A lithium battery pack

Abstract

The present invention relates to the field of lithium battery technology, and discloses a lithium battery pack, including a seat body with a predetermined space, a plurality of first battery cells installed in the predetermined space, and a fan; each first battery cell includes a first battery body with a first heating surface and a first guide block with a first predetermined surface; in each first battery cell: the first heating surface and the first predetermined surface are fitted, a first groove is provided on the first predetermined surface, and the first heating surface and the inner wall of the first groove form a first guide channel; the air outlet of the fan is respectively connected with the plurality of first guide channels, a plurality of first heat dissipation ports are provided on the seat body, the plurality of first heat dissipation ports correspond to the first battery cells one by one, and each first guide channel is connected with the outside through the first heat dissipation port. The present invention can effectively discharge the heat generated in each first battery cell out of the seat body, avoid the heat accumulation of individual first battery cells leading to high temperature, and extend the service life of the lithium battery pack.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and in particular to a lithium battery pack. Background Art

[0002] In existing lithium battery packs, a standard electronic plug-in box is generally used for series connection and voltage boosting through external wires.

[0003] Since lithium batteries generate heat during use and expand over time, this will greatly shorten the service life of the lithium battery pack. Therefore, it is necessary to dissipate heat from the heated lithium battery pack.

[0004] Due to the compact structure of the lithium battery pack, the prior art uses forced air cooling to dissipate heat from the peripheral structure of the lithium battery pack. However, for the batteries in the middle of the lithium battery pack, the heat generated by this method will be gathered in the middle of the lithium battery pack, resulting in a large operating temperature difference between the batteries at the edge and the middle of the lithium battery pack. Long-term use will lead to differences between the batteries in the middle and the batteries on the outside, affecting the integrity of the lithium battery pack, thereby affecting the overall service life of the lithium battery pack. Summary of the invention

[0005] The object of the present invention is to provide a lithium battery pack capable of effectively dissipating heat from each battery.

[0006] In order to achieve the above-mentioned purpose, the present invention provides a lithium battery pack, comprising a base body with a predetermined space, a plurality of first battery cells installed in the predetermined space, and a fan; each of the first battery cells comprises a first battery body with a first heating surface and a first guide block with a first predetermined surface; in each of the first battery cells: the first heating surface and the first predetermined surface are in contact with each other, a first groove is provided on the first predetermined surface, and the first heating surface and the inner wall of the first groove form a first guide channel; the air outlet of the fan is respectively connected with the plurality of first guide channels, the base body is provided with a plurality of first heat dissipation ports, the plurality of first heat dissipation ports correspond one-to-one to the first battery cells, and each of the first guide channels is connected with the outside through the first heat dissipation ports.

[0007] Furthermore, a plurality of first protrusions are provided in the first flow guiding channel, and the plurality of first protrusions divide the first flow guiding channel into a plurality of first sub-channels.

[0008] Furthermore, it also includes a plurality of second battery cells; each of the second battery cells includes a second battery body having a second heating surface and a second guide block having a second predetermined surface; in each of the second battery cells: the second heating surface and the second predetermined surface are in contact with each other, a second groove is provided on the second predetermined surface, and the second heating surface and the inner wall of the second groove form a second guide channel; the air outlet of the fan is respectively connected with the plurality of the second guide channels, a plurality of second heat dissipation ports are provided on the seat body, the plurality of the second heat dissipation ports correspond one-to-one to the second battery cells, and each of the second guide channels is connected with the outside through the second heat dissipation ports; the plurality of the first battery cells and the plurality of the second battery cells correspond one-to-one, and the first battery cells and the second battery cells are connected in series.

[0009] Furthermore, a plurality of second protrusions are provided in the second flow guiding channel, and the plurality of second protrusions divide the second flow guiding channel into a plurality of second sub-channels.

[0010] Furthermore, each of the first battery bodies is a columnar structure with a rectangular cross-section, and each of the second battery bodies is a columnar structure with a rectangular cross-section; in each of the first battery cells, the first heating surface is formed on a predetermined side surface of the first battery body; in each of the second battery cells, the second heating surface is formed on a predetermined side surface of the second battery body; multiple first heating surfaces are parallel to each other, and multiple second heating surfaces are parallel to each other; multiple first battery cells are arranged at intervals along a predetermined direction, and multiple second battery cells are arranged at intervals along the predetermined direction.

[0011] Furthermore, the seat body includes a front side panel, a rear side panel, a left side panel, a right side panel, an upper side panel and a lower side panel; the front side panel, the rear side panel, the left side panel, the right side panel, the upper side panel and the lower side panel enclose the predetermined space; a plurality of the first battery bodies are respectively mounted on the lower side panel, a plurality of the second battery bodies are respectively mounted on the lower side panel, and the fan is arranged in the predetermined space and mounted on the upper side panel.

[0012] Further, multiple first heat dissipation ports are arranged on the front side panel, and multiple second heat dissipation ports are arranged on the rear side panel; multiple first grooves are all arc-shaped grooves, one end of each first groove is respectively facing the air outlet of the fan, and the other end of each first groove is respectively facing the first heat dissipation port; multiple second grooves are all arc-shaped grooves, one end of each second groove is respectively facing the air outlet of the fan, and the other end of each second groove is respectively facing the second heat dissipation port.

[0013] Furthermore, a thermal conductive adhesive is applied between the first heating surface and the first predetermined surface, and a thermal conductive adhesive is applied between the second heating surface and the second predetermined surface.

[0014] Further, a plurality of the first battery cells are connected in parallel, and a plurality of the second battery cells are connected in parallel.

[0015] Furthermore, the fan is provided in plurality.

[0016] Compared with the prior art, the lithium battery pack of the embodiment of the present invention has the following beneficial effects:

[0017] When the lithium battery pack of the embodiment of the present invention is in use, the multiple first battery cells work and output electrical energy to the outside, and heat is generated at the same time; at this time, the fan works to discharge the gas in each first flow guide channel through the corresponding first heat dissipation port, thereby achieving heat dissipation of the multiple battery cells. The heat dissipation method of this embodiment can effectively discharge the heat generated in each first battery cell out of the seat body, avoid the heat accumulation of individual first battery cells leading to high temperature, and extend the service life of the lithium battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 1 is an exploded view of a lithium battery pack according to an embodiment of the present invention.

[0019] Figure 2 1 is an assembly diagram of a lithium battery pack according to an embodiment of the present invention.

[0020] Figure 3 1 is an exploded view of a first battery cell and a second battery cell in the same column of a lithium battery pack according to an embodiment of the present invention.

[0021] Figure 4 It is an exploded view of the first battery cell and the second battery cell in the same column of the lithium battery pack according to the embodiment of the present invention in another direction.

[0022] Figure 5 Schematic diagram of a first middle partition of a lithium battery pack according to an embodiment of the present invention.

[0023] Figure 6 Schematic diagram of a second middle partition of a lithium battery pack according to an embodiment of the present invention.

[0024] Figure 7 Schematic diagram of the lower side panel of the lithium battery pack according to an embodiment of the present invention.

[0025] In the figure, 1, seat body; 11, front side plate; 12, rear side plate; 13, left side plate; 14, right side plate; 15, upper side plate; 16, lower side plate; 161, first lower slot; 162, second lower slot; 17, first middle partition; 171, first upper slot; 172, second upper slot; 18, second middle partition; 181, first slot; 182, second slot;

[0026] 2. first battery unit; 21. first battery body; 211. first heating surface; 22. first guide block; 221. first predetermined surface; 222. first groove; 223. first protrusion;

[0027] 3. Fan; 4. First heat dissipation outlet;

[0028] 5. second battery unit; 51. second battery body; 511. second heating surface; 52. second guide block; 521. second predetermined surface; 522. second groove; 523. second protrusion;

[0029] 6. Second heat dissipation outlet. DETAILED DESCRIPTION

[0030] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] like Figure 1 -7, a lithium battery pack of a preferred embodiment of the present invention comprises a seat body 1 with a predetermined space, a plurality of first battery cells 2 installed in the predetermined space, and a fan 3; each of the first battery cells 2 comprises a first battery body 21 with a first heating surface 211 and a first guide block 22 with a first predetermined surface 221; in each of the first battery cells 2: the first heating surface 211 and the first predetermined surface 221 are in contact with each other, a first groove 222 is provided on the first predetermined surface 221, and the first heating surface 211 and the inner wall of the first groove 222 form a first guide channel; the air outlet of the fan 3 is respectively connected with the plurality of the first guide channels, a plurality of first heat dissipation ports 4 are provided on the seat body 1, and the plurality of the first heat dissipation ports 4 correspond to the first battery cells 2 one by one, and each of the first guide channels is connected with the outside through the first heat dissipation ports 4.

[0036] In this embodiment, when in use, multiple first battery units 2 work, output electrical energy to the outside, and generate heat at the same time; at this time, the fan 3 works to discharge the gas in each first flow guide channel through the corresponding first heat dissipation port 4, thereby achieving heat dissipation of multiple battery units. The heat dissipation method of this embodiment can effectively discharge the heat generated in each first battery unit 2 from the seat body 1, avoid the heat accumulation of individual first battery units 2 resulting in high temperature, and extend the service life of the lithium battery pack.

[0037] Further, in one embodiment, see Figure 1 -7, the first flow guiding channel is provided with a plurality of first protrusions 223, and the plurality of first protrusions 223 divide the first flow guiding channel into a plurality of first sub-channels. In this embodiment, the channel cross section of each first sub-channel is small, and turbulence is not easily generated when the gas flows therein, thereby reducing flow loss.

[0038] Further, in one embodiment, see Figure 1-7, also includes a plurality of second battery cells 5; each of the second battery cells 5 includes a second battery body 51 with a second heating surface 511 and a second guide block 52 with a second predetermined surface 521; in each of the second battery cells 5: the second heating surface 511 and the second predetermined surface 521 are fitted, a second groove 522 is provided on the second predetermined surface 521, and the second heating surface 511 and the inner wall of the second groove 522 form a second guide channel; the air outlet of the fan 3 is respectively connected with the plurality of the second guide channels, a plurality of second heat dissipation ports 6 are provided on the seat body 1, and the plurality of the second heat dissipation ports 6 correspond to the second battery cells 5 one by one, and each of the second guide channels is connected with the outside through the second heat dissipation ports 6; the plurality of the first battery cells 2 and the plurality of the second battery cells 5 correspond to each other one by one, and the first battery cells 2 and the second battery cells 5 are connected in series. In this embodiment, when in use, the plurality of the second battery cells 5 work, output electric energy to the outside, and heat is generated at the same time; at this time, the fan 3 works, and the gas in each second guide channel is discharged through the corresponding second heat dissipation ports 6, thereby realizing heat dissipation of the plurality of battery cells. The heat dissipation method of this embodiment can effectively discharge the heat generated in each second battery unit 5 from the seat 1, avoiding the heat accumulation of individual second battery units 5 leading to high temperature, and extending the service life of the lithium battery pack; in addition, this embodiment can also increase the output voltage of the lithium battery pack.

[0039] Further, in one embodiment, see Figure 1 -7, the second flow guiding channel is provided with a plurality of second protrusions 523, and the plurality of second protrusions 523 divide the second flow guiding channel into a plurality of second sub-channels. In this embodiment, similarly, the channel cross section of each second sub-channel is small, and turbulence is not easily generated when the gas flows therein, thereby reducing flow loss.

[0040] Further, in one embodiment, see Figure 1 -7. Each of the first battery bodies 21 is a columnar structure with a rectangular cross-section, and each of the second battery bodies 51 is a columnar structure with a rectangular cross-section; in each of the first battery cells 2, the first heating surface 211 is formed on a predetermined side surface of the first battery body 21; in each of the second battery cells 5, the second heating surface 511 is formed on a predetermined side surface of the second battery body 51; multiple first heating surfaces 211 are parallel to each other, and multiple second heating surfaces 511 are parallel to each other; multiple first battery cells 2 are spaced apart along a predetermined direction, and multiple second battery cells 5 are spaced apart along the predetermined direction.

[0041] Further, in one embodiment, see Figure 1-7, the seat body 1 includes a front side plate 11, a rear side plate 12, a left side plate 13, a right side plate 14, an upper side plate 15 and a lower side plate 16; the front side plate 11, the rear side plate 12, the left side plate 13, the right side plate 14, the upper side plate 15 and the lower side plate 16 enclose the predetermined space; a plurality of the first battery bodies 21 are respectively mounted on the lower side plate 16, a plurality of the second battery bodies 51 are respectively mounted on the lower side plate 16, and the fan 3 is arranged in the predetermined space and mounted on the upper side plate 15. In this embodiment, the seat body 1 is set as a rectangular frame structure, which is suitable for a variety of usage situations.

[0042] Further, in one embodiment, see Figure 1 -7, multiple first heat dissipation ports 4 are arranged on the front side plate 11, and multiple second heat dissipation ports 6 are arranged on the rear side plate 12; multiple first grooves 222 are all arc-shaped grooves, one end of each first groove 222 faces the air outlet of the fan 3, and the other end of each first groove 222 faces the first heat dissipation port 4; multiple second grooves 522 are all arc-shaped grooves, one end of each second groove 522 faces the air outlet of the fan 3, and the other end of each second groove 522 faces the second heat dissipation port 6. In this embodiment, the first heat dissipation port 4 and the second heat dissipation port 6 are located on opposite side plates, and will not affect each other, thereby improving the heat dissipation efficiency.

[0043] Specifically, in one implementation, see Figure 1 -7, a plurality of first battery cells 2 and a plurality of second battery cells 5 are distributed in a matrix.

[0044] Specifically, in one implementation, see Figure 1 -7, the opening of the first groove 222 faces the predetermined direction, and the opening of the second groove 522 faces away from the predetermined direction. In this embodiment, the mutual influence of the heat dissipation airflow in the first guide channel and the second guide channel in the same column is avoided.

[0045] Specifically, in one implementation, see Figure 1 -7, the lower side plate 16 is provided with a plurality of first lower slots 161 corresponding to the plurality of first battery units 2, and the first battery body 21 of each of the first battery units 2 is inserted into the corresponding first lower slot 161; the lower side plate 16 is also provided with a plurality of second lower slots 162 corresponding to the plurality of second battery units 5, and the second battery body 51 of each of the second battery units 5 is inserted into the corresponding second lower slot 162.

[0046] Specifically, in one implementation, see Figure 1-7, a first middle partition 17 parallel to the lower side plate 16 is further provided in the predetermined space, and a plurality of first upper slots 171 corresponding to the plurality of first battery units 2 are provided on the first middle partition 17, and the first battery body 21 of each of the first battery units 2 is inserted into the corresponding first upper slot 171; a plurality of second upper slots 172 corresponding to the plurality of second battery units 5 are further provided on the first middle partition 17, and the second battery body 51 of each of the second battery units 5 is inserted into the corresponding second upper slot 172.

[0047] Specifically, in one implementation, see Figure 1 -7, the predetermined space is also provided with a second intermediate partition 18 parallel to the lower side plate 16 and between the first intermediate partition 17 and the upper side plate 15; the second intermediate partition 18 is provided with a plurality of first slots 181 corresponding to the plurality of first guide blocks 22 and a plurality of second slots 182 corresponding to the plurality of second guide blocks 52; the first intermediate partition 17 is also provided with a plurality of first through holes corresponding to the plurality of first guide blocks 22 and a plurality of second through holes corresponding to the plurality of second guide blocks 52, each of the first guide blocks 22 sequentially passes through the corresponding first through holes and is inserted into the corresponding first slot 181, and each of the second guide blocks 52 sequentially passes through the corresponding second through holes and is inserted into the corresponding second slot 182. A first gap for gas to pass through is formed between each of the first guide blocks 22 and the inner wall of the corresponding first slot 181, and a second gap for gas to pass through is formed between each of the second guide blocks 52 and the inner wall of the corresponding second slot 182. The first through hole is connected to the first upper slot 171, and the second through hole is connected to the second upper slot 172.

[0048] Specifically, in one implementation, see Figure 1 -7. The second middle partition 18 is provided with an area for placing the fan 3.

[0049] Specifically, in one implementation, see Figure 1 -7, in order to facilitate the installation of the second intermediate partition 18, the second intermediate partition 18 is set to a split structure, and the second intermediate partition 18 is divided into two parts, such as Figure 6 shown.

[0050] Specifically, in one implementation, see Figure 1 -7, the first lower slot 161, the second lower slot 162, the first upper slot 171, the second upper slot 172, the first slot 181, and the second slot 182 are all strip-shaped slots.

[0051] Specifically, in one implementation, see Figure 1-7, a plurality of first air guide plates are arranged on the outer side of the front side plate 11, and the plurality of first air guide plates correspond to the plurality of first heat dissipation ports 4 one by one, and the plurality of first air guide plates are respectively covered at the corresponding first heat dissipation ports 4 to prevent dust from entering the predetermined space through the first heat dissipation ports 4. A plurality of second air guide plates are arranged on the outer side of the rear side plate, and the plurality of second air guide plates correspond to the plurality of second heat dissipation ports 6 one by one, and the plurality of second air guide plates are respectively covered at the corresponding second heat dissipation ports 6 to prevent dust from entering the predetermined space through the second heat dissipation ports 6.

[0052] Specifically, in one implementation, see Figure 1 -7, also includes a control circuit board, a plurality of first power terminals, and a plurality of second power terminals, the circuit board is arranged in the predetermined space and installed on the inner wall of the left side plate 13; the plurality of first power terminals correspond one-to-one to the plurality of first battery cells 2, each first battery body 21 is electrically connected to the first power terminal, and each of the first power terminals is electrically connected to the control circuit board respectively; the plurality of second power terminals correspond one-to-one to the plurality of second battery cells 5, each second battery body 51 is electrically connected to the second power terminal, and each of the second power terminals is electrically connected to the control circuit board respectively.

[0053] Specifically, in one implementation, see Figure 1 -7, the first heat dissipation opening 4 and the second heat dissipation opening 6 are both strip-shaped openings.

[0054] Further, in one embodiment, see Figure 1 -7. A thermal conductive adhesive is applied between the first heating surface 211 and the first predetermined surface 221 , and a thermal conductive adhesive is applied between the second heating surface 511 and the second predetermined surface 521 .

[0055] Further, in one embodiment, see Figure 1 -7. A plurality of the first battery units 2 are connected in parallel, and a plurality of the second battery units 5 are connected in parallel.

[0056] Further, in one embodiment, see Figure 1 -7, the fan 3 is provided in plurality.

[0057] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0058] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A lithium battery pack, characterized in that: It comprises a seat body having a predetermined space, a plurality of first battery units installed in the predetermined space, and a fan; Each of the first battery units includes a first battery body having a first heat-generating surface and a first guide block having a first predetermined surface; In each of the first battery cells: the first heating surface is attached to the first predetermined surface, a first groove is provided on the first predetermined surface, and the first heating surface and the inner wall of the first groove form a first guide channel; The air outlet of the fan is respectively connected to the plurality of the first guide channels, the seat body is provided with a plurality of first heat dissipation openings, the plurality of the first heat dissipation openings correspond to the first battery units one by one, and each of the first guide channels is connected to the outside through the first heat dissipation openings; A plurality of first protrusions are provided in the first flow guiding channel, and the plurality of first protrusions divide the first flow guiding channel into a plurality of first sub-channels; Also included are a plurality of second battery cells; Each of the second battery units includes a second battery body having a second heat-generating surface and a second guide block having a second predetermined surface; In each of the second battery cells: the second heating surface is attached to the second predetermined surface, a second groove is provided on the second predetermined surface, and the second heating surface and the inner wall of the second groove form a second guide channel; The air outlet of the fan is respectively connected to the plurality of second guide channels, the seat body is provided with a plurality of second heat dissipation ports, the plurality of second heat dissipation ports correspond to the second battery units one by one, and each of the second guide channels is connected to the outside through the second heat dissipation ports; The plurality of first battery cells correspond to the plurality of second battery cells one by one, and the first battery cells and the second battery cells are connected in series; A plurality of second protrusions are provided in the second flow guiding channel, and the plurality of second protrusions divide the second flow guiding channel into a plurality of second sub-channels; The seat body comprises a front side plate, a rear side plate, a left side plate, a right side plate, an upper side plate and a lower side plate; the front side plate, the rear side plate, the left side plate, the right side plate, the upper side plate and the lower side plate enclose the predetermined space; a plurality of the first battery bodies are respectively mounted on the lower side plate, a plurality of the second battery bodies are respectively mounted on the lower side plate, and the fan is arranged in the predetermined space and mounted on the upper side plate; A plurality of the first heat dissipation openings are arranged on the front side plate, and a plurality of the second heat dissipation openings are arranged on the rear side plate; An opening direction of the first groove is opposite to an opening direction of the second groove.

2. The lithium battery pack according to claim 1, characterized in that: Each of the first battery bodies is a columnar structure with a rectangular cross section, and each of the second battery bodies is a columnar structure with a rectangular cross section; In each of the first battery cells, the first heat generating surface is formed on a predetermined side surface of the first battery body; in each of the second battery cells, the second heat generating surface is formed on a predetermined side surface of the second battery body; The plurality of first heating surfaces are parallel to each other, and the plurality of second heating surfaces are parallel to each other; A plurality of the first battery cells are arranged at intervals along a predetermined direction, and a plurality of the second battery cells are arranged at intervals along the predetermined direction.

3. The lithium battery pack according to claim 2, characterized in that: The first grooves are arc-shaped grooves, one end of each of the first grooves faces the air outlet of the fan, and the other end of each of the first grooves faces the first heat dissipation outlet; The plurality of second grooves are arc-shaped grooves, one end of each of the second grooves faces the air outlet of the fan, and the other end of each of the second grooves faces the second heat dissipation outlet.

4. The lithium battery pack according to claim 1, characterized in that: A heat-conducting adhesive is applied between the first heating surface and the first predetermined surface, and a heat-conducting adhesive is applied between the second heating surface and the second predetermined surface.

5. The lithium battery pack according to claim 1, characterized in that: A plurality of the first battery cells are connected in parallel, and a plurality of the second battery cells are connected in parallel.

6. The lithium battery pack according to claim 1, characterized in that: The fan is provided in plurality.

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