Built-in BMS management module structure of rechargeable battery

Abstract

The utility model discloses a built-in BMS (Battery Management System) management module structure of a rechargeable battery, which comprises a shell formed by buckling and stamping an upper shell and a lower shell, a sealing ring arranged at the buckling and stamping part of the upper shell and the lower shell, a BMS management module arranged in a cavity of the shell and comprising a PCBA (Printed Circuit Board Assembly) main body, a positive electrode lead arranged at the top of the PCBA main body and a negative electrode lead arranged at the bottom of the PCBA main body, the positive lead penetrates through the upper shell and is arranged above the upper shell, a plurality of groups of negative contacts are uniformly distributed on the outer side wall of the PCBA main body, the negative contacts abut against the shell cavity, and the insulating sleeve is arranged at the penetrating position of the positive lead and the upper shell; compared with the prior art in which the PCBA main body is directly arranged in the battery shell, the protective structure at the PCBA main body of the BMS is optimized, so that the problem of short circuit and even explosion of the battery caused by erosion of the PCBA main body due to leakage of a battery cell under special conditions is solved, the use safety of the battery is remarkably improved, and the service life of the battery is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of rechargeable battery technology, and in particular relates to a structure of a built-in BMS management module for rechargeable batteries. Background Technology

[0002] With the rapid development of energy storage systems, the safety and reliability of rechargeable batteries, as core energy components, have attracted much attention. Lithium-ion batteries have become the mainstream choice due to their advantages such as high energy density and long cycle life. However, their internal chemical reactions are complex, and under abnormal conditions such as overcharging, over-discharging, high temperature or mechanical damage, they may cause safety hazards such as electrolyte leakage and thermal runaway.

[0003] To address the aforementioned risks, BMS (Battery Management System) management is crucial. A BMS is a lithium battery management system that automatically disconnects the circuit when the battery's internal voltage or temperature exceeds a threshold, preventing further battery deterioration. In traditional technologies, the BMS system's PCBA (Power Packaging Assembly Board) is typically mounted directly adjacent to the battery cell assembly. This structure lacks effective isolation and protection measures. When a battery cell leaks electrolyte due to manufacturing defects, external impact, or extreme operating conditions, the corrosive electrolyte directly corrodes the PCBA, causing a short circuit. The high heat generated by the short circuit may trigger thermal runaway and even lead to an explosion, seriously threatening user safety and stable equipment operation.

[0004] Therefore, industry professionals have developed a built-in management module structure that can effectively protect the BMS system, prevent leakage and corrosion, and improve the overall safety of the battery. Utility Model Content

[0005] The purpose of this utility model is to solve the problem in the prior art where the BMS system is directly installed inside the rechargeable battery casing, lacking effective isolation and protection. When the battery cell leaks due to manufacturing defects, external impact, or extreme operating conditions, the corrosive electrolyte can easily corrode the PCBA body and circuit connections of the BMS system, leading to short circuits, thermal runaway, or even explosions. Therefore, this utility model provides a rechargeable battery built-in BMS management module structure.

[0006] This utility model achieves the above objectives through the following technical solution: a rechargeable battery built-in BMS management module structure, including a shell, wherein the shell is formed by fastening and stamping an upper shell and a lower shell together;

[0007] A sealing ring is placed at the snap-fitting stamping point between the upper and lower outer shells;

[0008] The BMS management module is placed inside the outer shell cavity. It includes a PCBA body. A positive lead is provided on the top of the PCBA body. The positive lead passes through the upper shell and is positioned above it. Several sets of negative contacts are evenly distributed on the outer side wall of the PCBA body. The negative contacts abut against the outer shell cavity.

[0009] An insulating sleeve is placed at the point where the positive lead passes through the upper outer casing.

[0010] Furthermore, the upper outer shell has an annular groove at its snap-fit ​​end, and the lower outer shell has an annular protrusion at its snap-fit ​​end that matches the annular groove. The sealing ring is embedded in the annular groove, and the annular protrusion squeezes the sealing ring when snapped in place.

[0011] Furthermore, a PCBA protective base is sleeved on the outside of the BMS management module. Extended fixing components are provided on both sides of the cavity of the PCBA protective base. The PCBA body is fixed between the two sets of extended fixing components. Spring-loaded components that cooperate with the outer cavity are provided on both sides of the outer wall of the PCBA protective base.

[0012] Furthermore, the spring-loaded component is an elastic metal sheet evenly distributed circumferentially along the outer wall of the PCBA protective base. The elastic metal sheet includes a base fixedly connected to the PCBA protective base and a free end extending inclinedly towards the inner wall of the housing. The free end forms an angle of 30-60° with the inner wall of the housing.

[0013] Furthermore, a PTC protective pad is provided between the PCBA protective base and the lower outer shell cavity.

[0014] Beneficial effects: This utility model has a reasonable design, simple and stable structure, and strong practicality, and has the following beneficial effects:

[0015] 1. Enhanced sealing performance: The annular groove of the upper shell and the annular convex ridge of the lower shell cooperate to compress the sealing ring embedded in the groove, forming multiple sealing barriers, effectively preventing leakage from entering the module and significantly improving the module's sealing performance and reliability.

[0016] 2. Secure PCBA installation: A PCBA protective base is set on the outside of the BMS management module. The PCBA body is firmly clamped by the extended fasteners. The spring-loaded parts on the outer wall of the PCBA protective base elastically contact the inner wall of the outer shell to ensure the stable installation of the PCBA body.

[0017] 3. Ensure insulation safety: An insulating sleeve is installed at the point where the positive lead penetrates the upper outer casing to effectively isolate the positive lead from the outer casing, avoid short circuits, and prevent liquid leakage into the module.

[0018] 4. Enhanced overheat protection: A PTC protective pad is installed between the PCBA protection base and the lower housing cavity. When the internal temperature of the module rises abnormally, the resistance value of the PTC protective pad increases sharply with the temperature rise, automatically limiting the current and preventing safety hazards caused by overheating, thus providing overheat protection for the battery. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the present invention;

[0020] Figure 2 This is a schematic diagram of the exploded structure of this utility model;

[0021] Figure 3 This is a structural diagram of the BMS management module of this utility model.

[0022] In the diagram: 1-Outer shell, 2-Sealing ring, 3-BMS management module, 4-Insulating sleeve, 5-PCBA protective base, 6-Extended fastener, 7-Spring spring, 8-PTC protective gasket;

[0023] 101 - Upper casing, 102 - Lower casing, 301 - PCBA body, 302 - Positive lead, 303 - Negative contact. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] Example 1:

[0026] Combination Figure 1-3 The rechargeable battery built-in BMS management module structure shown includes a shell 1, which is made of steel plate as raw material and is processed into an upper shell 101 and a lower shell 102. The upper shell 101 and the lower shell 102 are designed to fit together tightly. They are interlocked by fastening and then pressure is applied by a high-precision stamping device to achieve a firm connection, so as to ensure the stability of subsequent internal components.

[0027] The sealing ring 2, which has a ring structure, is set at the snap-fit ​​stamping point of the upper outer shell 101 and the lower outer shell 102, so that it can tightly fill the snap-fit ​​gap between the upper outer shell 101 and the lower outer shell 102, forming a reliable sealing effect and preventing the electrolyte inside the battery from leaking into the outer shell 1.

[0028] BMS Management Module 3: This BMS management module 3 is the core component of the entire management module. It includes a PCBA body 301, which integrates a variety of precision circuits and sensor components. It can monitor various parameters of the battery in real time and respond quickly when the battery is in an abnormal condition. A positive lead 302 is fixedly connected to the top of the PCBA body 301. The positive lead 302 ensures that it can pass smoothly through the preset through hole of the upper shell 101 and extend to the top of the shell 1 so as to reliably connect with the positive terminal of the battery. Several sets of negative contacts 303 are evenly distributed on the outer side wall of the PCBA body 301. Each set of negative contacts 303 is made of a highly conductive metal alloy. The negative contacts 303 protrude slightly outward. When the BMS management module 3 is installed in the cavity of the shell 1, the negative contacts 303 can press tightly against the inner wall of the cavity of the shell 1 with appropriate pressure, thereby achieving a good electrical connection with the shell 1.

[0029] Insulating sleeve 4: Made of polytetrafluoroethylene (PTFE), it has excellent electrical insulation, high temperature resistance and chemical stability. The insulating sleeve 4 has a cylindrical structure, and its inner diameter is adapted to the outer diameter of the positive lead 302 to ensure that it can be tightly fitted on the positive lead 302. Its outer diameter matches the inner diameter of the preset through hole on the upper shell 101, so that the insulating sleeve 4 can be precisely embedded in the through hole, thereby completely isolating the positive lead 302 from the upper shell 101, effectively preventing short circuits between the positive lead 302 and the shell 1, and further improving the electrical safety and stability of the built-in management module of the rechargeable battery.

[0030] In this embodiment, the snap-fit ​​end of the upper outer shell 101 is provided with an annular groove. The inner wall of the groove is finely polished to ensure a tight fit with the sealing ring 2. The snap-fit ​​end of the lower outer shell 102 is provided with an annular protrusion that precisely matches the annular groove. The tolerance between the outer contour of the protrusion and the inner contour of the annular groove is controlled within ±0.05mm. The sealing ring 2 is completely fitted with the inner wall of the annular groove. When the annular protrusion is snapped into the annular groove, the sealing ring 2 undergoes elastic deformation under pressure, forming a dual sealing effect in the radial and axial directions.

[0031] In this embodiment, a PCBA protective base 5 is sleeved on the outside of the BMS management module 3. Its size matches the outer dimensions of the BMS management module 3. Extended fixing parts 6 are symmetrically arranged on both sides of the cavity of the PCBA protective base 5. The PCBA body 301 is fixed between the two sets of extended fixing parts 6. Two sets of spring-loaded parts 7 are arranged on each side of the outer wall of the PCBA protective base 5 to cooperate with the cavity of the outer shell 1. The spring-loaded parts 7 can ensure that the PCBA protective base 5 will not shake inside the outer shell 1. At the same time, it is an auxiliary support and will not interfere with the contact effect between the negative contact 303 and the cavity of the outer shell 1.

[0032] In this embodiment, the spring-loaded component 7 is an elastic metal sheet that is evenly distributed circumferentially along the outer wall of the PCBA protective base 5. The elastic metal sheet includes a base that is fixedly connected to the PCBA protective base 5 and a free end that extends obliquely toward the inner wall of the outer shell 1. The free end forms an angle of 30-60° with the inner wall of the outer shell 1. This angle can generate a continuous pre-tightening force between the free end and the inner wall of the outer shell 1, thereby ensuring the installation effect of the PCBA protective base 5.

[0033] In this embodiment, a PTC protective pad 8 is provided between the PCBA protective base 5 and the lower outer shell 102 cavity. The PTC protective pad 8 has a circular sheet structure. When the internal temperature of the module rises to the critical temperature (such as 85-95℃) due to abnormal operating conditions, the internal polymer of the PTC protective pad 8 expands due to heat, causing the resistance value to rise exponentially within a few seconds, automatically limiting the current flow and forming an over-temperature protection mechanism.

[0034] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0035] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A rechargeable battery built-in BMS management module structure, characterized in that: Includes a housing (1), which is formed by fastening and stamping an upper housing (101) and a lower housing (102); A sealing ring (2) is placed at the snap-fit ​​stamping point between the upper outer shell (101) and the lower outer shell (102); The BMS management module (3) is placed inside the cavity of the outer shell (1). It includes a PCBA body (301). A positive lead (302) is provided on the top of the PCBA body (301). The positive lead (302) passes through the upper outer shell (101) and is placed above it. Several sets of negative contacts (303) are evenly distributed on the outer side wall of the PCBA body (301). The negative contacts (303) abut against the cavity of the outer shell (1). An insulating sleeve (4) is placed at the point where the positive lead (302) passes through the upper outer casing (101).

2. The built-in BMS management module structure of a rechargeable battery according to claim 1, characterized in that: The upper outer shell (101) has an annular groove at its fastening end, and the lower outer shell (102) has an annular protrusion at its fastening end that matches the annular groove. The sealing ring (2) is embedded in the annular groove, and the annular protrusion squeezes the sealing ring (2) when fastened.

3. The built-in BMS management module structure of rechargeable battery according to claim 2, characterized in that: The BMS management module (3) is fitted with a PCBA protective base (5) on the outside. Both sides of the cavity of the PCBA protective base (5) are provided with extension fasteners (6). The PCBA body (301) is fixed between the two sets of extension fasteners (6). Both sides of the outer wall of the PCBA protective base (5) are provided with spring-loaded parts (7) that cooperate with the cavity of the outer shell (1).

4. The rechargeable battery built-in BMS management module structure according to claim 3, characterized in that: The spring-loaded component (7) is an elastic metal sheet that is evenly distributed circumferentially along the outer wall of the PCBA protective base (5). The elastic metal sheet includes a base that is fixedly connected to the PCBA protective base (5) and a free end that extends obliquely toward the inner wall of the outer shell (1). The free end forms an angle of 30-60° with the inner wall of the outer shell (1).

5. The built-in BMS management module structure of rechargeable battery according to claim 4, characterized in that: A PTC protective pad (8) is provided between the PCBA protective base (5) and the cavity of the lower outer shell (102).

Images