Battery pack and electric vehicle

Abstract

The battery pack comprises a battery shell, a battery cell group, a fixing assembly and glue, the battery shell extends along a first direction, and a placing space is arranged in the battery shell. The battery cell group is arranged in the placing space and comprises a plurality of battery cells which are sequentially arranged along the second direction, and each battery cell extends along the third direction; the fixing assembly comprises an insulating part, and the insulating part is laid at the bottom of the placing space and is used for bearing the battery cell group. The insulating part comprises a plurality of glue grooves which are arranged at intervals in the third direction, and each glue groove extends in the second direction and is arranged in the first direction in a penetrating mode. The glue is filled in the plurality of glue grooves, the volume of the glue filled in each glue groove is equal to that of the glue groove, and the glue is used for bonding and fixing the plurality of battery cells and the battery shell. The gluing position and the glue amount are defined through the insulating part provided with a plurality of glue grooves, so that the battery cell fixing stability is ensured, and the structure fixing and glue using cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery pack module technical field, concretely relates to a battery pack and electric vehicle. BACKGROUND

[0002] In the electric vehicle industry, the fixed structure form of the battery pack is often in the form of a module, that is, the battery pack is assembled into a module and then the module is placed in the shell, and enterprises use glue to fix it in order to reduce costs, but the amount of glue in the glue coating process is not easy to accurately control, and the push-off form of the glue is uncontrollable, if multiple glue is used to ensure the coverage area of the glue, the different glue thickness will affect the welding of the battery pack after stacking in the shell, and the actual amount of glue is too large, which will increase the cost. If the battery pack and the shell are directly bonded, the insulation and voltage resistance safety requirements of the battery pack and the shell depend on the glue, but due to the uncertainty of the glue layer thickness and the coating area, there is a risk of insulation and voltage resistance failure between the battery pack and the shell, which affects the safety of the battery pack. SUMMARY

[0003] In order to overcome the above-mentioned shortcomings, the purpose of the utility model is to provide a battery pack and an electric vehicle to solve the problems of the battery pack assembly and the overall structural strength caused by the above-mentioned background technology, and the amount of glue in the glue coating process is not easy to accurately control.

[0004] In order to achieve the above purpose, the utility model adopts the technical scheme of a battery pack, which comprises:

[0005] The battery shell extends along the first direction and has a placing space inside.

[0006] The battery pack is arranged in the placing space and comprises a plurality of battery cells arranged along the second direction.

[0007] The fixing assembly comprises an insulating part, which is arranged on the bottom of the placing space and used for bearing the battery pack. The insulating part comprises a plurality of glue grooves, which are arranged along the third direction. Each glue groove extends along the second direction and is arranged through along the first direction.

[0008] The glue is filled in the plurality of glue grooves, and the volume of the glue filled in each glue groove is equal to the volume of the glue groove. The glue is used for bonding and fixing the plurality of battery cells and the battery shell, and the first direction, the third direction and the second direction are perpendicular to each other.

[0009] The battery pack provided by the utility model, the insulating piece is provided with a plurality of glue grooves, and glue is coated at the glue grooves to bond the battery cell and the battery shell, the position of the plurality of glue grooves is adjusted to correspondingly adjust the glue distribution position and the glue amount, so that different guarantee that each battery cell is segmentedly covered with glue is met, and the bonding strength is further ensured, and meanwhile, since the insulating piece is made of insulating material, the insulation of the battery cell and the shell in the non-opening area is ensured to a certain extent.

[0010] In some embodiments, the insulating piece is one of an insulating sheet or an insulating plate, and the thickness of the insulating piece is 0.5mm-2mm.

[0011] By adjusting the thickness of the insulating piece, the bottom glue coating thickness is ensured to meet the bonding strength, so that each battery cell can be bonded with the battery shell.

[0012] In some embodiments, the fixing assembly further comprises a support plate and a plurality of upper cover support ribs, the support plate extends along the third direction and is arranged at the top of the battery cell group, and the plurality of upper cover support ribs are arranged at intervals along the second direction, each upper cover support rib comprises a bottom plate and two end plates, the bottom plate extends along the third direction and is arranged at the top of the support plate, and the two end plates are arranged at the two ends of the bottom plate along the third direction, and the ends of the two end plates are arranged in opposite directions along the third direction.

[0013] By the above technical solution, the bottom of the battery cell group and the lower shell part of the battery shell are fixed by the bottom adhesive, and the upper part of the battery cell is fixed by the support structure of the support plate and the plurality of upper cover support ribs and the upper shell part of the battery shell, so that the battery cell group is fixed in the battery shell.

[0014] In some embodiments, the fixing assembly further comprises a pressing tool, the plurality of upper cover support ribs and the battery shell cooperatively define a limiting space extending along the second direction, and the pressing tool is arranged in the limiting space and used for pressing the battery cell group by the pressing tool.

[0015] By the above technical solution, the pressing tool is arranged in the limiting space at the top of the battery cell group, so that the bonding is ensured to be firm by the weight of the battery cell and the pressing tool during the fixing.

[0016] In some embodiments, the fixing assembly further comprises a baffle assembly arranged in the placement space, including a first baffle, a second baffle, a first side plate and a second side plate. The first baffle and the second baffle both extend along the first direction and are symmetrically arranged on both sides of the battery cell group along the second direction. The first side plate and the second side plate both extend along the second direction and are symmetrically arranged on both sides of the battery cell group along the third direction, for isolating the battery cell group from the battery shell through the baffle assembly.

[0017] In some embodiments, the first baffle is provided with a concave area at the bottom on both sides along the third direction, and the second baffle is symmetrically provided with the concave area with the first baffle. The first side plate is arranged in the concave area and is arranged in a bent manner with the concave area, and the second side plate is symmetrically arranged in a bent manner with the first side plate, for clamping and fixing with the first baffle and the second baffle and limiting the battery cell group in the third direction.

[0018] By using the above technical scheme, the bent arrangement of the first side plate and the second side plate can be positioned and installed in correspondence with the first baffle and the second baffle, and the bent arrangement of the first side plate and the second side plate can limit the battery cell group in the third direction, preventing the battery cell group from moving inside the battery pack and affecting the safety of the product.

[0019] In some embodiments, the materials of the first baffle, the second baffle, the first side plate and the second side plate are all polypropylene.

[0020] By using the above technical scheme, the PP material has the characteristics of fireproof, waterproof, high temperature resistant, chemical corrosion resistant and wear resistant, and is therefore suitable for the material of the baffle assembly in the present scheme.

[0021] In some embodiments, an electric vehicle comprises a battery pack as described in the above embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 A perspective view of an embodiment of the battery pack of the present application Figure 1 ;

[0023] Figure 2 A perspective view of an embodiment of the battery pack of the present application Figure 2 , wherein the battery shell is not shown;

[0024] Figure 3 A perspective view of an embodiment of the battery pack of the present application Figure 3 , wherein the top part of the battery shell is not shown;

[0025] Figure 4A structure diagram of an insulating part of one embodiment of the battery pack of the utility model;

[0026] In the drawing,

[0027] 1, battery pack; 2, battery shell; 20, placement space; 3, battery cell group; 30, battery cell; 4, fixing assembly; 40, insulating part; 400, glue groove; 41, support plate; 42, upper cover support rib; 420, bottom plate; 421, end plate; 43, limiting space; 44, baffle assembly; 45, first baffle; 46, second baffle; 47, first side plate; 48, second side plate; 49, concave area. DETAILED DESCRIPTION

[0028] The advantages and features of the utility model will be more easily understood by the person skilled in the art by the preferred embodiments of the utility model in combination with the drawings, so that the protection scope of the utility model is more clearly defined.

[0029] The advantages and effects of the utility model can be easily understood by the person skilled in the art from the contents disclosed in the specification.

[0030] It should be understood that, in the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship when the utility model product is usually placed, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a specific orientation, a specific orientation and operation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second", "third" and the like are only used for differentiation, and cannot be understood as indicating or implying relative importance. The terms "horizontal", "vertical", "overhanging" and the like do not mean that the parts must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0031] In the description of the utility model, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "setting", "mounting", "connecting", "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0032] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0033] refer to Figures 1 to 4 , Figure 1 A three-dimensional representation of a battery pack 1 provided in an embodiment of the present invention is shown. Figure 1 ; Figure 2 A three-dimensional representation of a battery pack 1 provided in an embodiment of the present invention is shown. Figure 2 The battery casing 2 is not shown. Figure 3 A three-dimensional representation of a battery pack 1 provided in an embodiment of the present invention is shown. Figure 3 The top portion of the battery casing 2 is not shown. Figure 3 This invention provides a schematic diagram of the structure of an insulating component 40 in a battery pack 1.

[0034] like Figures 1 to 4 As shown, the technical solution provided in this application is a battery pack 1, including a battery casing 2, a cell assembly 3, a fixing component 4, and adhesive, wherein the battery casing 2 is along a first direction ( Figure 1 Extending in the Z direction (as shown), it has an internal placement space 20. The battery cell assembly 3 is located within the placement space 20, including multiple cells extending along the second direction (as shown). Figure 1 Multiple battery cells 30 are arranged sequentially in the X direction (as shown in the middle X direction), each battery cell 30 along a third direction (as shown in the middle X direction). Figure 1 (As shown in the Y direction). The fixing component 4 includes an insulating member 40, which is laid at the bottom of the placement space 20 to support the battery cell assembly 3. The insulating member 40 includes a plurality of adhesive grooves 400, which are spaced apart along a third direction. Each adhesive groove 400 extends along a second direction and is continuous along a first direction. Adhesive fills the plurality of adhesive grooves 400, and the volume of adhesive filling each adhesive groove 400 is equal to the volume of the adhesive groove 400, for bonding and fixing the plurality of battery cells 30 and the battery casing 2. The first direction, the third direction, and the second direction are perpendicular to each other.

[0035] The battery pack 1 provided in the application is used to solve the problem of unstable glue state and the problem of uncontrollable glue layer thickness between the battery cell 30 and the shell, and the insulation requirement between the battery cell 30 and the metal shell. An insulating piece 40 is arranged between the bottom of the battery cell group 3 and the battery shell 2. The insulating piece 40 is provided with a plurality of glue grooves 400. Glue is coated at the glue grooves 400 to bond the battery cell 30 and the battery shell 2. The position of the plurality of glue grooves 400 is adjusted to adjust the glue distribution position and the glue amount, so as to ensure that each battery cell 30 is segmentedly covered with glue, thereby ensuring the bonding strength. At the same time, since the insulating piece 40 is made of insulating material, the insulation between the battery cell 30 and the shell in the non-opening area can be ensured to a certain extent. The battery pack 1 provided in the application defines the glue coating position and the glue amount by the insulating piece 40 provided with a plurality of glue grooves 400, thereby ensuring the fixing stability of the battery cell 30 and reducing the structure fixing and glue cost.

[0036] In some embodiments, the insulating piece 40 is one of an insulating sheet or an insulating plate, and the thickness of the insulating piece 40 is 0.5mm-2mm.

[0037] Exemplarily, the thickness of the insulating piece 40 is adjusted to ensure that the bottom glue thickness meets the bonding strength, so that each battery cell 30 can be bonded with the battery shell 2. Specifically, the insulating piece 40 in the present example is an insulating plate with a thickness of 1.8mm.

[0038] In some embodiments, referring to Figures 1 to 4 The fixing assembly 4 further includes a support plate 41 and a plurality of upper cover support ribs 42. The support plate 41 extends along the third direction and is arranged at the top of the battery cell group 3. The plurality of upper cover support ribs 42 are arranged at intervals along the second direction. Each upper cover support rib 42 includes a bottom plate 420 and two end plates 421. The bottom plate 420 extends along the third direction and is arranged at the top of the support plate 41. The two end plates 421 are arranged at the two ends of the bottom plate 420 along the third direction. The ends of the two end plates 421 are arranged by being folded in opposite directions along the third direction, and are used to abut and limit the battery shell 2.

[0039] Exemplarily, the bottom of the battery cell group 3 and the lower shell part of the battery shell 2 are fixed by the form of bottom glue. The upper part of the battery cell 30 is fixed by abutting with the upper shell part of the battery shell 2 through the support structure of the support plate 41 and the plurality of upper cover support ribs 42, so as to fix the battery cell group 3 in the battery shell 2. Specifically, the ends of the end plates 421 are arranged by being folded, which can increase the contact area with the upper shell part of the battery shell 2, so as to enhance the fixing effect.

[0040] In some embodiments, referring to Figures 1 to 4The fixing assembly 4 further comprises a pressing tool. The plurality of upper cover support ribs 42 and the battery shell 2 cooperatively define a limiting space 43 extending in the second direction, and the pressing tool is arranged in the limiting space 43 and used to press the battery cell group 3 downward through the pressing tool.

[0041] Illustratively, the pressing tool belongs to a fixing structure commonly used in the prior art battery pack 1, and is usually composed of a clamp, a bolt and the like, and is used to tightly compress the battery cell group 3 together to ensure the firm connection of the battery cell group 3 and the battery shell 2. In the embodiment, the pressing tool is arranged in the limiting space 43 at the top of the battery cell group 3, and the self-weight of the battery cell 30 and the pressing tool ensures the firm adhesion while fixing.

[0042] In some embodiments, referring to Figures 1 to 4 The fixing assembly 4 further comprises a baffle assembly 44 arranged in the placement space 20 and comprising a first baffle 45, a second baffle 46, a first side plate 47 and a second side plate 48. The first baffle 45 and the second baffle 46 both extend in the first direction and are symmetrically arranged on both sides of the battery cell group 3 in the second direction. The first side plate 47 and the second side plate 48 both extend in the second direction and are symmetrically arranged on both sides of the battery cell group 3 in the third direction, and are used to isolate the battery cell group 3 from the battery shell 2 through the baffle assembly 44.

[0043] Further, the first baffle 45 is provided with an inner recess 49 on the bottom of both sides in the third direction, and the second baffle 46 is symmetrically provided with the inner recess 49. The first side plate 47 is arranged in the inner recess 49 and is bent and arranged in close contact with the inner recess 49, and the second side plate 48 is symmetrically bent and arranged with the first side plate 47, and is used to be clamped and fixed with the first baffle 45 and the second baffle 46 and limit the battery cell group 3 in the third direction.

[0044] Illustratively, the bent arrangement of the first side plate 47 and the second side plate 48 can be positioned and installed corresponding to the first baffle 45 and the second baffle 46, and the bent arrangement of the first side plate 47 and the second side plate 48 can limit the battery cell group 3 in the third direction, prevent the battery cell group 3 from moving inside the battery pack 1, and affect the safety of the product.

[0045] In some embodiments, the materials of the first baffle 45, the second baffle 46, the first side plate 47 and the second side plate 48 are all polypropylene.

[0046] Illustratively, the PP material has the characteristics of fireproof, waterproof, high temperature resistant, chemical corrosion resistant and wear resistant, and is therefore suitable for the material of the baffle assembly 44 in the present solution.

[0047] In some embodiments, an electric vehicle comprises the battery pack 1 as described in the above embodiments.

[0048] The above embodiments only illustrate the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A battery pack, characterized by, The battery pack comprises: a battery shell extending along a first direction and internally provided with a placement space; a cell group arranged in the placement space and comprising a plurality of cells arranged along a second direction in sequence, each of the cells extending along a third direction; a fixing assembly comprising an insulating piece arranged on the bottom of the placement space and used for bearing the cell group, the insulating piece comprising a plurality of glue grooves arranged along the third direction in sequence, each of the glue grooves extending along the second direction and penetrating through along the first direction; glue filled in the glue grooves, the volume of the glue in each of the glue grooves being equal to the volume of the glue groove, the glue being used for bonding and fixing the plurality of cells and the battery shell, the first direction, the third direction and the second direction being perpendicular to each other.

2. The battery pack of claim 1, wherein, The insulating piece is one of an insulating sheet and an insulating plate, and the thickness of the insulating piece is 0.5mm-2mm.

3. The battery pack of claim 1, wherein, The fixing assembly further comprises a support plate extending along the third direction and arranged on the top of the cell group, and a plurality of upper cover support ribs arranged along the second direction in sequence, each of the upper cover support ribs comprising a bottom plate extending along the third direction and arranged on the top of the support plate, and two end plates arranged on the two ends of the bottom plate along the third direction, the ends of the two end plates being folded in opposite directions along the third direction and used for abutting against and limiting the battery shell.

4. The battery pack of claim 3, wherein, The fixing assembly further comprises a pressing tool, the plurality of upper cover support ribs and the battery shell cooperatively defining a limiting space extending along the second direction, and the pressing tool being arranged in the limiting space and used for pressing the cell group through the pressing tool.

5. The battery pack of claim 1, wherein, The fixing assembly further comprises a baffle assembly arranged in the placement space and comprising a first baffle, a second baffle, a first side plate and a second side plate, the first baffle and the second baffle both extending along the first direction and symmetrically arranged on the two sides of the cell group along the second direction, and the first side plate and the second side plate both extending along the second direction and symmetrically arranged on the two sides of the cell group along the third direction, the baffle assembly being used for isolating the cell group from the battery shell.

6. The battery pack of claim 5, wherein, The first baffle is provided with a concave area on the bottom of each of the two sides along the third direction, the second baffle is symmetrically provided with the concave area with the first baffle, the first side plate is arranged in the concave area and bent to fit the concave area, and the second side plate is symmetrically bent with the first side plate and used for clamping and fixing the first baffle and the second baffle and limiting the cell group in the third direction.

7. The battery pack of claim 5, wherein, The materials of the first baffle, the second baffle, the first side plate and the second side plate are all polypropylene.

8. An electric vehicle, characterized by The battery pack comprises any one of the battery packs according to claims 1-7.

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