Reinforced lithium ion battery module

Abstract

The utility model discloses a reinforced lithium ion battery module and relates to the technical field of lithium batteries. A reinforced lithium ion battery module comprises a module frame, a placement groove is formed in the top of the module frame, an expansion limiting structure is located on the module frame, the expansion limiting structure comprises two module end plates and four lifting plates, mounting grooves are formed in the two sides of the module frame, the two module end plates are fixedly connected into the corresponding mounting grooves, and the lifting plates are fixedly connected into the mounting grooves. The four hoisting plates are fixedly connected into the corresponding module end plates, and the two module end plates can reinforce the module frame, so that the overall weight can be reduced and the energy density of the battery module can be improved while the uniform expansion stress of the battery cell is ensured; therefore, the two module end plates can conveniently protect key parts such as the battery cell and the like, the key parts are prevented from being damaged due to excessive expansion, the influence on the service life of the battery cell due to excessive expansion of the battery cell is avoided, and the service life of the battery is further prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a reinforced lithium-ion battery module. Background Art

[0002] Lithium-ion batteries have been widely used in electric vehicles, energy storage systems, and portable electronic devices due to their high energy density, long life, and environmentally friendly properties.

[0003] During use, traditional battery modules experience significant changes in thickness during charge and discharge, particularly in graphite anode systems, due to changes in the thickness of the battery electrodes and gases generated by the oxidation and decomposition of the electrolyte. The anode expansion rate can even exceed 20%. Furthermore, the solvent in the electrolyte generates free radicals after receiving electrons, which in turn generate low-boiling-point hydrocarbons, esters, ethers, and CO2 gases. This increases the internal pressure of the battery cell, causing it to expand. During this expansion, the cell may be subjected to uneven pressure, which can cause cell deformation, voids to form between the electrode and the separator, microcracks in the anode particles, and rupture and recombination of the solid electrolyte interface (SEI) film. These factors deplete the electrolyte and reduce the battery's cycling performance. Therefore, we propose a reinforced lithium-ion battery module. Utility Model Content

[0004] The purpose of the present utility model is to solve at least one of the technical problems existing in the prior art, and to provide a reinforced lithium-ion battery module that can solve the problem of significant thickness changes and negative electrode expansion rate exceeding 20% ​​during the charge and discharge process, especially in graphite negative electrode systems, due to changes in battery electrode thickness and the generation of gases due to oxidative decomposition of the electrolyte. In addition, the solvent in the electrolyte generates free radicals after receiving electrons, which in turn generate low-boiling point hydrocarbons, esters, ethers, and CO2 gases, resulting in increased internal pressure in the battery cell, which in turn causes expansion. The battery cell may be subjected to uneven pressure during the expansion process, which in turn causes deformation of the battery cell, formation of voids between the electrode and the separator, microcracks in the negative electrode particles, and rupture and recombination of the solid electrolyte interface (SEI) film, all of which consume electrolyte and reduce the cycle performance of the battery.

[0005] To achieve the above objectives, the present invention provides the following technical solutions: a reinforced lithium-ion battery module, comprising:

[0006] A module frame, wherein a placement slot is provided on the top of the module frame;

[0007] Expansion limiting structure, the expansion limiting structure is located on the module frame;

[0008] The expansion limiting structure includes two module end plates and four lifting plates. Installation slots are provided on both sides of the module frame. The two module end plates are fixedly connected in the corresponding installation slots. The four lifting plates are fixedly connected in the corresponding module end plates. The four lifting plates are provided with lifting slots on the side away from the module frame.

[0009] Preferably, three mounting holes are provided on the bottom of the two module end plates, and the same three mounting holes are provided on the inner bottom walls of the two mounting grooves.

[0010] Preferably, an insulating cover is installed inside the placement groove, and a plurality of battery cells are installed inside the insulating cover.

[0011] Preferably, a plurality of collection pieces are installed on the top of the insulating cover, and a temperature collection point and a voltage collection point are opened on the top of each of the plurality of collection pieces.

[0012] Preferably, two pressure strips are installed on the top of the module frame, the bottoms of the two pressure strips are in contact with the top of the insulation cover, and the insides of the two pressure strips are provided with cable grooves.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. The reinforced lithium-ion battery module is provided with two module end plates, which enable the two module end plates to reinforce the module frame, thereby ensuring that the battery cells are evenly expanded while reducing the overall weight and improving the energy density of the battery module. The two module end plates are convenient for protecting key parts such as the battery cells to prevent them from being damaged due to excessive expansion, avoiding the battery cells from being affected by excessive expansion and affecting their service life, thereby further improving the service life of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the layering structure of the present utility model;

[0018] Figure 3 For the utility model Figure 1 Schematic diagram of the enlarged structure at A in the middle;

[0019] Figure 4 This is a schematic diagram of the battery cell structure of the present utility model.

[0020] Figure numerals: 1. Module frame; 2. Mounting slot; 3. Mounting hole; 4. Lifting plate; 5. Module end plate; 6. Pressure strip; 7. Cable trough; 8. Insulation cover; 9. Collection piece; 10. Temperature collection point; 11. Voltage collection point; 12. Battery cell; 13. Placement slot. DETAILED DESCRIPTION

[0021] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0022] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0023] In the description of this utility model, terms such as "greater than," "less than," and "exceed" are understood to exclude the number indicated, while terms such as "above," "below," and "within" are understood to include the number indicated. The terms "first" and "second" are used solely to distinguish technical features and are not to be construed as indicating or implying relative importance, or as implicitly specifying the number or order of the technical features indicated.

[0024] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0025] See also Figure 1-4 The utility model provides a technical solution: a reinforced lithium-ion battery module, comprising:

[0026] Module frame 1, a placement slot 13 is opened on the top of the module frame 1;

[0027] Expansion limiting structure, the expansion limiting structure is located on the module frame 1;

[0028] The expansion limiting structure includes two module end plates 5 and four hanging plates 4. Installation grooves 2 are provided on both sides of the module frame 1. The two module end plates 5 are fixedly connected in the corresponding installation grooves 2. The four hanging plates 4 are fixedly connected in the corresponding module end plates 5. The four hanging plates 4 are provided with hanging grooves on the side away from the module frame 1.

[0029] Three mounting holes 3 are provided at the bottom of the two module end plates 5, and the same three mounting holes 3 are provided on the inner bottom walls of the two mounting grooves 2. An insulating cover 8 is installed inside the placement groove 13, and multiple battery cells 12 are installed inside the insulating cover 8. Multiple collection pieces 9 are installed on the top of the insulating cover 8, and temperature collection points 10 and voltage collection points 11 are provided on the tops of the multiple collection pieces 9.

[0030] Two holding strips 6 are installed on the top of the module frame 1 . The bottoms of the two holding strips 6 are in contact with the top of the insulating cover 8 . Wire arrangement grooves 7 are provided inside the two holding strips 6 .

[0031] Furthermore, when using the device, the two module end plates 5 are set, so that the module frame 1 can work for a long time in a hard-hitting vibration environment. At the same time, it can also work normally in a high-intensity mechanical shock environment, and ensures that the product's service life and life in harsh environments are greatly improved. The battery cell 12 is installed in the module frame 1 through the clamping force, which can greatly improve the cycle life of the battery cell 12 itself. The two lifting plates 4 set in the two module end plates 5 facilitate the lifting and installation of the module frame 1. Each battery cell 12 is set with a temperature collection point 10 and a voltage collection point 11 to better ensure the safety of the product.

[0032] By setting up two module end plates 5, the two module end plates 5 can reinforce the module frame 1, thereby ensuring that the battery cell 12 is evenly expanded and stressed, while reducing the overall weight and improving the energy density of the battery module. This makes it easier for the two module end plates 5 to protect key parts such as the battery cell 12, preventing them from being damaged due to excessive expansion, avoiding the battery cell 12 from affecting its service life due to excessive expansion, and further improving the service life of the battery.

[0033] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A reinforced lithium-ion battery module, characterized in that: include: A module frame (1), wherein a placement slot (13) is provided on the top of the module frame (1); An expansion limiting structure, the expansion limiting structure is located on the module frame (1); The expansion limiting structure comprises two module end plates (5) and four hanging plates (4); mounting grooves (2) are provided on both sides of the module frame (1); and the two module end plates (5) are fixedly connected in the corresponding mounting grooves (2); The four hanging plates (4) are all fixedly connected to the corresponding module end plates (5), and the four hanging plates (4) are each provided with a hanging groove on one side away from the module frame (1).

2. The reinforced lithium-ion battery module according to claim 1, characterized in that: The bottoms of the two module end plates (5) are each provided with three mounting holes (3), and the inner bottom walls of the two mounting grooves (2) are each provided with the same three mounting holes (3).

3. The reinforced lithium-ion battery module according to claim 1, characterized in that: An insulating cover (8) is installed inside the placement groove (13), and a plurality of battery cells (12) are installed inside the insulating cover (8).

4. The reinforced lithium-ion battery module according to claim 3, characterized in that: A plurality of collection pieces (9) are installed on the top of the insulating cover (8), and a temperature collection point (10) and a voltage collection point (11) are provided on the top of each of the plurality of collection pieces (9).

5. The reinforced lithium-ion battery module according to claim 3, characterized in that: Two pressure strips (6) are installed on the top of the module frame (1), the bottoms of the two pressure strips (6) are in contact with the top of the insulation cover (8), and the insides of the two pressure strips (6) are provided with a wire arrangement groove (7).

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