Battery pack

Abstract

The utility model discloses a battery pack, which belongs to the technical field of battery packs and comprises a cooling component, an electrical element and a first battery pack, and the first battery pack comprises a plurality of first single batteries; the first battery cells have sizes in three directions and are stacked in a first direction; the cooling part is at least attached to the outside of the side surface of the first battery monomer in the first battery pack in the second direction; wherein the electrical element is at least arranged outside the top surface of the first battery cell in the first battery pack in the third direction. According to the utility model, the cooling plates are arranged on the two side surfaces of the battery monomer, so that the cooling contact area is increased and the heat dissipation efficiency is improved; and a double-row battery pack structure is formed by connecting the bottoms of the first battery monomers and the second battery monomers, and the grouping mode is optimized, so that the energy density of the battery pack is improved.

Description

Technical Field

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

[0002] As an energy storage device, battery packs are widely used in electric vehicles and hybrid vehicles. Battery packs are used to store and provide electrical energy, but due to their large amount of energy storage and release process, a large amount of heat will be generated, and this heat will have a certain impact on the life and performance of the battery pack. Therefore, the heat dissipation of power batteries is particularly important. With the rapid development of the new energy industry, in the field of small power batteries, the requirements for the endurance, energy density and thermal management capabilities of small power battery packs are becoming higher and higher, which also brings about an increase in the demand for fast charging of small power battery packs.

[0003] In the prior art, the common battery design method is to put a single row of battery modules into a box or to use a double row of modules into a box to improve the energy density of the battery pack. After the battery module is put into the box, in order to improve the thermal management ability of the battery pack, a cooling plate is usually designed at the bottom of the box to contact the bottom of the battery cell to achieve the purpose of heat dissipation. For example, the Chinese patent with document number CN219226448U discloses a double-row large module battery pack, the box of which is composed of a box bottom plate and a box cover covered on the box bottom plate, an integrated liquid cooling pipeline is arranged in the box bottom plate, and multiple double-row battery modules are arranged in sequence from one end to the other end in the box, and a BMS bracket is arranged between adjacent double-row battery modules. A panel installation window is opened on the end wall of one end of the box cover, and an electrical panel is arranged on the panel installation window. The electrical panel is connected to the adjacent double-row battery modules in the box through a copper busbar for controlling the double-row battery modules. This solution uses a double-row large module with a higher degree of integration to improve strength and save materials compared to two single modules. However, the problem with this solution is that the cooling plate of the battery module can only cool the battery cell from the bottom surface. This cooling method has a low cooling efficiency and is difficult to meet the requirements of rapid and uniform cooling of the battery cell.

[0004] In addition, the small power battery packs currently widely used in two-wheeled vehicles are prone to fire during charging, which can easily lead to serious casualties and property losses. With the increase in production capacity and the reduction in costs of the power battery industry, it is possible for battery cells above the automotive grade to be used in two-wheeled vehicles as small power battery packs, but there is no mature product design yet. Utility Model Content

[0005] In view of the problems existing in the above-mentioned prior art, the present invention provides a battery pack, which is intended to solve the problems of low heat dissipation efficiency and poor heat dissipation effect of the existing battery module. To achieve the above-mentioned purpose, the present invention provides the following technical solutions:

[0006] A battery pack includes a cooling component, an electrical component and a first battery group, wherein the first battery group includes a plurality of first battery cells; the first battery cells have dimensions in three directions and are stacked in the first direction; the cooling component is at least attached to the outside of the side surfaces in the second direction of the first battery cells in the first battery group; wherein the electrical component is at least arranged outside of the top surfaces in the third direction of the first battery cells in the first battery group.

[0007] Furthermore, it includes a second battery group; the second battery group includes a plurality of second battery cells; the second battery cells have dimensions in three directions and are stacked in a first direction; wherein the second battery cells in the second battery group are stacked with the first battery cells in the first battery group in a third direction, so that the cooling component is arranged against the outside of the side surfaces of the first battery cell and the second battery cell in the second direction.

[0008] Furthermore, the top surface of the first battery cell and the top surface of the second battery cell face oppositely; and the electrical component is also arranged at least outside the top surface of the second battery cell in the second battery pack in the third direction.

[0009] Further, in the third direction, the top surface of the first battery cell and the top surface of the second battery cell are far away from each other, and the bottom surface of the first battery cell and the bottom surface of the second battery cell are close to each other.

[0010] Furthermore, the cooling component is provided with an inlet and an outlet; the cooling component is provided with a cooling channel for coolant to flow in from the inlet and flow out from the outlet; the cooling channel includes a first channel and a second channel; the first channel is a meander channel; the second channel is an S-shaped channel; the inlet, the first channel, the second channel and the outlet are connected in sequence.

[0011] Furthermore, the electrical component also includes a busbar component; two of the busbar components are respectively arranged on the top surface of the first battery cell and the second battery cell; the two busbar components are respectively used to connect and conduct a plurality of first battery cells in the first battery group and a plurality of second battery cells in the second battery group.

[0012] Furthermore, it also includes a jumper busbar; the jumper busbar is connected to the two busbar components and is used to connect and conduct the first battery group and the second battery group.

[0013] Furthermore, it also includes an insulating plate; the insulating plate is located outside the side surfaces of the first battery group and the second battery group in the third direction.

[0014] Furthermore, at least one side of the first battery pack along the first direction is provided with a buffer foam; and at least one side of the second battery pack along the first direction is provided with a buffer foam.

[0015] Furthermore, it also includes a box body, the cooling component is a cooling plate, and the cooling plate constitutes a side plate of the box body; the battery pack is a small power battery pack; the first battery cell and the second battery cell are square aluminum shell batteries.

[0016] The beneficial effects of the utility model are:

[0017] 1. The utility model provides a battery pack, which increases the cooling contact area and improves the heat dissipation efficiency by arranging cooling plates on both sides of the battery cells; and reasonably optimizes the flow path of the coolant in the cooling plate, so that the cooling plate can evenly dissipate heat for all the battery cells in the battery pack, thereby improving the safety performance of the small power battery pack.

[0018] 2. The utility model provides a battery pack, including a first battery group and a second battery group, and a double-row battery pack structure is formed by connecting the first battery cell and the second battery cell at the bottom, thereby optimizing the grouping method and improving the energy density of the battery pack.

[0019] 3. The utility model provides a battery pack that uses automotive-grade battery cells and is designed with CTP technology. The overall battery pack process has no process difficulties and is easy to achieve mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is an exploded diagram of a battery pack provided by the utility model;

[0021] Figure 2 This is a schematic diagram of installing a battery pack into a shell provided by the utility model;

[0022] Figure 3 This is a top view of a battery pack provided by the utility model;

[0023] In the accompanying drawings: 1-first battery cell, 2-second battery cell, 3-cooling plate, 4-inlet, 5-outlet, 6-first flow channel, 7-second flow channel, 8-bus component, 9-jumper bus, 10-insulating plate, 11-buffer foam, 12-shell body, 13-upper cover, 14-fixing beam, 15-first connecting layer, 16-third connecting layer. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods, but the present invention is not limited to the following embodiments.

[0025] Embodiment 1:

[0026] See attached Figures 1 to 3 . A battery pack includes a cooling component, an electrical component and a first battery group, wherein the first battery group includes a plurality of first battery cells 1; the first battery cells 1 have dimensions in three directions and are stacked in the first direction; the cooling component is at least attached to the outside of the side surface of the first battery cell 1 in the second direction in the first battery group; wherein the electrical component is at least arranged outside the top surface of the first battery cell 1 in the third direction in the first battery group. As can be seen from the above structure, this embodiment provides a battery pack, including a cooling component, an electrical component and a first battery group, wherein the first battery group includes a plurality of first battery cells 1, wherein the first battery cell 1 includes two first side surfaces arranged oppositely in the first direction, two second side surfaces arranged oppositely in the second direction, and a top surface and a bottom surface arranged oppositely in the third direction, and the first direction, the second direction and the third direction are perpendicular to each other, preferably, the first direction is along the thickness direction of the first battery cell 1, the second direction is along the length direction of the first battery cell 1, and the third direction is along the height direction of the first battery cell 1. Preferably, the first battery cell 1 is a square aluminum shell battery, and the battery pack is a small power battery pack. The top surfaces of several first battery cells 1 face the same direction and are stacked in the first direction. For example, adjacent first battery cells 1 can be adhered by a first connecting layer 15, and the first connecting layer 15 can be a PC sheet, foam or glue. Cooling components are respectively arranged on the two second side surfaces of the first battery cells 1, and the two second side surfaces of all the first battery cells 1 in the first battery pack are in contact with two cooling components. The cooling components are used to dissipate heat for the first battery pack, and the cooling components can be liquid cooling plates. Electrical components are also arranged outside the top surface of the first battery cell 1 in the third direction, and the electrical components are connected to the first battery cell 1. The first battery cells 1 are connected to form a first battery pack, and the cooling components are arranged on the side surfaces of the first battery cells 1 to form the side panels of the battery pack, and finally are put into the shell to form the battery pack. The battery pack provided by the utility model increases the cooling contact area by arranging cooling components on the two second side surfaces of the first battery cell 1, thereby providing heat dissipation capability of the battery pack.

[0027] Embodiment 2:

[0028] See attached Figures 1 to 3. On the basis of the first embodiment, it also includes a second battery group; the second battery group includes a plurality of second battery cells 2; the second battery cells 2 have dimensions in three directions and are stacked in the first direction; wherein the second battery cells 2 in the second battery group are stacked with the first battery cells 1 in the first battery group in the third direction, so that the cooling component is arranged against the outside of the side surfaces of the first battery cells 1 and the second battery cells 2 in the second direction. As can be seen from the above structure, this embodiment provides a battery pack with a double-row battery group structure, including a first battery group and a second battery group, the second battery group includes a plurality of second battery cells 2, the second battery cells 2 have the same structure as the first battery cells 1, and the second battery cells 2 are stacked with the first battery cells 1 in the third direction. Two cooling components are also respectively attached to the two second side surfaces of the second battery cells 2, and the two second side surfaces of all the second battery cells 2 in the second battery group are in contact with the two cooling components, and the cooling components are used to dissipate heat for the first battery group and the second battery group at the same time.

[0029] The top surface of the first battery cell 1 and the top surface of the second battery cell 2 face oppositely; the electrical component is also arranged outside the top surface of the second battery cell 2 in the third direction in at least the second battery pack. As can be seen from the above structure, the first battery pack and the second battery pack are stacked to form a battery pack with a double-row battery pack structure. In the specific arrangement, the top surface of the first battery cell 1 and the top surface of the second battery cell 2 face oppositely, and the first battery pack and the second battery pack are stacked in the third direction. This grouping method can effectively improve the volume energy density of the battery pack. Electrical components are also arranged outside the top surface of the second battery cell 2 in the third direction, and the electrical components are connected to the second battery cell 2.

[0030] In the third direction, the top surface of the first battery cell 1 and the top surface of the second battery cell 2 are far away from each other, and the bottom surface of the first battery cell 1 and the bottom surface of the second battery cell 2 are close to each other. It can be seen from the above structure that when the first battery pack and the second battery pack are stacked in the third direction, specifically, the top surface of the first battery cell 1 and the top surface of the second battery cell 2 are both facing outward, and the bottom surface of the first battery cell 1 and the bottom surface of the second battery cell 2 are close to each other. Preferably, the first battery cell 1 and the second battery cell 2 correspond to each other one by one. Figure 1As shown, adjacent first battery cells 1 can be adhered by a first connection layer 15, adjacent second battery cells 2 can be adhered by a first connection layer 15, and the first battery pack and the second battery pack can be adhered by a third connection layer 16, and the third connection layer 16 can be a bottom foam. The utility model forms a double-row battery pack structure by adhering the first battery cell 1 and the second battery cell 2 at the bottom, optimizes the grouping method, and not only improves the energy density of the battery pack; at the same time, by arranging cooling components on the two second sides of the first battery cell 1 and the second battery cell 2, the cooling contact area is increased and the heat dissipation efficiency is improved.

[0031] Embodiment three:

[0032] See attached Figures 1 to 3 . On the basis of the second embodiment, the cooling component is provided with an inlet 4 and an outlet 5; the cooling component is provided with a cooling channel for the coolant to flow in from the inlet 4 and out from the outlet 5; the cooling channel includes a first channel 6 and a second channel 7; the first channel 6 is a meandering channel; the second channel 7 is an S-shaped channel; the inlet 4, the first channel 6, the second channel 7 and the outlet 5 are connected in sequence. It can be seen from the above structure that the cooling component is used to dissipate heat for the first battery pack and the second battery pack. Specifically, the cooling component is provided with an inlet 4, an outlet 5 and a cooling channel, and the two ends of the cooling channel are respectively connected to the inlet 4 and the outlet 5. Preferably, the inlet 4 and the outlet 5 are arranged on the same side of the cooling component. A circulating pump and a radiator can also be connected outside the inlet 4 or the outlet 5. During operation, the coolant flows into the cooling channel from the inlet 4 and finally flows out from the outlet 5. During the flow process, the coolant takes away the heat generated by the battery pack, thereby dissipating heat for the battery pack. For example, the cooling component is a cooling plate 3, the cooling plate 3 is a liquid cooling plate, and the coolant is cooling water. Figure 1 As shown, the cooling channel includes a first channel 6 and a second channel 7 connected in sequence from end to end. The first channel 6 is a meandering channel arranged around the periphery of the cooling plate 3, and the second channel 7 is an S-shaped channel. According to general thermodynamics, the electrolyte of the battery cell flows upward after being heated, so that the temperature of the top surface of the battery cell is always higher than the bottom surface of the battery cell. After the coolant flows into the first channel 6 through the inlet 4, since the first channel 6 is arranged on the periphery of the cooling plate 3, and the top surfaces of the first battery cell 1 and the second battery cell 2 are arranged outward, when the coolant flows along the first channel 6, it first dissipates heat to the top surfaces of the first battery cell 1 and the second battery cell 2, and then dissipates heat to the remaining positions of the first battery cell 1 and the second battery cell 2 through the S-shaped second channel 7, thereby achieving uniform heat dissipation of the battery pack.

[0033] The electrical component also includes a busbar component 8; two busbar components 8 are respectively arranged on the top surface of the first battery cell 1 and the second battery cell 2; the two busbar components 8 are respectively used to connect and conduct a plurality of first battery cells 1 in the first battery group and a plurality of second battery cells 2 in the second battery group. It can be seen from the above structure that a plurality of first battery cells 1 in the first battery group are connected in series through a busbar component 8, and a plurality of second battery cells 2 in the second battery group are connected in series through a busbar component 8. Among them, an output port is provided at one end of the busbar component 8, and the output port is electrically connected to the busbar component 8 for outputting current or electrical signals. Preferably, the output port is arranged on the same side as the inlet 4 and the outlet 5. The shape and size of the busbar component 8 can be adjusted according to specific circumstances.

[0034] It also includes a jumper busbar 9; the jumper busbar 9 is connected to the two busbar components 8, and is used to connect the first battery group and the second battery group. From the above structure, it can be seen that by setting the jumper busbar 9, the two ends of the jumper busbar 9 are respectively connected to a busbar component 8, so that the first battery group and the second battery group are connected in series to form a double-row battery group structure.

[0035] The first battery pack and the second battery pack also include an insulating plate 10; the insulating plate 10 is located outside the side of the first battery pack and the second battery pack in the third direction. Figure 1 and Figure 2 As shown, by arranging insulating plates 10 on the outermost sides of the first battery pack and the second battery pack along the third direction, in the third direction, the battery pack can be insulated and isolated from the shell after being put into the shell, and the series welding surfaces of the first battery pack and the second battery pack can be effectively insulated and protected. The insulating plate 10 can be an insulating PC board.

[0036] On both sides of the first battery pack along the first direction, at least one side is provided with a buffer foam 11; on both sides of the second battery pack along the first direction, at least one side is provided with a buffer foam 11. Figure 1 As shown, by arranging the buffer foam 11 on both sides of the first battery pack and the second battery pack along the first direction, the battery pack can be insulated and isolated from the shell after being put into the shell in the first direction.

[0037] It also includes a box, the cooling component is a cooling plate 3, and the cooling plate 3 constitutes the side plate of the box; the battery pack is a small power battery pack; the first battery cell 1 and the second battery cell 2 are square aluminum shell batteries. From the above structure, it can be seen that the first battery pack and the second battery pack are connected to form a double-row battery pack and then put into the shell to form a battery pack, and the cooling plate 3 is attached to the side of the first battery cell 1 and the second battery cell 2, and the cooling plate 3 constitutes the side plate of the box. Figure 2 and Figure 3As shown, the housing may include a housing body 12 with an open top, and an upper cover 13 detachably connected to the open top of the housing body 12; the housing body 12 includes a housing bottom wall and a housing side wall surrounding the housing bottom wall. A fixing beam 14 may also be provided on the housing side wall, and the space enclosed by the fixing beam 14 and the housing side wall may be used to place and install the electrical assembly.

[0038] When the battery pack is assembled, the shell is filled with potting glue to ensure the fastening of the battery pack and the shell; when the battery pack is put into the shell, the battery pack can be clamped into the shell by the restraint tooling, and after the clamping claws are released, the battery pack expands along the first direction and is restrained and fixed with the fixed beam 14 and the side wall of the shell; after the electrical assembly is installed, the upper cover 13 is installed to complete the assembly of the battery pack. The battery pack provided by the utility model has no process difficulties and is easy to achieve mass production.

[0039] It should be understood that the first battery pack and the second battery pack may be CTP (Cell To Pack) battery packs without a module design formed by square aluminum shell batteries.

[0040] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A battery pack, characterized in that: The invention comprises a cooling component, an electrical component and a first battery group, wherein the first battery group comprises a plurality of first battery cells (1); the first battery cells (1) have dimensions in three directions and are stacked in the first direction; the cooling component is at least arranged in contact with the outside of the side surface of the first battery cells (1) in the first battery group in the second direction; wherein the electrical component is at least arranged in contact with the outside of the top surface of the first battery cells (1) in the first battery group in the third direction.

2. A battery pack according to claim 1, characterized in that: The invention also comprises a second battery group; the second battery group comprises a plurality of second battery cells (2); the second battery cells (2) have dimensions in three directions and are stacked in a first direction; wherein the second battery cells (2) in the second battery group are stacked with the first battery cells (1) in the first battery group in a third direction, so that the cooling component is arranged close to the outside of the side surfaces of the first battery cells (1) and the second battery cells (2) in the second direction.

3. A battery pack according to claim 2, characterized in that: The top surface of the first battery cell (1) and the top surface of the second battery cell (2) face oppositely; the electrical component is also arranged at least outside the top surface of the second battery cell (2) in the third direction in the second battery pack.

4. A battery pack according to claim 3, characterized in that: In the third direction, the top surface of the first battery cell (1) and the top surface of the second battery cell (2) are away from each other, and the bottom surface of the first battery cell (1) and the bottom surface of the second battery cell (2) are close to each other.

5. A battery pack according to claim 1, characterized in that: The cooling component is provided with an inlet (4) and an outlet (5); the cooling component is provided with a cooling channel for coolant to flow in from the inlet (4) and out from the outlet (5); the cooling channel comprises a first channel (6) and a second channel (7); the first channel (6) is a meander channel; the second channel (7) is an S-shaped channel; the inlet (4), the first channel (6), the second channel (7) and the outlet (5) are connected in sequence.

6. A battery pack according to claim 3, characterized in that: The electrical component further comprises a busbar component (8); two busbar components (8) are respectively arranged on the top surface of the first battery cell (1) and the second battery cell (2); the two busbar components (8) are respectively used to connect and conduct a plurality of first battery cells (1) in the first battery group and a plurality of second battery cells (2) in the second battery group.

7. A battery pack according to claim 6, characterized in that: It also comprises a jumper busbar (9); the jumper busbar (9) is connected to two busbar components (8) and is used to connect and conduct the first battery group and the second battery group.

8. A battery pack according to claim 2, characterized in that: It also includes an insulating plate (10); the insulating plate (10) is located outside the side surfaces of the first battery group and the second battery group in the third direction.

9. A battery pack according to claim 2, characterized in that: At least one side of the first battery pack along the first direction is provided with a buffer foam (11); at least one side of the second battery pack along the first direction is provided with a buffer foam (11).

10. A battery pack according to claim 2, characterized in that: It also comprises a box body, wherein the cooling component is a cooling plate (3), and the cooling plate (3) constitutes a side plate of the box body; the battery pack is a small power battery pack; the first battery cell (1) and the second battery cell (2) are square aluminum shell batteries.

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