a rigid insulating sheet 13, the radial dimension of the second protruding portion 133 gradually decreases in the direction from the bottom plate 11a to the battery cell 12. The material of the rigid insulating sheet can be PE or PP, etc.

[0031] Referring to Figure 2 The deformed area 131 of the insulating sheet 13 can be provided with at least two creases 134. Each crease 134 can be arranged along the radial direction of the opening. For example, the number of creases 134 can be 2, 3, 4, 6, 8, 10, or more. The plurality of creases 134 are arranged at intervals along the circumferential direction of the deformed area 131. In an embodiment, the plurality of creases 134 can be arranged at equal intervals. By arranging the creases 134, the deformed area 131 can be folded along the creases 134 during deformation.

[0032] Referring to Figure 2 and Figure 3 After the deformed area 131 of the insulating sheet 13 is deformed to form the second protruding portion 133, the creases 134 are arranged at intervals along the circumferential direction of the second protruding portion 133. At this time, the number of creases 134 arranged on the second protruding portion 133 is greater than or equal to two. The arrangement of the creases 134 can improve the structural rigidity of the deformed area 131, reduce the problem of edge collapse or warping during folding of the deformed area 131, and play a guiding role during deformation.

[0033] In an embodiment, the thickness of the creases 134 is less than the thickness of the second protruding portion 133. The creases 134 can be indentations or notches to form traces that are easy to deform, so that the deformed area 131 deforms along the creases 134 during folding.

[0034] In the assembling process, the insulating sheet 13 can be directly assembled in the shell 11, and the deformed area 131 of the insulating sheet 13 is lifted by the first protruding part 111 of the shell 11 to form the second protruding part 133. Alternatively, the insulating sheet 13 can be bonded to the bottom surface of the battery cell 12, and the deformed area 131 of the insulating sheet 13 is lifted by the first protruding part 111 of the shell 11 to form the second protruding part 133 when the battery cell 12 is assembled in the shell.

[0035] In one embodiment, the battery cell 12 includes a battery cell body, a positive electrode tab, and a negative electrode tab, the positive electrode tab and the negative electrode tab are led out from the same side of the battery cell body; one of the positive electrode tab and the negative electrode tab is electrically connected to the pole assembly of the battery, and the other is electrically connected to the shell; the insulating sheet is arranged on the side of the battery cell away from the positive electrode tab and the negative electrode tab.

[0036] The positive electrode tab and the negative electrode tab are led out from the same side of the battery cell. In the embodiment of the application, the positive electrode tab and the negative electrode tab are led out from the top of the battery cell, and the shell is connected to one of the positive electrode tab and the negative electrode tab as the leading pole. In order to ensure the insulation between the shell and the battery cell, it is necessary to achieve the insulation between the battery cell and the shell. An insulating sheet is arranged between the bottom of the battery cell and the bottom shell on the other side of the battery cell where no electrode tab is led out, and the insulating sheet serves as the insulation between the battery cell and the shell.

[0037] The positive electrode tab and the negative electrode tab (hereinafter referred to as the electrode tab) are led out from the battery cell body. Specifically, the electrode tab can be cut from the current collector of the electrode tab of the battery cell, or can be a separate conductive piece. The material of the electrode tab can be aluminum, copper, nickel, stainless steel, etc. The function of the electrode tab is to transmit the current of the battery cell.

[0038] The pole assembly is used to realize the electrical connection between the battery and the external circuit. The electrode tab and the pole assembly can be directly electrically connected, or indirectly connected through the current collector disc. The connection between the electrode tab and the shell can also be direct electrical connection with the shell, or indirect electrical connection with the shell through the current collector disc.

[0039] In addition, the battery cell includes a positive electrode tab and a negative electrode tab. The positive electrode tab is connected to the positive electrode tab, and the negative electrode tab is connected to the negative electrode tab.

[0040] The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, and the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The positive electrode current collector is not particularly limited as long as it has conductivity without causing adverse chemical changes in the battery, and for example, stainless steel, aluminum, nickel, titanium, baked carbon, or aluminum or stainless steel treated on the surface with one of carbon, nickel, titanium, silver, etc. can be used; the negative electrode current collector can be made of copper, stainless steel, nickel, titanium, etc. In specific embodiments, the positive electrode can be made of aluminum, and the negative electrode can be made of copper. The positive electrode active material layer includes a positive electrode active material, and the positive electrode active material includes nickel-cobalt-manganese ternary material, lithium iron phosphate material, lithium manganese iron phosphate material, etc.; the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material includes artificial graphite, natural graphite, silicon-based material, etc.

[0041] With reference to the foregoing Figure 1 In one embodiment, the battery cell 12 includes a winding core hole 121, the first protruding part 111 is at least partially inserted into the winding core hole 121, the liquid injection hole 110 and the winding core hole 121 are oppositely arranged, and the second protruding part 133 is located between the first protruding part 111 and the hole wall of the winding core hole 121.

[0042] The first protruding part 111 is at least partially inserted into the winding core hole 121, and the liquid injection hole 110 and the winding core hole 121 are oppositely arranged. When electrolyte is injected, the electrolyte can be better injected into the position of the winding core hole 121 and diffused and infiltrated from the position of the winding core hole 121. At the same time, the opposite arrangement of the liquid injection hole 110 and the winding core hole 121 also avoids direct flushing of the electrode sheet by the electrolyte during injection. The deformed area of the insulating sheet 13 is arranged around the outside of the first protruding part 111 during assembly, which plays a role of insulation protection for the first protruding part 111 and avoids short circuit between the battery cell 12 and the first protruding part 111.

[0043] Compared with the structure in which the protruding part corresponding to the liquid injection hole is directly formed on the insulating sheet by a stretching process, in the battery of the embodiment of the present application, the height of the second protruding part can be randomly set as needed by changing the size of the deformed area, which is not limited by the process, facilitating the processing of a higher second protruding part so that the second protruding part exceeds the height of the liquid injection hole, and further realizing effective insulation between the second protruding part and the battery cell.

[0044] Based on the same technical purpose, the embodiment of the present application also provides a battery module including the battery of the embodiment of the present application. The number of batteries in the battery module can be multiple. The multiple batteries can be connected in series or in parallel.

[0045] It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application cover the modifications and variations of this application provided they come within the scope of the appended claims and their equivalents.

Claims

1. A battery, characterized in that, include: Battery cell; A housing for accommodating the battery cell, wherein a first shell plate of the housing is provided with a first protrusion extending from the first shell plate toward the battery cell; the first protrusion is provided with a liquid injection hole; An insulating sheet is disposed between the battery cell and the first shell plate. The insulating sheet has a deformable region with an opening. A second protrusion is formed around the outer periphery of the first protrusion in the deformable region. The opening communicates with the liquid injection hole.

2. The battery according to claim 1, characterized in that, Along the direction from the first shell plate to the battery cell, the ratio of the height of the second protrusion to the height of the first protrusion is 1-1.

5.

3. The battery according to claim 1, characterized in that, Along the direction from the first shell plate to the battery cell, the radial dimension of the second protrusion is the same or the radial dimension gradually decreases.

4. The battery according to claim 1, characterized in that, The second protrusion has at least two creases, which are spaced apart circumferentially along the second protrusion.

5. The battery according to claim 4, characterized in that, The thickness of the crease is less than the thickness of the second protrusion.

6. The battery according to any one of claims 1-5, characterized in that, The thickness of the insulating sheet is 0.15-0.35 mm.

7. The battery according to claim 6, characterized in that, The thickness of the second protrusion is less than the thickness of the insulating sheet between the first shell plate and the battery cell.

8. The battery according to any one of claims 1-5, characterized in that, The ratio of the inner diameter of the second protrusion to the outer diameter of the first protrusion is 1-1.

8.

9. The battery according to any one of claims 1-5, characterized in that, An adhesive layer is provided on the side of the insulating sheet facing the first shell plate, and / or, an adhesive layer is provided on the side of the insulating sheet facing the battery cell.

10. The battery according to claim 9, characterized in that, The adhesive layer is not provided on the surface of the second protrusion.

11. The battery according to any one of claims 1-5, characterized in that, The battery is a cylindrical battery; the cell includes a cell body, a positive tab, and a negative tab, the positive tab and the negative tab being led out from the same side of the cell body; one of the positive tab and the negative tab is electrically connected to the terminal assembly of the battery, and the other is electrically connected to the casing; the insulating sheet is disposed on the side of the cell away from the leading-out positive tab and the negative tab.

12. The battery according to claim 11, characterized in that, The battery cell includes a core hole, the first protrusion extends at least partially into the core hole, the liquid injection hole and the core hole are disposed opposite to each other, and the second protrusion is located between the first protrusion and the hole wall of the core hole.

13. A battery module, characterized in that, Includes the battery as described in any one of claims 1-12.

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