Battery pack filling module, battery pack and electric equipment

Abstract

The utility model discloses a battery pack filling module, a battery pack and electric equipment. The battery pack filling module comprises a first core column, and the first core column is made of an inorganic material and is in a prism shape. The battery pack filling module is made of an inorganic material, has the advantages of low density, high compressive strength, good insulation and pressure resistance, low cost and the like, can keep a complete structure at a high temperature during thermal runaway, ensures the structural strength, keeps the shape of a single battery unchanged during thermal runaway, and is convenient to use. And the safety levels of the battery pack and the new energy automobile are greatly improved.

Description

Technical Field

[0001] The utility model generally relates to the technical field of batteries, and more specifically to a battery pack filling module, a battery pack and an electrical device. Background Art

[0002] In the prior art, battery packs usually use plastic brackets inside the pack to achieve the purpose of filling gaps, exhausting and fixing wiring harnesses. When the battery pack is in thermal runaway, the plastic bracket will melt and fail due to high temperature. The battery will lose its restraint to a certain extent and expand rapidly, and the space inside the pack will shrink, resulting in the inability of high-temperature gas to be discharged smoothly through the originally designed exhaust channel, or even directly blocking the exhaust channel. The gas is discharged from the cold plate or upper cover, causing the pack seal to fail. In addition, the expansion and deformation of the battery will lead to the inability to open the valve (explosion-proof valve), the shell will rupture and the insulation will fail, the metal such as the connecting piece between the batteries will be pulled and dislocated, and the high-temperature gas in thermal runaway will produce sparks, which can easily cause arcing.

[0003] Therefore, when the battery pack is in thermal runaway, the failure of the plastic bracket may cause the pack to rupture or even accelerate the spread of heat, causing a more serious chain reaction. The prior art also has a solution of adding high-temperature resistant insulating protective mica and other materials on the outside of the plastic bracket. Although it can prevent the plastic bracket from melting at high temperature, the manufacturing cost is high and the manufacturing process is relatively complicated.

[0004] Therefore, it is necessary to provide a battery pack filling module, a battery pack and an electrical device to at least partially solve the above problems. Utility Model Content

[0005] A series of simplified concepts are introduced in the utility model content section, which will be further described in detail in the detailed implementation section. The utility model content section of the utility model does not mean to attempt to define the key features and essential technical features of the technical solution claimed for protection, nor does it mean to attempt to determine the scope of protection of the technical solution claimed for protection.

[0006] In order to solve the problem that a plastic bracket may fail due to high temperature melting when a battery pack is under thermal runaway, the first aspect of the utility model provides a battery pack filling module, comprising:

[0007] The first core column is made of inorganic material and is in a prism shape.

[0008] Optionally, the battery pack filling module further includes:

[0009] A protective layer is disposed on the outer surface of the first core column.

[0010] Optionally, the battery pack filling module further includes:

[0011] A groove is arranged on a side surface of the first core column, extends along the length direction of the first core column, and is used to form an airflow channel and / or a wiring harness channel.

[0012] Optionally, the battery pack filling module further includes:

[0013] The second core column is arranged inside the first core column, and the second core column is made of lightweight material.

[0014] Optionally, the lightweight material is foam.

[0015] Optionally, the inorganic material is a silicate material.

[0016] Optionally, the inorganic material is a cement-based material.

[0017] Optionally, the protective layer is a coating layer or an encapsulation layer.

[0018] A second aspect of the present invention provides a battery pack, comprising a battery cell and a battery pack filling module according to any one of the above technical solutions.

[0019] Optionally, the battery pack further includes:

[0020] An outer frame, wherein the outer frame is provided with a battery compartment;

[0021] The battery cell is arranged in the battery compartment;

[0022] The battery pack filling module is arranged in the battery compartment.

[0023] Optionally, the battery pack filling module is arranged in the space between the side surface and / or end surface of the battery cell and the outer frame.

[0024] Optionally, the battery pack filling module is arranged in the space between any adjacent battery cells.

[0025] Optionally, the groove of the battery pack filling module faces the outer frame or the bottom of the battery pack to form an air flow channel and / or a wiring harness channel.

[0026] Optionally, the groove of the battery pack filling module faces the end of the battery cell, forming an air flow channel and / or a wiring harness channel.

[0027] A third aspect of the present invention provides an electrical device, comprising a battery pack according to any one of the above technical solutions.

[0028] According to the battery pack filling module, battery pack and electrical equipment of the utility model, the battery pack filling module is made of inorganic materials, and has the advantages of low density, high compressive strength, good insulation pressure resistance, low cost, etc., and can maintain structural integrity at high temperature during thermal runaway to ensure structural strength. The shape of the battery cell remains unchanged during thermal runaway, the outer insulating film of the battery cell will not break, the circuit structure remains normal, the exhaust channel remains flowing, and the explosion-proof valve of the package can also open normally, which greatly improves the safety level of the battery pack and new energy vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The following drawings of the embodiments of the present invention are used as part of the present invention for understanding the present invention. The drawings show the embodiments of the present invention and their descriptions, and are used to explain the principles of the present invention. In the drawings,

[0030] Figure 1 A top view of a battery pack in the prior art;

[0031] Figure 2 A top view of a battery pack in the prior art;

[0032] Figure 3 A top view of a battery pack in the prior art;

[0033] Figure 4 is a three-dimensional diagram of a battery pack according to a preferred embodiment of the present utility model;

[0034] Figure 5 A three-dimensional diagram of a battery cell according to a preferred embodiment of the present invention;

[0035] Figure 6 A partial three-dimensional diagram of a battery pack according to a preferred embodiment of the present utility model;

[0036] Figure 7 is a cross-sectional view of a battery pack filling module according to a preferred embodiment of the present utility model;

[0037] Figure 8 It is a cross-sectional view of a battery pack filling module according to a preferred embodiment of the present utility model.

[0038] Description of reference numerals:

[0039] 1: Outer frame 2: Battery cell

[0040] 21: Shell 22: Insulation film

[0041] 23: Connecting piece 24: Glue injection hole

[0042] 3: Battery pack filling module 4: Battery pack filling module

[0043] 5: Battery pack filling module 6: Battery

[0044] 7: Battery pack filling module 8: Battery pack filling module

[0045] 9: Battery pack filling module 10: Battery pack filling module

[0046] 11: Battery pack filling module 12: Battery pack filling module

[0047] 13: Airflow channel / wiring channel 14: Battery pack filling module

[0048] 141: first core column 142: protective layer

[0049] 143: groove 144: second core column DETAILED DESCRIPTION

[0050] In the following description, a large number of specific details are given to provide a more thorough understanding of the utility model. However, it is obvious to those skilled in the art that the utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the utility model, some technical features known in the art are not described.

[0051] In order to thoroughly understand the utility model, a detailed description will be provided in the following description. It should be understood that these embodiments are provided to make the disclosure of the utility model thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. Obviously, the implementation of the embodiments of the utility model is not limited to the specific details familiar to those skilled in the art. The preferred embodiments of the utility model are described in detail below, but in addition to these detailed descriptions, the utility model may also have other embodiments.

[0052] Ordinal numbers such as "first" and "second" cited in the present invention are merely identifiers and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term "first component" itself does not imply the existence of the "second component", and the term "second component" itself does not imply the existence of the "first component".

[0053] It should be noted that the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside" and similar expressions used in the present invention are for illustrative purposes only and are not restrictive.

[0054] In some embodiments, the structure of the battery pack is as follows Figure 1 , Figure 2 , Figure 3As shown, it includes an outer frame 1 and a battery cell 2. The outer frame 1 is provided with a battery compartment, and a plurality of battery cells 2 are arranged in the battery compartment. Figure 1 Battery pack filling modules 3 and 5 are respectively arranged between the side surfaces of the battery cell 2 combination and the outer frame 1, and a battery pack filling module 4 is arranged between the end surface of the battery cell 2 combination and the outer frame 1. Figure 2 Battery pack filling modules 7, 8, 9, 10 are respectively arranged between the side of the middle battery 6 assembly and the outer frame 1. Figure 3 A battery pack filling module 11 is arranged between one corner of the middle battery cell 2 combination and the outer frame 1. These battery pack filling modules are all plastic brackets. Common materials for plastic brackets are PPO, ABS and MPP, etc. Plastic brackets will melt and fail at high temperature when the battery pack has thermal runaway.

[0055] The utility model discloses a battery pack filling module, a battery pack and electrical equipment.

[0056] Now, exemplary embodiments according to the present invention will be described in more detail with reference to the accompanying drawings.

[0057] like Figure 4 , Figure 5 , Figure 6 As shown, in a preferred embodiment, the battery pack includes an outer frame 1 and a battery cell 2. The outer frame 1 is provided with a battery compartment, and a plurality of battery cells 2 are arranged in the battery compartment. Figure 4 A battery pack filling module 12 and a battery pack filling module 14 are respectively arranged between the side of the middle battery cell 2 combination and the outer frame 1. The battery pack filling module 12 and the battery pack filling module 14 have the same structure, and the battery pack filling module 14 is taken as an example for description below.

[0058] like Figure 7 , Figure 8 As shown, the battery pack filling module 14 includes: a first core column 141, which is made of inorganic material and is prism-shaped. The prism-shaped design facilitates the abutment with the side of the battery cell 2 and the outer frame 1, and can be designed as a quadrangular prism or hexagonal prism structure.

[0059] The filling module in this embodiment is made of inorganic materials, which has the advantages of low density, high compressive strength, good insulation pressure resistance, low cost, etc. It can maintain structural integrity at high temperature during thermal runaway to ensure structural strength. The battery shape remains unchanged during thermal runaway, the battery outer insulation film will not break, the circuit structure remains normal, the exhaust channel remains unobstructed, and the explosion-proof valve of the package can also open normally, which greatly improves the safety level of the battery pack and new energy vehicles.

[0060] The filling module in this embodiment uses inorganic lightweight materials instead of plastic parts. The inorganic lightweight materials can maintain structural integrity at high temperatures to ensure that the battery cells do not undergo serious expansion and deformation. The molding method is convenient for processing special-shaped structural parts and convenient for modifying structural schemes without changing the mold, which can shorten the scheme change cycle.

[0061] Figure 1 , Figure 2 , Figure 3 In the battery pack shown, the battery pack filling modules can all be replaced with the battery pack filling modules made of inorganic materials in this embodiment, and the setting positions can remain unchanged.

[0062] like Figure 7 , Figure 8 As shown, in one embodiment, the battery pack filling module 14 also includes: a protective layer 142, which is arranged on the outer surface of the first core column 141. The protective layer 142 can prevent the first core column 141 from dropping particles and dust when used for a long time in harsh working conditions, thereby preventing the dropped particles and dust from affecting the performance of the battery pack; the protective layer 142 can also prevent the first core column 141 from absorbing water, thereby enhancing the insulation and withstand voltage of the overall structure of the battery pack filling module 14.

[0063] like Figure 7 , Figure 8 As shown, in one embodiment, the battery pack filling module 14 further includes:

[0064] The groove 143 is arranged on the side of the first core column 141, extending along the length direction of the first core column 141, and is used to form the airflow channel 13 and / or the harness channel 13. The groove 143 can be a rectangular groove, a trapezoidal groove or the like. The length of the groove 143 can be equal to the length of the first core column 141, forming a through groove on the side of the first core column 141; the length of the groove 143 can also be less than the length of the first core column 141, forming a one-end closed groove or a two-end closed groove on the side of the first core column 141.

[0065] The airflow channel 13 is used for exhaust in case of thermal runaway. When the battery pack is in thermal runaway, the high-temperature gas in the pack can be discharged from the airflow channel 13. The wiring harness channel 13 is used to store high and low voltage connecting wires. The groove 143 can have both functions at the same time or only one of them.

[0066] like Figure 8 As shown, in one embodiment, the battery pack filling module 14 further includes:

[0067] The second core column 144 is arranged inside the first core column 141. The second core column 144 is made of lightweight material. By setting the second core column 144, the weight of the battery pack filling module 14 can be reduced without affecting the structural strength.

[0068] The density of the lightweight material used in the second core column 144 is less than the density of the inorganic material used in the first core column 141, or the density of the lightweight material used in the second core column 144 is not greater than 300 g / cm 3 .

[0069] In one embodiment, the lightweight material is foam, and the foam can be ordinary foam or foam with flame retardant properties. Of course, other types of lightweight materials can also be selected.

[0070] The flame retardant foam has the characteristics of being porous, low in density, difficult to burn, and having a certain supporting strength. It is arranged in the second core column 144 to reduce the overall density and achieve the goal of lightweighting while ensuring the strength and high temperature resistance of the battery pack filling module.

[0071] In one embodiment, the inorganic material is a silicate material, and the silicate material can be a common silicate material or a silicate material with foaming properties.

[0072] Foamed silicate is prepared by mixing granular sand, silicate, quick-drying gel, glass fiber, water and other raw materials in a certain proportion, injecting them into a mold for mixing, and demoulding after standing and curing.

[0073] In one embodiment, the inorganic material is a cement-based material, and the cement-based material can be selected from ordinary cement-based materials or cement-based materials with foaming properties. Using cement as a filling structural member can maintain structural integrity at high temperatures and ensure structural strength.

[0074] Foamed cement is made by mixing granular sand, cement, quick-drying gel, glass fiber and water in a certain proportion, injecting it into a mold, mixing it, and then removing it from the mold after standing and curing. Foamed cement is integrally formed and can be poured independently. It has fewer production processes and lower equipment requirements. It can be produced on a small scale, has stable performance, and has cost advantages.

[0075] If a second core column 144 is required, a certain amount of the mixed raw material is first injected into the mold during the molding process. At this time, the mold is not full of raw materials, and then the lightweight material is put into the mixed raw material in the mold. Finally, the mixed raw materials are continuously injected until the mold is closed. Filling cement with lightweight materials such as foam can achieve the purpose of lightweighting and reduce the density of the battery pack filling module.

[0076] Taking foamed cement as an example, it can be integrally formed and poured independently, has fewer production processes, has lower equipment requirements, can be produced on a small scale, and has stable performance. The density of foamed cement is close to 1000g / cm 3 After filling with lightweight foam inside, the overall density can be reduced to 500g / cm 3 The density is much lower than that of plastic parts. The foamed cement filled with lightweight foam can maintain the integrity of the overall structure without cracking at a high temperature of 600°C for 8 hours. At high temperatures, the foam melts, the foamed cement structure is intact, and the overall structural strength still meets the requirements of the battery pack filling structural parts. In the event of thermal runaway of the battery pack, the overall structure of the filling parts can be guaranteed to be intact, resist the expansion force of the battery cells, avoid arcing caused by pulling of metal parts, and discharge high-temperature gases according to the original exhaust route, reducing the risk of causing thermal runaway chain reactions.

[0077] The foamed cement manufactured by this method has a simple structure and avoids the weight reduction of similar plastic parts by designing internal reinforcement ribs, thereby improving design efficiency and mold opening efficiency, greatly reducing mold opening costs, and relatively low equipment requirements. Even for small batches or urgent needs, production through molds is still a cost-effective processing method.

[0078] In one embodiment, the protective layer 142 is a coating or an encapsulation layer. The coating may be a paint layer, and the encapsulation layer may be a plastic layer, such as PET, POF, PP, PE, forming a dense protective structure on the outer surface of the first core column 141 to effectively prevent falling particles and dust.

[0079] like Figure 4 , Figure 5 , Figure 6 As shown, an embodiment of the utility model provides a battery pack, including a battery cell 2, and also includes a battery pack filling module described in any one of the above embodiments.

[0080] In one embodiment, the battery pack further comprises:

[0081] An outer frame 1, wherein the outer frame 1 is provided with a battery compartment;

[0082] The battery cell 2 is arranged in the battery compartment. The battery compartment is usually provided with a plurality of battery cells 2, and the plurality of battery cells 2 are connected in series or in parallel;

[0083] The battery pack filling modules 12 and 14 are disposed in the battery compartment.

[0084] In one embodiment, the battery pack filling modules 12 , 14 are disposed in the space between the side surfaces of the battery cells 2 and the outer frame 1 .

[0085] If necessary, a battery pack filling module may also be provided in the space between the end surface of the battery cell 2 and the outer frame 1 .

[0086] In one embodiment, the battery pack filling module is disposed in the space between any adjacent battery cells 2 .

[0087] In one embodiment, the groove 143 of the battery pack filling module faces the outer frame 1 or the bottom of the battery pack, forming an air flow channel 13 and / or a wiring harness channel 13 .

[0088] In one embodiment, the groove 143 of the battery pack filling module faces the end of the battery cell 2, forming an air flow channel 13 and / or a wiring harness channel 13. In this case, the groove 143 needs to be set corresponding to the explosion-proof valve of the battery cell 2, such as Figure 5 The battery cell 2 shown in the figure is provided with a connecting piece 23 at one end and an explosion-proof valve at the other end. In this case, the groove 143 needs to be provided corresponding to the other end of the battery cell 2 .

[0089] An embodiment of the utility model further provides an electrical device, comprising the battery pack described in any one of the above embodiments.

[0090] The electrical equipment may be a vehicle, a ship, a spacecraft, an energy storage device, etc. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. The spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical equipment.

[0091] The utility model provides a battery pack filling module, a battery pack and an electric device, which have the following characteristics:

[0092] The battery pack filling module is made of inorganic materials, which have the advantages of low density, high compressive strength, good insulation pressure resistance, and low cost. It can maintain structural integrity at high temperatures during thermal runaway to ensure structural strength. The shape of the battery cell remains unchanged during thermal runaway, and the outer insulation film of the battery cell will not break, thereby protecting the shell from being exposed to the outside and eliminating the possibility of contact between the shell and external metal. The connecting pieces on the battery cell and between the battery cells will not be pulled out of place due to the deformation of the battery cell, thereby affecting the electrical clearance and creepage distance of the original design, and the battery cell can open the valve normally.

[0093] The battery pack filling module can successfully resist the expansion force of the battery cell during thermal runaway, so that the battery cell does not undergo serious deformation. As a result, the exhaust channel reserved when designing the package will not be blocked by the deformation of the battery cell, and the material used in the exhaust channel itself will not melt and fail, ensuring the integrity of the exhaust channel during thermal runaway. Therefore, the exhaust channel can play a role during thermal runaway, and the package explosion-proof valve can also open normally.

[0094] In the short blade platform package, the battery cells are placed in two to three chambers. The exhaust channel does not fail during thermal runaway, ensuring that the high-temperature gas is discharged from the package through the explosion-proof valve according to the original exhaust path. Otherwise, the high-temperature gas may cross the cavity, and the thermal runaway gas may generate sparks and arc with other metal parts. Even the high-temperature gas is discharged from the upper cover cold plate, causing the package seal to fail.

[0095] For battery packs such as the short blade platform, the battery pack filling module can be designed to have a contour structure of the same size as the battery cell, which is convenient for platform design and improves design efficiency. It can be stacked together with the battery cell during packaging, greatly improving packaging efficiency.

[0096] The processes and steps described in all the above preferred embodiments are only examples. Unless adverse effects occur, various processing operations can be performed in a sequence different from the sequence of the above processes. The sequence of steps in the above processes can also be increased, merged or deleted according to actual needs.

[0097] In understanding the scope of the present invention, the term "comprising" and its derivatives as used herein are intended to be open terms, which specify the existence of the recorded features, elements, components, groups, wholes and / or steps, but do not exclude the existence of other unrecorded features, elements, components, groups, wholes and / or steps. This concept also applies to words with similar meanings, such as the terms "including", "having" and their derivatives.

[0098] The terms "attached" or "attached" as used herein include: a configuration where an element is directly secured to another element by directly securing the element to the other element; a configuration where an element is indirectly secured to another element by securing the element to an intermediate member which in turn is secured to the other element; and a configuration where one element is integral with the other element, i.e., one element is substantially a part of the other element. This definition also applies to words with similar meanings such as "connect," "connect," "couple," "mount," "bond," "fix," and their derivatives. Finally, terms of degree such as "substantially," "approximately," and "approximately" as used herein represent the amount of deviation that modifies the term such that the end result will not be significantly changed.

[0099] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein are only for describing specific implementation purposes and are not intended to limit the present invention. The features described herein in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable or otherwise specified in the other embodiment.

[0100] The utility model has been described through the above-mentioned embodiments, but it should be understood that the above-mentioned embodiments are only for the purpose of example and description, and are not intended to limit the utility model to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the utility model is not limited to the above-mentioned embodiments, and more variations and modifications can be made according to the teachings of the utility model, and these variations and modifications all fall within the scope of protection claimed by the utility model.

Claims

1. A battery pack filling module, characterized in that: include: A first core column (141), wherein the first core column (141) is made of inorganic material and is in a prism shape.

2. The battery pack filling module according to claim 1, characterized in that: Also includes: A protective layer (142), wherein the protective layer (142) is disposed on the outer surface of the first core column (141).

3. The battery pack filling module according to claim 1, characterized in that: Also includes: A groove (143), wherein the groove (143) is arranged on a side surface of the first core column (141), extends along the length direction of the first core column (141), and is used to form an airflow channel and / or a wiring harness channel.

4. The battery pack filling module according to claim 1, characterized in that: Also includes: A second core column (144), wherein the second core column (144) is arranged inside the first core column (141), and the second core column (144) is made of a lightweight material.

5. The battery pack filling module according to claim 4, characterized in that: The lightweight material is foam.

6. The battery pack filling module according to claim 1, characterized in that: The inorganic material is a silicate material.

7. The battery pack filling module according to claim 1, characterized in that: The inorganic material is a cement-based material.

8. The battery pack filling module according to claim 2, characterized in that: The protective layer (142) is a coating layer or a packaging layer.

9. A battery pack, comprising a battery cell (2), characterized in that: It also includes a battery pack filling module according to any one of claims 1-8.

10. The battery pack according to claim 9, characterized in that: Also includes: An outer frame (1), wherein the outer frame (1) is provided with a battery compartment; The battery cell (2) is arranged in the battery compartment; The battery pack filling module is arranged in the battery compartment.

11. The battery pack according to claim 10, characterized in that: The battery pack filling module is arranged in the space between the side surface and / or end surface of the battery cell (2) and the outer frame (1).

12. The battery pack according to claim 10, characterized in that: The battery pack filling module is arranged in the space between any adjacent battery cells (2).

13. The battery pack according to claim 10, characterized in that: The groove (143) of the battery pack filling module faces the outer frame (1) or the bottom of the battery pack, forming an air flow channel and / or a wiring harness channel.

14. The battery pack according to claim 10, characterized in that: The groove (143) of the battery pack filling module faces the end of the battery cell (2) to form an air flow channel and / or a wiring harness channel.

15. An electrical equipment, characterized in that: Comprising a battery pack according to any one of claims 9-14.

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