Battery protection plate and battery assembly

Abstract

This utility model relates to the field of new energy battery technology and discloses a battery protection board and battery assembly. The battery protection board includes a circuit board, a nickel sheet, and electronic components. The circuit board has a first surface and a second surface arranged at relative intervals. The nickel sheet includes a first connecting piece and a second connecting piece, the first connecting piece being connected to the second connecting piece and forming a bent shape. The second connecting piece is connected to the second surface. Along the thickness direction of the circuit board, the first connecting piece extends toward and beyond the first surface. The electronic components are disposed on the first surface. In this utility model, the first connecting piece extends toward and beyond the first surface, and the height of the electronic components offsets part of the thickness of the first connecting piece after bending at the electrode connection of the battery cell, thereby saving space occupied by the battery protection board along the length of the battery and increasing the space utilization rate of the battery.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery technology, specifically to a battery protection board and battery assembly. Background Technology

[0002] With the rapid development of battery packaging technology, in order to increase battery capacity, manufacturers currently optimize the design of the battery head space, and fold-top sealed batteries are a commonly used packaging method. In fold-top sealed batteries, the battery protection board is fixed to the top end face of the cell and connected to the cell by spot welding of nickel sheets to the electrode tabs.

[0003] In existing technologies, the packaging solution involves two layers of folded nickel sheets and two layers of folded tabs. However, this packaging structure occupies a significant amount of space along the length of the battery, resulting in a smaller effective space utilization for the battery. Utility Model Content

[0004] In view of this, the present invention provides a battery protection board and battery assembly to solve the problem of limited effective space utilization for batteries.

[0005] In a first aspect, the present invention provides a battery protection board, comprising: a circuit board having a first surface and a second surface disposed at relative intervals; a nickel sheet, the nickel sheet including a first connecting piece and a second connecting piece, the first connecting piece being connected to the second connecting piece and forming a bent shape, the second connecting piece being connected to the second surface, the first connecting piece extending toward and beyond the first surface along the thickness direction of the circuit board; and electronic components disposed on the first surface.

[0006] Beneficial effects: The first connecting piece extends toward and beyond the first surface, and the height of the electronic components offsets part of the thickness after the first connecting piece is bent to connect with the battery cell's tab, thereby saving the space occupied by the battery protection board in the length direction of the battery, and thus increasing the space utilization rate of the battery.

[0007] In one alternative embodiment, the first connecting piece includes a main body and a bent portion, the bent portion being connected to the main body. Along the thickness direction of the circuit board, the main body extends toward and across the first surface, and the bent portion is adapted to bend to fit against the first surface.

[0008] In one alternative embodiment, a notch is provided at the connection between the main body and the bent portion.

[0009] Beneficial effect: By creating a notch at the connection between the main body and the bending section, the nickel sheet can be bent quickly and accurately.

[0010] In one optional embodiment, a pre-bending line is provided at the connection between the main body and the bending portion.

[0011] Beneficial effect: By setting a pre-bending line at the connection between the main body and the bending section, the nickel sheet can be bent quickly and accurately.

[0012] In one optional embodiment, the circuit board further has a third surface, which is perpendicular to the first surface and the second surface, respectively. A clearance groove is formed on the third surface, the main body is located in the clearance groove, and the bent portion extends out of the clearance groove.

[0013] Beneficial effect: By placing the main body in the clearance groove, the overall height of the circuit board and the main body after assembly will not increase due to the presence of the main body.

[0014] Secondly, this utility model also provides a battery assembly, including: the aforementioned battery protection board; a battery cell, the battery cell being disposed near the second surface of the circuit board, the battery cell including a tab, the tab being connected to the first connecting piece, the tab and the first connecting piece being adapted to bend together toward the first surface, and the first connecting piece being adapted to bend to fit against the first surface.

[0015] In one optional embodiment, the battery assembly further includes a top seal and side seals, the top seal being disposed between the battery cell and the battery protection board, and the side seals being disposed on both sides of the battery cell and connected to the top seal.

[0016] Beneficial effects: The top and side seals provide multi-directional protection for the battery cell, preventing damage to the positive and negative terminals and protecting the battery cell from contamination by dust, dirt, and other impurities during manufacturing and transportation.

[0017] In one alternative embodiment, the battery assembly further includes a protective structure disposed at one end of the battery assembly having the battery protection plate, and covering the tabs and the outside of the battery protection plate.

[0018] Beneficial effects: By setting up a protective structure, the battery protection board, tabs and nickel sheets are structurally protected, preventing them from being exposed to the outside and being contaminated or damaged.

[0019] In one alternative implementation, the protective structure is a hot melt adhesive.

[0020] In one optional embodiment, the tab and the bending portion are adapted to bend together toward the first surface, and the distance from the first surface to the tab along the thickness direction of the circuit board is H, and the thickness of the electronic component is h, satisfying H≤h. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the battery protection board according to an embodiment of the present utility model;

[0023] Figure 2 This is a schematic diagram of the battery assembly structure in an embodiment of the present utility model;

[0024] Figure 3 This is a schematic diagram of the battery assembly of this utility model before bending at the bent portion and the tab.

[0025] Figure 4 This is a schematic diagram of the battery assembly in an embodiment of the present invention after the bending portion and the tab are bent.

[0026] Figure 5 for Figure 4 Enlarged view of point A;

[0027] Figure 6 This is a schematic diagram of the battery assembly after being covered with a protective structure according to an embodiment of the present invention.

[0028] Explanation of reference numerals in the attached figures:

[0029] 10. Circuit board; 11. First surface; 12. Second surface; 13. Third surface; 131. Clearance groove; 20. Nickel sheet; 21. First connecting piece; 211. Main body; 212. Bending part; 213. Notch; 22. Second connecting piece; 30. Battery cell; 31. Electrode; 40. Top seal; 50. Side seal; 60. Protective structure; 70. Electrical components. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0031] The following is combined with Figures 1 to 6The following describes embodiments of the present invention.

[0032] According to an embodiment of the present invention, in a first aspect, a battery protection board is provided, including a circuit board 10, a nickel sheet 20, and electronic components. The circuit board 10 has a first surface 11 and a second surface 12 disposed at relative intervals. The nickel sheet 20 includes a first connecting piece 21 and a second connecting piece 22. The first connecting piece 21 is connected to the second connecting piece 22 and forms a bent shape. The second connecting piece 22 is connected to the second surface 12. Along the thickness direction of the circuit board 10, the first connecting piece 21 extends toward the first surface 11 and crosses the first surface 11. The electronic components are disposed on the first surface 11.

[0033] In the battery protection board of this embodiment, the first connecting piece 21 extends toward and beyond the first surface 11. The height of the electronic components is used to offset the thickness of the first connecting piece 21 after it is bent to connect with the tab 31 of the cell 30, thereby saving the space occupied by the battery protection board in the length direction of the battery and thus increasing the space utilization rate of the battery.

[0034] Specifically, circuit board 10 is a PCB (Printed Circuit Board).

[0035] Specifically, the first connecting piece 21 and the second connecting piece 22 are integrally formed.

[0036] Specifically, the battery cell 30 is generally located on the side of the circuit board 10 away from the electrical components 70, that is, close to the second surface 12.

[0037] It should be noted that in the relevant technology, the current packaging scheme involves folding two layers of nickel sheets 20 and two layers of tabs 31, and all nickel sheets 20 are placed on the second surface 12 of the circuit board 10. This arrangement occupies space in the length direction of the battery assembly, reducing the space utilization rate within the battery assembly. Therefore, in this embodiment, the second connecting piece 22 of the nickel sheet 20 is connected to the second surface 12, and the first connecting piece 21 extends towards and across the first surface 11. When the battery protection board is connected to the cell 30, the tabs 31 of the cell 30 are bent and abut against the first surface 11. The height of the electronic components is used to offset the thickness of the first connecting piece 21 after it is bent and connected to the tabs 31 of the cell 30, thereby saving the space occupied by the battery protection board in the length direction of the battery. As a result, the battery capacity can be increased without changing the overall size of the battery assembly.

[0038] Furthermore, in the current packaging scheme, the distance between the battery protection board and the side surface of the front end of the cell 30 is 0.4mm or more. The distance between the battery protection board of this embodiment and the side surface of the front end of the cell 30 is 0.1mm or more, saving space in the length direction of the battery assembly. Without increasing the size of the battery assembly, the battery capacity can be increased by more than 20mAh using the saved space.

[0039] In one embodiment, the first connecting piece 21 includes a main body 211 and a bent portion 212. The bent portion 212 is connected to the main body 211. Along the thickness direction of the circuit board 10, the main body 211 extends toward and across the first surface 11, and the bent portion 212 is adapted to bend to fit against the first surface 11.

[0040] Specifically, the main body 211 and the bending part 212 are integrally formed.

[0041] Specifically, after the battery protection board is connected to the cell 30, the tab 31 of the cell 30 is bent to the first connecting piece 21, and the bent part 212 is bent to fit against the first surface 11.

[0042] In one embodiment, such as Figure 1 As shown, a notch 213 is provided at the connection between the main body 211 and the bent part 212.

[0043] Specifically, such as Figure 1 As shown, in this embodiment, two notches 213 are symmetrically opened on both sides of the connection between the main body 211 and the bent part 212.

[0044] It is worth noting that a notch 213 is provided at the connection between the main body 211 and the bending part 212 to facilitate the quick and accurate bending of the nickel sheet 20.

[0045] Of course, in other alternative embodiments, a pre-bending line can be provided at the connection between the main body 211 and the bending part 212 to facilitate the quick and accurate bending of the nickel sheet 20.

[0046] In one embodiment, such as Figure 1 As shown, the circuit board 10 also has a third surface 13, which is perpendicular to the first surface 11 and the second surface 12 respectively. A clearance groove 131 is provided on the third surface 13, the main body 211 is located in the clearance groove 131, and the bent part 212 extends out of the clearance groove 131.

[0047] Specifically, such as Figure 1 As shown, two sets of nickel sheets 20 are spaced apart, and two clearance grooves 131 are spaced apart on the third surface 13.

[0048] It is worth noting that by placing the main body 211 inside the clearance groove 131, the overall height of the circuit board 10 and the main body 211 after assembly is not increased due to the presence of the main body 211.

[0049] According to an embodiment of the present invention, in a second aspect, a battery assembly is also provided, including: the aforementioned battery protection board and a battery cell 30; the battery cell 30 is disposed near the second surface 12 of the circuit board 10, the battery cell 30 includes a tab 31, the tab 31 is connected to a first connecting piece 21, the tab 31 and the first connecting piece 21 are adapted to bend together toward the first surface 11, and the first connecting piece 21 is adapted to bend to fit against the first surface 11.

[0050] Specifically, in this embodiment, the tabs 31 of the battery cell 30 are directly attached to the first connecting piece 21 and connected by laser spot welding.

[0051] It should be noted that the tab 31 of the battery cell 30 is directly attached to the first connecting piece 21, which makes it easy to control the length of the tab 31.

[0052] In one embodiment, such as Figures 2 to 4 As shown, the battery assembly also includes a top seal 40 and a side seal 50. The top seal 40 is disposed between the battery cell 30 and the battery protection board, and the side seals 50 are disposed on both sides of the battery cell 30 and connected to the top seal 40.

[0053] Specifically, such as Figure 2 As shown, two side seals 50 are respectively disposed on both sides of the cell 30, and the two ends of the top seal 40 are respectively connected to the side seals 50 on both sides. The middle part of the top seal 40 is disposed between the cell 30 and the battery protection board.

[0054] Furthermore, such as Figure 2 As shown, the top seal 40 is bent at both ends by 90° and fixed to the side seal 50 with PUR adhesive (Polyurethane Reactive Moisture Curing Reactive Polyurethane Hot Melt Adhesive).

[0055] It is worth noting that the top seal 40 and the side seal 50 provide multi-directional protection for the battery cell 30, protecting the positive and negative terminals of the battery cell 30 from damage and preventing the battery cell 30 from being contaminated by dust, dirt and other impurities during manufacturing and transportation.

[0056] In one embodiment, such as Figure 6 As shown, the battery assembly also includes a protection structure 60, which is disposed at one end of the battery assembly having a battery protection plate and covers the tab 31 and the outside of the battery protection plate.

[0057] Specifically, in this embodiment, the protective structure 60 is hot melt adhesive.

[0058] It is worth noting that by setting up the protective structure 60, the battery protection board, the tabs 31 and the nickel sheet 20 are structurally protected to prevent them from being exposed to the outside and being contaminated or damaged.

[0059] In one embodiment, such as Figure 4 As shown, the tab 31 and the bent portion 212 are adapted to bend together toward the first surface 11, as... Figure 5 As shown, along the thickness direction of the circuit board 10, the distance from the first surface 11 to the tab 31 is H, and the thickness of the electronic component is h, satisfying H≤h.

[0060] Specifically, in this embodiment, along the thickness direction of the circuit board 10, the distance H from the first surface 11 to the tab 31 is less than the thickness h of the electronic component.

[0061] It should be noted that after the tab 31 and the bending portion 212 are bent together toward the first surface 11, the tab 31 does not protrude from the surface of the electronic component along the length direction of the battery assembly, ensuring that the bending of the tab 31 and the bending portion 212 does not occupy additional space of the battery assembly in the length direction.

[0062] To encapsulate the battery assembly of this embodiment, firstly, the second connecting piece 22 is attached to the second surface 12 of the circuit board 10, and the main body 211 of the first connecting piece 21 is disposed in the clearance groove 131 of the third surface 13, with the bent portion 212 of the first connecting piece 21 extending out of the clearance groove 131; then, the two ends of the top seal 40 of the cell 30 are bent at 90° and fixed to the side seals 50 on both sides with PUR adhesive, and the tab 31 is bent at 90°; then, the tab 31 of the cell 30 is directly attached to the first connecting piece 21, and the tab 31 is connected to the first connecting piece 21 by laser spot welding; the nickel sheet 20 and the tab 31 are bent at 90° along the notch 213 of the first connecting piece 21, with the bent portion 212 of the nickel sheet 20 abutting against the first surface 11 of the circuit board 10; finally, the head of the cell 30 is encapsulated with hot melt adhesive.

[0063] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the present invention.

Claims

1. A battery protection board, characterized in that, include: The circuit board (10) has a first surface (11) and a second surface (12) that are arranged at a relative interval; Nickel sheet (20), the nickel sheet (20) includes a first connecting piece (21) and a second connecting piece (22), the first connecting piece (21) is connected to the second connecting piece (22) and forms a bend, the second connecting piece (22) is connected to the second surface (12), along the thickness direction of the circuit board (10), the first connecting piece (21) extends toward the first surface (11) and crosses the first surface (11); Electronic components are disposed on the first surface (11).

2. The battery protection board according to claim 1, characterized in that, The first connecting piece (21) includes a main body (211) and a bent portion (212). The bent portion (212) is connected to the main body (211). Along the thickness direction of the circuit board (10), the main body (211) extends toward and across the first surface (11). The bent portion (212) is adapted to bend to fit against the first surface (11).

3. The battery protection board according to claim 2, characterized in that, A notch (213) is provided at the connection between the main body (211) and the bent part (212).

4. The battery protection board according to claim 2, characterized in that, A pre-bending line is provided at the connection between the main body (211) and the bending part (212).

5. The battery protection board according to any one of claims 2-4, characterized in that, The circuit board (10) also has a third surface (13), which is perpendicular to the first surface (11) and the second surface (12) respectively. A clearance groove (131) is provided on the third surface (13), the main body (211) is located in the clearance groove (131), and the bent part (212) extends out of the clearance groove (131).

6. A battery assembly, characterized in that, include: The battery protection board according to any one of claims 1 to 5; A battery cell (30) is disposed near the second surface (12) of the circuit board (10). The battery cell (30) includes a tab (31) connected to the first connecting piece (21). The tab (31) and the first connecting piece (21) are adapted to bend together toward the first surface (11). The first connecting piece (21) is adapted to bend to fit against the first surface (11).

7. The battery assembly according to claim 6, characterized in that, The battery assembly also includes a top seal (40) and a side seal (50). The top seal (40) is disposed between the battery cell (30) and the battery protection board. The side seals (50) are disposed on both sides of the battery cell (30) and connected to the top seal (40).

8. The battery assembly according to claim 6, characterized in that, The battery assembly further includes a protective structure (60), which is disposed at one end of the battery assembly having the battery protection plate and covers the tab (31) and the outside of the battery protection plate.

9. The battery assembly according to claim 8, characterized in that, The protective structure (60) is made of hot melt adhesive.

10. The battery assembly according to claim 6, characterized in that, The battery protection board is the battery protection board of claim 2. The tab (31) and the bending portion (212) are adapted to bend together toward the first surface (11). Along the thickness direction of the circuit board (10), the distance from the first surface (11) to the surface of the tab (31) is H, and the thickness of the electronic component is h, satisfying H≤h.

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