Protection plate assembly and battery

Abstract

The invention relates to a protection plate assembly and a battery, the protection plate assembly comprises a protection plate, the protection plate is provided with a plurality of connection areas, and the connection areas are provided with protection plate through holes; the connecting piece is arranged in the connecting area, the connecting piece comprises a riveting fixing part and an abutting part, the riveting fixing part covers the connecting area, a connecting piece through hole is formed in the riveting fixing part, the connecting piece through hole corresponds to the protective plate through hole in position, the abutting part protrudes out of the connecting area, and the connecting piece is arranged in the connecting area. The abutting part is bent towards the direction of the protection plate, and can penetrate through the protection plate to abut against the battery cell module; the fixing rivet sequentially penetrates through the protection plate through hole and the connecting piece through hole, and the connecting piece can be fixed to the protection plate in an abutting and pressing mode. According to the protection plate assembly provided by the invention, the connection form of the battery cell and the protection plate is changed, the overcurrent capability can be improved, and the service life can be prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of battery assembly, and in particular to a protection plate assembly and a battery. Background Art

[0002] Lithium batteries are mainly composed of two parts, the battery cell and the protection board (power batteries are generally called battery management systems BMS). Among them, the battery management system is a system that manages the battery, which usually has the function of measuring the battery voltage to prevent or avoid abnormal conditions such as over-discharge, over-charge, and over-temperature of the battery. In the existing battery assembly production process, the battery cells need to be connected by connectors to form a series or parallel connection relationship. At the same time, the battery and the protection board are also electrically connected through connectors.

[0003] In the prior art, the connector is mainly connected to the pole in the battery cell assembly by soldering. In order to achieve welding with the pole, only nickel connecting pieces can be used. For example: Publication No.: CN221057628U, Invention Name: A Chinese Utility Model Patent of a Nickel Strip, a Protective Plate Assembly, a Battery and Electrical Equipment discloses a soldering connection using a nickel strip as a connecting piece, wherein: the protective plate assembly includes a protective plate and a nickel strip, the protective plate is provided with a plurality of welding areas, the welding areas are provided with through holes, the limit blocks on the nickel strip cooperate with the through holes, and the nickel strip is welded to the welding areas by welding equipment.

[0004] However, in actual use, on the one hand, the cost of nickel strips is relatively high and the current carrying capacity of the same cross-section is relatively low. On the other hand, most of the current battery cells' poles are made of aluminum. When aluminum and nickel are welded, the connection strength of aluminum and nickel is low and the bonding is poor, which makes it easy for them to break at the welding point and affect the service life of the battery cells. Summary of the invention

[0005] To this end, the technical problem to be solved by the present invention is to overcome the problems of high cost, low current carrying capacity and reduced service life of the battery cell caused by the soldering connection method used in the prior art to connect the battery cell and the protection board, and to provide a protection board assembly. Changing the connection form between the battery cell and the protection board can further improve the connection performance and increase the service life of the battery cell. Moreover, while changing the connection form, the material of the connecting piece can be changed, which can not only reduce the cost of the connecting piece, but also improve the current carrying capacity under the same cross-sectional conditions.

[0006] In order to solve the above technical problems, the present invention provides a protection plate assembly, comprising:

[0007] A protection plate, wherein a plurality of connection areas are provided on the protection plate, and the connection areas are provided with protection plate through holes;

[0008] A connecting piece, arranged in the connecting area, comprising: a riveted fixing portion and an abutting portion, the riveted fixing portion covers the connecting area, a connecting piece through hole is opened on the riveted fixing portion, the connecting piece through hole is arranged corresponding to the position of the protective plate through hole, the abutting portion protrudes from the connecting area and is bent in the direction of the protective plate, and the abutting portion can pass through the protective plate to abut against the battery cell module;

[0009] A fixing rivet is passed through the through hole of the protection plate and the through hole of the connecting piece in sequence, and can press and fix the connecting piece on the protection plate.

[0010] In one embodiment of the present invention, it further comprises: an elastic member, which is sleeved on the fixing rivet, and the elastic member elastically supports the protection plate and the connecting sheet.

[0011] In one embodiment of the present invention, the connecting sheet has two connecting structures:

[0012] An edge connecting piece having a protruding abutting portion provided on one side of the riveting fixing portion;

[0013] The middle connecting piece is provided with protruding abutting portions on both sides of the riveted fixing portion.

[0014] In one embodiment of the present invention, the connecting sheet is a single-layer connecting sheet or a composite connecting sheet.

[0015] In one embodiment of the present invention, the composite connecting sheet comprises:

[0016] The segmented composite connecting piece, that is, the abutting portion and the riveted fixing portion are respectively made of different metal materials;

[0017] Or, a layered composite connecting sheet includes a base layer and a composite layer partially covering or fully covering the base layer of the aluminum sheet.

[0018] In order to solve the above technical problems, the present invention further provides a battery, comprising the above protection plate assembly, and further comprising:

[0019] A battery cell module is connected to the protection board assembly, the battery cell module includes a plurality of battery cell units, and the abutting portion of the connecting sheet abuts against the pole of the battery cell unit.

[0020] In one embodiment of the present invention, the battery cell module further includes:

[0021] A restraint member is disposed around the outer circumference of the battery cell module and is used to restrain the battery cell module.

[0022] In one embodiment of the present invention, the battery cell module further includes:

[0023] An insulating heat-spreading partition is provided between two adjacent battery cells and is used to separate the two battery cells.

[0024] In one embodiment of the present invention, the battery cell module further includes: an end plate, which is arranged at both ends of the battery cell module, and the end plate is an accordion-type hollow plate; one side of the end plate is in contact with the battery cell unit, and the other side of the end plate is provided with a limiting groove, and a restraining member can be set in the limiting groove.

[0025] In one embodiment of the present invention, the battery cell module further includes:

[0026] A bottom support box is used to carry and accommodate the battery cell module. A plurality of baffles are arranged in the bottom support box, and the plurality of baffles divide the bottom support box into a plurality of single battery cell accommodating slots.

[0027] The above technical solution of the present invention has the following advantages compared with the prior art:

[0028] The protection plate assembly of the present invention changes the soldering connection form between the battery cell and the protection plate, opens through holes at positions corresponding to the connecting piece and the protection plate, adopts fixing rivets to pass through the through holes on the connecting piece and the protection plate in sequence, and then performs mechanical riveting to achieve fixed connection between the connecting piece and the protection plate, and arranges the connecting piece to protrude from the bend of the protection plate. When the positions of the connecting piece and the protection plate are fixed, the connecting piece can always abut against the battery cell, thereby ensuring the stability of the connection between the connecting piece and the protection plate, avoiding the occurrence of welding cracks, and further improving the connection performance.

[0029] The protection plate assembly described in the present invention does not need to be welded between the battery cell and the protection plate, so there is no need to use nickel material as the connecting plate. The material of the connecting plate of the present invention can be changed accordingly according to the material of the terminal on the battery cell module. For example, when the terminal is made of aluminum, the connecting plate is also an aluminum-based connecting plate. Compared with the connecting plate made of nickel, the aluminum-based connecting plate not only has lower cost, but also can improve the current carrying capacity under the same cross-sectional conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein:

[0031] Figure 1 is a schematic diagram of the overall structure of the protection plate assembly of the present invention;

[0032] Figure 2 It is a schematic diagram of the exploded structure of the protection plate assembly of the present invention;

[0033] Figure 3 It is a side structural schematic diagram of the protective plate assembly of the present invention;

[0034] Figure 4 is a schematic structural diagram of an edge connecting piece of the present invention;

[0035] Figure 5 It is a schematic structural diagram of the middle connecting piece of the present invention;

[0036] Figure 6 It is a schematic diagram of the structure of the aluminum connecting piece of the present invention;

[0037] Figure 7 It is a schematic structural diagram of the segmented composite connecting sheet of the present invention;

[0038] Figure 8 It is a schematic diagram of a partially covered structure of a layered composite connecting sheet of the present invention;

[0039] Fig. 9 This is a schematic diagram of the structure of the fully covered layered composite connecting sheet of the present invention;

[0040] Fig.10 It is a schematic diagram of the overall structure of the battery of the present invention;

[0041] Fig.11 It is a schematic diagram of the explosion structure of the battery of the present invention;

[0042] Explanation of the reference numerals in the drawings in the specification: 1. Protective plate; 2. Connecting piece; 21. Riveted fixing portion; 22. Abutting portion; 23. Connecting piece through hole; 211. Aluminum connecting piece; 221. Aluminum sheet; 222. Copper sheet; 231. Aluminum sheet base layer; 232. Copper sheet layer; 3. Fixing rivet; 4. Elastomer; 5. Battery cell; 6. Insulating heat-dissipating baffle; 7. End plate; 8. Restraint; 9. Bottom support box. DETAILED DESCRIPTION

[0043] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0044] Example 1

[0045] Reference Figure 1 to Figure 3 As shown, the present invention discloses a protection plate assembly, which can be assembled with a battery module to form a lithium battery for use in electrical equipment. The protection plate assembly includes: a protection plate 1, a connecting sheet 2 and a fixing rivet 3, wherein:

[0046] The protection board 1 can carry a battery management system (BMS), which is an electronic device used to monitor and manage the battery charging and discharging process. It controls the working state of the battery by collecting data such as the voltage, current, and temperature of the battery to protect the battery and improve its performance and service life. In this embodiment, in order to realize the riveting assembly of the protection board 1, a plurality of connection areas are provided on the protection board 1, and protection board through holes are opened on the connection areas;

[0047] The connecting piece 2 is riveted and assembled with the protective plate 1 at the position of the connecting area, and the connecting piece 2 includes: a riveted fixing portion 21 and an abutting portion 22, wherein: the riveted fixing portion 21 covers the connecting area, and a connecting piece 2 through hole is opened on the riveted fixing portion 21, and the connecting piece 2 through hole is arranged corresponding to the position of the protective plate through hole, and the fixing rivet 3 passes through the protective plate through hole and the connecting piece 2 through hole in sequence, and the end of the fixing rivet 3 passes through the protective plate through hole and the connecting piece 2 through hole in sequence, and then expands to the periphery to fix the protective plate 1 and the connecting piece 2 by riveting, so that the connecting piece 2 can be pressed and fixed on the protective plate 1; the abutting portion 22 protrudes from the connecting area and is bent in the direction of the protective plate 1, and the abutting portion 22 after bending can pass through the protective plate 1 and abut against the battery module, and the connection of multiple battery cells between the battery modules is realized through the connecting piece 2;

[0048] The protection plate assembly of this embodiment changes the soldering connection form between the battery cell and the protection plate 1, opens through holes at positions corresponding to the connecting piece and the protection plate 1, uses fixing rivets 3 to pass through the through holes on the connecting piece and the protection plate 1 in sequence, and then performs mechanical riveting to achieve a fixed connection between the connecting piece and the protection plate 1, and sets the connecting piece to protrude from the protection plate 1 and bend. When the positions of the connecting piece and the protection plate 1 are fixed, the connecting piece can always abut against the battery cell, thereby ensuring the stability of the connection between the connecting piece and the protection plate 1, avoiding the occurrence of welding cracks, and further improving the connection performance;

[0049] Moreover, in the present embodiment, since there is no need to weld between the connecting pieces on the battery cell and the protection board assembly, there is no need to use nickel material as the connecting piece. The material of the connecting piece described in the present invention can be changed accordingly according to the material of the terminal on the battery cell module. For example, when the terminal is made of aluminum, the connecting piece is also an aluminum-based connecting piece. Compared with the connecting piece made of nickel, the aluminum-based connecting piece is not only lower in cost, but also can improve the current carrying capacity under the same cross-sectional conditions.

[0050] It should be noted that, in this embodiment, since there is no need to connect the connecting piece 2 and the battery cell by welding, a riveted connection method is used to provide convenience for the external BMS. When an abnormality occurs in a certain collection line of the BMS, one of the lines can be replaced separately. The riveted connection method is easier to disassemble, thereby providing convenience for production.

[0051] Specifically, in the present embodiment, the protection plate assembly further includes: an elastic member 4, wherein the elastic member 4 is sleeved on the fixing rivet 3, and the elastic member 4 can elastically support the protection plate 1 and the connecting piece 2, and the elastic member 4 enables the protection plate 1 and the connecting piece 2 to have an elastic connecting force, and when the protection plate 1 is actually assembled on the battery cell module, the elastic member 4 can provide a certain redundant space for the abutment between the connecting piece 2 and the battery cell module, and the elastic member 4 can eliminate the occurrence of virtual connection caused by materials and environment, and the elastic member 4 elastically supports the connecting piece 2 to ensure that the connecting piece 2 can be pressed on the battery cell module without causing extrusion damage to the battery cell module, thereby reducing the assembly accuracy of the connecting piece 2 and the battery cell module in actual production, and can provide the assembly yield rate of the connecting piece 2 and the battery cell module.

[0052] Specifically, the elastic member 4 can adopt various elastic support forms such as a columnar elastic body and a sheet elastic body, and the elastic member 4 can be selected according to elasticity requirements and installation space.

[0053] In actual use, the connecting piece 2 is provided with two structures to match two different connection situations:

[0054] Reference Figure 4 As shown, the connecting piece 2 is an edge connecting piece, and the connecting piece 2 includes a riveted fixing portion 21 and an abutting portion 22, the riveted fixing portion 21 and the abutting portion 22 are connected, and the abutting portion 22 is protrudingly arranged on a side of the riveted fixing portion 21, and the edge connecting piece can only realize the connection between one battery cell and the protection plate 1, and the edge connecting piece is suitable for when the battery cell in the battery cell module is the total positive or total negative electrode, after the two battery cells are connected, the battery cell located at the edge is connected to the protection plate 1;

[0055] Reference Figure 5 As shown, the connecting piece 2 is a middle connecting piece, and the connecting piece 2 includes a riveted fixing portion 21 and two abutting portions 22. The riveted fixing portion 21 is connected to the two abutting portions 22, and the abutting portions 22 are protrudingly arranged on the two side surfaces of the riveted fixing portion 21. The edge connecting piece can realize the connection between two battery cells and the connection between two battery cells and the protective plate 1.

[0056] In actual use, in order to change the flow capacity of the connecting piece 2, the present invention provides connecting pieces 2 in various forms, including: a single-layer connecting piece or a composite connecting piece.

[0057] Reference Figure 6As shown, in this embodiment, the connecting piece 2 is an aluminum connecting piece 211 of a single-piece structure, that is, it is formed by integrally forming an aluminum material. Compared with a nickel material, the aluminum material has a better flow rate under the same area;

[0058] In other embodiments, the terminal material on the battery module can be changed accordingly so that the material of the connecting piece and the terminal are the same to ensure the consistency of the overcurrent performance.

[0059] Reference Figure 7 As shown, in this embodiment, the connecting piece 2 is a segmented composite connecting piece, that is, it is formed by segmented splicing of different materials, wherein: the abutting portion 22 is made of an aluminum sheet 221, and the riveted fixing portion 21 is made of a copper sheet 222. The segmented composite connecting piece uses copper material as a composite material, which can further increase the current capacity of the connecting piece;

[0060] In other embodiments, according to actual use requirements, the riveting fixing portion 21 may also be made of other metals, such as nickel, gold, silver, etc.

[0061] Reference Figure 8 As shown, in this embodiment, the connecting sheet 2 is a layered composite connecting sheet, including an aluminum sheet base layer 231 and a copper sheet layer 232 partially covering the aluminum sheet base layer 231. The copper sheet layer 232 and the aluminum sheet base layer 231 form a composite layer structure. The composite layer structure is arranged on the riveting fixing part 21, which can further increase the flow capacity between the connecting sheet 2 and the protective plate 1. Fig. 9 As shown, in this embodiment, the connecting sheet 2 is a layered composite connecting sheet, including an aluminum sheet base layer 231, and a copper sheet layer 232 that completely covers the aluminum sheet base layer 231. The copper sheet layer 232 and the aluminum sheet base layer 231 form a composite layer structure. The composite layer structure is arranged on the riveted fixing portion 21 and the abutting portion 22, which can further increase the current flow capacity between the connecting sheet 2 and the protective plate 1, as well as the current flow capacity between the connecting sheet 2 and the battery cell module.

[0062] In other embodiments, different metal substrates can be selected according to the terminal material on the battery cell module to ensure that the material is the same as the terminal. According to actual usage requirements, nickel, gold, silver and other materials can also be set to partially or completely cover the base layer to form a composite layer structure.

[0063] In this embodiment, the flow capacity of the four types of connecting pieces 2 is detected and calibrated, and different connecting pieces 2 can be used according to the flow requirements in actual use.

[0064] Example 2

[0065] The protection board assembly of Example 1 is assembled on the battery module when it is actually used. The protection board assembly and the battery module together constitute a lithium battery and are used in electrical equipment. Therefore, based on the above Example 1, refer to Fig.10 and Fig.11 As shown, the present invention also discloses a battery, including the above-mentioned protection board assembly, and also includes: a battery cell module, the battery cell module is connected to the protection board assembly, the battery cell module includes a plurality of battery cell units 5, the abutment portion 22 of the connecting sheet 2 abuts against the pole of the battery cell unit 5, thereby realizing the electrical connection between the battery cell module and the protection board assembly.

[0066] Specifically, in actual use, in order to further extend the service life of the battery cell module, in the present embodiment, the assembly structure of the battery cell module is also improved. The battery cell module in the prior art does not take into account the full clamping design of the battery cell, and the battery cell module expands and squeezes during long-term cyclic use, resulting in a reduced cycle life. At the same time, the existing battery cell module also has a lower cycle life due to the pack design, resulting in after-sales problems, etc. Therefore, in the present embodiment, the assembly structure of the battery cell module is improved from the full clamping angle and pack angle of the battery cell module.

[0067] From the perspective of comprehensive clamping design, the battery cell module described in this embodiment also includes:

[0068] The insulating heat-distributing baffle 6 is arranged between two adjacent battery cells 5. The insulating heat-distributing baffle 6 is used to separate the two battery cells 5. On the one hand, the insulating heat-distributing baffle 6 can play the role of insulation and heat insulation, and can avoid the problems of short circuit and temperature superposition when the battery cells 5 are used. On the other hand, the insulating heat-distributing baffle 6 can also play a supporting role, which can eliminate the gaps between the battery cells 5 and prevent the battery cells 5 from expanding.

[0069] End plates 7, which are arranged at both ends of the battery module, and can limit, clamp and fix multiple battery cells 5, provide a certain support force for the battery cells 5, and prevent the battery cells 5 from expanding;

[0070] Specifically, the end plate 7 is an accordion-type hollow plate, which can reduce its own weight while ensuring strong supporting force, thereby reducing the weight of the entire battery module.

[0071] Specifically, one side of the end plate 7 is in contact with the battery cell 5 , and the other side of the end plate 7 is provided with a limiting groove, in which a restraining member can be disposed.

[0072] From the perspective of pack design, the battery cell module described in this embodiment also includes:

[0073] The restraint member 8 is arranged around the periphery of the battery cell module and is used to restrain the battery cell module. In the present embodiment, the restraint member 8 is respectively arranged at the top and bottom of the battery cell module, which can limit the expansion of the battery cell 5 to a certain extent.

[0074] The bottom support box 9 is used to carry and accommodate the battery module. A plurality of baffles are provided in the bottom support box 9. The plurality of baffles divide the bottom support box 9 into a plurality of single battery cell accommodating grooves. Each of the battery cells 5 is independently inserted into the single battery cell accommodating groove. The single battery cell accommodating grooves not only separate the battery cells 5, but also fix the positions of the battery cells 5.

[0075] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0076] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0077] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0078] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A protective plate assembly, characterized in that: include: A protection plate, wherein a plurality of connection areas are provided on the protection plate, and the connection areas are provided with protection plate through holes; A connecting piece, arranged in the connecting area, comprising: a riveted fixing portion and an abutting portion, the riveted fixing portion covers the connecting area, a connecting piece through hole is opened on the riveted fixing portion, the connecting piece through hole is arranged corresponding to the position of the protective plate through hole, the abutting portion protrudes from the connecting area and is bent in the direction of the protective plate, and the abutting portion can pass through the protective plate to abut against the battery cell module; A fixing rivet is passed through the through hole of the protection plate and the through hole of the connecting piece in sequence, and can press and fix the connecting piece on the protection plate.

2. The protection plate assembly according to claim 1, characterized in that: Also includes: An elastic member is sleeved on the fixing rivet, and the elastic member elastically supports the protection plate and the connecting piece.

3. The protection plate assembly according to claim 1, characterized in that: The connecting piece has two connecting structures: An edge connecting piece having a protruding abutting portion provided on one side of the riveting fixing portion; The middle connecting piece is provided with protruding abutting portions on both sides of the riveted fixing portion.

4. The protection plate assembly according to claim 1, characterized in that: The connecting sheet is a single-layer connecting sheet or a composite connecting sheet.

5. The protection plate assembly according to claim 4, characterized in that: The composite connecting sheet comprises: The segmented composite connecting piece, that is, the abutting portion and the riveted fixing portion are respectively made of different metal materials; Or, a layered composite connecting sheet comprises a base layer and a composite layer partially or fully covering the base layer.

6. A battery, characterized in that: The protective plate assembly according to any one of claims 1 to 4 above further comprises: A battery cell module is connected to the protection board assembly, the battery cell module includes a plurality of battery cell units, and the abutting portion of the connecting sheet abuts against the pole of the battery cell unit.

7. The battery according to claim 6, characterized in that: The battery module also includes: A restraint member is disposed around the outer circumference of the battery cell module and is used to restrain the battery cell module.

8. The battery according to claim 6, characterized in that: The battery module also includes: An insulating heat-spreading partition is provided between two adjacent battery cells and is used to separate the two battery cells.

9. The battery according to claim 6, characterized in that: The battery cell module also includes: an end plate, which is arranged at both ends of the battery cell module, and is an accordion-style hollow plate; one side of the end plate is in contact with the battery cell unit, and the other side of the end plate is provided with a limiting groove, and a restraining member can be set in the limiting groove.

10. The battery according to claim 6, characterized in that: The battery module also includes: A bottom support box is used to carry and accommodate the battery cell module. A plurality of baffles are arranged in the bottom support box, and the plurality of baffles divide the bottom support box into a plurality of single battery cell accommodating slots.

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