Module collection assembly and power battery module

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By setting the drain window and confluence of the heat insulation parts in the module acquisition assembly, the problem of the insulation parts blocking electrolyte sputtering is solved, preventing the spread of heat out of control, and achieving the voltage and temperature of the battery cell collection.

CN222365703UActive Publication Date: 2025-01-17WEICHAI POWER CO LTD +2

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Patent Information

Application Number: CN202420808748.3
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-04-18
Publication Date: 2025-01-17
Estimated Expiration: 2034-04-18

AI Technical Summary

Technical Problem

When the existing module acquisition assembly prevents thermal runaway, the thermal insulation parts will block the sputtering of the electrolyte, causing heat to spread and causing more serious thermal runaway problems.

Method used

A module acquisition assembly is designed, including heat insulation parts, bushing parts and voltage temperature acquisition module. The heat insulation parts are equipped with a liquid discharge window on the top of the battery cell to discharge high-temperature electrolyte. The bushing parts are electrically connected to the battery cell side, and the voltage is The temperature acquisition module is used to collect the voltage and temperature of the battery cell on the side of the insulation member facing away from the battery cell assembly.

Benefits of technology

Effectively prevent high-temperature electrolyte from sputtering to other batteries, avoid thermal runaway spread, and at the same time realize the collection of battery voltage and temperature.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model belongs to the technical field of power battery modules, and discloses a module acquisition assembly and a power battery module. The module collection assembly comprises a heat insulation piece, a convergence piece and a voltage and temperature collection module. The heat insulation piece is arranged at the top of the battery cell assembly, and a liquid drainage window is formed in the position, right opposite to the anti-explosion valve at the top of each battery cell in the battery cell assembly, of the heat insulation piece. And the bus piece is arranged on one side, deviating from the battery core assembly, of the heat insulation piece and is electrically connected to the battery core assembly. And the voltage and temperature acquisition module is arranged on one side, deviating from the battery core assembly, of the heat insulation piece and is electrically connected to the bus piece. The module collection assembly can timely discharge the electrolyte exploded and sprayed by the battery cell with thermal runaway, and prevents the high-temperature electrolyte from being sputtered to other normal battery cells in the power battery module to cause heat spreading.

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Description

Technical Field

[0001] The utility model relates to the technical field of power battery modules, and in particular to a module collection assembly and a power battery module. Background Art

[0002] The power battery system is a widely used energy storage system with high energy density. It consists of a large number of battery cells connected in series and parallel, and multiple battery cells are closely arranged and connected to meet high energy requirements. A module collection assembly is set on the top of multiple battery cells, which can collect physical properties such as voltage and temperature of the battery cells.

[0003] When thermal runaway occurs in the power battery system, the energy inside the battery cell will be released in an instant, causing electrolyte to burst out at the explosion-proof valve on the top of the battery cell, causing the temperature to rise rapidly and causing thermal runaway.

[0004] In order to prevent the electrolyte from bursting out from the top of the battery cell in thermal runaway, the prior art has made the following design: the existing module collection assembly includes a bus and a heat-insulating part, the bus is welded as a whole on the top of multiple battery cells, and the heat-insulating part is fixed to the top of the bus by rivet connection. However, the above scheme has the following problems: the heat-insulating part will cause obstruction at the explosion-proof valve of the battery cell. When the electrolyte bursts out from a battery cell, the electrolyte will splash onto other battery cells under the obstruction of the heat-insulating part, causing heat to spread and triggering a more serious thermal runaway problem.

[0005] Therefore, there is an urgent need for a module acquisition assembly and a power battery module to solve the above problems. Utility Model Content

[0006] According to one aspect of the utility model, the purpose is to provide a module collection assembly, which can promptly discharge the electrolyte sprayed from the battery cell that has thermal runaway, and prevent the high-temperature electrolyte from splashing onto other normal battery cells in the power battery module and causing heat spread.

[0007] To achieve this purpose, the utility model adopts the following technical solutions:

[0008] Module collection assembly, including:

[0009] A heat insulating member, the heat insulating member is arranged on the top of the battery core assembly, and the heat insulating member is provided with a drainage window at a position directly opposite to the explosion-proof valve on the top of each battery core in the battery core assembly;

[0010] A current collector, the current collector is arranged on a side of the heat insulating member away from the battery cell assembly and is electrically connected to the battery cell assembly;

[0011] A voltage and temperature acquisition module is arranged on a side of the thermal insulation component away from the battery core assembly and is electrically connected to the busbar.

[0012] As a preferred solution of the module collection assembly provided by the utility model, the shape of the liquid discharge window matches the shape of the liquid outlet of the explosion-proof valve.

[0013] As a preferred solution of the module collection assembly provided by the utility model, the thermal insulation component is provided with a plurality of through openings, and the current collector can be connected to a plurality of battery cells through the plurality of through openings.

[0014] As a preferred solution of the module collection assembly provided by the utility model, a limiting groove is provided on a side of the thermal insulation component away from the battery cell assembly, and the current collector can be embedded in the limiting groove.

[0015] As a preferred solution of the module acquisition assembly provided by the utility model, a mounting groove is provided on a side of the thermal insulation component away from the battery cell assembly, and the voltage and temperature acquisition module is arranged in the mounting groove.

[0016] As a preferred solution of the module acquisition assembly provided by the utility model, the voltage and temperature acquisition module includes an electrically connected flexible acquisition line, a temperature sensor and a voltage sensor, the temperature sensor and the voltage sensor are arranged on the flexible acquisition line, and the flexible acquisition line is connected to the busbar.

[0017] As a preferred solution of the module collection assembly provided by the utility model, the voltage and temperature collection module also includes an electrical connection piece, which is arranged on a side of the thermal insulation component away from the battery cell assembly and is connected to the flexible collection line and the busbar.

[0018] As a preferred solution of the module collection assembly provided by the utility model, the busbar includes a positive busbar and a negative busbar, the positive electrode of the battery cell is connected to the positive busbar, and the negative electrode of the battery cell is connected to the negative busbar.

[0019] As a preferred solution of the module collection assembly provided by the utility model, the thermal insulation member is a mica thermal insulation board.

[0020] According to another aspect of the utility model, the purpose is to provide a power battery module, which includes a battery cell assembly and a module collection assembly as described in any one of the above schemes, the battery cell assembly includes a plurality of the battery cells, each of the battery cells is provided with the explosion-proof valve, the thermal insulation member is connected to the top of the plurality of the battery cells, the drainage window is opposite to the explosion-proof valve, and the busbar is electrically connected to the battery cells.

[0021] Beneficial effects of the utility model:

[0022] The module collection assembly provided by the utility model includes a heat insulation member, a current collector and a voltage and temperature collection module. The heat insulation member is arranged on the top of the battery cell assembly, and the heat insulation member is provided with a drainage window at the position of the explosion-proof valve on the top of each battery cell in the battery cell assembly. When the battery cell has thermal runaway and the high-temperature electrolyte sprays out from the explosion-proof valve, it can be discharged through the drainage window to the side of the heat insulation member away from the battery cell assembly to prevent the high-temperature electrolyte from splashing onto other normal batteries. The heat insulation member can separate the high-temperature electrolyte from the battery cell assembly to prevent the problem of thermal runaway from spreading. The current collector is arranged on the side of the heat insulation member away from the battery cell assembly and is electrically connected to the battery cell assembly; the voltage and temperature collection module is arranged on the side of the heat insulation member away from the battery cell assembly and is electrically connected to the current collector. The current collector can serve as a current carrier of the battery cell assembly, and the voltage and temperature of the battery cell assembly can be collected through the voltage and temperature collection module.

[0023] The power battery module provided by the utility model can realize the collection of voltage and temperature by setting the module collection assembly, and can effectively avoid the problem of thermal runaway. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a partial structural schematic diagram of a power battery module provided by an embodiment of the utility model;

[0025] Figure 2 It is a structural schematic diagram of the module collection assembly provided by an embodiment of the utility model;

[0026] Figure 3 It is a schematic diagram of the thermal insulation provided by the embodiment of the utility model.

[0027] In the figure:

[0028] 10. Battery cell assembly; 11. Battery cell;

[0029] 100, heat insulation; 110, drainage window; 120, through port; 130, limiting groove; 140, mounting groove;

[0030] 200, busbar; 210, positive busbar; 220, negative busbar;

[0031] 300, voltage and temperature acquisition module; 310, flexible acquisition line; 320, electrical connection piece. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0033] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] In the description of this embodiment, the terms "upper", "lower", "right", "left" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0036] Figure 1 A partial structural schematic diagram of a power battery module provided by an embodiment of the utility model is shown; Figure 1 , this embodiment provides a module collection assembly and a power battery module. The power battery module includes a battery cell assembly 10 and the module collection assembly provided in this embodiment. The battery cell assembly 10 includes a plurality of electrically connected battery cells 11, and an explosion-proof valve is provided on the top of each battery cell 11. When any battery cell 11 has thermal runaway, the high-temperature electrolyte can be sprayed out of the battery cell 11 through the corresponding explosion-proof valve to prevent the battery cell 11 from exploding. The module collection assembly is fixedly arranged on the top of the plurality of battery cells 11 to collect the voltage and temperature of the battery cell assembly 10.

[0037] Figure 2 A schematic diagram showing the structure of the module collection assembly provided by an embodiment of the utility model is shown; Figure 3 The schematic diagram of the heat insulation member provided by the embodiment of the utility model is shown. Figure 1-Figure 3The module collection assembly includes a heat insulating member 100, a current collector 200, and a voltage and temperature collection module 300. The heat insulating member 100 is a plate-shaped structure and is arranged on the top of the battery cell assembly 10. The current collector 200 is arranged on the side of the heat insulating member 100 away from the battery cell assembly 10, and is electrically connected to the battery cell assembly 10. The voltage and temperature collection module 300 is arranged on the side of the heat insulating member 100 away from the battery cell assembly 10, and is electrically connected to the current collector 200. The current collector 200 can serve as a current carrier of the battery cell assembly 10, and the voltage and temperature of the battery cell assembly 10 can be collected through the voltage and temperature collection module 300.

[0038] Optionally, in this embodiment, the thermal insulation member 100 is specifically a mica thermal insulation board. In this embodiment, the mica thermal insulation board is made of a modified mica board, which effectively improves the brittleness of mica, improves the overall rigidity of the mica thermal insulation board, and can withstand temperatures above 1200°C. In other embodiments, the thermal insulation member 100 can also be made of other materials that are easy to process and have thermal insulation and flame retardant effects.

[0039] Specifically, the heat insulating member 100 is provided with a drain window 110 at the position of the explosion-proof valve on the top of each battery cell 11 in the battery cell assembly 10. When a battery cell 11 has thermal runaway and high-temperature electrolyte is ejected from the explosion-proof valve, it can be discharged through the corresponding drain window 110 to the side of the heat insulating member 100 away from the battery cell assembly 10, preventing the high-temperature electrolyte from splashing onto other normal battery cells 11. The heat insulating member 100 can separate the high-temperature electrolyte from the battery cell assembly 10, preventing the problem of thermal runaway from spreading.

[0040] Preferably, the shape of the drain window 110 can be waist-shaped, circular or rectangular, etc., and its shape is based on matching the shape of the liquid outlet of the explosion-proof valve, and can accurately face the liquid outlet of the explosion-proof valve, so that the high-temperature electrolyte sprayed from the liquid outlet of the explosion-proof valve can be discharged through the drain window 110 to the side of the thermal insulation component 100 away from the battery cell assembly 10.

[0041] Continue to refer to Figure 2 The busbar 200 includes a positive busbar 210 and a negative busbar 220. The positive busbar 210 and the negative busbar 220 are arranged at intervals along the width direction of the heat insulation member 100. The positive electrodes of the plurality of battery cells 11 are respectively connected to the positive busbar 210, and the negative electrodes of the plurality of battery cells 11 are respectively connected to the negative busbar 220.

[0042] Specifically, refer to Figure 3, the heat insulating member 100 is provided with a plurality of openings 120, and the busbar 200 can be electrically connected to the plurality of battery cells 11 through the plurality of openings 120. That is, a plurality of openings 120 are respectively provided at positions corresponding to the positive busbar 210 and the negative busbar 220 in the width direction of the heat insulating member 100, and the plurality of openings 120 corresponding to the positive busbar 210 correspond to the positive electrodes of the plurality of battery cells 11 one by one, and the plurality of openings 120 corresponding to the negative busbar 220 correspond to the negative electrodes of the plurality of battery cells 11 one by one. The positive busbar 210 is connected to the positive electrode of the battery cell 11 by laser welding at the position corresponding to the corresponding opening 120, and the negative busbar 220 is connected to the negative electrode of the battery cell 11 by laser welding at the position corresponding to the corresponding opening 120.

[0043] Specifically, the heat insulating member 100 has a limiting groove 130 on one side facing away from the battery cell assembly 10, and the current collector 200 can be embedded in the limiting groove 130. Figure 2 and Figure 3 The limiting grooves 130 can be specifically set to be multiple according to the actual structure and quantity of the positive busbar 210 and the negative busbar 220, so as to stably embed the positive busbar 210 and the negative busbar 220.

[0044] Continue to refer to Figure 1 and Figure 2 The voltage and temperature acquisition module 300 includes an electrically connected flexible acquisition line 310, a temperature sensor (not shown) and a voltage sensor (not shown). The temperature sensor and the voltage sensor are arranged on the flexible acquisition line 310, and the flexible acquisition line 310 is electrically connected to the busbar 200.

[0045] Specifically, the voltage and temperature acquisition module 300 further includes a plurality of electrical connection sheets 320. The electrical connection sheets 320 are fixedly arranged on the side of the thermal insulation member 100 away from the battery cell assembly 10 through a fixing structure such as a buckle, and the positive bus bar 210 and the flexible collection line 310 are connected through a part of the electrical connection sheets 320, and the negative bus bar 220 and the flexible collection line 310 are connected through another part of the electrical connection sheets 320. In this embodiment, the electrical connection sheets 320 are specifically nickel sheets.

[0046] Specifically, the side of the heat insulating member 100 away from the battery cell assembly 10 is provided with a mounting groove 140. The mounting groove 140 is specifically arranged between the positive bus bar 210 and the negative bus bar 220, and the voltage and temperature acquisition module 300 is arranged in the mounting groove 140. Through the above arrangement, the height of the voltage and temperature acquisition module 300 is lower than the height of the end face of the heat insulating member 100 away from the battery cell assembly 10, which effectively prevents the upper cover of the power battery module from pressing the voltage and temperature acquisition module 300.

[0047] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. The module collection assembly is characterized by: include: A heat insulating member (100), the heat insulating member (100) being arranged on the top of the battery cell assembly (10), and the heat insulating member (100) being provided with a drainage window (110) at a position directly opposite to the explosion-proof valve on the top of each battery cell (11) in the battery cell assembly (10); A current collector (200), the current collector (200) being arranged on a side of the heat insulating member (100) facing away from the battery cell assembly (10) and being electrically connected to the battery cell assembly (10); A voltage and temperature acquisition module (300) is arranged on a side of the heat insulating member (100) away from the battery cell assembly (10) and is electrically connected to the busbar (200).

2. The module collection assembly according to claim 1, characterized in that: The shape of the liquid discharge window (110) matches the shape of the liquid outlet of the explosion-proof valve.

3. The module collection assembly according to claim 1, characterized in that: The heat insulating member (100) is provided with a plurality of through openings (120), and the current collector (200) can be connected to a plurality of the battery cells (11) through the plurality of through openings (120).

4. The module collection assembly according to claim 1, characterized in that: A limiting groove (130) is provided on a side of the heat insulating member (100) facing away from the battery core assembly (10), and the current collector (200) can be embedded in the limiting groove (130).

5. The module collection assembly according to claim 1, characterized in that: A mounting groove (140) is provided on a side of the heat insulating member (100) facing away from the battery cell assembly (10), and the voltage and temperature acquisition module (300) is arranged in the mounting groove (140).

6. The module collection assembly according to claim 1, characterized in that: The voltage and temperature acquisition module (300) comprises an electrically connected flexible acquisition line (310), a temperature sensor and a voltage sensor, wherein the temperature sensor and the voltage sensor are arranged on the flexible acquisition line (310), and the flexible acquisition line (310) is connected to the busbar (200).

7. The module collection assembly according to claim 6, characterized in that: The voltage and temperature acquisition module (300) further comprises an electrical connection sheet (320), which is arranged on a side of the thermal insulation component (100) away from the battery cell assembly (10) and is connected to the flexible acquisition line (310) and the busbar (200).

8. The module collection assembly according to claim 1, characterized in that: The busbar (200) comprises a positive busbar (210) and a negative busbar (220); the positive electrode of the battery cell (11) is connected to the positive busbar (210), and the negative electrode of the battery cell (11) is connected to the negative busbar (220).

9. The module collection assembly according to any one of claims 1 to 8, characterized in that: The thermal insulation member (100) is a mica thermal insulation board.

10. A power battery module, characterized in that: It comprises a battery cell assembly (10) and the module collection assembly as claimed in any one of claims 1 to 9, wherein the battery cell assembly (10) comprises a plurality of battery cells (11), each of the battery cells (11) is provided with the explosion-proof valve, the heat insulating member (100) is connected to the top of the plurality of battery cells (11), the drainage window (110) is directly opposite to the explosion-proof valve, and the busbar (200) is electrically connected to the battery cells (11).