Lithium battery assembly with high strength protective structure

Abstract

The utility model discloses a lithium battery assembly with high -strength protection structure, including battery case and the multiple electric core of being located in the battery case, the electric core is equipped with the electrode terminal of unified direction, the electrode terminal is through the flexible connecting piece and is electrically connected each other, the battery case includes the outer protective layer of being made of hard impact -resistant material, the inner buffer layer of being filled with viscoelastic composite filling body and fixed bolster. Whole structure can effectively promote security performance and operating stability. The outer protective layer takes hard impact -resistant material as the main part, can resist the drop impact, greatly enhances the whole and vulnerable area impact -resistant capacity, avoids the shell breakage and partial stress concentration fracture. The viscoelastic composite filling body of inner buffer layer, through the non - newton fluid microcapsule instantaneous resistance, the elastic microsphere continues to shock attenuation, and the impact energy absorption efficiency is superior to ordinary silica gel.

Description

Technical Field

[0001] This utility model relates to the field of battery component technology, specifically to a lithium battery component with a high-strength protective structure. Background Technology

[0002] As a core energy component in new energy vehicles, energy storage equipment and other fields, the safety performance of lithium batteries directly determines the reliability of equipment operation. Especially under complex working conditions such as bumps and collisions, they need to resist external impacts, absorb vibrations and adapt to the thermal expansion characteristics of the battery cells.

[0003] Existing lithium battery modules have several shortcomings: External protection often uses a single rigid shell, which, while able to withstand minor impacts, lacks sufficient strength in vulnerable areas and fails to provide adequate shock absorption; internal buffers are mostly made of ordinary elastic materials, resulting in low impact energy absorption efficiency, and a single cell malfunction can easily trigger a chain reaction of failures; cell fixing often relies on simple limiting mechanisms, which are prone to displacement during thermal expansion or vibration, increasing the risk of short circuits. In summary, existing structures cannot meet the requirements for high-strength protection and stability, necessitating a lithium battery module design that balances impact resistance, precise fixing, and comprehensive protection. Utility Model Content

[0004] In order to overcome the shortcomings of existing technical solutions, this utility model provides a lithium battery assembly with a high-strength protective structure, which can effectively solve the problems mentioned in the background art.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A lithium battery assembly with a high-strength protective structure includes a battery casing and multiple battery cells disposed within the battery casing. The battery cells are provided with electrode terminals facing the same direction. The electrode terminals are electrically connected to each other through flexible connecting pieces. The battery casing includes an outer protective layer made of rigid impact-resistant material, an inner buffer layer filled with viscoelastic composite filler, and a fixing bracket.

[0007] The inner buffer layer is tightly attached to the inner side of the outer protective layer. The inner side of the outer protective layer is provided with a plurality of first reinforcing ribs arranged in the circumferential direction. An independent chamber for accommodating the battery cell is pre-formed in the inner buffer layer. The fixing bracket is embedded in the bottom of the independent chamber. The fixing bracket is provided with a slot that matches the outer contour of the battery cell.

[0008] The outer protective layer has a wiring protection cover plate on its top inner side, and the lower surface of the wiring protection cover plate has a recessed platform corresponding to the position of the electrode wiring end, and the flexible connecting piece is located in the recessed platform.

[0009] As a further description of the above technical solution, the corner area of ​​the outer protective layer is provided with a thickened part, and the inner side of the thickened part is provided with a second reinforcing rib, which is distributed radially or in a grid pattern.

[0010] As a further description of the above technical solution, there is an axial compression space of 0.5mm-2mm between the inner wall of the independent chamber and the outer surface of the battery cell, and the bottom of the independent chamber is provided with ventilation micropores.

[0011] As a further description of the above technical solution, the opening end of the card slot is provided with an inwardly extending limiting flange.

[0012] As a further description of the above technical solution, the edge of the wiring protective cover is provided with a downwardly extending sidewall, and the sidewall is detachably connected to the inner wall of the outer protective layer through a snap-fit ​​structure.

[0013] As a further description of the above technical solution, the bottom inner side of the outer protective layer is provided with a metal heat-conducting plate that is in contact with the surface of the inner buffer layer, and the upper surface of the metal heat-conducting plate is provided with protruding heat-conducting columns corresponding to the bottom of the independent chamber.

[0014] As a further description of the above technical solution, a sealing groove is provided at the top opening of the outer protective layer, and a sealing rib that cooperates with the sealing groove is provided on the lower surface of the wiring protection cover.

[0015] As a further description of the above technical solution, the side wall of the battery casing is provided with a glue injection channel communicating with the inner buffer layer, and the outer end of the glue injection channel is sealed by a sealing plug.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] The lithium battery assembly with a high-strength protective structure of this utility model has at least one of the following beneficial effects during use:

[0018] The overall structure effectively enhances safety performance and operational stability. The outer protective layer is primarily made of rigid, impact-resistant material, complemented by a circumferential first reinforcing rib, thickened corner sections, and radial / grid-like second reinforcing ribs. This design resists drop impacts, significantly enhancing the overall and vulnerable areas' impact resistance and preventing shell breakage and localized stress concentration fractures. The viscoelastic composite filler in the inner buffer layer utilizes non-Newtonian fluid microcapsules for instantaneous impact resistance and elastic microspheres for continuous shock absorption. Its impact energy absorption efficiency is superior to ordinary silicone. Furthermore, independent chambers isolate individual battery cells, preventing cascading effects from abnormal conditions. The axial compression space accommodates the thermal expansion of the battery cells, and venting micropores allow for the discharge of small amounts of gas to prevent excessive pressure. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the first overall structure of a lithium battery assembly with a high-strength protective structure according to the present invention;

[0020] Figure 2This is a schematic diagram of the second overall structure of a lithium battery assembly with a high-strength protective structure according to the present invention;

[0021] Figure 3 This is a first perspective structural diagram of a lithium battery assembly with a high-strength protective structure according to the present invention.

[0022] Figure 4 This is a second perspective structural diagram of a lithium battery assembly with a high-strength protective structure according to the present invention.

[0023] Numbering on the map:

[0024] 1. Battery casing; 101. Outer protective layer; 102. Inner buffer layer; 103. Wiring protection cover; 104. Recessed platform; 105. Second reinforcing rib; 106. First reinforcing rib; 107. Independent chamber; 2. Battery cell; 201. Electrode terminal; 3. Fixing bracket; 301. Metal heat-conducting plate; 302. Raised heat-conducting column; 303. Slot; 304. Limiting flange. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] like Figure 1-4 As shown, this utility model provides a lithium battery assembly with a high-strength protective structure, including a battery housing 1 and a plurality of battery cells 2 disposed in the battery housing 1. The battery cells 2 are provided with electrode terminals 201 facing the same direction. The electrode terminals 201 are electrically connected to each other through flexible connecting pieces. The battery housing 1 includes an outer protective layer 101 made of rigid impact-resistant material, an inner buffer layer 102 filled with viscoelastic composite filler, and a fixing bracket 3.

[0027] The viscoelastic composite filler is a composite material in which non-Newtonian fluid microcapsules and elastic microspheres are uniformly dispersed in a silicone matrix.

[0028] The fixing bracket 3 is integrally injection molded from glass fiber reinforced nylon. It is provided with a slot 303 that matches the outer contour of the battery cell 2, and a limiting flange 304 is provided at the opening end of the slot 303. Glass fiber reinforced nylon has high strength and high and low temperature resistance, and integral injection molding ensures the stability of the bracket structure; the slot 303 matches the contour of the battery cell 2 to achieve "one-to-one" precise fixation, and the limiting flange 304 prevents the battery cell 2 from falling out of the slot 303 during vibration, impact or thermal expansion, ensuring that the position of the battery cell 2 remains stable.

[0029] The main body is made of hard impact-resistant materials (such as high-strength plastics, alloys, etc.), with a first circumferential reinforcing rib 106 on the inner side and a thickened part and a radial / grid second reinforcing rib 105 in the corner area.

[0030] The rigid material directly blocks external forces such as collisions and compression, preventing the shell from breaking directly; the first reinforcing rib 106 enhances the overall rigidity of the shell and prevents sidewall deformation; the thickened corner section and the second reinforcing rib 105 reinforce the corner area where collisions are frequent, and disperse the impact force through a radial / grid structure to avoid local stress concentration leading to fracture.

[0031] The battery cell 2 is filled with a viscoelastic composite filler (silicone matrix + non-Newtonian fluid microcapsules + elastic microspheres). The pre-formed independent chamber 107 accommodates the battery cell 2. An axial compression space of 0.5mm-2mm is left between the chamber and the battery cell 2. A ventilation micropore is provided at the bottom.

[0032] When an external impact is transmitted to the inner buffer layer 102, the non-Newtonian fluid microcapsules "solidify" under instantaneous impact and quickly absorb the impact energy; the elastic microspheres, on the other hand, buffer continuous vibration or low-frequency impact through deformation and rebound. The two work together to achieve "instantaneous impact resistance + continuous vibration reduction".

[0033] The independent chamber 107 isolates the individual battery cell 2 to prevent abnormalities in one battery cell 2 (such as expansion or damage) from affecting other battery cells 2; the axial compression space is reserved for thermal expansion of the battery cell 2 during operation to prevent the battery cell 2 from being squeezed and deformed; the venting micropores can discharge the trace amounts of gas generated by the battery cell 2 during operation to prevent excessive pressure in the chamber from causing the buffer layer to rupture.

[0034] The inner buffer layer 102 is tightly attached to the inner side of the outer protective layer 101. The inner side of the outer protective layer 101 is provided with a plurality of first reinforcing ribs 106 arranged in the circumferential direction. An independent chamber 107 for accommodating the battery cell 2 is pre-formed in the inner buffer layer 102. The fixing bracket 3 is embedded in the bottom of the independent chamber 107. The fixing bracket 3 is provided with a slot 303 that matches the outer contour of the battery cell 2.

[0035] The outer protective layer 101 has a wiring protection cover plate 103 on its top inner side. The lower surface of the wiring protection cover plate 103 has a recessed platform 104 corresponding to the position of the electrode wiring terminal 201. The flexible connecting piece is located inside the recessed platform 104.

[0036] The depth of the recessed platform 104 is greater than the thickness of the flexible connecting piece. The flexible connecting piece can accommodate slight displacement or expansion of the battery cell 2, avoiding poor contact caused by deformation of the rigid connection; the recessed platform 104 provides space for the flexible connecting piece to prevent the connecting piece from being squeezed when the cover plate is pressed, ensuring stable conductivity.

[0037] The electrode terminals 201 of cell 2 are electrically connected via flexible connecting pieces. A wiring protection cover 103 is provided on the top of the outer protective layer 101. A recessed platform 104 (depth > thickness of the flexible connecting piece) is provided on the lower surface of the cover. The edge of the cover has sidewalls that are detachably connected to the outer protective layer 101 via snap-fits. A sealing groove is provided at the top opening to cooperate with the sealing rib of the cover. The wiring protection cover 103 isolates external dust and moisture from the electrode terminals 201, preventing short circuits. The snap-fit ​​structure facilitates assembly and maintenance, and the sealing groove and sealing rib cooperate to improve overall sealing performance, further preventing the intrusion of external impurities.

[0038] Furthermore, the outer protective layer 101 has a thickened portion at the corner, and a second reinforcing rib 105 is provided on the inner side of the thickened portion. The second reinforcing rib 105 is distributed radially or in a grid pattern.

[0039] The rigid outer protective layer 101 and the reinforcing rib structure can withstand the impact of a drop from a height of 1.5m. The thickened corner and the second reinforcing rib 105 can greatly improve the local impact resistance. The non-Newtonian fluid microcapsule and elastic microsphere combination of the inner buffer layer 102 has a significantly improved impact energy absorption efficiency compared with ordinary silicone buffer, which can effectively avoid the cell 2 from cracking and leakage caused by impact.

[0040] The multi-layered protective structure can simultaneously cope with complex scenarios such as "drop impact, vibration, and extrusion", making it suitable for fields with high battery safety requirements, such as new energy vehicles and energy storage equipment.

[0041] Furthermore, the inner wall of the independent chamber 107 has an axial compression space of 0.5mm-2mm between it and the outer surface of the battery cell 2, and the bottom of the independent chamber 107 is provided with ventilation micropores.

[0042] The axial compression space of 0.5mm-2mm can accommodate the volume expansion of cell 2 during charging and discharging, and avoid cell 2 being rigidly squeezed, which would cause the diaphragm to break.

[0043] Furthermore, the opening end of the card slot 303 is provided with an inwardly extending limiting flange 304.

[0044] The limiting flange 304 is used to prevent the cell 2 from shifting due to temperature changes or vibration, thereby reducing the risk of short circuit between the cells 2.

[0045] Furthermore, the edge of the wiring protection cover 103 is provided with a downwardly extending sidewall, and the sidewall is detachably connected to the inner wall of the outer protective layer 101 by a snap-fit ​​structure.

[0046] The recessed platform 104 design completely avoids the pressure of the wiring cover on the flexible connecting piece, which can stabilize the fluctuation of the contact resistance of the connecting piece and reduce local heating caused by poor contact.

[0047] Furthermore, the bottom inner side of the outer protective layer 101 is provided with a metal heat-conducting plate 301 that is attached to the surface of the inner buffer layer 102, and the upper surface of the metal heat-conducting plate 301 is provided with protruding heat-conducting columns 302 corresponding to the bottom of the independent chamber 107.

[0048] The metal heat-conducting plate 301 (such as aluminum or copper) quickly conducts the heat generated by the battery cell 2 to the outside of the casing. The raised heat-conducting pillars 302 increase the contact area with the inner buffer layer 102 / battery cell 2, improve heat dissipation efficiency, and prevent the battery cell 2 from overheating and aging.

[0049] Furthermore, the top opening of the outer protective layer 101 is provided with a sealing groove, and the lower surface of the wiring protection cover 103 is provided with a sealing rib that cooperates with the sealing groove.

[0050] The sealing groove and its corresponding sealing ribs prevent moisture and dust from corroding the electrode terminals 201, extending the terminal's lifespan to the entire battery lifespan. The terminal cover is connected via snap-fit, eliminating the need for screws and improving assembly efficiency.

[0051] Furthermore, the side wall of the battery casing 1 is provided with an injection channel that communicates with the inner buffer layer 102, and the outer end of the injection channel is sealed by a sealing plug.

[0052] The side wall of the battery casing 1 is provided with an adhesive injection channel communicating with the inner buffer layer 102, and the outer end is sealed with a sealing plug. If there are small gaps in the inner buffer layer 102 during assembly, viscoelastic filler can be added through the adhesive injection channel to ensure the integrity of the buffer layer; the sealing plug prevents the filler from leaking or external impurities from entering.

[0053] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A lithium battery assembly with a high-strength protective structure, comprising a battery casing and a plurality of battery cells disposed within the battery casing, characterized in that, The battery cell has electrode terminals facing the same direction, and the electrode terminals are electrically connected to each other through flexible connecting pieces. The battery casing includes an outer protective layer made of rigid impact-resistant material, an inner buffer layer filled with viscoelastic composite filler, and a fixing bracket. The inner buffer layer is tightly attached to the inner side of the outer protective layer. The inner side of the outer protective layer is provided with a plurality of first reinforcing ribs arranged in the circumferential direction. An independent chamber for accommodating the battery cell is pre-formed in the inner buffer layer. The fixing bracket is embedded in the bottom of the independent chamber. The fixing bracket is provided with a slot that matches the outer contour of the battery cell. The top inner side of the outer protective layer is provided with a wiring protection cover plate, and the lower surface of the wiring protection cover plate is provided with a recessed platform corresponding to the position of the electrode wiring end, and the flexible connecting piece is located in the recessed platform.

2. A lithium battery assembly with a high-strength protective structure according to claim 1, characterized in that: The outer protective layer has a thickened section at the corner, and a second reinforcing rib is provided on the inner side of the thickened section. The second reinforcing rib is distributed radially or in a grid pattern.

3. A lithium battery assembly with a high-strength protective structure according to claim 1, characterized in that: The independent chamber has an axial compression space of 0.5mm-2mm between its inner wall and the outer surface of the battery cell, and the bottom of the independent chamber is provided with ventilation micropores.

4. A lithium battery assembly with a high-strength protective structure according to claim 1, characterized in that: The slot has an inwardly extending limiting flange at its open end.

5. A lithium battery assembly with a high-strength protective structure according to claim 1, characterized in that: The edge of the wiring protective cover is provided with a downwardly extending sidewall, which is detachably connected to the inner wall of the outer protective layer by a snap-fit ​​structure.

6. A lithium battery assembly with a high-strength protective structure according to claim 1, characterized in that: The bottom inner side of the outer protective layer is provided with a metal heat-conducting plate that is attached to the surface of the inner buffer layer, and the upper surface of the metal heat-conducting plate is provided with protruding heat-conducting columns corresponding to the bottom of the independent chamber.

7. A lithium battery assembly with a high-strength protective structure according to claim 1, characterized in that: The top opening of the outer protective layer is provided with a sealing groove, and the lower surface of the wiring protection cover is provided with a sealing rib that cooperates with the sealing groove.

8. A lithium battery assembly with a high-strength protective structure according to claim 1, characterized in that: The side wall of the battery casing is provided with an injection channel that communicates with the inner buffer layer, and the outer end of the injection channel is sealed by a sealing plug.

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