Battery preparation method and battery

Abstract

Provided in the present application is a battery preparation method. A battery comprises battery cells, a battery casing and at least one battery cover plate. The battery cover plate comprises a first cover plate and terminal post blocks, wherein a first mounting hole is provided in the first cover plate. The battery preparation method comprises the following steps: step 1, welding tabs at ends of battery cells, and placing the battery cells into a battery casing; and step 2, welding a first cover plate to the battery casing, welding the tabs to terminal post blocks, and welding the terminal post blocks to the first cover plate. In the present application, a conventional cover plate structure is split into the first cover plate and the terminal post blocks; when a tab welding operation is performed, the first cover plate can be welded in advance to achieve the effects of limiting and fixing the battery cells in the battery casing in advance, and the tabs and second cover plates are then welded; therefore, there is no need to design an additional tab bending space due to the problem of battery cell displacement caused by force conduction by the tabs, such that the volume of the battery cells inside the battery is increased, the battery cells have higher internal-space utilization rates, and the volumetric energy density is improved by 0.5%-5%.

Description

Battery preparation method and battery

[0001] This application is based on the Chinese invention application with application number 202410128129.4 filed on January 30, 2024, entitled “A method for preparing a battery and a battery”, and claims priority. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a battery preparation method and a battery. Background Art

[0003] The design of the internal structure of the battery cell is the key to the design of the battery cell. It is necessary to ensure the internal insulation and safety as well as the energy density of the battery cell. The traditional battery cell design has many internal structural parts, occupies a large space, has a relatively high manufacturing cost, and the energy density improvement is also limited to a certain extent; in particular, the existing battery installation usually requires the battery cell to be placed in the shell, the battery cell's tabs are welded to the cover plate, and then the cover plate and the shell are welded together. Based on the actual welding operation needs, the cover plate and the shell need to be flipped at a certain angle to expose the welding surface, and then the tabs are welded, and then the cover plate is flipped again to cover the opening of the shell and welded together. This structure requires a longer length of tabs to facilitate the flipping space requirements of the cover plate. The longer the tabs are, the higher the risk of short circuits. At the same time, the shell needs to be set More tab space is reserved, resulting in a decrease in energy density. On the other hand, when installing a battery housing structure that requires a cover plate at both ends for sealing, a larger tab space is required at both ends of the battery housing, which is usually larger than the actual space required for the tab to fold. This is because when the cover plate at one end is welded, the folded tab can easily cause the battery cell inside the battery housing to shift through force transmission, thereby affecting the alignment of the cover plate and the tab at the other end. Therefore, a larger tab space is required to avoid the problem of cell displacement caused by the sealing welding process of the cover plate at one end, but this arrangement also leads to a decrease in battery energy density. Therefore, how to overcome the above-mentioned technical problems and defects has become a key issue that needs to be solved. Summary of the Invention

[0004] In response to the problems that existing battery cells have many internal structural parts, occupy a large space, have relatively high manufacturing costs, and have low energy density, the present application provides a battery preparation method and a battery.

[0005] The technical solutions adopted by this application to solve the above technical problems are as follows:

[0006] On one hand, the present application provides a battery preparation method, comprising the following steps:

[0007] Step 1: Place the battery cell into the battery casing;

[0008] Step 2: Welding and sealing the first cover plate to the battery housing, the first cover plate is used to limit the battery cell in the battery housing, the first cover plate is designed with a first mounting hole, and the tab of the battery cell is led out through the first mounting hole of the first cover plate;

[0009] Step 3: Place the pole block outside the first mounting hole. The pole block includes a second cover plate and a pole arranged on the second cover plate. Electrically connect the pole tab to the pole. Flip the second cover plate so that it is engaged with the first mounting hole and weld it to fix.

[0010] Optionally, before step 1, a tab is welded to at least one end of the battery cell, a tab protective adhesive layer is affixed to the position where the tab is connected to the battery cell, and the end of the tab is exposed to form a first welding area for welding to the pole.

[0011] Optionally, the tab protection adhesive layer is selected from one or more of a PP adhesive layer, a PE adhesive layer, a polyimide adhesive layer or an epoxy resin adhesive layer.

[0012] Optionally, the battery cells in step 1 are multiple, and the multiple battery cells are stacked to form a battery cell group.

[0013] Optionally, step 1 includes the following steps:

[0014] Two spacers are respectively arranged at the two ends of the battery cell, wherein the spacers are provided with a groove, and a first through hole is opened at the bottom of the groove, and the tabs at the ends of the battery cell pass through the first through hole and extend to the outside of the first through hole;

[0015] Apply two surface adhesives to the two sides of the battery cell respectively, place two side panels on the other two sides of the battery cell respectively, clamp the side panels and spacers end to end and form a battery cell protection structure together with the surface adhesive, fix the battery cell in the battery cell protection structure, and place the battery cell and the battery cell protection structure together in the battery casing.

[0016] Optionally, both ends of the battery housing are opened, and there are two battery covers, and step 2 includes the following steps:

[0017] The two first cover plates are respectively buckled, pressed and welded to the two openings of the battery housing, the pole tabs are welded to the pole blocks, and the two pole blocks are independently buckled and welded to the first mounting holes of the two first cover plates.

[0018] Optionally, one end of the battery housing is open, the other end of the battery housing is provided with a second mounting hole, one first cover plate is provided, and two terminal blocks are provided, and step 2 includes the following steps:

[0019] The first cover plate is snap-fitted, pressed and welded to the opening of the battery shell, the electrode tab is welded to the electrode block, one of the electrode blocks is snap-fitted and welded to the first mounting hole of the first cover plate, and the other electrode block is snap-fitted and welded to the second mounting hole at the end of the battery shell.

[0020] Optionally, the pole block includes a pole plate, a first insulating layer, a first cover plate, a pole, a second insulating layer and a pole connecting piece, the pole plate and the pole connecting piece are respectively arranged on both sides of the first cover plate, the first insulating layer is arranged between the pole plate and the first cover plate, the second insulating layer is arranged between the first cover plate and the pole connecting piece, a second through hole is provided on the first cover plate, the pole plate is provided with a third through hole at a position corresponding to the first through hole, the first insulating layer is provided with a fourth through hole at a position corresponding to the first through hole, the pole connecting piece is provided with a fifth through hole at a position corresponding to the first through hole, the second insulating layer is provided with a sixth through hole at a position corresponding to the first through hole, and the pole is inserted into the third through hole, the fourth through hole, the second through hole, the sixth through hole and the fifth through hole in sequence.

[0021] Optionally, a second welding area is provided on a side of the pole connecting piece close to the pole tab, and the second welding area of ​​the pole connecting piece is welded to the first welding area of ​​the adjacent pole tab.

[0022] On one hand, the present application provides a battery prepared by the battery preparation method described above.

[0023] According to the battery cover provided by the present application, the traditional cover structure is split into two large blocks, namely the first cover and the pole block, the pole block is provided with a second cover, the pole is fixed on the second cover, the second cover is inserted into the first mounting hole and connected to the first cover, and the lower end of the pole block is used for welding with the pole ear. The cover structure of the present application is simple, with few structural parts, simple manufacturing process and relatively low manufacturing cost; and by splitting the traditional cover structure into the first cover and the pole block, compared with the existing battery cover structure, the battery cell structure of the present application can pre-weld the first cover when performing the pole ear welding operation, which plays a role of pre-limiting and fixing the battery cell in the battery shell, and the pole ear of the battery cell passes through the first mounting hole, and the displacement of the battery cell will not be caused by the bending force transmission of the pole ear, and then the welding between the pole ear and the second cover is performed, so there is no need to conduct force due to the pole ear. The problem of cell displacement is caused by designing additional tab bending space, thereby effectively improving the overall energy density of the battery. At the same time, after welding the tab, it is only necessary to flip the second cover plate with a smaller area, and there is no need to flip the first cover plate. The flipping space required for the second cover plate with a smaller area is smaller than that of the first cover plate. Therefore, when the tab is welded to the pole block, the tab needs to extend to a shorter length, that is, the overall tab length is smaller, and the space reserved for folding the tab inside the battery cell is smaller, which increases the volume of the battery cell, improves the internal space utilization of the battery cell, and increases the volume energy density by 0.5%-5%. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 is a schematic structural diagram of welding a battery cell and a tab provided in one embodiment of the present application;

[0025] FIG2 is a schematic structural diagram of a tab provided in one embodiment of the present application;

[0026] FIG3 is a schematic structural diagram of a tab-attached tab protective adhesive layer provided in one embodiment of the present application;

[0027] FIG4 is a schematic structural diagram of a winding core assembly provided in one embodiment of the present application;

[0028] FIG5 is a schematic diagram of the assembly structure of the winding core group, the spacer ring, and the side plate provided in one embodiment of the present application;

[0029] FIG6 is a partial enlarged schematic diagram of A in FIG5 ;

[0030] FIG7 is a schematic diagram of the structure of applying adhesive to the surface of the core assembly according to one embodiment of the present application;

[0031] FIG8 is a schematic structural diagram of a core assembly provided in an embodiment of the present application placed in a battery housing;

[0032] FIG9 is a schematic structural diagram of a first cover plate and a battery housing after welding according to an embodiment of the present application;

[0033] FIG10 is a schematic structural diagram of welding a pole block and a pole tab according to an embodiment of the present application;

[0034] FIG11 is a schematic structural diagram of welding a pole block and a first cover plate according to an embodiment of the present application;

[0035] FIG12 is a cross-sectional view of a pole block provided in one embodiment of the present application;

[0036] FIG13 is a cross-sectional view of a battery provided in one embodiment of the present application;

[0037] The reference numerals in the drawings of the specification are as follows:

[0038] 1-battery cover; 11-first cover; 111-first mounting hole; 112-recess; 12-pole block; 121-pole plate; 1211-third through hole; 122-first insulating layer; 1221-fourth through hole; 123-second cover; 1231-second through hole; 1232-boss; 124-pole; 125-second insulating layer; 1251-sixth through hole; 126-pole connecting piece; 1261-fifth through hole; 2-battery cell; 21-battery cell protective adhesive layer; 3-battery housing; 31-second mounting hole; 4-tab; 41-tab protective adhesive layer; 42-first welding area; 5-battery cell protection structure; 51-spacer; 511-groove; 512-first through hole; 513-slot; 52-side panel; 521-block; 53-surface adhesive. DETAILED DESCRIPTION

[0039] In order to make the technical problems, technical solutions and beneficial effects solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0040] In the description of this application, it should be understood that the terms "lateral," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0041] In the description of this application, it should be noted that, unless otherwise specified or limited, the term "connection" should be understood in a broad sense. For example, it can mean a fixed connection, a detachable connection, or an integral connection; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean internal communication between two components. For those skilled in the art, the specific meanings of the above terms in this application can be understood by those skilled in the art in specific circumstances.

[0042] As shown in Figures 1-13, in one embodiment, the present application provides a battery preparation method, including the following steps:

[0043] Step 1: Place the battery cell 2 into the battery housing 3;

[0044] Step 2: Weld the first cover plate 11 and the battery housing 3 to seal. The first cover plate 11 limits the battery cell 2 in the battery housing 3. The first cover plate 11 is designed with a first mounting hole 111, and the tab 4 of the battery cell 2 is led out through the first mounting hole 111 of the first cover plate 11.

[0045] Step 3: Place the pole block 12 outside the first mounting hole 111. The pole block 12 includes a second cover plate 123 and a pole 124 provided on the second cover plate 123. Electrically connect the pole lug 4 to the pole 124. Flip the second cover plate 123 so that it is engaged with the first mounting hole 111 and welded to fix.

[0046] The internal structure of existing battery cells is relatively complex, with many structural parts, complicated manufacturing processes and relatively high manufacturing costs. In addition, the internal structure occupies a certain space, and the volume energy density of the battery cells is relatively low.

[0047] The present application is to split the traditional battery cover plate 1 structure into two large blocks, namely the first cover plate 11 and the pole block 12. The pole block 12 is provided with a second cover plate 123. The pole 124 is fixed on the second cover plate 123. The second cover plate 123 is inserted into the first mounting hole 111 and connected to the first cover plate 11. The lower end of the pole block 12 is used for welding with the pole lug 4. The battery cover plate 1 of the present application has a simple structure, few structural parts, a simple manufacturing process, and a relatively low manufacturing cost. Moreover, by splitting the traditional cover plate structure into the first cover plate 11 and the pole block 12, compared with the existing battery cover plate 1 structure, the battery cell structure of the present application can pre-weld the first cover plate 11 when performing the pole lug 4 welding operation, which plays a role in pre-limiting and fixing the battery cell in the battery shell 3. The pole lug 4 of the battery cell passes through the first mounting hole 111, and the bending force transmission of the pole lug 4 will not cause the displacement of the battery cell. Then, welding between the pole lug 4 and the second cover plate 123 is performed. Therefore, there is no need to cause the battery cell to be displaced due to the force transmission of the pole lug 4. The problem of shifting the pole ear 4 is solved by designing an additional bending space for the pole ear 4, thereby effectively improving the overall energy density of the battery. At the same time, after welding the pole ear 4, it is only necessary to flip the second cover plate 123 with a smaller area, and there is no need to flip the first cover plate 11. The first cover plate 11 can be welded in advance, and the flipping space required for the pole block 12 with a smaller area is smaller than that of the first cover plate 11. Therefore, when the pole ear 4 is welded to the pole block 12, the pole ear 4 needs to extend to a shorter length, that is, the overall pole ear 4 length is smaller, and the space for folding the pole ear 4 that needs to be reserved inside the battery cell is smaller, which increases the volume of the battery cell 2 inside the battery, and the internal space utilization of the battery cell is higher, and the volume energy density is increased by 0.5%-5%.

[0048] As shown in Figures 2-3, in one embodiment, before step 1, a tab 4 is welded to at least one end of the battery cell 2, and a tab protective adhesive layer 41 is affixed to the position where the tab 4 is connected to the battery cell 2, and the end of the tab 4 is exposed to form a first welding area 42 for welding to the pole 124.

[0049] As shown in FIG1-2 , specifically, one tab 4 is welded to each of the two ends of the battery cell 2 by ultrasonic welding, or two tabs 4 are welded to one end of the battery cell 2 by ultrasonic welding.

[0050] Specifically, the minimum distance between one end of the tab protective adhesive layer 41 and the first welding area 42 is 2-10 mm. Specifically, the distance between the tab protective adhesive layer 41 and the first welding area 42 is any point value of 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm or 10 mm or a range value consisting of any two point values.

[0051] In a preferred embodiment, the minimum distance between the tab protective adhesive layer 41 and the first welding area 42 is 5 mm.

[0052] Furthermore, the tab protective adhesive layer 43 is rectangular, and the other end of the tab protective adhesive layer 43 extends to the surface of the battery cell 2. Both side edges of the tab protective adhesive layer 43 extend to the outside of the tab 4, thereby fully covering the tab 4. The tab protective adhesive layer 43 is made of insulating material, so that after the tab 4 is connected to the pole block 12, the tab 4 is prevented from contacting with other parts, thereby preventing the battery cell from short-circuiting.

[0053] The extension length of the tab protective adhesive layer 43 on the surface of the battery cell 2 is 10-20 mm. Specifically, the extension length of the tab protective adhesive layer 41 on the surface of the battery cell 2 is any point value among 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm or 20 mm, or a range value consisting of any two point values.

[0054] The length range of the tab protective rubber layer 43 extending from the side of the tab 4 on both sides is each selected from 5-15 mm. Specifically, the length range of the tab protective rubber layer 43 extending from the side of the tab 4 on both sides is each selected from any point value among 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm or 15 mm or a range value consisting of any two point values.

[0055] In one embodiment, the tab protection adhesive layer 43 is selected from one or more of a PP adhesive layer, a PE adhesive layer, a polyimide adhesive layer, and an epoxy resin adhesive layer.

[0056] The tab protective adhesive layer 43 is made of insulating material, which can provide good insulation and has high viscosity, so as to prevent the tab 4 from contacting other parts after the tab 4 is connected to the pole connecting piece 126, thereby preventing the battery cell from short circuiting.

[0057] As shown in FIG. 4 , in one embodiment, a plurality of battery cells 2 are provided in step 1 , and the plurality of battery cells 2 are stacked to form a battery cell group.

[0058] Specifically, a cell protection adhesive layer 21 is adhered to the outer surface of the cell 2 .

[0059] Specifically, the cell protection adhesive layer 21 fixes the cell group by being fixed at one or both ends of the cell group. Multiple cell protection adhesive layers 21 can be set at one end of the cell group. When the cell protection adhesive layer 21 adheres to the end of the cell group, the cell protection adhesive layer 21 does not contact the tab 4, thereby fixing multiple battery cells 2 at the end.

[0060] Furthermore, the cell protection adhesive layer 21 can also be fixed on the outer surface of the cell group by winding. The cell protection adhesive layer 21 can be provided with multiple strips that are wound together at different positions on the outer surface of the cell group, thereby fixing the core group, which is conducive to subsequently fixing the core group in the cell protection structure 5.

[0061] As shown in Figures 5-7, in one embodiment, step 1 includes the following steps:

[0062] Two spacers 51 are respectively arranged at the two ends of the battery cell 2. A groove 511 is formed on the spacer 51. A first through hole 512 is opened at the bottom of the groove 511. The tab 4 at the end of the battery cell 2 passes through the first through hole 512 and extends to the outside of the first through hole 512.

[0063] Apply two surface adhesives 53 to both sides of the battery cell 2 respectively, place two side panels 52 on the other two sides of the battery cell 2 respectively, and clamp the side panels 52 and the spacer 51 end to end together with the surface adhesive 53 to form a battery cell protection structure 5, fix the battery cell 2 in the battery cell protection structure 5, and place the battery cell 2 and the battery cell protection structure 5 together in the battery shell 3.

[0064] Specifically, the battery includes a cell protection structure 5, which includes two spacers 51, two side plates 52 and two surface adhesives 53. The two side plates 52 are located on the narrower side of the cross section of the cell 2, and the two surface adhesives 53 are located on the wider side of the cross section of the cell 2. A groove 511 is provided on the spacer 51, and a first through hole 512 is provided at the bottom of the groove 511. A plurality of card slots 513 are provided on at least two opposite sides of the spacer 51. The side plates 52 are arranged opposite to each other, and a plurality of card blocks 521 are provided at both ends of the side plates 52. The two spacers 51 are respectively arranged at the two ends of the cell 2, and the tabs 4 at the ends of the cell 2 pass through the first through hole 512 and extend to the outside of the first through hole 512.

[0065] The blocks 521 on the side panels 52 are snapped into engagement with the slots 513 on the spacer 51 one by one, and the two surface adhesives 53 are respectively applied to the two larger surfaces of the battery cell 2, and the battery cell 2 or battery cell group is fixed in the battery cell protection structure 5, and the battery cell 2 and the battery cell protection structure 5 are placed together in the battery housing 3.

[0066] In one embodiment, two side panels 52 are provided, and the side panels 52 are made of insulating material. The side panels 52 are arranged inside the battery housing 3 and are located on both sides of the battery cell. The side panels 52 and the spacers 51 together constitute a battery cell protection structure to fix and protect the battery cell.

[0067] Furthermore, four side plates 52 are provided, which are respectively arranged inside the battery housing 3 and located at the periphery of the battery cell. The side plates 52 and the spacers 51 together constitute a battery cell protection structure to fix and protect the battery cell.

[0068] As shown in Figures 8-9, in one embodiment, both ends of the battery housing 3 are opened, and two battery covers 1 are provided. Step 2 includes the following steps:

[0069] The two first cover plates 11 are buckled, pressed and welded to the two openings of the battery housing 3 respectively, the tabs 4 are welded to the pole blocks 12, and the two pole blocks 12 are independently buckled and welded to the first mounting holes 111 of the two first cover plates 11 respectively.

[0070] Specifically, the two first cover plates 11 are respectively fastened to the two openings of the battery housing 3, and pre-welding and full welding are performed; then, the tabs 4 are welded to the terminal block 12, and the two terminal blocks 12 are independently fastened to the first mounting holes 111 of the two first cover plates 11, and pre-welding and full welding are performed;

[0071] The welding method includes one or more of ultrasonic welding and laser welding.

[0072] As shown in FIG13 , in one embodiment, one end of the battery housing 3 is open, the other end of the battery housing 3 is provided with a second mounting hole 31 , one first cover plate 11 is provided, and two terminal blocks 12 are provided. Step 2 includes the following steps:

[0073] The first cover plate 11 is snap-fitted, pressed and welded to the opening of the battery housing 3, the tab 4 is welded to the pole block 12, one pole block 12 is snap-fitted and welded to the first mounting hole 111 of the first cover plate 11, and the other pole block 12 is snap-fitted and welded to the second mounting hole 31 at the end of the battery housing 3.

[0074] Specifically, the first cover plate 11 is buckled with the opening of the battery housing 3, and pre-welding and full welding are performed; then, the tabs 4 at both ends of the battery cell 2 are welded to the two terminal blocks 12 respectively, and the two terminal blocks 12 are independently buckled with the first mounting hole 111 of the first cover plate 11 and the second mounting hole 31 at the end of the battery housing 3, and pre-welding and full welding are performed;

[0075] The welding method includes one or more of ultrasonic welding and laser welding.

[0076] As shown in Figures 10-12, in one embodiment, the pole block 12 includes a pole plate 121, a first insulating layer 122, a second cover plate 123, a pole 124, a second insulating layer 125 and a pole connecting piece 126. The pole plate 121 and the pole connecting piece 126 are respectively arranged on both sides of the second cover plate 123, the first insulating layer 122 is arranged between the pole plate 121 and the second cover plate 123, the second insulating layer 125 is arranged between the second cover plate 123 and the pole connecting piece 126, and the second cover plate 123 is provided with a second through hole 1231. A third through hole 1211 is defined at a position corresponding to the second through hole 1231. A fourth through hole 1221 is defined at a position corresponding to the second through hole 1231 in the first insulating layer 122. A fifth through hole 1261 is defined at a position corresponding to the second through hole 1231 in the pole connecting piece 126. A sixth through hole 1251 is defined at a position corresponding to the second through hole 1231 in the second insulating layer 125. The pole 124 is sequentially inserted into the third through hole 1211, the fourth through hole 1221, the second through hole 1231, the sixth through hole 1251, and the fifth through hole 1261.

[0077] Specifically, a third through hole 1211 is provided on the pole plate 121, the diameter of the second through hole 1231 is larger than the diameter of the third through hole 1211, the center of the second through hole 1231 is coaxially arranged with the center of the third through hole 1211, the pole 124 passes through the third through hole 1211 and the second through hole 1231, the pole 124 is connected to the pole plate 121 at the third through hole 1211 by surface laser welding, the outer wall of the pole 124 does not contact the inner wall of the second through hole 1231 of the second cover plate 123, a portion of the first insulating layer 122 is located between the pole plate 121 and the second cover plate 123, and is used to isolate the pole plate 121 from contact with the second cover plate 123; another portion of the first insulating layer 122 is located between the inner wall of the second through hole 1231 and the pole 124, and is used to isolate the pole 124 from contact with the second cover plate 123.

[0078] The second insulating layer 125 is located between the second cover plate 123 and the pole connecting piece 126 , and is used to isolate the second cover plate 123 from contacting the pole connecting piece 126 , thereby preventing the battery cell from short-circuiting.

[0079] In one embodiment, the second cover plate 123 is provided with a plurality of second through holes 1231 . Correspondingly, the number of the poles 124 is also plural, and the poles 124 are inserted into the second through holes 1231 in a one-to-one correspondence.

[0080] In a preferred embodiment, two second through holes 1231 are provided on the second cover plate of the present application, and two poles 124 are provided, which are correspondingly inserted into the second through holes 1231. The present application splits a large pole 124 into two small poles 124, ensuring the overcurrent capacity while reducing the volume of the pole 124, reducing the amount of material used for the pole 124, and reducing costs.

[0081] As shown in FIG. 12 , in one embodiment, a recess 112 is provided at the first mounting hole 111 , and a boss 1232 is provided on the outer periphery of the second cover plate 123 . The boss 1232 and the recess 112 are engaged and welded with each other.

[0082] Specifically, when welding is performed at the joints and gaps between the boss 1232 and the recess 112 , the stress-bearing position is the recess 112 provided at the first mounting hole 111 , thereby avoiding the problem of the connection glue being separated due to heat and stress, and improving the safety performance of the battery cover 1 .

[0083] Specifically, the pole 124 of the present application is inserted into the second through hole 1231 on the surface of the second cover plate 123. The pole 124 and the second cover plate 123 are connected by riveting and surface laser welding, which is more reliable than traditional penetration welding.

[0084] In one embodiment, a second welding area is provided on one side of the pole connecting piece 126 close to the pole tab 4 , and the second welding area of ​​the pole connecting piece 126 is welded to the first welding area 42 of the adjacent pole tab 4 .

[0085] Specifically, the area of ​​the second welding zone of the pole connecting piece 126 is greater than or equal to the area of ​​the first welding zone 42 of the pole tab 4, so that it is convenient to weld the first welding zone 42 with the second welding zone. The first welding zone 42 has no exposed area, so after the pole tab 4 is welded to the pole connecting piece 126, the pole tab 4 is prevented from contacting with other parts, thereby preventing the battery cell from short-circuiting. At the same time, the present application directly welds the pole connecting piece 126 to the pole tab 4, saving intermediate connecting pieces or adapters and saving material costs.

[0086] On one hand, the present application provides a battery prepared by the above-mentioned battery preparation method.

[0087] In some embodiments, the battery housing 3 is a square housing, a cylindrical housing, a prismatic housing, or other irregular housings.

[0088] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A method for preparing a battery, wherein: The steps include: Step 1: Place the battery cell into the battery casing; Step 2: Welding and sealing the first cover plate to the battery housing, the first cover plate is used to limit the battery cell in the battery housing, the first cover plate is designed with a first mounting hole, and the tab of the battery cell is led out through the first mounting hole of the first cover plate; Step 3: Place the pole block outside the first mounting hole. The pole block includes a second cover plate and a pole arranged on the second cover plate. Electrically connect the pole tab to the pole. Flip the second cover plate so that it is engaged with the first mounting hole and weld it to fix.

2. The battery preparation method according to claim 1, wherein: Before step 1, a tab is welded to at least one end of the battery cell, a tab protective adhesive layer is applied to the position where the tab is connected to the battery cell, and the end of the tab is exposed to form a first welding area for welding to the pole.

3. The battery preparation method according to claim 2, wherein: The tab protection adhesive layer is selected from one or more of a PP adhesive layer, a PE adhesive layer, a polyimide adhesive layer or an epoxy resin adhesive layer.

4. The battery preparation method according to claim 1, wherein: In step 1, a plurality of battery cells are provided, and the plurality of battery cells are stacked to form a battery cell group.

5. The battery preparation method according to any one of claims 1 or 4, wherein: The step 1 includes the following steps: Two spacers are respectively arranged at the two ends of the battery cell, wherein the spacers are provided with a groove, and a first through hole is opened at the bottom of the groove, and the tabs at the ends of the battery cell pass through the first through hole and extend to the outside of the first through hole; Apply two surface adhesives to the two sides of the battery cell respectively, place two side panels on the other two sides of the battery cell respectively, clamp the side panels and spacers end to end and form a battery cell protection structure together with the surface adhesive, fix the battery cell in the battery cell protection structure, and place the battery cell and the battery cell protection structure together in the battery casing.

6. The battery preparation method according to claim 5, wherein: Both ends of the battery housing are opened, and two battery covers are provided. Step 2 includes the following steps: The two first cover plates are respectively buckled, pressed and welded to the two openings of the battery housing, the pole tabs are welded to the pole block, and the two pole blocks are independently buckled and welded to the first mounting holes of the two first cover plates.

7. The battery preparation method according to claim 1, wherein: One end of the battery housing is open, and the other end of the battery housing is provided with a second mounting hole. One first cover plate is provided, and two terminal blocks are provided. Step 2 includes the following steps: The first cover plate is snap-fitted, pressed and welded to the opening of the battery shell, the electrode tab is welded to the electrode block, one of the electrode blocks is snap-fitted and welded to the first mounting hole of the first cover plate, and the other electrode block is snap-fitted and welded to the second mounting hole at the end of the battery shell.

8. The battery preparation method according to claim 2, wherein: The pole block includes a pole plate, a first insulating layer, a first cover plate, a pole, a second insulating layer and a pole connecting piece. The pole plate and the pole connecting piece are respectively arranged on both sides of the first cover plate, the first insulating layer is arranged between the pole plate and the first cover plate, and the second insulating layer is arranged between the first cover plate and the pole connecting piece. A second through hole is provided on the first cover plate, a third through hole is provided on the pole plate at a position corresponding to the first through hole, a fourth through hole is provided on the first insulating layer at a position corresponding to the first through hole, a fifth through hole is provided on the pole connecting piece at a position corresponding to the first through hole, and a sixth through hole is provided on the second insulating layer at a position corresponding to the first through hole. The pole is sequentially inserted into the third through hole, the fourth through hole, the second through hole, the sixth through hole and the fifth through hole.

9. The battery preparation method according to claim 8, wherein: A second welding area is provided on a side of the pole connecting piece close to the pole tab, and the second welding area of the pole connecting piece is welded to the first welding area of the adjacent pole tab.

10. A battery, wherein: The battery is prepared by the battery preparation method according to any one of claims 1 to 9.

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