Battery pack

Abstract

The utility model discloses a battery pack which comprises a shell, heat dissipation assemblies and a plurality of battery cells, the battery cells are arranged in the shell, a heat dissipation assembly is arranged between each battery cell and the shell, and the heat dissipation assemblies are used for conducting heat generated by the battery cells to the shell. First heat dissipation ribs and second heat dissipation ribs are arranged in the shell, the first heat dissipation ribs are arranged at intervals in the length direction of the shell, and the second heat dissipation ribs are arranged at intervals in the width direction of the shell, so that the internal space of the shell is divided into a plurality of containing cavities; the battery cell and the heat dissipation assembly are arranged in the containing cavity, and the heat dissipation assembly abuts against the first heat dissipation ribs and / or the second heat dissipation ribs. According to the battery pack, the heat dissipation assembly is arranged between each battery cell in the battery pack and the shell, so that heat generated by each battery cell is conducted to the shell, rapid heat dissipation of the battery cells is promoted, and the cycle life of the battery pack is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of batteries, and in particular to a battery pack. Background Art

[0002] In existing technologies, soft-pack batteries, due to their inherent inability to withstand high-rate discharge, are typically not designed with specialized heat dissipation features. Instead, they typically employ a glue potting process, whereby heat generated by the soft-pack batteries is transferred to a metal heat sink via thermally conductive adhesive. For battery packs with multiple series and parallel connections, the long heat transfer path and relatively low thermal conductivity of the thermally conductive adhesive prevent effective heat transfer from the interior to the exterior of the battery. This can easily lead to higher temperatures in the central cells due to heat accumulation, creating a significant temperature difference with the surrounding cells. This uneven temperature distribution accelerates battery aging, shortens the overall cycle life of the battery pack, and also reduces mechanical strength. Utility Model Content

[0003] The embodiment of the present invention provides a battery pack to solve the problem of the lack of heat dissipation design in existing soft-pack batteries, thereby achieving the effects of rapid heat dissipation and extending the cycle life of the battery pack.

[0004] Specifically, the utility model provides a battery pack, including a shell, a heat dissipation assembly and multiple battery cells, the battery cells are arranged in the shell, and a heat dissipation assembly is arranged between each battery cell and the shell, and the heat dissipation assembly is used to conduct the heat generated by the battery cells to the shell.

[0005] Optionally, the shell includes a first heat dissipation rib and a second heat dissipation rib, wherein the first heat dissipation rib is arranged at intervals along the length direction of the shell, and the second heat dissipation rib is arranged at intervals along the width direction of the shell, so as to divide the internal space of the shell into multiple accommodating cavities; the battery cell and the heat dissipation assembly are arranged in the accommodating cavity, and the heat dissipation assembly is in contact with the first heat dissipation rib and / or the second heat dissipation rib.

[0006] Optionally, the heat dissipation assembly includes at least one heat dissipation sleeve, which is arranged in the accommodating cavity and abuts against the bottom wall of the outer shell, the side wall of the outer shell, the first heat dissipation rib and / or the second heat dissipation rib; each of the heat dissipation sleeves accommodates one or two of the battery cells, and the battery cells abut against the inner wall of the heat dissipation sleeve.

[0007] Optionally, each heat dissipation sleeve contains two battery cells, the two battery cells are stacked along the thickness direction, and the two battery cells are bonded together.

[0008] Optionally, the heat dissipation sleeve is a thermally conductive silicone sleeve.

[0009] Optionally, the heat dissipation component includes a thermally conductive silicone block, which is filled between the battery core and the inner wall of the accommodating cavity.

[0010] Optionally, the outer shell includes a shell, a bracket and a cover, and an opening is provided at one end of the shell; the battery cell, the first heat dissipation rib and the second heat dissipation rib are all arranged in the shell; the bracket covers the opening, and a through hole is provided on the bracket, and the electrode ear of the battery cell extends out of the shell through the through hole; the cover covers the bracket to seal the shell.

[0011] Optionally, the battery pack further includes a collection board and a function board, wherein the collection board is disposed between the bracket and the cover, and the collection board is electrically connected to the tab of each battery cell;

[0012] The function board is arranged between the acquisition board and the cover body, the function board is electrically connected to the acquisition board, and the wires on the function board extend out of the cover body.

[0013] Optionally, the battery pack further includes a flame-retardant gasket, which is disposed between the acquisition board and the functional board to prevent the battery cell from conducting heat to the functional board.

[0014] Optionally, the shell is made of aluminum; and / or the flame retardant gasket is made of polycarbonate.

[0015] The beneficial effects of the present invention are:

[0016] In the battery pack provided by the present invention, since a heat dissipation component is provided between each battery cell in the battery pack and the outer shell, the heat generated by each battery cell is conducted to the outer shell, promoting rapid heat dissipation of the battery cell and extending the cycle life of the battery pack.

[0017] Furthermore, the provision of the first and second heat dissipating ribs increases the heat transfer path between each battery cell and the housing, further improving heat dissipation efficiency. Furthermore, the first and second heat dissipating ribs provide support within the housing, increasing the mechanical strength of the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 This is a schematic partial structural diagram of a battery pack in one embodiment of the present invention;

[0020] Figure 2 This is a schematic partial structural diagram of a battery pack in one embodiment of the present invention;

[0021] Figure 3 This is a schematic installation process of the battery pack in one embodiment of the utility model Figure 1 ;

[0022] Figure 4 This is a schematic installation process of the battery pack in one embodiment of the utility model Figure 2 ;

[0023] Figure 5 This is a schematic installation process of the battery pack in one embodiment of the utility model Figure 3 ;

[0024] Figure 6 This is a schematic installation process of the battery pack in one embodiment of the utility model Figure 4 ;

[0025] Figure 7 This is a schematic installation process of the battery pack in one embodiment of the utility model Figure 5 ;

[0026] Figure 8 This is a schematic installation process of the battery pack in one embodiment of the utility model Figure 6 ;

[0027] Figure 9 This is a schematic installation process of the battery pack in one embodiment of the utility model Figure 7 ;

[0028] Figure 10 This is a schematic installation process of the battery pack in one embodiment of the utility model Figure 8 .

[0029] In the figure: 100, outer shell, 110, shell, 111, first heat dissipation rib, 112, second heat dissipation rib, 120, bracket, 121, through hole, 130, cover, 200, heat dissipation component, 210, heat dissipation sleeve, 300, battery cell, 310, tab, 400, collection board, 500, functional board, 510, wire, 600, flame retardant gasket, 700, double-sided foam tape. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0031] In the description of the present invention, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0032] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary, such as by glue injection between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0033] Figure 1 This is a schematic partial structural diagram of a battery pack in one embodiment of the present invention. Figure 1 As shown, and reference Figures 2 to 10 The present invention provides a battery pack, comprising a housing 100, a heat dissipation assembly 200 and a plurality of battery cells 300. The battery cells 300 are disposed in the housing 100. A heat dissipation assembly 200 is disposed between each of the battery cells 300 and the housing 100. The heat dissipation assembly 200 is used to conduct the heat generated by the battery cells 300 to the housing 100. Figure 2 As shown, a first heat dissipation rib 112 and a second heat dissipation rib 112 are provided in the shell 100, the first heat dissipation rib 111 is arranged at intervals along the length direction of the shell 100, and the second heat dissipation rib 112 is arranged at intervals along the width direction of the shell 100, so as to divide the internal space of the shell 100 into multiple accommodating cavities; the battery cell 300 and the heat dissipation assembly 200 are arranged in the accommodating cavity, and the heat dissipation assembly 200 is in contact with the first heat dissipation rib 111 and / or the second heat dissipation rib 112.

[0034] In this embodiment of the present invention, since a heat dissipation assembly 200 is provided between each battery cell 300 and the outer casing 100 within the battery pack, the heat generated by each battery cell 300 is transferred to the outer casing 100, helping the battery cells 300 to dissipate heat quickly and extending the cycle life of the battery pack. Furthermore, the provision of the first and second heat dissipation ribs 111, 112 increases the heat transfer path between each battery cell 300 and the outer casing 100, further improving heat dissipation efficiency. Furthermore, the first and second heat dissipation ribs 111, 112 provide support within the outer casing 100, increasing the mechanical strength of the outer casing 100.

[0035] In one embodiment of the present invention, Figure 3 、 Figure 4 As shown, the heat dissipation assembly 200 includes at least one heat dissipation sleeve 210, which is arranged in the accommodating cavity and abuts against the bottom wall of the outer shell 100, the side wall of the outer shell 100, the first heat dissipation rib 111 and / or the second heat dissipation rib 112; each of the heat dissipation sleeves 210 accommodates one or two of the battery cells 300, and the battery cells 300 abut against the inner wall of the heat dissipation sleeve 210.

[0036] The setting of the heat dissipation sleeve 210 can not only protect the battery cells 300 from direct contact with the shell 100 and reduce the risk of short circuit, but also conduct the temperature of the battery cells 300 to the aluminum shell, ensuring that the temperature of all battery cells 300 is maintained at the same level, reducing heat accumulation, and thus meeting high-power charging and discharging requirements.

[0037] In one embodiment of the present invention, each heat dissipation sleeve 210 houses two battery cells 300. The two battery cells 300 are stacked along the thickness of the sleeve and bonded together using double-sided foam tape 700. Placing two battery cells 300 within a single heat dissipation sleeve 210 not only increases the proportion of battery cells 300 in the battery pack, thereby increasing the energy density of the battery pack, but also ensures that a larger side surface of each battery cell 300 abuts the inner wall of the heat dissipation sleeve 210 for rapid heat dissipation.

[0038] Furthermore, the heat dissipation sleeve 210 is a thermally conductive silicone sleeve, and the thermal conductivity of the thermally conductive silicone is ≥1.5 W / (m•K), which can quickly conduct the heat generated by the battery cell 300 to the shell 100, the first heat dissipation rib 111 or the second heat dissipation rib 112; and the thermally conductive silicone itself has excellent flame retardant properties. When the battery cell 300 thermally runs away and catches fire, the heat dissipation sleeve 210 can prevent the flame from being transferred to other battery cells 300, effectively preventing a single battery cell 300 from catching fire and causing thermal runaway / combustion of the entire battery pack.

[0039] In an alternative embodiment of the present invention, the heat dissipation assembly 200 includes a thermally conductive silicone block, which is filled between the battery cell 300 and the inner wall of the housing cavity. The thermally conductive silicone block has a high thermal conductivity, which not only stabilizes the battery cell 300 and provides a buffer, but also quickly transfers heat from the internal battery cell 300 to the exterior of the housing 100, achieving a heat dissipation design for the battery pack.

[0040] In one embodiment of the present invention, Figure 9 、 Figure 10 As shown, the housing 100 includes a shell 110, a bracket 120, and a cover 130. The shell 110 has an opening at one end. The battery cell 300, the first heat dissipation rib 111, and the second heat dissipation rib 112 are all disposed within the shell 110. The bracket 120 covers the opening and has a through-hole 121 formed in the bracket 120. The tab 310 of the battery cell 300 extends out of the shell 110 through the through-hole 121. The cover 130 covers the bracket 120 to seal the shell 110. The bracket 120 is disposed between the shell 110 and the cover 130 to facilitate securing / restraining the battery cell 300 and to reserve space between the bracket 120 and the cover 130 for mounting other components.

[0041] Furthermore, the housing 110, the first heat dissipation ribs 111, and the second heat dissipation ribs 112 are made of aluminum and are integrally formed. Since the housing 110, the first heat dissipation ribs 111, and the second heat dissipation ribs 112 are made of aluminum, they have the characteristics of fast heat dissipation and high mechanical strength, and are relatively safe when used.

[0042] In one embodiment of the present invention, Figure 7 、 Figure 9 As shown, the battery pack also includes a collection board 400 and a function board 500. The collection board 400 is disposed between the bracket 120 and the cover 130 and is electrically connected to the tab 310 of each battery cell 300. The function board 500 is disposed between the collection board 400 and the cover 130 and is electrically connected to the collection board 400. The wires 510 on the function board 500 extend out of the cover 130. Because multiple battery cells 300 are disposed within each housing 110, the circuit design on the collection board 400 allows the tabs 310 of multiple battery cells 300 to be welded to the collection board 400 to achieve a series and / or parallel connection, resulting in a finished battery pack with multiple series and parallel connections.

[0043] In one embodiment of the present invention, Figure 8As shown, the battery pack further includes a flame retardant gasket 600, which is disposed between the acquisition board 400 and the functional board 500 to prevent the battery cell 300 from conducting heat to the functional board 500; further, the flame retardant gasket 600 is made of polycarbonate.

[0044] The following is combined with Figure 3-10 The following describes a method for installing a battery pack according to an embodiment of the present invention. The method includes the following steps:

[0045] Step 1: If Figure 3 、 Figure 4 As shown, two single battery cells 300 are bonded together by double-sided foam tape 700 and placed in a heat dissipation sleeve 210 made of thermally conductive silicone material to form the required parallel battery cell 300 module.

[0046] Step 2: If Figure 5-Figure 8 As shown, the parallel battery cell 300 module is assembled into the aluminum shell 110 according to the series / parallel requirements, covered with a plastic bracket 120, and the shell 110 and the bracket 120 are fixed with screws; then the collection board 400 is welded to the tab 310 of the battery cell 300, and after welding, a flame retardant gasket 600 made of PC material is attached to the collection board 400.

[0047] Step 3: If Figure 9 、 Figure 10 As shown, the function board 500 is installed on the flame retardant gasket 600, and the function board 500 is electrically connected to the collection board 400; then the cover 130 is covered, and the cover 130 and the bracket 120 are fixed by screws to obtain a finished battery pack.

[0048] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. A battery pack, characterized in that: The invention comprises a housing (100), a heat dissipation assembly (200), and a plurality of battery cells (300), wherein the battery cells (300) are arranged in the housing (100), a heat dissipation assembly (200) is provided between each of the battery cells (300) and the housing (100), and the heat dissipation assembly (200) is used to conduct heat generated by the battery cells (300) to the housing (100); A first heat dissipation rib (111) and a second heat dissipation rib (112) are provided in the housing (100); the first heat dissipation rib (111) is arranged at intervals along the length direction of the housing (100), and the second heat dissipation rib (112) is arranged at intervals along the width direction of the housing (100), so as to divide the internal space of the housing (100) into a plurality of accommodating cavities; the battery cell (300) and the heat dissipation assembly (200) are arranged in the accommodating cavities, and the heat dissipation assembly (200) abuts against the first heat dissipation rib (111) and / or the second heat dissipation rib (112).

2. The battery pack according to claim 1, wherein: The heat dissipation assembly (200) comprises at least one heat dissipation sleeve (210), the heat dissipation sleeve (210) being arranged in the accommodating cavity and abutting against the bottom wall of the housing (100), the side wall of the housing (100), the first heat dissipation rib (111) and / or the second heat dissipation rib (112); each heat dissipation sleeve (210) accommodates one or two battery cells (300), and the battery cells (300) abut against the inner wall of the heat dissipation sleeve (210).

3. The battery pack according to claim 2, wherein: Each heat dissipation sleeve (210) contains two battery cores (300), the two battery cores (300) are stacked along the thickness direction thereof, and the two battery cores (300) are bonded to each other.

4. The battery pack according to claim 2, wherein: The heat dissipation sleeve (210) is a heat-conducting silicone sleeve.

5. The battery pack according to claim 1, wherein: The heat dissipation component (200) comprises a heat-conducting silica gel block, and the heat-conducting silica gel block is filled between the battery core (300) and the inner wall of the accommodating cavity.

6. The battery pack according to claim 1, wherein: The housing (100) comprises a shell (110), a bracket (120) and a cover (130); an opening is provided at one end of the shell (110); the battery cell (300), the first heat dissipation rib (111) and the second heat dissipation rib (112) are all arranged in the shell (110); the bracket (120) covers the opening; a through hole (121) is provided on the bracket (120); a tab (310) of the battery cell (300) passes through the through hole (121) and extends out of the shell (110); the cover (130) covers the bracket (120) to seal the shell (110).

7. The battery pack according to claim 6, characterized in that: The battery pack further comprises a collection board (400) and a function board (500), wherein the collection board (400) is arranged between the bracket (120) and the cover (130), and the collection board (400) is electrically connected to the tab (310) of each battery cell (300); The function board (500) is arranged between the acquisition board (400) and the cover (130), the function board (500) is electrically connected to the acquisition board (400), and the wire (510) on the function board (500) extends out of the cover (130).

8. The battery pack according to claim 7, characterized in that: The battery pack further comprises a flame retardant gasket (600), which is arranged between the collection board (400) and the functional board (500) to prevent the battery core (300) from conducting heat to the functional board (500).

9. The battery pack according to claim 8, characterized in that: The housing (110) is made of aluminum; and / or the flame retardant gasket (600) is made of polycarbonate.

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