Square lithium battery with built-in BMS

Abstract

The utility model relates to the technical field of lithium batteries, in particular to a square lithium battery with a built-in BMS (Battery Management System), which comprises a battery body, the battery body comprises an upper cover and a protective shell, a battery cell is arranged in the protective shell, the upper cover covers the open end of the protective shell in a sealing manner, a pole is arranged on the end surface, deviating from the battery cell, of the upper cover, and the battery cell is arranged in the pole. A battery cell is arranged on the upper cover, a BMS plate is arranged on the end face, facing the battery cell, of the upper cover, a connecting column is arranged on the BMS plate, facing the battery cell, the connecting column is electrically connected to the battery cell, an insulation protection piece is arranged on the upper cover, facing the BMS plate, the insulation protection piece wraps the BMS plate, and the connecting column penetrates through the insulation protection piece. The utility model aims to more safely and stably manage the square lithium battery.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a square lithium battery with a built-in BMS. Background Art

[0002] Lithium battery is an important electric energy storage device. Because of its rechargeable nature, it is widely used in mobile phones, electric vehicles, energy storage systems and other fields. Also because of the repeated rechargeability of lithium batteries, in order to improve the controllable performance of the battery itself and facilitate the control of the working and charging status of lithium batteries, it is necessary to set up a BMS to manage the lithium battery itself. BMS is the battery management system (Battery Management System), which can control and manage the output power of lithium batteries. However, after setting up a BMS board in the lithium battery, the formation operation of the battery itself will become quite complicated.

[0003] In the related art, a BMS board is provided in a lithium battery, but it is provided at the outer edge of the lithium battery and connected to the lithium battery itself. The BMS module is fixed on a carrier board. When the BMS module is in use, it is exposed to the outside of the battery and lacks protection. Utility Model Content

[0004] The main purpose of the utility model is to provide a square lithium battery with a built-in BMS, so as to be able to manage the square lithium battery more safely and stably.

[0005] To achieve the above-mentioned purpose, the utility model proposes a square lithium battery with a built-in BMS, comprising a battery body, wherein the battery body comprises an upper cover and a protective shell, a battery cell is arranged in the protective shell, the upper cover is sealed on the open end of the protective shell, a pole is arranged on the end face of the upper cover facing away from the battery cell, a BMS board is arranged on the end face of the upper cover facing the battery cell, the BMS board is provided with a connecting column facing the battery cell, the connecting column is electrically connected to the battery cell, the upper cover is provided with an insulating protective part facing the BMS board, the insulating protective part is wrapped around the BMS board, and the connecting column is penetrated by the insulating protective part.

[0006] In one embodiment of the present application, the poles are provided with two groups, the two poles are arranged at intervals, the connecting posts are provided with two groups, the connecting posts are arranged corresponding to the poles, the battery cell is provided with a core positive electrode and a core negative electrode relative to the connecting posts, and the two connecting posts are electrically connected to the core positive electrode and the core negative electrode, respectively.

[0007] In one embodiment of the present application, the pole is provided with an insulating sleeve, the insulating sleeve is wrapped around the periphery of the pole, the pole is penetrated by a connecting hole, and the connecting hole is penetrated through the end surface of the connecting column away from the core positive electrode and the core negative electrode.

[0008] In one embodiment of the present application, the upper cover and the BMS board are correspondingly provided with explosion-proof holes, the explosion-proof holes are connected to the battery cells, the explosion-proof holes are located between the two poles, and an explosion-proof plate is provided at one end of the BMS board away from the upper cover, and the explosion-proof plate is covered on the explosion-proof hole.

[0009] In one embodiment of the present application, the insulating protection member is provided with a protection portion relative to the explosion-proof hole, and the protection portion is connected to the BMS board and wrapped around the outer edge of the explosion-proof hole.

[0010] In one embodiment of the present application, the upper cover, the BMS board, and the insulating protective member are relatively penetrated with injection holes, the injection hole is located between the two poles and is spaced apart from the explosion-proof hole, the insulating protective member is provided with a protective portion relative to the injection hole, the protective portion is wrapped around the injection hole, the upper cover is provided with a sealing sheet relative to the injection hole, and the sealing sheet covers the injection hole.

[0011] In one embodiment of the present application, a matching groove is provided on the end surface of the upper cover facing away from the BMS board relative to the injection hole, the matching groove and the injection hole are coaxially arranged, the diameter of the matching groove is larger than the diameter of the injection hole, and the sealing sheet is connected to the matching groove and covers the injection hole.

[0012] The technical solution of the utility model adopts the method of structurally dividing the square lithium battery into an upper cover and a protective shell. The protective shell is provided with a battery cell for storing electrical energy or discharging. The protective shell is provided with an open end, and the upper cover and the protective shell are separated by the open end. Generally, the protective shell and the upper cover are made of aluminum, which can better protect the battery. The upper cover and the protective shell are sealed by a full circle of laser welding. The end face of the upper cover facing away from the battery cell is convexly provided with a pole. There are two groups of poles of the square lithium battery, and both are arranged on the same end face of the upper cover. The two poles are arranged at intervals, representing the positive and negative poles respectively. Screw holes or screws can be provided on the poles, so that the battery can be more conveniently connected to peripherals. The screw holes, screws or other stable connection structures can be arranged as required. A BMS board is provided on the end face of the upper cover facing the battery cell, which can save more internal space of the battery and avoid the BMS board occupying too much space, which affects the power The performance of the battery itself, and the BMS board connected to the upper cover can more stably connect the poles to facilitate the BMS board to control the battery operation, and the upper cover can support the BMS board and effectively protect the BMS board. The BMS board is provided with connecting posts facing the battery cells, and the connecting posts are directly connected to the battery cells, so that various sensors and MCU on the BMS board can more directly control the state of the battery cells and the charging state, and after being processed by the MCU, the electricity can also be transferred to the poles by relying on the connecting posts, which is convenient for the use of the battery. The upper cover is also provided with an insulating protective part facing the battery cells, and the BMS board is between the insulating protective part and the upper cover, which is used to separate the BMS board from the solution in the battery cells to avoid damage to the BMS board causing the battery to fail to work. The connecting posts are passed through the insulating protective part to better connect the battery cells. Through the above structure, the square lithium battery can be managed more safely and stably, making its working performance better. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0014] Figure 1 This is a structural schematic diagram of an embodiment of a square lithium battery with a built-in BMS of the utility model;

[0015] Figure 2 This is a cross-sectional view of an embodiment of a square lithium battery with a built-in BMS of the utility model;

[0016] Figure 3 for Figure 2 A partial enlarged view of point A in the middle.

[0017] Description of Figure Numbers:

[0018] 1. Battery body; 2. Upper cover; 21. Post; 22. Insulating sleeve; 23. Connection hole; 3. BMS board; 31. Connection post; 4. Explosion-proof hole; 41. Explosion-proof plate; 5. Insulating protection part; 51. Protection part; 52. Protection part; 6. Liquid injection hole; 61. Matching groove; 62. Sealing sheet; 7. Protective shell; 8. Battery cell; 81. Core positive electrode; 82. Core negative electrode.

[0019] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0021] Reference Figures 1 to 3 In one embodiment of the utility model, a square lithium battery with a built-in BMS is proposed, including a battery body 1, the battery body 1 includes an upper cover 2 and a protective shell 7, a battery cell 8 is arranged in the protective shell 7, the upper cover 2 is sealed on the open end of the protective shell 7, the end surface of the upper cover 2 facing away from the battery cell 8 is provided with a pole 21, the end surface of the upper cover 2 facing the battery cell 8 is provided with a BMS board 3, the BMS board 3 is provided with a connecting column 31 facing the battery cell 8, the connecting column 31 is electrically connected to the battery cell 8, the upper cover 2 is provided with an insulating protective member 5 facing the BMS board 3, the insulating protective member 5 is wrapped around the BMS board 3, and the connecting column 31 is penetrated by the insulating protective member 5.

[0022] In a square lithium battery with a built-in BMS in the present application, the square lithium battery is structurally divided into an upper cover 2 and a protective shell 7. A battery cell 8 is arranged in the protective shell 7 for storing electrical energy or discharging. The protective shell 7 is provided with an open end, through which the upper cover 2 and the protective shell 7 are separated. Generally, the protective shell 7 and the upper cover 2 are made of aluminum, which can better protect the battery. The upper cover 2 and the protective shell 7 are sealed by a full circle of laser welding. The end surface of the upper cover 2 facing away from the battery cell 8 is convexly provided with a pole 21. There are two groups of poles 21 of the square lithium battery, and both are arranged on the same end surface of the upper cover 2. The two poles 21 are arranged at intervals, representing the positive electrode and the negative electrode respectively. Screw holes or screws can be provided on the poles 21, so that the battery can be more conveniently connected to peripherals. Screw holes, screws or other stable connection structures can be arranged as needed. A BMS board 3 is provided on the end surface of the upper cover 2 facing the battery cell 8, which can save more internal space of the battery and avoid the BMS board 3 occupying too much space, which affects the battery The BMS board 3 is connected to the upper cover 2 and can be more stably connected to the pole 21, which is convenient for the BMS board 3 to control the battery operation. The upper cover 2 can support the BMS board 3 and effectively protect the BMS board 3. The BMS board 3 is provided with a connecting column 31 facing the battery cell 8. The connecting column 31 is directly connected to the battery cell 8, so that various sensors and MCU on the BMS board 3 can more directly control the state and charging state of the battery cell 8, and after being processed by the MCU, the electricity can also be transmitted to the pole 21 by relying on the connecting column 31, which is convenient for the use of the battery. The upper cover 2 is also provided with an insulating protective member 5 facing the battery cell 8. The BMS board 3 is located between the insulating protective member 5 and the upper cover 2, which is used to separate the BMS board 3 from the solution in the battery cell 8 to avoid damage to the BMS board 3 causing the battery to fail to work. The connecting column 31 is penetrated by the insulating protective member 5, which can better connect the battery cell 8. The above structure can manage the square lithium battery more safely and stably, so that its working performance is better.

[0023] Furthermore, the BMS board 3 is a battery management system (Battery Management System), which can control and manage the output of the lithium battery so that the battery can stably output voltages of different sizes such as 1.5V, 3.6V, 5V, 9V, etc. to meet the power supply requirements of different devices. The BMS board 3 is configured with an MCU and a series of other modules, including: the MCU will detect the battery temperature in real time. When the detected temperature exceeds the highest allowable charging temperature of the battery, the high-temperature charging protection is triggered to stop charging the battery. When the detected temperature is lower than the lowest allowable charging temperature of the battery, the low-temperature charging protection is triggered to stop charging the battery; the power module: mainly responsible for power supply to the entire system; the BMS module: mainly responsible for battery-related protection, such as undervoltage protection and overvoltage protection; the signal acquisition module: mainly responsible for battery cell 8 temperature acquisition, battery cell 8 voltage acquisition, battery cell 8 current acquisition, output voltage acquisition, output current acquisition, charging voltage acquisition, and charging current acquisition; the communication module: mainly responsible for communicating with external devices, and can directly upload information such as battery cell 8 voltage, power, temperature, number of cycles, and battery charging and discharging status to external devices; the charging and discharging management module: mainly responsible for controlling the charging and discharging of the battery; the MCU: as a microcontroller, is responsible for controlling the operation of the entire system.

[0024] Combined with reference Figures 1 to 3 In one embodiment of the present application, two groups of poles 21 are provided, and the two poles 21 are arranged at intervals. Two groups of connecting posts 31 are provided, and the connecting posts 31 are arranged corresponding to the poles 21. The battery cell 8 is provided with a core positive electrode 81 and a core negative electrode 82 relative to the connecting posts 31, and the two connecting posts 31 are electrically connected to the core positive electrode 81 and the core negative electrode 82 respectively.

[0025] In a square lithium battery with a built-in BMS in the present application, there are two groups of poles 21, representing the positive and negative poles of the battery respectively. The two groups of poles 21 are arranged at intervals, and the connecting column 31 and the pole 21 are arranged coaxially. The connecting column 31 is electrically connected to the core positive pole 81 and the core negative pole 82, and the relevant information is transmitted to the MCU. After the MCU processes the status information of the battery cell 8, it will transmit electricity to the pole 21 through the connecting column 31, so that the stability of the entire battery is stronger.

[0026] Combined with reference Figure 1 to Figure 2 In one embodiment of the present application, the pole 21 is provided with an insulating sleeve 22, which is wrapped around the periphery of the pole 21. The pole 21 is penetrated by a connecting hole 23, which is penetrated by the end surface of the connecting column 31 away from the core positive electrode 81 and the core negative electrode 82.

[0027] In a square lithium battery with a built-in BMS of the present application, an insulating sleeve 22 is provided on the pole 21, and the insulating sleeve 22 is wrapped around the pole 21, which can improve the safety of the battery during use and avoid battery leakage. A connecting hole 23 is provided in the pole 21, and the connecting hole 23 is penetrated through the connecting column 31, so that the battery can be easily connected to an external device and the battery can be easy to use.

[0028] Combined with reference Figures 1 to 3 In one embodiment of the present application, the upper cover 2 and the BMS board 3 are correspondingly provided with explosion-proof holes 4, the explosion-proof hole 4 is connected to the battery cell 8, the explosion-proof hole 4 is located between the two poles 21, and an explosion-proof piece 41 is provided at one end of the BMS board 3 away from the upper cover 2, and the explosion-proof piece 41 is covered on the explosion-proof hole 4.

[0029] In a square lithium battery with a built-in BMS in the present application, an explosion-proof hole 4 is correspondingly opened on the upper cover 2 and the BMS board 3, and an explosion-proof plate 41 is provided at the end of the BMS board 3 away from the upper cover 2. The explosion-proof plate 41 is coated on the explosion-proof hole 4, which is also made of aluminum material and is very thin. When a problem occurs in the battery, after the battery cell 8 electrolyzes a large amount of gas, the explosion-proof plate 41 can be urgently crushed and pressure-released to avoid safety hazards of the battery. Connection with the BMS board 3 can protect the BMS board 3 to the maximum extent and prevent the liquid in the battery cell 8 from corroding the BMS board 3.

[0030] Combined with reference Figures 2 to 3 In one embodiment of the present application, the insulating protection member 5 is provided with a protection portion 51 relative to the explosion-proof hole 4 , and the protection portion 51 is connected to the BMS board 3 and wrapped around the outer edge of the explosion-proof hole 4 .

[0031] In a square lithium battery with a built-in BMS in the present application, an insulating protective member 5 is provided with a protective portion 51 relative to the explosion-proof hole 4, which is wrapped around the outer edge of the explosion-proof hole 4. It can protect the BMS board 3 without affecting the normal operation of the explosion-proof plate 41, thereby improving the safety performance of the battery.

[0032] Combined with reference Figures 2 to 3 In one embodiment of the present application, a liquid injection hole 6 is relatively penetrated on the upper cover 2, the BMS board 3, and the insulating protection member 5. The liquid injection hole 6 is between the two poles 21 and is spaced apart from the explosion-proof hole 4. The insulating protection member 5 is provided with a protective portion 52 relative to the liquid injection hole 6. The protective portion 52 is wrapped around the liquid injection hole 6. The upper cover 2 is provided with a sealing sheet 62 relative to the liquid injection hole 6. The sealing sheet 62 covers the liquid injection hole 6.

[0033] In a square lithium battery with a built-in BMS in the present application, an injection hole 6 is relatively penetrated on the upper cover 2, the BMS board 3, and the insulating protective member 5, and the battery can be injected through this hole, so that the battery is easy to assemble. The injection hole 6 passes through the upper cover 2 to the insulating protective member 5. At the same time, the insulating protective member 5 is provided with a protective portion 52 relative to the injection hole 6. The protective portion 52 is wrapped around the injection hole 6 to prevent the battery liquid from splashing on the BMS board 3 during the injection process, causing damage to the BMS board 3, thereby improving the service life of the battery.

[0034] Combined with reference Figure 3 In one embodiment of the present application, a mating groove 61 is provided on the end surface of the upper cover 2 facing away from the BMS board 3 relative to the injection hole 6. The mating groove 61 and the injection hole 6 are coaxially arranged. The diameter of the mating groove 61 is larger than the diameter of the injection hole 6. The sealing sheet 62 is connected to the mating groove 61 and covers the injection hole 6.

[0035] In a square lithium battery with a built-in BMS in the present application, a mating groove 61 is provided on the end surface of the upper cover 2 facing away from the BMS board 3 relative to the injection hole 6. The diameter of the mating groove 61 is larger than the injection hole 6. The sealing sheet 62 is installed through the mating groove 61, so that the bottom of the sealing sheet 62 can be abutted against the outer edge of the injection hole 6. The sealing sheet 62 is then welded and sealed by laser, so that the sealing sheet 62 can firmly block the injection hole 6 to avoid leakage. The above structure can effectively improve the safety performance of the battery, and the square lithium battery can be managed more safely and stably.

[0036] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate an orientation or position relationship based on the orientation or position relationship shown in the drawings, it is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0037] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A square lithium battery with a built-in BMS, comprising a battery body, characterized in that: The battery body includes an upper cover and a protective shell, wherein a battery cell is arranged in the protective shell, the upper cover is sealed on the open end of the protective shell, the end surface of the upper cover facing away from the battery cell is provided with a pole, the end surface of the upper cover facing the battery cell is provided with a BMS board, the BMS board is provided with a connecting column facing the battery cell, the connecting column is electrically connected to the battery cell, the upper cover is provided with an insulating protective part facing the BMS board, the insulating protective part is wrapped around the BMS board, and the connecting column is penetrated by the insulating protective part.

2. A square lithium battery with a built-in BMS according to claim 1, characterized in that: The poles are provided with two groups, and the two poles are arranged at intervals. The connecting posts are provided with two groups, and the connecting posts are arranged corresponding to the poles. The battery cell is provided with a core positive electrode and a core negative electrode relative to the connecting posts, and the two connecting posts are electrically connected to the core positive electrode and the core negative electrode respectively.

3. A square lithium battery with a built-in BMS according to claim 2, characterized in that: The pole is provided with an insulating sleeve, the insulating sleeve is wrapped around the periphery of the pole, the pole is penetrated with a connecting hole, and the connecting hole is penetrated through the end surface of the connecting post away from the core positive electrode and the core negative electrode.

4. A square lithium battery with a built-in BMS according to any one of claims 1 to 3, characterized in that: The upper cover and the BMS board are correspondingly provided with explosion-proof holes, the explosion-proof holes are connected to the battery cells, the explosion-proof holes are located between the two poles, and an explosion-proof sheet is provided at one end of the BMS board away from the upper cover, and the explosion-proof sheet is covered on the explosion-proof hole.

5. A square lithium battery with built-in BMS according to claim 4, characterized in that: The insulating protection member is provided with a protection portion relative to the explosion-proof hole, and the protection portion is connected to the BMS board and wrapped around the outer edge of the explosion-proof hole.

6. A square lithium battery with a built-in BMS according to claim 4, characterized in that: The upper cover, the BMS board, and the insulating protective member are relatively penetrated with injection holes, the injection hole is located between the two poles and is spaced apart from the explosion-proof hole, the insulating protective member is provided with a protective portion relative to the injection hole, the protective portion is wrapped around the injection hole, the upper cover is provided with a sealing sheet relative to the injection hole, and the sealing sheet covers the injection hole.

7. A square lithium battery with a built-in BMS according to claim 6, characterized in that: The end surface of the upper cover facing away from the BMS board is provided with a matching groove relative to the injection hole. The matching groove and the injection hole are coaxially arranged. The diameter of the matching groove is larger than the diameter of the injection hole. The sealing sheet is connected to the matching groove and covers the injection hole.

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