Positioning jig and battery assembly

Abstract

This application discloses a positioning fixture and a battery assembly. The battery assembly includes a cell support and a battery protection board, with the battery protection board disposed on the cell support. The positioning fixture includes a base and a first positioning post. The first end of the first positioning post is connected to the base, and the second end of the first positioning post extends in a direction away from the base. The base is used to support the cell support, and the first positioning post is used to sequentially pass through the first positioning hole of the cell support and the second positioning hole of the battery protection board to position the cell support and the battery protection board. This improves the alignment accuracy of the pads of the battery protection board and the tabs of the cell, enabling reliable welding between the pads of the battery protection board and the tabs of the cell, avoiding problems such as misaligned welding and incomplete welding, thereby improving the yield rate of the battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a positioning fixture and a battery assembly. Background Technology

[0002] Currently, most electronic devices such as mobile phones and laptops are powered by batteries. The battery usually has an integrated battery protection board, which can protect the battery during charging and discharging to avoid problems such as overcharging, over-discharging, and short circuits.

[0003] In related technologies, taking laptops as an example, to improve the battery life of laptops, multi-cell batteries are often used. To improve the overall integrity of multi-cell batteries, cell brackets are used to support and install the aforementioned cells and battery protection boards. To simplify the battery assembly process, welding processes are performed on the cell tabs and battery protection board pads within the cell bracket. However, due to the poor positioning accuracy of the cell bracket for the battery protection board in related technologies, misalignment occurs between the battery protection board pads and the cell tabs, leading to problems such as misaligned soldering and cold solder joints, thus reducing the battery yield. Utility Model Content

[0004] This application discloses a positioning fixture and a battery assembly to solve the problem of poor positioning accuracy of the battery cell bracket for the battery protection board in related technologies.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows: In a first aspect, embodiments of this application disclose a positioning fixture for positioning and cooperating with a battery assembly. The battery assembly includes a cell support and a battery protection board, with the battery protection board disposed on the cell support. The positioning fixture includes a base and a first positioning post. The first end of the first positioning post is connected to the base, and the second end of the first positioning post extends in a direction away from the base. The base is used to support the cell bracket, and the first positioning post is used to pass through the first positioning hole of the cell bracket and the second positioning hole of the battery protection board in sequence to position the cell bracket and the battery protection board.

[0006] Secondly, this application discloses a battery assembly for positioning and cooperating with a positioning fixture. The positioning fixture includes a base and a first positioning post, the first positioning post being disposed on the base. The battery assembly includes a cell support and a battery protection board. The battery protection board is disposed on the cell support, and the cell support is used to be placed on the base; The bottom wall of the cell support has a first positioning hole, and the battery protection board has a second positioning hole. The first positioning hole and the second positioning hole are respectively used to fit over the first positioning post.

[0007] The technical solution adopted in this application can achieve the following technical effects: The positioning fixture disclosed in this application improves upon related technologies. By setting a first positioning post on the base, and using the first positioning post to pass through the first positioning hole of the cell bracket and the second positioning hole of the battery protection board in sequence, the cell bracket and the battery protection board can be precisely positioned. This improves the alignment accuracy of the solder pads of the battery protection board and the tabs of the cell, enabling reliable welding between the solder pads of the battery protection board and the tabs of the cell, avoiding problems such as misaligned soldering and incomplete soldering, and thus improving the yield rate of the battery. Attached Figure Description

[0008] Figure 1 This is one of the exploded structural diagrams of the positioning fixture and battery assembly disclosed in the embodiments of this application; Figure 2 This is a second exploded structural diagram of the positioning fixture and battery assembly disclosed in the embodiments of this application; Figure 3 This is a schematic diagram of the assembly structure of the positioning fixture and battery assembly disclosed in the embodiments of this application; Figure 4 This is a schematic diagram of the structure of the first positioning post disclosed in an embodiment of this application.

[0009] Explanation of reference numerals in the attached figures: 100-Positioning fixture, 110-Base, 111-Mounting groove, 120-First positioning post, 121-Groove, 122-First elastic part, 123-Second elastic part, 124-Chamfered structure, 130-Second positioning post 200-Battery assembly, 210-Cell bracket, 211-First positioning hole, 212-Third positioning hole, 213-Third positioning post, 220-Battery protection board, 221-Second positioning hole, 222-Fourth positioning hole, 223-Supporting pad, 230-Cell, 231-Taper. Detailed Implementation

[0010] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0011] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more.

[0012] The technical solutions disclosed in the various embodiments of this application are described in detail below with reference to the accompanying drawings.

[0013] In related technologies, in order to increase battery capacity, a multi-cell battery structure is often used. Multiple cells are fixed by a cell bracket. At the same time, a battery protection board is also set on the cell bracket. The battery protection board is fixed and electrically connected to the cells by welding.

[0014] To simplify the battery assembly process, the battery cell tabs and battery protection board pads are directly welded and fixed onto the cell bracket. The cell bracket has a cell mounting area and a battery protection board mounting area. The battery protection board is positioned and installed through the boundary of the battery protection board mounting area, which can be a mounting groove or a raised structure. However, due to unavoidable dimensional tolerances during the cell bracket manufacturing process, the positioning accuracy of the battery protection board is poor. This leads to misalignment between the battery protection board pads and the cell tabs, resulting in issues such as misaligned soldering and cold solder joints, thus reducing the battery yield.

[0015] Based on the above issues, please refer to Figures 1 to 4 This application discloses a positioning fixture 100, which can be used to position and cooperate with a battery assembly 200. The battery assembly 200 may include a cell support 210, a battery protection board 220, and a cell 230. The battery protection board 220 is disposed on the cell support 210 and has solder pads 223. The cell 230 has tabs 231, which are metal conductors that lead out the positive and negative electrodes from the cell 230. The solder pads 223 of the battery protection board 220 and the tabs 231 of the cell 230 are fixed and electrically connected by welding. The battery protection board 220 can protect the cell 230 to prevent the cell 230 from being in an overcharged state, an over-discharged state, an overcurrent state, a short circuit state, or an ultra-high temperature charge and discharge state.

[0016] The aforementioned positioning fixture 100 may include a base 110 and a first positioning post 120. The first end of the first positioning post 120 is connected to the base 110, and the second end of the first positioning post 120 extends away from the base 110. The first positioning post 120 and the base 110 can be an integral structure or manufactured separately and then assembled together by bonding, snap-fitting, or other methods. The base 110 can be used to support the cell support 210. The cell support 210 has a first positioning hole 211, and the battery protection board 220 has a second positioning hole 221. When the cell support 210 is placed on the base 110, the first positioning post 120 can sequentially pass through the first positioning hole 211 of the cell support 210 and the second positioning hole 221 of the battery protection board 220, thereby positioning the cell support 210 and the battery protection board 220, ensuring accurate alignment of the solder pads 223 of the battery protection board 220 with the tabs 231 of the cell 230. After the pads 223 of the battery protection board 220 are soldered to the tabs 231 of the cell 230, the cell bracket 210 can be removed from the base 110. At this time, the first positioning post 120 is pulled out from the first positioning hole 211 and the second positioning hole 221. Then, labeling, encapsulation and other processes can be performed on the outside of the cell bracket 210.

[0017] It should be noted that the first positioning post 120 can be a cylinder, prism, etc., and the shapes of the first positioning hole 211 and the second positioning hole 221 match the first positioning post 120. Taking the cylindrical first positioning post 120 as an example, the first positioning hole 211 and the second positioning hole 221 are circular holes. To ensure that the first positioning post 120 can pass smoothly through the first positioning hole 211 and the second positioning hole 221, the diameter of the first positioning post 120 is slightly smaller than the diameter of the first positioning hole 211 and the second positioning hole 221. The difference between the diameter of the first positioning post 120 and the diameter of the first positioning hole 211 or the second positioning hole 221 can be less than 0.1 mm.

[0018] The number of first positioning posts 120 can be one, two, or more, depending on the dimensions of the cell bracket 210 and the battery protection board 220. When using one first positioning post 120, the cell bracket 210 and the battery protection board 220 may rotate relative to each other around the first positioning post 120. In the actual assembly process, the protruding ribs, limiting grooves, and other structures on the cell bracket 210 can be used for preliminary positioning of the cell bracket 210 and the battery protection board 220, which can limit the relative rotation of the cell bracket 210 and the battery protection board 220 to a certain extent. Then, the first positioning posts 120 are used to accurately position the cell bracket 210 and the battery protection board 220. Of course, to further improve the positioning accuracy, two or more first positioning posts 120 can also be set. Correspondingly, the number of first positioning holes 211 and second positioning holes 221 is equal to the number of first positioning posts 120. Using two-point or multi-point positioning, the relative translation and relative rotation of the cell bracket 210 and the battery protection board 220 can be effectively limited.

[0019] As described above, the positioning fixture 100 disclosed in this application improves upon related technologies. By setting a first positioning post 120 on the base 110, and using the first positioning post 120 to pass sequentially through the first positioning hole 211 of the cell bracket 210 and the second positioning hole 221 of the battery protection board 220, the cell bracket 210 and the battery protection board 220 can be precisely positioned. This improves the alignment accuracy of the solder pads 223 of the battery protection board 220 and the tabs 231 of the cell 230, enabling stable welding between the solder pads 223 of the battery protection board 220 and the tabs 231 of the cell 230, avoiding problems such as misaligned welding and incomplete welding, thereby improving the yield rate of the battery.

[0020] Considering the dimensional tolerances (difference between the maximum and minimum limit dimensions) existing in the manufacturing process of the first positioning post 120, the first positioning hole 211, and the second positioning hole 221, if the diameter of the first positioning post 120 is at its maximum limit dimension, while the diameter of the first positioning hole 211 or the second positioning hole 221 is at its minimum limit dimension, then the first positioning post 120 may be unable to pass through the first positioning hole 211 or the second positioning hole 221. To ensure that the first positioning post 120 can smoothly pass through the first positioning hole 211 and the second positioning hole 221, the first positioning post 120 can be an elastic structure.

[0021] For example, the first positioning post 120 can be made of materials such as plastic, silicone, or rubber, so that at least a portion of the first positioning post 120 can contract radially under stress, thereby ensuring that the first positioning post 120 can pass through the first positioning hole 211 and the second positioning hole 221. At the same time, the first positioning post 120 can also use elastic deformation to interfere with the first positioning hole 211 and the second positioning hole 221, further improving the reliability of the assembly of the first positioning post 120 with the first positioning hole 211 and the second positioning hole 221, and reducing the probability of relative rotation between the cell bracket 210 and the battery protection board 220.

[0022] In one optional embodiment of this application, such as Figure 1 and Figure 4 As shown, a groove 121 can be provided on the first positioning post 120, penetrating the side of the first positioning post 120, thereby dividing the first positioning post 120 into a first elastic portion 122 and a second elastic portion 123. The groove 121 provides clearance space for the first elastic portion 122 and the second elastic portion 123 to approach each other. The first elastic portion 122 and the second elastic portion 123 can approach each other under force, so that the radial dimension of the first positioning post 120 shrinks.

[0023] In specific application scenarios, when the diameter of the first positioning post 120 is too large to pass through the first positioning hole 211 or the second positioning hole 221, a force can be applied to the first elastic part 122 and / or the second elastic part 123 to bring the first elastic part 122 and the second elastic part 123 closer to each other. At this time, the radial dimension of the first positioning post 120 shrinks, making it easier to pass through the first positioning hole 211 or the second positioning hole 221. At the same time, the first elastic part 122 and the second elastic part 123 will also apply pressure to the hole wall of the first positioning hole 211 and the hole wall of the second positioning hole 221, respectively, improving the reliability of assembly.

[0024] like Figure 1 and Figure 4As shown, the first end of the first elastic portion 122 is connected to the base 110, and the second end of the first elastic portion 122 extends in a direction away from the base 110; the first end of the second elastic portion 123 is connected to the base 110, and the second end of the second elastic portion 123 extends in a direction away from the base 110. To facilitate the insertion of the first positioning pin 120 into the first positioning hole 211 and the second positioning hole 221, at least one of the second ends of the first elastic portion 122 and the second elastic portion 123 is provided with a chamfered structure 124. The chamfered structure 124 guides and cooperates with the first positioning hole 211 and the second positioning hole 221, enabling the first positioning pin 120 to smoothly insert into the first positioning hole 211 and the second positioning hole 221, avoiding jamming between the first positioning pin 120 and the first positioning hole 211 and the second positioning hole 221, and improving production efficiency.

[0025] In one optional embodiment of this application, the base 110 has a mounting groove 111 on its surface for supporting the battery cell bracket 210. The mounting groove 111 can be used to accommodate the battery cell bracket 210, and the first end of the first positioning post 120 is connected to the bottom wall of the mounting groove 111. When the battery cell bracket 210 is placed in the mounting groove 111, the bottom wall of the battery cell bracket 210 contacts the bottom wall of the mounting groove 111, and the side wall of the battery cell bracket 210 is in a limiting fit with the side wall of the mounting groove 111, so that the battery cell bracket 210 can be stably placed on the base 110, avoiding the problem of the battery cell bracket 210 shaking or tilting.

[0026] like Figures 1 to 3 As shown, the positioning fixture 100 may further include a second positioning post 130. The first end of the second positioning post 130 is connected to the base 110, and the second end of the second positioning post 130 extends in a direction away from the base 110. The second positioning post 130 and the base 110 can be an integral structure or manufactured separately and then assembled together by bonding, snap-fitting, or other methods. The second positioning post 130 can be located at the edge of the mounting groove 111. The side edge of the cell support 210 has a protruding ear, and a third positioning hole 212 is provided on the ear. When the cell support 210 is placed on the base 110, the second positioning post 130 can pass through the third positioning hole 212, thereby positioning the cell support 210 and further reducing the probability of the cell support 210 wobbling or tilting. In addition, the cell support 210 and the base 110 can also be fixed together by screws.

[0027] In one optional embodiment of this application, the number of first positioning posts 120 can be at least two, with at least two first positioning posts 120 spaced apart on the base 110. The number of first positioning holes 211 and the number of second positioning holes 221 are both equal to the number of first positioning posts 120. By using a two-point or multi-point positioning method, the relative translation and relative rotation between the cell support 210 and the battery protection board 220 can be effectively limited.

[0028] This application also discloses a battery assembly 200 for positioning and cooperating with the aforementioned positioning fixture 100. The positioning fixture 100 may include a base 110 and a first positioning post 120, with the first positioning post 120 disposed on the base 110. The battery assembly 200 may include a cell support 210 and a battery protection plate 220, with the battery protection plate 220 disposed on the cell support 210. The cell support 210 can be placed on the base 110. A first positioning hole 211 is formed in the bottom wall of the cell support 210, and a second positioning hole 221 is formed in the battery protection plate 220. The first positioning hole 211 and the second positioning hole 221 are respectively used to fit over the first positioning post 120. For the specific structure of the positioning fixture 100 and the battery assembly 200, please refer to the above description; this application will not elaborate further.

[0029] As described above, the battery assembly 200 disclosed in this application improves upon related technologies by opening a first positioning hole 211 on the cell support 210 and a second positioning hole 221 on the battery protection board 220. By utilizing the positioning holes 211 and 221 in conjunction with the positioning fixture 100, the cell support 210 and the battery protection board 220 can be precisely positioned. This improves the alignment accuracy between the solder pads 223 of the battery protection board 220 and the tabs 231 of the cell 230, enabling stable welding between the solder pads 223 of the battery protection board 220 and the tabs 231 of the cell 230, avoiding problems such as misaligned welding and incomplete welding, thereby improving the yield rate of the battery.

[0030] Considering that the battery protection board 220 contains multiple electrical components, such as control ICs (integrated circuits), MOSFETs (metal-oxide-semiconductor field-effect transistors), and switches, a position for the second positioning hole 221 can be reserved on the substrate of the battery protection board 220 during layout. When there is sufficient space for the electrical components, the second positioning hole 221 can be placed as close as possible to the center of the battery protection board 220 to improve positioning performance. The distance between the edge of the second positioning hole 221 and the electrical component can be greater than 0.3mm, specifically 0.35mm, 0.4mm, etc. This setting prevents interference between the electrical components and the positioning fixture 100, and also avoids leakage or short circuits caused by the electrical components being too close to the edge of the second positioning hole 221, thus improving the installation performance of the battery protection board 220.

[0031] In one optional embodiment of this application, based on the positioning of the battery protection board 220 and the cell support 210 using the first positioning post 120 described above, as follows: Figures 1 to 3 As shown, a third positioning post 213 can be provided on the bottom wall of the cell support 210, and a fourth positioning hole 222 can be opened on the battery protection board 220. The third positioning post 213 can pass through the fourth positioning hole 222. Combined with the positioning scheme of the first positioning post 120, the positioning accuracy of the battery protection board 220 and the cell support 210 can be further improved. Since the battery protection board 220 and the cell 230 are positioned with the cell support 210 as the reference when they are welded, the combination of the third positioning post 213 and the fourth positioning hole 222 can improve the matching degree between the solder pads 223 of the battery protection board 220 and the tabs 231 of the cell 230.

[0032] The above embodiments of this application focus on describing the differences between the various embodiments. As long as the different technical features between the various embodiments are not contradictory, they can be combined to form more specific embodiments. For the sake of brevity, they will not be described in detail here.

[0033] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A positioning fixture for positioning and engaging with a battery assembly (200), the battery assembly (200) including a cell support (210) and a battery protection board (220), the battery protection board (220) being disposed on the cell support (210), characterized in that, The positioning fixture (100) includes a base (110) and a first positioning post (120). The first end of the first positioning post (120) is connected to the base (110), and the second end of the first positioning post (120) extends in a direction away from the base (110); The base (110) is used to support the cell bracket (210), and the first positioning post (120) is used to pass through the first positioning hole (211) of the cell bracket (210) and the second positioning hole (221) of the battery protection plate (220) in sequence to position the cell bracket (210) and the battery protection plate (220).

2. The positioning fixture according to claim 1, characterized in that, The first positioning post (120) is an elastic structure, and at least a portion of the first positioning post (120) can contract radially under stress.

3. The positioning fixture according to claim 2, characterized in that, The first positioning post (120) is provided with a groove (121) that penetrates the side of the first positioning post (120) to divide the first positioning post (120) into a first elastic part (122) and a second elastic part (123). The first elastic part (122) and the second elastic part (123) can move closer to each other under force so that the radial dimension of the first positioning post (120) shrinks.

4. The positioning fixture according to claim 3, characterized in that, The first end of the first elastic portion (122) is connected to the base (110), and the second end of the first elastic portion (122) extends in a direction away from the base (110); The first end of the second elastic portion (123) is connected to the base (110), and the second end of the second elastic portion (123) extends in a direction away from the base (110); At least one of the second end of the first elastic portion (122) and the second end of the second elastic portion (123) is provided with a chamfer structure (124), which is used to guide and cooperate with the first positioning hole (211) and the second positioning hole (221).

5. The positioning fixture according to claim 1, characterized in that, The base (110) has an installation groove (111) on its surface for supporting the battery cell bracket (210). The installation groove (111) is used to accommodate the battery cell bracket (210). The first end of the first positioning post (120) is connected to the bottom wall of the installation groove (111).

6. The positioning fixture according to claim 1, characterized in that, The positioning fixture (100) further includes a second positioning post (130), the first end of which is connected to the base (110), and the second end of which extends in a direction away from the base (110). The second positioning post (130) is used to pass through the third positioning hole (212) of the cell support (210) to position the cell support (210).

7. The positioning fixture according to any one of claims 1-6, characterized in that, The number of the first positioning posts (120) is at least two, and the at least two first positioning posts (120) are spaced apart on the base (110). The number of the first positioning holes (211) and the number of the second positioning holes (221) are equal to the number of the first positioning posts (120).

8. A battery assembly for positioning and engaging with a positioning fixture (100), the positioning fixture (100) comprising a base (110) and a first positioning post (120), the first positioning post (120) being disposed on the base (110), characterized in that, The battery assembly (200) includes: a cell support (210) and a battery protection board (220). The battery protection board (220) is disposed on the cell support (210), and the cell support (210) is used to be placed on the base (110); The bottom wall of the cell support (210) is provided with a first positioning hole (211), and the battery protection plate (220) is provided with a second positioning hole (221). The first positioning hole (211) and the second positioning hole (221) are respectively used to be sleeved outside the first positioning post (120).

9. The battery assembly according to claim 8, characterized in that, The battery protection board (220) is provided with multiple electrical components, and the distance between the edge of the second positioning hole (221) and the electrical components is greater than 0.3 mm.

10. The battery assembly according to claim 8, characterized in that, The bottom wall of the cell support (210) is provided with a third positioning post (213), and the battery protection plate (220) is provided with a fourth positioning hole (222). The third positioning post (213) passes through the fourth positioning hole (222).

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