Battery cover plate, battery and battery assembly method

Abstract

The application relates to the technical field of battery production, in particular to a battery cover plate, a battery and a battery assembling method, wherein the battery cover plate comprises an end cover and an even number of connecting plates, the inner side of the end cover is provided with an even number of receiving grooves corresponding to the connecting plates one by one, and one end of the connecting plate is rotationally connected in the receiving groove; one half of the connecting plates and the other half of the connecting plates are opposite in rotation direction during the process from the initial state to entering the receiving groove. The application divides the even number of connecting plates into two equal parts, and the two equal parts are respectively used for being connected with the tab and being bent in opposite directions, so that the force of the tab on the end cover is counteracted in one direction, the stress of the end cover in the direction is zero, the end cover is finally pressed with the shell, and the stress rebound caused by the tab bending cannot cause the end cover and the shell to be pressed.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing technology, and more specifically, to a battery cover, a battery, and a battery assembly method. Background Technology

[0002] The battery cell is the core energy storage unit of a battery, and it is currently mainly divided into laminated cells and wound cells. A laminated cell is a structure formed by stacking positive electrode plates, negative electrode plates, and a separator layer by layer to form a current collector, and then leading out positive and negative tabs from the current collector. For example... Figure 1 The diagram shows the state of a stacked battery in the prior art during assembly. In the prior art battery assembly process, the multi-layer electrode sheets on one side of the bare cell 2 are pressed together to form a tab 201, and then the tab 201 is bent at 90° and directly welded to the end cap 1.

[0003] However, due to the excessive number of laminations, the tab 201 will experience yield stress and stress rebound after bending. The tab 201 will exert an outward pressure on the end cap 1, causing the end cap 1 to move in the y-axis direction, resulting in the end cap 1 and... Figure 2 The shell 7 shown cannot be pressed together, which eventually leads to defects such as gaps or incomplete welds in the peripheral welds of the end cap 1 and the shell 7. Summary of the Invention

[0004] In view of the problem in the prior art where stress rebound caused by the bending of the tabs prevents the end cap from being pressed together with the shell, resulting in gaps or incomplete welds at the periphery of the end cap and the shell, the present invention provides a battery cover, a battery, and a battery assembly method that can press the end cap and the shell together, avoiding defects such as gaps or incomplete welds at the periphery of the end cap and the shell.

[0005] To solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows: A battery cover includes an end cap and an even number of connecting tabs for connection with terminals. The inner side of the end cap has an even number of receiving slots corresponding to each connecting tab. One end of each connecting tab is rotatably connected to a receiving slot. The receiving slots accommodate the connecting tabs and the terminals connected to them. Half of the connecting tabs rotate in opposite directions to the other half as they move from their initial state into the receiving slots. It is understood that the inner side of the end cap is the side used to connect with the housing, and the outer side of the end cap is the side exposed after connection with the housing.

[0006] In the above technical solution, the connecting tabs are used to connect one by one to the tabs at the end of the bare battery cell. The tabs are bent by rotating the connecting tabs. Since half of the connecting tabs rotate in opposite directions to the other half, the bending directions of the tabs are opposite to those of the other half. The forces applied to the end cap in the y-axis direction cancel each other out, resulting in zero force on the end cap in the y-axis direction. This prevents movement of the end cap in the y-axis direction and ultimately avoids defects such as gaps or incomplete welds between the end cap and the casing. Furthermore, since the bent tabs can be stored in the storage slot without occupying internal space in the casing, the effective volume of the casing is saved, thereby increasing the overall energy density of the battery.

[0007] Furthermore, the connecting piece is connected to a locking component, and the end cap is provided with a mating structure for engaging with the locking component. When the tab is bent into place, the locking component engages with the mating structure, thereby locking the shaft. It can be understood that because the shaft can be locked and cannot slide back to its original position, the tab cannot rotate back to its original position around its bend, and the end cap cannot move away from the housing along the x-axis. This makes the connection between the end cap and the housing smoother and more secure.

[0008] Furthermore, each of the connecting pieces has a rotating shaft at one end, and the locking component is located at the end of each rotating shaft. Each locking component includes a spring and a locking block, with the two ends of the spring connected to the end of the rotating shaft and the locking block, respectively. Each of the receiving grooves has a sliding groove on its inner wall, and the mating structure is provided on the inner wall of each sliding groove. Both the locking component and the end of the rotating shaft are slidably disposed within the sliding groove, and the mating structure is used for the locking block to extend into and engage with the locking block. It can be understood that during the bending of the tab, the spring is compressed, and the rotating shaft rotates while sliding along the sliding groove until the locking block slides to the mating structure and is pushed into the mating structure by the spring, thereby locking the rotating shaft.

[0009] Of course, in addition to the methods mentioned above, the connection between the locking component and the mating structure can also be a magnetic connection or a slider-wedge connection. For a magnetic connection, a slot is created on the inner wall of the slide, and a magnet is placed inside the slot. The locking component is made of an iron / nickel alloy and automatically attracts and locks when it approaches the magnet. For a slider-wedge connection, a tapered slope is created on the inner wall of the slide, and the locking component is a wedge-shaped block that is squeezed and wedged tightly when sliding to the slope.

[0010] Furthermore, an anti-reverse component is provided on the outer circumferential surface of the rotating shaft. When the connecting piece is perpendicular to the end cap, the anti-reverse component abuts against the bottom of the storage groove. The anti-reverse component can prevent the rotating shaft from rotating in the opposite direction, ensuring that the rotating shaft can only rotate in the direction of the drive tab bending, thereby preventing tab bending failure.

[0011] Preferably, the end cap includes a terminal post and a cover plate body connected in sequence, the edge of the cover plate body being connected to one end edge of the housing; the cover plate body is provided with an injection hole, the injection hole communicating with the inner cavity of the housing; a first insulating layer is provided on the side of the cover plate body near the bare cell, and a second insulating layer is provided on the side of the connecting piece away from the electrode tab; the receiving grooves are all formed on the side of the cover plate body away from the terminal post. It is understood that the insulating layer can prevent contact between the side of the cover plate body and the connecting piece and the bare cell, avoiding short circuits caused by simultaneous contact between the positive and negative electrode pieces and the side of the cover plate body and the connecting piece. Applying an insulating coating can replace the traditional process of covering the soldering with insulating tape, thereby eliminating the adhesive application process and saving multiple steps such as tape cutting, positioning, bonding, and rolling, shortening the process flow. Moreover, applying an insulating coating can achieve more reliable insulation and sealing compared to the traditional adhesive application process, making it more suitable for high-energy-density batteries.

[0012] This invention also provides a battery, including a bare cell and a casing. The casing is fitted over the bare cell and includes the aforementioned battery cover. One end of the bare cell has an even number of tabs corresponding to the connecting tabs. Each tab is connected to one of the connecting tabs, wherein the bending direction of half of the tabs is opposite to that of the other half. Both the tabs and the connecting tabs are located within their corresponding receiving grooves, and the tabs abut against the inner wall of the receiving grooves. One end of the battery cover is connected to one end of the casing. The tabs at one end of the bare cell can all be positive tabs, all be negative tabs, or include both positive and negative tabs simultaneously.

[0013] It should be noted that a bare cell can be a stacked cell made by alternately stacking positive electrode plates, separators and negative electrode plates, or a wound cell made by sequentially stacking positive electrode plates, separators and negative electrode plates and then winding them.

[0014] The beneficial effects of the aforementioned battery are similar to those of the aforementioned battery cover, and therefore will not be repeated.

[0015] Preferably, two battery covers are provided, and the two battery covers are respectively connected to both ends of the housing; both ends of the bare cell are provided with an even number of tabs, and the tabs are connected to the connecting pieces one by one; the tabs at one end of the bare cell are all positive tabs, and the tabs at the other end are all negative tabs. In this technical solution, the positive tab of the battery is located at one end of the bare cell, and the negative tab is located at the other end of the bare cell.

[0016] The present invention also provides a battery assembly method, which is applied to the above-mentioned battery, comprising the following steps: S1: Prepare the end caps and bare battery cells mentioned above; S2: Attach and weld one side of the electrode tab to one side of the corresponding connecting piece; S3: Push the end cap toward the bare cell, so that the tabs bend one by one and enter the storage groove to abut against the storage groove.

[0017] Preferably, in step S3, before pushing the end cap towards the bare cell, the connecting piece is first pushed to pre-bend the tab, and then the end cap is pushed towards the bare cell. This reduces the resistance when pushing the end cap and ensures that the tab can be bent smoothly.

[0018] Preferably, in step S1, an insulating coating is applied to both the side of the end cap where the receiving groove is formed and the side of the connecting piece not used for connection with the electrode tab. As mentioned above, applying an insulating coating can replace the traditional process of covering the soldering with insulating tape, thereby eliminating the adhesive application process and saving multiple steps such as tape cutting, positioning, bonding, and rolling, thus shortening the process flow. Moreover, applying an insulating coating can achieve more reliable insulation and sealing compared to the traditional adhesive application process, making it more suitable for high-energy-density batteries.

[0019] Preferably, two end caps are provided, and the two end caps are respectively connected to both ends of the housing; the other end of the bare battery cell is also provided with multiple tabs, the tabs at both ends of the bare battery cell having opposite polarities and being respectively connected to the two end caps. It should be noted that the connection method between the two end caps and the tabs at both ends of the bare battery cell is the same, so neither end cap will be misaligned.

[0020] Compared with the prior art, the beneficial effects of the present invention are: (1) An even number of connecting pieces are set on the end cap, and the connecting pieces are divided into two equal parts and used to connect with the tabs and bend in opposite directions. This can cancel the force of the tabs on the end cap in the y-axis direction, so that the end cap is under zero force in the y-axis direction. Finally, the end cap and the shell are pressed together, thereby avoiding welding defects around the end cap and the shell. In addition, the storage groove set on the end cap can store the bent tabs and connecting pieces, which can save the effective volume of the shell and thus improve the energy density of the entire battery.

[0021] (2) An insulating coating is applied to the side of the end cap where the storage groove is opened and the side of the connecting piece that is not connected to the electrode tab. The process of covering the soldering with insulating tape is replaced by applying an insulating coating, thereby eliminating the adhesive application process and saving multiple processes such as tape cutting, positioning, bonding and rolling, thus shortening the process flow. Moreover, the insulating coating can achieve more reliable insulation and sealing compared with the traditional adhesive application process. Attached Figure Description

[0022] Figure 1 This is a state diagram illustrating the connection process between the bare battery cell and the end cap in the existing technology. Figure 2 This is a schematic diagram of the shell structure; Figure 3 This is a schematic diagram of the end cap structure; Figure 4 This is a cross-sectional view of the end cap in one of the directions. Figure 5 This is a sectional view of the end cap in another sectional direction; Figure 6 This is a cross-sectional view of the rotating shaft and anti-reverse component; Figure 7 This is a structural schematic diagram of the connecting piece from one of the viewpoints. Figure 8 This is a structural diagram of the connecting piece from another perspective; Figure 9 This is a schematic diagram illustrating the connection process between a bare cell and an end cap in a battery assembly method. Figure 10 This is a schematic diagram of the state of the electrode tabs before bending in a battery assembly method. Figure 11 This is a schematic diagram showing the state of the electrode tabs after bending in a battery assembly method.

[0023] In the attached diagram: 1-End cap; 101-Pole post; 102-Cover plate body; 1021-Receiving groove; 1022-Sliding groove; 1023-Matching structure; 1024-Injection hole; 2-Bare cell; 201-Electrode tab; 3-Connecting piece; 4-Shaft; 5-Locking assembly; 501-Spring; 502-Clocking block; 6-Anti-reverse component; 7-Housing shell. Detailed Implementation

[0024] The accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0025] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "long," and "short" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0026] The technical solution of the present invention will be further described in detail below through specific embodiments and with reference to the accompanying drawings: Example 1 This embodiment is a first embodiment of a battery cover, combined with... Figures 2 to 11 As shown, it includes an end cap 1 and two connecting pieces 3 for connecting to tabs 201. The inner side of the end cap 1 has two receiving slots 1021 corresponding to the connecting pieces 3. One end of each connecting piece 3 is rotatably connected to a receiving slot 1021. The receiving slot 1021 accommodates the connecting piece 3 and the tabs 201 connected to it. One connecting piece 3 and the other connecting piece 3 rotate in opposite directions from their initial state to entering the receiving slot 1021, and both connecting pieces 3 gradually retract inwards. Ultimately, the rotating end of the connecting piece 3 is farther from the horizontal centerline of the end cap 1 than the other end of the connecting piece 3. It can be understood that the inner side of the end cap 1 is the side used to connect to the housing 7, and the outer side of the end cap 1 is the side exposed after the end cap 1 is connected to the housing 7.

[0027] Furthermore, the two storage slots 1021 are staggered.

[0028] Furthermore, the connecting piece 3 is connected to a locking component 5, and the end cap 1 is provided with a mating structure 1023 for engaging with the locking component 5. When the tab 201 is bent into place, the locking component 5 engages with the mating structure 1023, thereby locking the rotating shaft 4. It can be understood that since the rotating shaft 4 can be locked and cannot slide back to its original position, the tab 201 cannot rotate back to its original position around its bend, and the end cap 1 cannot move away from the x-axis direction of the housing 7. This makes the connection operation between the end cap 1 and the housing 7 smoother and the connection between the two more secure.

[0029] Furthermore, each connecting piece 3 has a rotating shaft 4 at one end, and a locking component 5 at the end of each rotating shaft 4. Each locking component 5 includes a spring 501 and a locking block 502. The two ends of the spring 501 are respectively connected to the end of the rotating shaft 4 and the locking block 502. Slide grooves 1022 are provided on both sides of the inner wall of the storage groove 1021, meaning that one storage groove 1021 has two slide grooves 1022. Each end of the slide groove 1022 has a locking structure 1023. The locking component 5 and the end of the rotating shaft 4 are slidably disposed within the slide groove 1022. The locking structure 1023 is used for the locking block 502 to extend into and engage with the locking block 502. It can be understood that during the bending of the tab 201, the spring 501 is in a compressed state, and the rotating shaft 4 rotates while sliding along the slide groove 1022 until the locking block 502 slides to the locking structure 1023 and is pushed into the locking structure 1023 by the spring 501, thereby locking the rotating shaft 4. Of course, the slide groove 1022 can be omitted, as long as the rotating shaft 4 can slide. However, setting the slide groove 1022 can make the sliding of the rotating shaft 4 more stable.

[0030] The connection between the locking component 5 and the mating structure 1023 can also be a magnetic connection or a slider-wedge connection. If it is a magnetic connection, a slot is formed on the inner wall of the slide groove 1022, and a magnet is placed inside the slot. The locking component 5 is made of an iron / nickel alloy and automatically attracts and locks when it approaches the magnet. If it is a slider-wedge connection, a tapered slope is formed on the inner wall of the slide groove 1022, and the locking component 5 is a wedge-shaped block that is squeezed and wedged tightly when sliding to the slope.

[0031] Furthermore, an anti-reverse rotation component 6 is provided on the outer circumferential surface of the rotating shaft 4. Specifically, the anti-reverse rotation component 6 includes a connecting part 601 and an abutting part 602 that are interconnected and perpendicular to each other. The connecting part 601 is connected to the rotating shaft 4, and when the connecting piece 3 is perpendicular to the end cap 1, the abutting part 601 abuts against the bottom of the receiving groove 1021. The anti-reverse rotation component 6 can prevent the rotating shaft 4 from rotating in the opposite direction, so that the rotating shaft 4 can only rotate in the direction of bending of the drive tab 201, thereby preventing the tab 201 from failing to bend.

[0032] Furthermore, the end cap 1 includes a terminal post 101 and a cover plate body 102 connected in sequence. The edge of the cover plate body 102 is connected to one end edge of the housing 7. The cover plate body 102 is provided with an injection hole 1024, which communicates with the inner cavity of the housing 7 to inject electrolyte into the housing 7. A first insulating layer is provided on the side of the cover plate body 102 near the bare cell 2, and a second insulating layer is provided on the side of the connecting piece 3 away from the tab 201. The receiving grooves 1021 are all opened on the side of the cover plate body 102 away from the terminal post 101. It can be understood that the insulating layer can prevent the side of the cover plate body 102 and the connecting piece 3 from contacting the bare cell 2, and prevent short circuits caused by the positive and negative electrode pieces contacting the side of the cover plate body 102 and the connecting piece 3 at the same time. By coating with an insulating coating, the traditional process of covering the soldering with insulating tape can be replaced, thereby eliminating the adhesive application process and saving multiple processes such as tape cutting, positioning, bonding and rolling, shortening the process flow. Moreover, applying an insulating coating can achieve more reliable insulation and sealing compared to the traditional adhesive application process, making it more suitable for high-energy-density batteries.

[0033] The working principle or workflow of this embodiment is as follows: The connecting piece 3 is used to weld one by one to the tabs 201 at the end of the bare cell 2. The tabs 201 are bent by rotating the connecting piece 3. Since the rotation direction of one connecting piece 3 is opposite to that of the other connecting piece 3, the bending directions of the two tabs 201 are opposite. The forces applied to the end cap 1 in the y-axis direction cancel each other out, so that the force on the end cap 1 in the y-axis direction is zero. This avoids the end cap 1 from moving in the y-axis direction, and ultimately avoids defects such as gaps or poor welding between the end cap 1 and the periphery of the housing 7. In addition, since the tabs 201 can be stored in the storage groove 1021 after bending without occupying the internal space of the housing 7, the effective volume of the housing 7 can be saved, thereby improving the energy density of the entire battery.

[0034] Example 2 This embodiment is a second embodiment of a battery cover. This embodiment is similar to embodiment 1, except that the storage slot 1021 in this embodiment has four openings, and the connecting piece 3 is provided with four pieces accordingly.

[0035] Other features and beneficial effects of this embodiment are consistent with those of Embodiment 1.

[0036] Example 3 This embodiment is a third embodiment of a battery cover. This embodiment is similar to embodiment 1, except that, in the process of one connecting piece 3 and another connecting piece 3 moving from the initial state to entering the storage groove 1021, both connecting pieces 3 gradually unfold outwards, and finally the rotating end of the connecting piece 3 is closer to the horizontal center line of the end cover 1 than the other end of the connecting piece 3.

[0037] Other features and beneficial effects of this embodiment are consistent with those of Embodiment 1.

[0038] Example 4 This embodiment is a first embodiment of a battery, combined with Figures 2 to 11 As shown, it includes a bare battery cell 2 and a housing 7. The housing 7 is fitted over the bare battery cell 2 and also includes the battery cover plate described in Embodiment 1. One end of the bare battery cell 2 has two tabs 201 that correspond one-to-one with the connecting pieces 3. The tabs 201 are connected one-to-one with the connecting pieces 3. The bending direction of half of the tabs 201 is opposite to that of the other half. Both the tabs 201 and the connecting pieces 3 are located in their corresponding storage grooves 1021 and the tabs 201 abut against the inner wall of the storage grooves 1021. One end of the battery cover plate is connected to one end of the housing 7. The tabs 201 at one end of the bare battery cell 2 can all be positive tabs, all be negative tabs, or include both positive and negative tabs.

[0039] Specifically, the battery targeted in this embodiment is a stacked battery, and the bare cell 2 is a stacked cell formed by stacking a positive electrode, a separator and a negative electrode in sequence.

[0040] In this embodiment, two battery covers are provided, which are respectively connected to both ends of the housing 7; each end of the bare cell 2 is provided with two tabs 201, which are connected to the connecting pieces 3 one-to-one; the tabs 201 at one end of the bare cell 2 are all positive tabs 201, and the tabs 201 at the other end are all negative tabs 201. The positive tabs 201 of the battery are located at one end of the bare cell 2, and the negative tabs 201 are located at the other end of the bare cell 2.

[0041] Other features and beneficial effects of this embodiment are consistent with those of Embodiment 1.

[0042] Example 5 This embodiment is similar to embodiment 4, except that the battery targeted in this embodiment is a wound battery, and the bare cell 2 is a wound cell formed by stacking and winding the positive electrode sheet, separator and negative electrode sheet in sequence.

[0043] Other features and beneficial effects of this embodiment are consistent with those of Embodiment 2.

[0044] Example 6 This embodiment is a first embodiment of a battery assembly method, combined with Figures 2 to 11 As shown, it includes the following steps: S1: Prepare the end cap 1 and bare battery cell 2 as described above; S2: Attach and weld one side of the tab 201 to one side of the corresponding connecting piece 3; S3: Push the end cap 1 toward the bare cell 2, causing the tabs 201 to bend one by one and enter the storage slot 1021 to abut against it. During the bending process of the tabs 201, the spring 501 is in a compressed state, and the rotating shaft 4 slides and rotates at the same time until the locking block 502 of the locking component 5 slides to the mating structure 1023. The spring 501 pushes the locking block 502 into the mating structure 1023 and engages with it, thereby locking the rotating shaft 4 at the mating structure 1023. At this time, the tabs 201 are just bent into place.

[0045] Furthermore, in step S3, before pushing the end cap 1 towards the bare cell 2, the connecting piece 3 is first pushed to pre-bend the tab 201, and then the end cap 1 is pushed towards the bare cell 2. This reduces the resistance to pushing the end cap 1 and ensures that the tab 201 can be bent smoothly.

[0046] Furthermore, in step S1, an insulating coating is applied to both the side of the end cap 1 where the receiving groove 1021 is formed and the side of the connecting piece 3 not used for connection with the tab 201. As mentioned above, applying an insulating coating can replace the traditional process of covering the soldering with insulating tape, thereby eliminating the adhesive application process and saving multiple steps such as tape cutting, positioning, bonding, and rolling, thus shortening the process flow. Moreover, applying an insulating coating can achieve more reliable insulation and sealing compared to the traditional adhesive application process, making it more suitable for high-energy-density batteries.

[0047] Furthermore, there are two end caps 1, which are respectively connected to both ends of the housing 7; the other end of the bare cell 2 is also provided with multiple tabs 201, the tabs 201 at both ends of the bare cell 2 have opposite polarities and are respectively connected to the two end caps 1. It should be noted that the connection method between the two end caps 1 and the tabs 201 at both ends of the bare cell 2 is the same, so neither end cap 1 will be offset.

[0048] Other features and beneficial effects of this embodiment are consistent with those of Embodiment 4 or Embodiment 5.

[0049] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A battery cover, comprising an end cap (1), characterized in that, It also includes an even number of connecting pieces (3) for connecting to the tabs (201). The inner side of the end cap (1) is provided with an even number of storage slots (1021) corresponding to the connecting pieces (3). One end of each connecting piece (3) is rotatably connected to the storage slot (1021). The storage slot (1021) is used to accommodate the connecting piece (3) and the tabs (201) connected to the connecting piece (3). Half of the connecting pieces (3) and the other half of the connecting pieces (3) rotate in opposite directions from the initial state to entering the storage slot (1021).

2. A battery cover according to claim 1, characterized in that, The connecting piece (3) is connected to the locking component (5), and the end cap (1) is provided with a mating structure (1023) for mating with the locking component (5).

3. A battery cover according to claim 2, characterized in that, One end of each connecting piece (3) is provided with a rotating shaft (4), and the end of each rotating shaft (4) is provided with a locking component (5). Each locking component (5) includes a spring (501) and a locking block (502). The two ends of the spring (501) are respectively connected to the end of the rotating shaft (4) and the locking block (502). Each inner wall of the storage groove (1021) is provided with a sliding groove (1022), and the inner wall of the sliding groove (1022) is provided with a mating structure (1023). The ends of the locking component (5) and the rotating shaft (4) are slidably disposed in the sliding groove (1022). The mating structure (1023) is used for the locking block (502) to extend into and engage with the locking block (502).

4. A battery cover according to claim 3, characterized in that, The outer circumferential surface of the rotating shaft (4) is provided with an anti-reverse component (6). When the connecting piece (3) is perpendicular to the end cap (1), the anti-reverse component (6) abuts against the bottom of the storage groove (1021).

5. A battery comprising a bare cell (2) and a casing (7), the casing (7) being fitted over the bare cell (2), characterized in that, It also includes the battery cover plate according to any one of claims 1 to 4, wherein one end of the bare cell (2) is provided with an even number of tabs (201) corresponding one-to-one with the connecting piece (3); the tabs (201) are connected one-to-one with the connecting piece (3), wherein the bending direction of half of the tabs (201) is opposite to the bending direction of the other half of the tabs (201), the tabs (201) and the connecting piece (3) are both located in the corresponding storage groove (1021) and the tabs (201) abut against the inner wall of the storage groove (1021); one end of the battery cover plate is connected to one end of the housing (7).

6. A battery according to claim 5, characterized in that, The end cap (1) includes a pole post (101) and a cover plate body (102) connected in sequence. The edge of the cover plate body (102) is connected to one end edge of the housing (7). The cover plate body (102) is provided with a liquid injection hole (1024), which is connected to the inner cavity of the housing (7). The cover plate body (102) is provided with a first insulating layer on the side near the bare cell (2), and the connecting piece (3) is provided with a second insulating layer on the side away from the tab (201). The storage grooves (1021) are all opened on the side of the cover plate body (102) away from the pole post (101).

7. A battery according to claim 5, characterized in that, Two battery covers are provided, and the two battery covers are respectively connected to the two ends of the housing (7); both ends of the bare cell (2) are provided with an even number of tabs (201), and the tabs (201) are connected to the connecting piece (3) one by one; the tabs (201) at one end of the bare cell (2) are all positive tabs (201), and the tabs (201) at the other end are all negative tabs (201).

8. A battery assembly method, applied to the battery of claim 7, characterized in that, Includes the following steps: S1: Prepare the end cap (1) and the bare battery cell (2); S2: Attach and weld one side of the electrode tab (201) to one side of the corresponding connecting piece (3); S3: Push the end cap (1) toward the bare cell (2) so that the tabs (201) bend one by one and enter the storage groove (1021) to abut against the storage groove (1021).

9. A battery assembly method according to claim 8, characterized in that, In step S3, before pushing the end cap (1) toward the bare cell (2), the connecting piece (3) is pushed to pre-bend the tab (201), and then the end cap (1) is pushed toward the bare cell (2).

10. A battery assembly method according to claim 8, characterized in that, In step S1, an insulating coating is applied to the side of the end cap (1) where the storage groove (1021) is opened and to the side of the connecting piece (3) where it is not used to connect with the tab (201).

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