Battery module structure with self-disconnection protection function

Abstract

The present application relates to the field of lithium battery, specifically a battery module structure with self-break protection function, the battery module structure includes a module shell, the module shell is equipped with a battery module; the upper end of the battery module is equipped with a conductive connecting plate; the end of the conductive connecting plate is connected with a total wire leading end; the conductive connecting plate is connected with the total wire leading end through a break control mechanism.The present application discloses a battery module structure with self-break protection function, through the setting of the break control mechanism, the connection between the battery module and the external wire or lead can be cut off when the battery is inflated, preventing the safety problem caused by the continuous charging and discharging of the battery.

Description

Technical Field

[0001] This invention relates to the field of lithium batteries, specifically a battery module structure with self-disconnection protection function. Background Technology

[0002] Lithium-ion batteries have become a research hotspot in recent years due to their advantages such as environmental friendliness, high energy density, and long cycle life. They have been widely used in fields such as digital technology, energy storage, communications, and electric vehicles, especially in the electric vehicle sector, where they are being promoted at a growth rate of 50% per year.

[0003] Commercial lithium-ion power batteries can be classified into pouch batteries, cylindrical batteries, and square metal-cased batteries according to their shape and packaging material type.

[0004] Currently, lithium-ion power batteries can be classified into pouch batteries, cylindrical batteries, and square metal-cased batteries according to their shape, specifications, and casing materials.

[0005] Among them, soft-pack lithium-ion batteries use multi-layer aluminum-plastic composite film (aluminum-plastic film) as the outer shell material, which is easy to form and process. It has advantages such as high specific energy, low cost and strong model compatibility. Therefore, in recent years, the market share of soft-pack lithium-ion batteries in the electric vehicle field has been increasing year by year.

[0006] However, when a lithium-ion battery is overcharged, has lithium plating on the negative electrode, or reaches the end of its cycle life, the soft-pack lithium-ion battery will swell. When the battery continues to be charged and discharged, the swollen battery is prone to internal short circuits, which can lead to accidents such as smoke and fire.

[0007] To avoid the aforementioned accidents, a circuit breaker mechanism is proposed that can automatically disconnect the internal connections of the battery when it swells, preventing the battery from continuing to charge and discharge. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide a battery module structure with self-circuit breaking protection function.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0010] A battery module structure with self-disconnection protection function, the battery module structure includes a module housing, a battery module is disposed inside the module housing; a conductive connecting plate is disposed at the upper end of the battery module; a main wire lead-out terminal is connected to the end of the conductive connecting plate; the conductive connecting plate is connected to the main wire lead-out terminal through a circuit breaking control mechanism.

[0011] The circuit breaker control mechanism includes a connection part that connects the conductive connection plate to the lead-out end of the main conductor; the connection part includes a connector for connecting the conductive connection plate to the lead-out end of the main conductor.

[0012] The circuit breaker control mechanism further includes a positioning part, which includes a positioning block disposed inside the module housing, and the positioning block is connected to the connecting part.

[0013] The positioning block is connected to the connecting part through a bridging part.

[0014] The positioning block is made of a brittle material.

[0015] The circuit breaker control mechanism also includes a drive mechanism disposed inside the module for controlling the connection between the conductive connecting plate and the main conductor lead-out end. The drive mechanism includes an elastic component. The elastic component is connected to the bridging part through a positioning block. The elastic component is in a stretched state after assembly.

[0016] The battery module includes multiple individual batteries, with a partition between adjacent individual batteries; the driving mechanism is mounted on the partition, and the positioning block is mounted on the inner wall of the mold housing; the positioning block is located in the middle of the mold housing, and the driving mechanism is located at the lower end of the partition; the connection point between the positioning block and the inner wall of the mold housing and the connection point between the driving mechanism and the partition are staggered.

[0017] The positioning block includes a base block and an extension block, wherein the base block is connected to the extension block via a bridging block; the thickness of the bridging block is less than the thickness of the base block and the extension block.

[0018] Both the drive mechanism and the bridging part are connected to the extension block; the thickness of the base block is less than the thickness of the extension block.

[0019] The connection points between the bridging part and the connector, the connection points between the drive mechanism and the partition, and the connection points between the connecting block and the module housing are arranged in a triangular pattern.

[0020] The advantages of this invention are:

[0021] This invention discloses a battery module structure with self-disconnection protection function. By setting a circuit breaker control mechanism, the connection between the battery module and external wires or leads can be cut off when the battery swells, preventing safety problems caused by the continued charging and discharging of the battery. Attached Figure Description

[0022] The following is a brief explanation of the contents of each of the accompanying drawings and the markings in the drawings:

[0023] Figure 1 This is a schematic diagram of the structure of the first embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram of the structure of the second embodiment of the present invention.

[0025] Figure 3 This is a schematic diagram of the structure of the third embodiment of the present invention.

[0026] Figure 4 This is a cross-sectional view of the connection between the partition and the base in this invention.

[0027] Figure 5 This is a schematic diagram of the structure of the present invention, which adds a linkage belt between the bridging part, the positioning block and the elastic component.

[0028] The markings in the above figures are all:

[0029] 1. Positioning block, 2. Base, 3. Elastic component, 4. Bridging part, 5. Connector, 6. Separator, 7. Single cell, 8. Linkage belt, 9. Module housing, 10. Conductive connecting plate, 11. Main wire lead-out end. Detailed Implementation

[0030] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and the description of the preferred embodiments.

[0031] A battery module structure with self-disconnection protection function includes a module housing 9, within which a battery module is housed; a conductive connecting plate 10 is provided at the upper end of the battery module; a main lead-out terminal 11 is connected to the end of the conductive connecting plate 10; the conductive connecting plate 10 is connected to the main lead-out terminal 11 via a circuit breaker control mechanism. The battery module, conductive connecting plate 10, and main lead-out terminal 11 are typical battery module structures, the specific structure of which can be found in the accompanying drawings and existing technology, and will not be elaborated here. The innovation lies in the circuit breaker control mechanism provided between the connecting plate and the main lead-out terminal 11. This design allows for the disconnection of the battery module from external wires or leads when the battery swells, preventing safety issues caused by continued charging and discharging. The circuit breaker mechanism can be varied; any structure capable of detecting battery swelling and disconnecting the battery module from the outside world is acceptable. Specifically, the circuit breaker mechanism in this invention primarily includes a connecting portion for connecting the conductive connecting plate 10 to the main lead-out terminal 11. This connecting portion includes a connector 5 for connecting the conductive connecting plate 10 to the main lead-out terminal 11. The connector 5 ensures communication between the main lead-out terminal 11 and the conductive connecting plate 10 during normal battery module operation. When the battery module bulges, the connector 5 can be broken under external force. The connector 5 can be a connecting wire or a connecting solder joint, etc. Of course, the position of the above-mentioned connection part can also be set in other positions, only the names of the components connected at both ends are different. However, as long as the battery module is not connected to the outside world, it is acceptable. For example, the connection part of the present invention can be set at the positive tab of the battery cell, the negative tab of the battery cell, the welding point of the battery cell series connection, or the welding point of the module's total positive terminal, the welding point of the module's total negative terminal, etc. The specific modifications can be made according to actual design needs. The main embodiment disclosed in this invention describes the connection between the main lead-out end 11 and the conductive connecting plate 10. The invention describes the connection part and related structures, but this does not mean that the scope of protection of the invention is limited to the connection part and its structure at this location. In addition, the structure of the connector 5 in the invention can adopt a structure similar to the positioning block 1 described below, and can be a dumbbell-shaped, L-shaped, V-shaped, U-shaped, notch-shaped, etc. The most important thing is that the wire connecting plate and the main wire lead-out end 11 are respectively connected to the two ends of the connector 5. When the connector 5 breaks, it can ensure that the battery module is disconnected from the external circuit, thereby ensuring that the charging and discharging circuit of the bulging battery module can be completely cut off. In addition, the material of the connector 5 in the invention can be aluminum, copper, nickel, titanium, tin, lead, etc., or it can be a composite welding type of the above two materials.

[0032] Preferably, the circuit breaker control mechanism of the present invention further includes a positioning part, which includes a positioning block 1 disposed inside the module housing 9 and connected to the connecting part. The positioning part is mainly used to sense the expansion of the battery module, because the expansion of the battery module will drive the positioning part to move. Since the positioning part is connected to the connecting part, when the positioning part moves, it will pull the connecting part to move, thereby breaking the connecting part and disconnecting the charging and discharging circuit of the battery module. The positioning part mainly includes the positioning block 1, and the structure of the positioning block 1 can be divided into various types as needed. When no other structure is set, and only the positioning block 1 is used to break the connecting part, the strength of the connecting block must be greater than the strength of the connecting part. This ensures that when the positioning block 1 moves, it can drive the connecting part 5 to move, thereby breaking the connecting part 5.

[0033] Preferably, the positioning block 1 in this invention is connected to the connecting part through the bridging part 4. The bridging part 4 facilitates the connection between the positioning block 1 and the connecting part. The structure and material of the bridging part 4 can be configured as needed. Both ends of the bridging part 4 are fixedly connected to the positioning block 1 and the connecting part, which can be welding or other connection methods. The specific shape can be a high-strength columnar, sheet-like, or linear structure of metal, polymer, or composite material. When using relevant materials, the material is required to have high tensile strength to prevent the bridging part 4 from breaking during subsequent stretching operations, which would cause the battery module's charging and discharging circuit to fail.

[0034] Preferably, the circuit breaker control mechanism of the present invention further includes a drive mechanism disposed inside the module for controlling the connection between the conductive connecting plate 10 and the main conductor lead-out end 11. The drive mechanism includes an elastic component 3. The elastic component 3 is connected to the bridging part 4 through a positioning block 1. The elastic component 3 is in a stretched state after assembly. The drive mechanism can be used to pull the bridging part 4 to move, thereby breaking the connector 5 and cutting off the charging and discharging circuit of the battery module. In order to ensure that the above-mentioned drive mechanism can achieve the corresponding effect, the positioning block 1 in the present invention is made of a brittle material. The specific material can be referred to the above materials. The positioning block 1 is made of a brittle material to facilitate the breakage of the positioning block 1 and avoid the presence of the positioning block 1 affecting the stretching of the connector 5 by the drive mechanism.

[0035] In addition, the elastic component 3 mentioned above can be made of materials such as springs and rubber. The special requirement is that the elastic component 3 is in a stretched state during installation. That is, a certain pre-stretching force can be designed in advance for the elastic component 3 during installation. This can ensure that when the battery module bulges, the stretching force of the elastic component 3 can reach the cutting conditions of the positioning block 1 and the connector 5 in time.

[0036] Preferably, the battery module of this invention includes multiple individual batteries 7, with a partition 6 between adjacent individual batteries 7; the driving mechanism is disposed on the partition 6, and the positioning block 1 is disposed on the inner wall of the mold housing; the partition 6 facilitates the arrangement and installation of the driving mechanism, and since the partition 6 is located inside the module housing 9, it is generally fixed, thus ensuring the stability of the connection at the end of the driving mechanism; in addition, to ensure the sensitivity of battery module expansion detection, in this invention, the positioning block 1 is located in the middle of the mold housing, and the driving mechanism is disposed at the lower end of the partition 6; because the battery module structure expands, the deformation capacity of the middle of the battery module structure is greater than that of the ends of the battery module structure, that is, when the traditional battery module structure bulges, the bulge in the middle of the battery module structure is greater, so when the positioning block 1 is located in the middle of the module housing 9 and the driving mechanism is located at the lower end of the partition 6, when the battery module structure bulges, the tensile force of the elastic component 3 can quickly and timely reach the cutting condition of the positioning block 1; thus, the bulging of the battery module structure can be identified more accurately.

[0037] Preferably, the connection point between the positioning block 1 and the inner wall of the mold housing and the connection point between the driving mechanism and the partition 6 are staggered. This staggered distribution is also to ensure that the elastic component 3 has a certain tensile force, which facilitates the arrangement of the positioning block 1 and the elastic component 3. In addition, the staggered distribution can be varied; it can be staggered front and back or up and down.

[0038] Preferably, the positioning block 1 in this invention includes a base block 101 and an extension block 102. The base block 101 is connected to the extension block 102 via a bridging block 103. The thickness of the bridging block 103 is less than the thickness of the base block 101 and the extension block 102. The arrangement of the base block 101 and the extension block 102 facilitates the connection between the positioning block 1 and adjacent components. In addition, the arrangement of the bridging block 103, by controlling the thickness of the bridging block 103, facilitates the breakage of the positioning block 1 and facilitates the subsequent stretching of the connecting member 5 by the elastic member 3.

[0039] Preferably, in this invention, both the driving mechanism and the bridging portion 4 are connected to the extension block 102. This connection method ensures that even after the positioning block 1 breaks, the driving mechanism and the bridging portion 4 can still be connected through the extension block 102 in the positioning block 1. This guarantees the subsequent stretching of the bridging portion 4 by the elastic member 3, thereby ensuring the tensile fracture of the connecting member 5. In addition, in this invention, besides being connected to the positioning block 1, the elastic member 3 and the bridging portion 4 also have a high-strength connection, so that after the positioning block 1 is cut, the elastic member 3 can provide effective traction force to the bridging portion 4. At the same time, in this invention, the thickness of the base block 101 is less than the thickness of the extension block 102. This can better ensure the stability of the connection between the positioning block 1, the bridging portion 4, and the elastic member 3 to a certain extent. Because the extension block 102 is thicker, even if the base block 101 breaks, the extension block 102 may not break, thereby avoiding the breakage of the connection between the extension portion and the elastic member 3 due to the breakage of the extension block 102. In other words, by limiting the above dimensions, the stability of the connection between the elastic member 3 and the bridging portion 4 can be better guaranteed.

[0040] Preferably, a linkage part is provided between the elastic component 3 and the bridging part 4 in the present invention. The linkage part includes a linkage belt 8, one end of which is connected to the elastic component 3 and the other end is connected to the bridging part 4. The linkage belt 8 can ensure that the elastic component 3 can still provide effective traction force to the bridging part 4 after the extension block 102 breaks.

[0041] Preferably, the connection points of the bridging part 4 and the connector 5, the connection points of the drive mechanism and the partition 6, and the connection points of the connecting block and the module housing 9 are arranged in a triangular pattern. This distribution makes the overall stability of the circuit breaker control mechanism stronger and has a smaller swing amplitude during normal use, which helps to ensure the stability of the entire battery module structure.

[0042] Preferably, in this invention, the elastic component 3 is connected to the partition plate 6 via the base 2. The base 2 provides a foundation for the connection between the elastic component 3 and the partition plate 6, facilitating the connection. Furthermore, in this invention, the base 2 is connected to the partition plate 6 via a sliding part, which includes a T-shaped groove 23 on the partition plate 6 and a T-shaped slider 22 on the base 2. The T-shaped slider 22 on the base 2 is connected to the T-shaped groove 23 on the partition plate 6. Due to the structural characteristics of the T-shaped slider 22 and the T-shaped groove 23, the base 2 and the partition plate 6 can remain immovable in the lateral direction. With the addition of bolts, the position of the base 2 on the partition plate 6 can be changed as needed. Additionally, as a further optimization, in this invention, the elastic component 3 is connected to the base 2 via a connecting hook. The base 2 is provided with a hook hole 21. This connection method facilitates the connection between the elastic component 3 and the base 2, thus facilitating the connection between the elastic component 3 and the partition plate 6.

[0043] Preferably, the positioning block 1 and the module housing 9 are connected by a detachable connection method, such as bolts or clips. This connection method is relatively simple and facilitates the assembly of the positioning block 1, as the positioning block 1 is assembled on the side of the module housing 9. To facilitate the assembly of the positioning block 1, clips are generally used for connection in actual operation. Of course, other connection methods can be selected as needed. In addition, the bridging part 4 and the positioning block 1, as well as the positioning block 1 and the elastic component 3, can also be connected by hooks, which can be configured as needed.

[0044] Obviously, the specific implementation of this invention is not limited to the above-described methods. Any non-substantial improvements made using the inventive concept and technical solution of this invention are within the protection scope of this invention.

Claims

1. A battery module structure having a self-disconnection protection function, the battery module structure comprising a module case in which a battery module is provided; characterized by, The battery module upper end is provided with a conductive connecting plate; the conductive connecting plate end is connected with a total wire leading end; the conductive connecting plate is connected with the total wire leading end through a circuit breaking control mechanism; The circuit breaking control mechanism includes a connecting part of the conductive connecting plate and the total wire leading end; the connecting part includes a connecting piece for connecting the conductive connecting plate and the total wire leading end; The circuit breaking control mechanism further includes a positioning part, the positioning part includes a positioning block arranged in the module shell interior, the positioning block is connected with the connecting part; The positioning block is connected with the connecting part through a bridging part; The circuit breaking control mechanism further includes a driving mechanism arranged in the module shell interior for controlling the conductive connecting plate and the total wire leading end to communicate, the driving mechanism includes an elastic part; the elastic part is connected with the bridging part through the positioning block; the elastic part is in a stretched state after assembly; The driving mechanism is used for pulling the bridging part to move, and then the breaking of the connecting piece is realized, so that the cutting off of the battery module charging and discharging circuit is realized; The positioning block includes a base block and an extension block, the base block is connected with the extension block through a bridging block; the thickness of the bridging block is less than the thickness of the base block and the extension block; The connecting points of the bridging part and the connecting piece, the connecting points of the driving mechanism and the partition plate and the connecting points of the connecting block and the module shell are in triangular distribution.

2. The battery module structure having a self-disconnection protection function according to claim 1, characterized by, The positioning block is made of brittle material.

3. The battery module structure having a self-disconnection protection function according to claim 1, wherein The battery module includes a plurality of single batteries, and a partition plate is arranged between adjacent single batteries; the driving mechanism is arranged on the partition plate, the positioning block is arranged on the inner wall of the mold shell; the positioning block is located in the middle position of the mold shell, the driving mechanism is arranged at the lower end of the partition plate; the connecting points of the positioning block and the inner wall of the mold shell and the connecting points of the driving mechanism and the partition plate are distributed in dislocation.

4. The battery module structure having a self-disconnection protection function according to claim 1, wherein The driving mechanism and the bridging part are connected with the extension block; the thickness of the base block is less than the thickness of the extension block.

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