Battery pack

Abstract

The application relates to the battery technical field and discloses a battery pack, which comprises a battery cell box and a soft package battery cell installed in the battery cell box, further comprises a supporting piece installed between the battery cell box and the soft package battery cell, the supporting piece covers at least two surfaces of the soft package battery cell, and the supporting piece abuts against the inner wall of the battery cell box. The above scheme not only improves the damping and anti-micro-motion performance, reduces the abnormal sound, reduces the risk of local bruising of the aluminum plastic film, and improves the assembly efficiency and long-term reliability.

Description

Technical Field

[0001] This application relates to the field of batteries, and more specifically, to battery packs. Background Technology

[0002] Existing pouch cells use aluminum-plastic film as their outer shell, which is flexible and easily deformed, resulting in poorer dimensional consistency compared to steel-cased cells. During battery pack stacking and assembly, soft material is typically filled between the cells and the inner wall of the cell box to compensate for cavities caused by dimensional differences and to provide cushioning and fixation under vibration conditions.

[0003] However, when soft materials are pre-applied to the periphery of the battery cell or the inner wall of the battery cell box before being inserted into the battery cell assembly, problems such as high assembly resistance, difficulty in insertion, and easy falling off of the soft materials under squeezing and friction may occur, and even local damage to the aluminum-plastic film may occur, thereby reducing the assembly efficiency and long-term reliability of the soft-pack battery cell. Utility Model Content

[0004] This application provides a battery pack to improve vibration reduction and anti-fretting performance and reduce abnormal noise, while reducing the risk of local pressure damage to the aluminum-plastic film, thereby improving overall assembly efficiency and long-term reliability.

[0005] A battery pack includes a cell box and pouch cells installed in the cell box. The battery pack also includes a support member installed between the cell box and the pouch cells. The support member covers at least two sides of the pouch cells and abuts against the inner wall of the cell box.

[0006] In some possible implementations, the cell box is provided with an opening for inserting the pouch cell, the pouch cell including a top surface, a bottom surface opposite the top surface, and a plurality of side surfaces located between the top surface and the bottom surface, the bottom surface being exposed in the opening, the top surface having a corner between the top surface and the plurality of side surfaces, the support member covering at least one of the corners, a portion of the support member being located on the top surface, and a portion of the support member being located on the side surfaces.

[0007] In some possible implementations, the pouch cell includes two sides, with a portion of the support located on the top surface and another portion of the support located on each of the two sides.

[0008] In some possible implementations, there is a first gap between the top surface and the inner wall of the battery cell box, and a second gap between the side surface and the inner wall of the battery cell box. The thickness of the first gap is the same as the thickness of the second gap, and the thickness of the first gap is less than the thickness of the support member.

[0009] In some possible implementations, the thickness of the first gap is 80% to 97% of the thickness of the support member.

[0010] In some possible implementations, the length of the top surface and the sum of the lengths of the plurality of side surfaces are greater than the length of the support member.

[0011] In some possible implementations, an elastic element is provided between each pair of adjacent pouch cells, with the opposite ends of the elastic element connected to the support element.

[0012] In some possible implementations, the elastic element and the support element are made of silicone or foam, and the hardness of the elastic element and the support element is HC50-90.

[0013] In some possible implementations, the support is connected to the inner wall of the pouch cell and / or the cell box by an adhesive.

[0014] In some possible implementations, the support is segmented with gaps between adjacent segments, the gaps being used to release the deformation stress generated by the battery cell when it is compressed or expanded.

[0015] In this application, by setting a support between the cell box and the soft-pack cell, and ensuring that it at least covers the top surface and adjacent side surfaces of the cell, and using an arc-shaped transition layer with gradually changing thickness at the corners, the sharp-angle contact and geometric abrupt change are transformed into smooth introduction and continuous force. This significantly reduces insertion resistance and peeling / jamming at the corners, suppresses sharp corner accumulation and stress concentration, and reduces the displacement or falling of the support. At the same time, a continuous damping path and a larger effective contact area are established in the "top surface-corner-side surface" to make the pre-tightening more uniform and more tolerant of dimensional tolerances, thereby improving vibration reduction and anti-fretting performance and reducing abnormal noise. It can also reduce the risk of local pressure damage to the aluminum-plastic film and improve the overall assembly efficiency and long-term reliability. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a battery pack according to an embodiment of this application; Figure 2 for Figure 1 The diagram shows the disassembly of the battery pack; Figure 3 for Figure 2 The diagram shows the structure of the soft-pack battery cells and supporting components of the battery pack. Figure 4 for Figure 3 The diagram shown depicts the soft-pack battery cell, support components, and battery cell box before assembly. Figure 5 The diagram shows a cross-sectional view of the soft-pack battery cell, support components, and battery cell box after assembly, as shown in Figure 4.

[0018] Explanation of key component symbols: 100: Battery pack; 101: Housing; 101a: First housing; 101b: Second housing; 101c: Accommodation space; 102: Circuit board; 103: Insert plate; 110: Cell box; 120: Soft-pack cell; 130: Support component; 132: Arc transition layer; 136: Adhesive layer; 200: Stacking module; 300: Elastic component; 500: Opening; 510: Top surface; 520: Bottom surface; 530: Side surface; 540: Corner; 550: First gap; 560: Second gap; First direction: X; Second direction: Z; Third direction: Y.

[0019] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0020] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only one embodiment of the bracket in this application, and not all embodiments.

[0021] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. When a component is said to be "set on" another component, it can be directly set on the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0022] like Figure 1 and Figure 2 As shown, one embodiment of this application provides a battery pack 100, including a housing 101, a cell box 110 mounted on the housing 101, a pouch cell 120, a support member 130, and a circuit board 102 and an insert plate 103 connected to the pouch cell 120. The cell box 110, the pouch cell 120, the support member 130, the circuit board 102, and the insert plate 103 are assembled into a cell assembly, and the cell assembly outputs and / or inputs electrical energy.

[0023] The housing 101 has a first housing 101a and a second housing 101b. The first housing 101a and the second housing 101b surround and form an accommodating space 101c. The battery pack 100's cell box 110, soft-pack cell 120, support member 130, circuit board 102 and insert member 103 are all installed in the accommodating space 101c, forming reliable physical protection and structural support.

[0024] The soft-pack battery cell 120 is located inside the battery cell box 110 and can be composed of multiple cells stacked in a certain direction. The rated voltage of a single cell is 4V, and a total output voltage of 20V is achieved through series connection. It has high energy density and stable discharge performance.

[0025] The circuit board 102 is installed between the cell box 110 and the first housing 101a to realize the battery management, charge and discharge control, temperature monitoring and communication protection functions of the battery pack, thereby improving the overall safety and reliability of use.

[0026] The insert plate 103 is disposed at the end or side of the cell box 110 for electrically connecting the tabs of the soft-pack cell 120, and at the same time assisting in the positioning and fixing of the electrical connection.

[0027] Please see Figure 3 , Figure 4 as well as Figure 5 A support member 130 is disposed between the cell box 110 and the pouch cell 120. One side of the support member 130 covers at least two sides of the pouch cell 120, preferably the top surface 510 and at least one adjacent side surface 530. The support member 130 has a gradual thickness transition at the corner 540 between the top surface 510 and the side surface 530, forming an arc transition layer 132 to reduce sharp corner buildup. The other side of the support member 130 abuts against the inner wall of the cell box 110. By providing an arc transition layer 132 at the corner 540, the support member 130 has a smooth curvature along the transition path of "top surface 510 - corner 540 - side surface 530", reducing the buildup and stress concentration effects caused by geometric abrupt changes from the source.

[0028] Among them, "sharp corner accumulation" refers to the phenomenon that when the support 130 is inserted across the path of "top surface 510 - corner 540 - side surface 530", if the corner is an acute angle or the thickness changes abruptly, the support 130 will locally accumulate, wrinkle and thickness superposition at the corner 540. Understandably, if sharp corner accumulation exists, its disadvantages include but are not limited to: (1) sudden increase in thickness and stress concentration: the local compression in the area near the corner 540 is significantly higher than that in the straight area, resulting in uneven contact stress; (2) unbalanced fit: the effective fit area of ​​the top surface 510 or the side surface 530 is occupied by wrinkles, resulting in uneven gap and micro-movement; (3) increased interface risk: local protrusions may cause point pressure or scratch risk to the outer film of the soft-pack battery cell 120, while weakening the continuity and long-term stability of the adhesive layer; (4) deterioration of vibration reduction performance: the material accumulation forms "hard points", which induce energy to accumulate at the corner 540 under vibration conditions, which is not conducive to overall vibration isolation.

[0029] In this embodiment, the cell box 110 is generally square-shaped and has an opening 500. A pouch cell 120 is inserted into the cell box 110 through the opening 500 along the first direction X. After the pouch cell 120 is inserted into the cell box 110, its bottom surface 520 is exposed through the opening 500 for easy insertion and positioning. For example, one side of the cell box 110 with opening 500 can be connected to a circuit board (not labeled), and the pouch cell 120 exposed through opening 500 can be easily electrically connected to the circuit board (not labeled). For ease of description, the length direction of the pouch cell 120 is defined as the second direction Z, and the width direction as the third direction Y, wherein the first direction X, the second direction Z, and the third direction Y are all perpendicular to each other.

[0030] In some embodiments (such as) Figures 2-3 As shown in the diagram, viewed in a Z-Y section perpendicular to the first direction X, a first gap 550 is provided between the top surface 510 of the battery cell and the inner wall of the battery cell box 110, and a second gap 560 is provided between the side surface 530 of the battery cell and the inner wall of the battery cell box 110. The first gap 550 and the second gap 560 have the same thickness, and both are less than the thickness of the support member 130; furthermore, the thickness of the first gap 550 is 80% to 97% of the thickness of the support member 130.

[0031] During assembly, the support 130 is elastically bent by the inner wall of the battery cell box 110 during insertion. After installation, a stable and uniform pre-tight fit is formed on the top surface 510 and the side surface 530. This pre-tightness can compensate for dimensional tolerances and maintain the consistency of the equal thickness gap strategy. It can also form a continuous damping path at the corner 540 with the arc transition layer 132 to improve vibration reduction and impact resistance. At the same time, it can suppress micro-slippage and abnormal noise caused by temperature, humidity and circulation.

[0032] In some embodiments, for a stacked module 200 of multiple pouch cells 120, i.e., multiple pouch cells 120 are stacked along a first direction X to form a stacked module 200, an elastic member 300 is provided between every two adjacent pouch cells 120. The opposite ends of the elastic member 300 are respectively connected to the support member 130 of the adjacent individual cells, forming a flexible coupling across the cells in a three-dimensional path. Specifically, the relative displacement of adjacent pouch cells 120 is suppressed along the first direction X, enhancing the integrity and stability of the stacked module 200; the elastic member 300 deforms and absorbs energy under impact or vibration, and works in conjunction with the pre-tightening fit of the support member 130 to form a multi-path energy dissipation network.

[0033] In some embodiments, the support member 130 and the elastic member 300 may be made of silicone or foam material, preferably with a Shore C (HC) hardness of 50-90, achieving a balance between cushioning and vibration reduction and ease of assembly. The support member 130 can be reliably connected to the inner wall of the soft-pack battery cell 120 and / or the battery cell box 110 via an adhesive layer; the adhesive may be pressure-sensitive or structural, selected based on requirements for temperature resistance, aging resistance, and dielectric properties. The adhesive layer may be provided on one or both sides and may include release paper (unlabeled) for assembly cycle control.

[0034] In some embodiments, the support member 130 may be segmented along the second direction Z (length direction), with gaps forming between adjacent segments. These gaps are used to release the deformation stress of the pouch cell 120 under compression or expansion, preventing excessive peak stress on the inner wall of the cell housing 110. The size and distribution of the gaps can be designed according to the cell size, assembly preload, and cyclic expansion characteristics to ensure uniform preload and prevent instability throughout its lifespan. Furthermore, the connection between the elastic member 300 and the support member 130 helps maintain the relative positioning of adjacent support members 130 in the first direction X, the second direction Z, and the third direction Y.

[0035] In some embodiments, the support member 130 can be a die-cut foam sheet, an extruded silicone strip, or a laminated composite. While ensuring equal thickness gaps and preload, the unfolded length of the support member 130 is less than the sum of the lengths of the top surface 510 and multiple side surfaces 530, to ensure smooth bending at corners 540 during assembly without tearing. For areas spanning corners, a rounded transition layer 132 can be prefabricated on the support member 130 blank or formed directly during die forming to improve assembly consistency and reduce the risk of sharp corner buildup.

[0036] Compared with the prior art, the battery pack 100 provided in this application has the following advantages: (i) The combination of the arc transition layer 132 and the equal thickness gap strategy significantly reduces the accumulation of sharp corners and stress concentration at the corner 540, and improves the stability and durability of the interface between the outer coating and the adhesive layer of the soft-pack battery cell 120.

[0037] (ii) Both the first gap 550 and the second gap 560 are less than the thickness of the support 130. After assembly, they form a stable and uniform pre-tight fit, taking into account both dimensional tolerance compensation and anti-fretting ability under vibration conditions. The assembly cycle is friendly and highly repeatable.

[0038] (iii) By using the flexible coupling of the elastic element 300 with the adjacent support element 130 in the first direction X, an energy dissipation path across the battery cell is constructed, which suppresses relative displacement and misalignment, and improves the vibration resistance and overall stability of the stacked module 200.

[0039] An embodiment of this application also provides a method for assembling a battery pack 100, comprising the following steps: S1: Please see Figure 1 The system provides a cell box 110 with an opening 500 and a stacking module 200, and cleans the inner wall of the cell box 110 and the outer surface of the pouch cell 120. The stacking module 200 includes a plurality of pouch cells 120 stacked along a first direction X, and an elastic member 300 is provided between each two adjacent pouch cells 120.

[0040] S2: Cut the support component 130 according to the design, and prefabricate the arc transition layer 132 in the corner area.

[0041] S3: An adhesive layer is provided on one or both sides of the support 130, and the support 130 is positioned on one side of the stacked module 200 so that it can span the top surface 510 and the side surface 530 of the soft-pack cell 120 during insertion.

[0042] S4: Please see Figure 2 and Figure 3 The stacked module 200 is inserted into the cell box 110 along the opening 500 direction. The support member 130 is elastically bent by the inner wall of the cell box 110 and automatically covers the target surface, achieving pre-tight fit between the top surface 510 and the side surface 530. After positioning, the release paper (unlabeled) can be removed and compacted. During this process, both ends of the elastic member 300 are connected to the support member 130 of the adjacent cell, forming a flexible coupling across the cell.

[0043] S5: Perform routine verification of items such as appearance inspection, dimensions, preload, insulation, and vibration reliability.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

Claims

1. A battery pack, comprising a cell box and pouch cells mounted within the cell box, the cell box supporting the pouch cells, the pouch cells being configured to output and / or input electrical energy; characterized in that: The battery pack also includes a support member installed between the cell box and the pouch cell, the support member covering at least two sides of the pouch cell and abutting against the inner wall of the cell box.

2. The battery pack as described in claim 1, characterized in that: The cell box is provided with an opening for inserting the pouch cell. The pouch cell includes a top surface, a bottom surface opposite to the top surface, and a plurality of side surfaces located between the top surface and the bottom surface. The bottom surface is exposed in the opening. There is a corner between the top surface and the plurality of side surfaces. The support member covers one of the corners. At least a portion of the support member is located on the top surface, and at least a portion of the support member is located on the side surface.

3. The battery pack as described in claim 2, characterized in that, The pouch cell includes two sides, with part of the support member located on the top surface and the other part of the support member located on the two sides respectively.

4. The battery pack as described in claim 2, characterized in that: There is a first gap between the top surface and the inner wall of the battery cell box, and there is a second gap between the side surface and the inner wall of the battery cell box. The thickness of the first gap is the same as the thickness of the second gap, and the thickness of the first gap is less than the thickness of the support member.

5. The battery pack as described in claim 4, characterized in that: The thickness of the first gap is 80% to 97% of the thickness of the support member.

6. The battery pack as described in claim 2, characterized in that: The length of the top surface and the sum of the lengths of the plurality of sides are greater than the length of the support member.

7. The battery pack as described in claim 6, characterized in that: An elastic element is provided between each pair of adjacent pouch cells, and the opposite ends of the elastic element are respectively connected to the support element.

8. The battery pack as described in claim 7, characterized in that: The elastic element and the support element are made of silicone or foam, and the hardness of the elastic element and the support element is HC50-90.

9. The battery pack as described in claim 2, characterized in that: The support is connected to the inner wall of the pouch cell and / or the cell box by an adhesive.

10. The battery pack as described in claim 2, characterized in that: The support is segmented with gaps between adjacent segments. These gaps are used to release the deformation stress generated when the battery cell is compressed or expanded.

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