Battery pack

Abstract

The utility model provides a battery pack which comprises a battery shell and a battery cell assembly accommodated in the battery shell, the battery cell assembly comprises a support and a plurality of battery cells installed on the support, the plurality of battery cells are electrically connected through a plurality of conductive parts, and the plurality of conductive parts are all arranged on the outer wall of the support; the adjacent conductive parts are arranged at intervals; the battery pack further comprises an insulation structure located on the outer wall of the battery cell assembly, and the insulation structure is arranged on the path of the shortest creepage distance of the adjacent conductive parts. According to the battery pack, the insulation structures are arranged on the paths with the shortest creepage distances of the adjacent conductive parts, so that the insulation performance between the adjacent conductive parts is improved, the risk of short circuit between the adjacent conductive parts caused by external water, dust and the like entering the battery shell is reduced, the risk of spontaneous combustion caused by short circuit of the battery pack is further reduced, and the service life of the battery pack is prolonged. And the use safety of the battery pack is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery pack structure technology, and in particular to a battery pack. Background Technology

[0002] A power tool's battery pack typically includes a battery housing and multiple battery cells housed within the housing. These cells are electrically connected via multiple conductive components to achieve series or parallel connection.

[0003] In actual use, especially in outdoor working environments, rainwater, dust, or other corrosive liquids can easily penetrate the battery pack of power tools, causing short circuits between adjacent conductive parts within the battery pack. This can lead to short circuits between battery cells, and consequently, short circuits and spontaneous combustion of the battery pack. Utility Model Content

[0004] The purpose of this invention is to provide a battery pack that can reduce the risk of short circuit and spontaneous combustion.

[0005] This utility model provides a battery pack, including a battery housing and a cell assembly housed within the battery housing. The cell assembly includes a bracket and a plurality of cells mounted on the bracket. The plurality of cells are electrically connected to each other through a plurality of conductive elements, all of which are disposed on the outer wall of the bracket. Adjacent conductive elements are spaced apart from each other. The battery pack also includes an insulating structure located on the outer wall of the cell assembly, the insulating structure being disposed on the path of the shortest creepage distance of the adjacent conductive elements.

[0006] In one possible implementation, the insulating structure includes an insulating coating applied to the outer wall of the cell assembly.

[0007] In one feasible manner, the insulating coating covers an area where the shortest creepage distance between adjacent conductive elements is less than 15 mm.

[0008] In one possible implementation, the insulating coating is applied to the outer edge of the conductive element and / or the outer wall of the support.

[0009] In one possible implementation, at least a portion of the insulating coating abuts against the inner wall of the battery casing.

[0010] In one possible implementation, the insulating structure includes insulating ribs protruding from the outer wall of the support, the insulating ribs being disposed between adjacent conductive elements.

[0011] In one possible implementation, the insulating structure further includes an insulating coating applied to the surface of the insulating rib.

[0012] In one possible implementation, a plurality of said cells are arranged in at least two rows and at least two columns along a first direction and a second direction, wherein the first direction and the second direction are perpendicular to each other.

[0013] The plurality of conductive components include at least one first conductive connecting piece, the first conductive connecting piece being inclined, the extension direction of the first conductive connecting piece being neither parallel to the first direction nor parallel to the second direction; the insulating structure is provided between the first conductive connecting piece and the adjacent conductive component.

[0014] In one possible implementation, the insulating structure includes an insulating rib protruding from the outer wall of the support, the insulating rib being disposed between adjacent conductive elements; the first conductive connecting piece has a clearance groove corresponding to the position of the insulating rib.

[0015] In one possible implementation, the battery cell assembly further includes a circuit board disposed on the outer wall of the bracket; each of the conductive elements is provided with an extension, and each conductive element is electrically connected to the circuit board through a corresponding extension.

[0016] The battery pack provided by this utility model has an insulating structure set on the path of the shortest creepage distance between adjacent conductive parts. The insulating structure can play an insulating role, improve the insulation performance between adjacent conductive parts, thereby reducing the risk of short circuit between adjacent conductive parts caused by external water, dust and other substances entering the battery casing, thereby reducing the risk of short circuit and spontaneous combustion of the battery pack and improving the safety of the battery pack. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the battery pack in an embodiment of the present invention.

[0018] Figure 2 for Figure 1 A schematic diagram of the explosion structure.

[0019] Figure 3 This is a three-dimensional structural diagram of the battery cell assembly in an embodiment of this utility model.

[0020] Figure 4 for Figure 3 The main view.

[0021] Figure 5 for Figure 3 Rear view.

[0022] Figure 6 for Figure 5 A magnified view of a portion of location A in the diagram.

[0023] Figure 7for Figure 6 A schematic diagram of a partial cross-section at position BB. Detailed Implementation

[0024] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0025] The terms "first," "second," "third," "fourth," etc., used in the specification and claims of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0026] like Figures 1 to 7 As shown, the battery pack provided in this embodiment of the present invention includes a battery casing 1 and a cell assembly M housed within the battery casing 1. The cell assembly M includes a support 2 and multiple cells 3 mounted on the support 2. The multiple cells 3 are electrically connected to each other through multiple conductive elements 4. The multiple conductive elements 4 are all disposed on the outer wall of the support 2, and adjacent conductive elements 4 are spaced apart from each other. The battery pack also includes an insulating structure 5 located on the outer wall of the cell assembly M. The insulating structure 5 is disposed on the path of the shortest creepage distance between adjacent conductive elements 4. The shortest creepage distance is generally the shortest distance between adjacent conductive elements 4, that is, the insulating structure 5 is disposed at least between the shortest distance between adjacent conductive elements 4. By providing the insulating structure 5 on the path of the shortest creepage distance between adjacent conductive elements 4, the insulating structure 5 can play an insulating role, improve the insulation performance between adjacent conductive elements 4, and thereby reduce the risk of short circuit between adjacent conductive elements 4 caused by external water, dust, etc. entering the battery casing 1.

[0027] like Figures 4 to 7 As shown, in one embodiment, the shortest creepage distance between adjacent conductive elements 4 is L, where 1mm ≤ L ≤ 25mm. This setting not only prevents short circuits between adjacent conductive elements 4 but also ensures that each conductive element 4 has a sufficiently large area to guarantee heat dissipation performance. Preferably, 3mm ≤ L ≤ 10mm, so that each conductive element 4 can meet the arrangement of conventionally sized battery cells 3. More preferably, 7mm ≤ L ≤ 8mm, thereby reducing the risk of short circuits between adjacent conductive elements 4 caused by external water, dust, etc., entering the battery casing 1 under special circumstances.

[0028] like Figures 3 to 7 As shown, in one embodiment, the insulating structure 5 includes insulating ribs 52 protruding from the outer wall of the support 2, and the insulating ribs 52 are disposed between adjacent conductive elements 4. The insulating ribs 52 can isolate adjacent conductive elements 4, increase the creepage distance between adjacent conductive elements 4, and thus improve the insulation performance between adjacent conductive elements 4.

[0029] In one embodiment, the bracket 2 is made of insulating material, and the insulating rib 52 is an integral structure with the bracket 2, and the insulating rib 52 is made of the same insulating material as the bracket 2.

[0030] like Figures 5 to 7 As shown, in one embodiment, the insulating structure 5 also includes an insulating coating 51, which is applied to the outer wall of the cell assembly M. Specifically, the insulating coating 51 can be applied to the outer edge of the conductive element 4 and / or the outer wall of the support 2.

[0031] Specifically, the insulating coating 51 is applied to one or more locations on the surface of the conductive element 4 away from the support 2, on the side wall of the conductive element 4, and on the outer wall of the support 2; preferably, the insulating coating 51 is provided at each of the above locations. The insulating coating 51 can isolate adjacent conductive elements 4, further improving the insulation performance between adjacent conductive elements 4.

[0032] In one implementation, the insulating coating 51 covers a first region between adjacent conductive elements 4, which is the area where the shortest creepage distance L between adjacent conductive elements 4 is less than 15 mm. In another implementation, when 1 mm ≤ L < 15 mm, since the shortest creepage distance L between adjacent conductive elements 4 is relatively small, the insulating coating 51 covers the area where the shortest creepage distance L between adjacent conductive elements 4 is less than 15 mm; when 15 mm ≤ L ≤ 25 mm, since the shortest creepage distance L between adjacent conductive elements 4 is relatively large, the insulating coating 51 can be applied only to the location where the shortest creepage distance between adjacent conductive elements 4 is.

[0033] like Figures 5 to 7 As shown, in one embodiment, the insulating coating 51 is also applied to the surface of the insulating rib 52. Specifically, the insulating coating 51 is disposed at any one or more locations on the surface of the insulating rib 52 away from the support 2, or on the sidewall of the insulating rib 52; preferably, the insulating coating 51 is disposed at each of the above locations, that is, the insulating coating 51 is disposed on the entire surface of the insulating rib 52.

[0034] As one implementation method, the insulating coating 51 is made of silicone sealant, which has good adhesive strength, sealing performance, high and low temperature resistance, and insulation performance. During manufacturing, the silicone sealant can be applied to the surface of the conductive component 4 and / or the surface of the support 2 and / or the surface of the insulating rib 52 by brushing or other methods. After curing, the insulating coating 51 is obtained. Simultaneously, since the conductive component 4 and the battery cell 3 are generally connected by welding, during manufacturing, the conductive component 4 and the battery cell 3 need to be welded first, and then the silicone sealant needs to be applied to avoid the silicone sealant being applied to the welding area and affecting the welding performance of the conductive component 4 and the battery cell 3.

[0035] In one embodiment, the conductive element 4 is a thin sheet-like conductive connecting piece, and the conductive element 4 is connected to the positive / negative electrode of the battery cell 3 by welding.

[0036] In one embodiment, at least a portion of the insulating coating 51 abuts against the inner wall of the battery casing 1. This arrangement improves the insulation performance between the cell assembly M and the battery casing 1, and also provides shock absorption and cushioning for the cell assembly M, reducing the risk of vibration damage during use. Specifically, in this embodiment, since the insulating coating 51 on the surface of the conductive element 4 and the insulating rib 52 protrudes beyond the outer wall of the cell assembly M, it can abut against the inner wall of the battery casing 1.

[0037] like Figures 2 to 5 As shown, in one embodiment, the battery cell 3 is a cylindrical battery cell. Multiple battery cells 3 are arranged in at least two rows and at least two columns along a first direction X and a second direction Z. The positive and negative electrodes of each battery cell 3 are located on opposite sides along a third direction Y. The first direction X, the second direction Z, and the third direction Y are mutually perpendicular, and the third direction Y is parallel to the axial direction of the battery cell 3. Multiple conductive elements 4 are located on opposite sides of the battery cell assembly M along the third direction Y, and the multiple battery cells 3 are connected in series through multiple conductive elements 4. Of course, in other embodiments, the multiple battery cells 3 can also be connected in parallel through multiple conductive elements 4.

[0038] Specifically, in this embodiment, the number of battery cells 3 is 10. These 10 battery cells 3 are arranged in two rows and five columns along the first direction X and the second direction Z, with each row including five battery cells 3 and each column including two battery cells 3. Of course, in other embodiments, the number of battery cells 3 can be other, and the multiple battery cells 3 can be arranged in other ways.

[0039] like Figures 2 to 5As shown, in one embodiment, the plurality of conductive components 4 include at least one first conductive connecting piece 41. The first conductive connecting piece 41 is inclined, that is, the extension direction of the first conductive connecting piece 41 is neither parallel to the first direction X nor parallel to the second direction Z. An insulating structure 5 is provided between the first conductive connecting piece 41 and its adjacent conductive component 4. Specifically, in this embodiment, the two ends of each first conductive connecting piece 41 are respectively connected to two battery cells 3 arranged diagonally, thus making the first conductive connecting piece 41 inclined. This inclined first conductive connecting piece 41 is prone to being too close to its adjacent conductive component 4. Therefore, an insulating structure 5 is provided between the first conductive connecting piece 41 and its adjacent conductive component 4 to improve the insulation performance between the two. Meanwhile, a clearance groove 411 is provided on the first conductive connecting piece 41 at the position corresponding to the insulating rib 52. The clearance groove 411 is used to reduce the width of the first conductive connecting piece 41. On the one hand, it facilitates the setting of the insulating rib 52 and avoids interference between the first conductive connecting piece 41 and the insulating rib 52. On the other hand, it can increase the distance between the first conductive connecting piece 41 and the local position of its adjacent conductive component 4, thereby improving the insulation performance.

[0040] Specifically, in this embodiment, the plurality of conductive elements 4 include a plurality of first conductive connecting pieces 41, a plurality of second conductive connecting pieces 42, a third conductive connecting piece 43, and two total electrode conductive connecting pieces 44. The first conductive connecting pieces 41, the third conductive connecting pieces 43, and the total electrode conductive connecting pieces 44 are located on one side of the cell assembly M, and the plurality of second conductive connecting pieces 42 are located on the opposite side of the cell assembly M. The plurality of first conductive connecting pieces 41 are arranged at intervals along a first direction X; the second conductive connecting pieces 42 extend along a second direction Z, and the two ends of each second conductive connecting piece 42 are respectively connected to two cells 3 in the same column, and the plurality of second conductive connecting pieces 42 are arranged at intervals along the first direction X; the third conductive connecting piece 43 extends along the first direction X, and the two ends of the third conductive connecting piece 43 are respectively connected to two cells 3 in the same row; the two total electrode conductive connecting pieces 44 are respectively connected to the two outermost cells 3 along the first direction X, so as to lead out the plurality of series-connected cells 3.

[0041] like Figure 2 and Figure 5 As shown, in one embodiment, the bracket 2 has a hollow structure, and multiple battery cells 3 are disposed inside the bracket 2. The outer wall of the bracket 2 is provided with a mounting groove 22 that conforms to the shape of the conductive element 4, and the conductive element 4 is disposed in the mounting groove 22; at the same time, the outer wall of the bracket 2 is provided with a protrusion 21, and the conductive element 4 is provided with a locking hole 400. The protrusion 21 is locked in the locking hole 400 to further fix the conductive element 4.

[0042] like Figures 2 to 5As shown, in one embodiment, the battery cell assembly M further includes a circuit board 6, which is disposed on the outer wall of the support 2. The circuit board 6 and multiple conductive elements 4 are respectively disposed on the outer wall of different sides of the support 2. Each conductive element 4 is provided with an extension 40, which is an integral structure with the conductive element 4. Each conductive element 4 is electrically connected to the circuit board 6 through its corresponding extension 40. This arrangement allows the circuit board 6 to be fixed by the multiple conductive elements 4, and also allows both ends of each battery cell 3 to be electrically connected to the circuit board 6, facilitating the monitoring of the status of each battery cell 3.

[0043] like Figures 1 to 5 As shown, in one embodiment, the circuit board 6 is provided with a connector 61, which is electrically connected to the circuit board 6; the battery housing 1 is provided with a clearance hole 121 corresponding to the position of the connector 61, so that the connector 61 is exposed through the clearance hole 121. The connector 61 is used to make an electrical connection with a charger or electrical device to facilitate charging the battery pack or the battery pack supplying power to the electrical device. Specifically, in this embodiment, the battery housing 1 includes a main housing 11 and a top cover 12 that are connected to each other, the battery cell assembly M is disposed in the main housing 11, and the clearance hole 121 is disposed on the top cover 12.

[0044] This utility model embodiment also provides an electric tool, including the battery pack described above; the electric tool is, for example, a drill, an electric wrench, a grinder, a cutter, etc.

[0045] The battery pack provided in this embodiment of the utility model has an insulating structure 5 set on the path of the shortest creepage distance between adjacent conductive parts 4. The insulating structure can play an insulating role, improve the insulation performance between adjacent conductive parts 4, thereby reducing the risk of short circuit between adjacent conductive parts 4 caused by external water, dust and other substances entering the battery casing 1, thereby reducing the risk of short circuit and spontaneous combustion of the battery pack and improving the safety of the battery pack.

[0046] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A battery pack, comprising a battery housing and a cell assembly received in the battery housing, the cell assembly comprising a bracket and a plurality of cells mounted on the bracket, the plurality of cells being electrically connected by a plurality of conductive members, the plurality of conductive members being disposed on an outer wall of the bracket; characterized in that, The conductive members are spaced apart from each other and have a creepage distance; the battery pack further comprises an insulation structure on the outer wall of the battery cell assembly, the insulation structure being arranged on a path of the shortest creepage distance between adjacent conductive members.

2. The battery pack of claim 1, wherein, The insulation structure comprises an insulation coating coated on the outer wall of the battery cell assembly.

3. The battery pack of claim 2, wherein, The insulation coating covers a first region between adjacent conductive members, the first region being a region where the shortest creepage distance of the conductive members is less than 15 mm.

4. The battery pack of claim 2, wherein, The insulation coating is coated on the outer edge of the conductive member and / or the outer wall of the bracket.

5. The battery pack of claim 2, wherein, At least part of the insulation coating is in abutment with the inner wall of the battery shell.

6. The battery pack of claim 1, wherein, The insulation structure comprises an insulation protrusion protruding from the outer wall of the bracket, the insulation protrusion being arranged between adjacent conductive members.

7. The battery pack of claim 6, wherein, The insulation structure further comprises an insulation coating coated on the surface of the insulation protrusion.

8. The battery pack of claim 1, wherein, The plurality of battery cells are arranged in at least two rows and at least two columns along a first direction and a second direction, the first direction being perpendicular to the second direction. The plurality of conductive members comprises at least one first conductive connecting piece, the first conductive connecting piece being arranged obliquely, the extension direction of the first conductive connecting piece being neither parallel to the first direction nor parallel to the second direction; the insulation structure is arranged between the first conductive connecting piece and its adjacent conductive members.

9. The battery pack of claim 8, wherein, The insulation structure comprises an insulation protrusion protruding from the outer wall of the bracket, the insulation protrusion being arranged between adjacent conductive members; the first conductive connecting piece is provided with a avoiding slot corresponding to the position of the insulation protrusion.

10. The battery pack of any one of claims 1-9, wherein, The battery cell assembly further comprises a circuit board arranged on the outer wall of the bracket; each conductive member is provided with an extension part, and each conductive member is electrically connected to the circuit board through the corresponding extension part.

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