Battery pack

Abstract

The utility model provides a battery pack which comprises a battery pack and a box body, the box body comprises a bottom plate, the battery pack is arranged on the bottom plate, the battery pack at least comprises a first battery row and a second battery row which are arranged in the direction perpendicular to the bottom plate, and each of the first battery row and the second battery row at least comprises two stacked cylindrical batteries. The stacking direction of the cylindrical batteries is perpendicular to the axial direction of the cylindrical batteries; a partition plate is arranged between the first battery row and the second battery row, the first battery row is arranged at the upper part of the partition plate, and the second battery row is arranged at the lower part of the partition plate; a gap is formed between the side wall of the cylindrical battery arranged at the end of the second battery row and the box body, and a heat insulation piece is further arranged in the gap and attached to the side wall of the cylindrical battery arranged at the end of the second battery row. The battery pack can keep the temperature of the battery pack stable, and the overall service life of the battery pack is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of battery manufacturing technology, and specifically relates to a battery pack. Background Technology

[0002] In the field of battery technology, multi-layer layout structure design is often adopted to improve the space utilization and energy density of battery packs. However, in the multi-layer layout structure, for cylindrical battery packs, the geometric characteristics of their circular cross-section make it difficult to achieve a tight and orderly stacking in the layer space similar to that of prismatic batteries. Cylindrical battery packs usually adopt a staggered arrangement to optimize the space occupied.

[0003] Currently, in the multi-layer arrangement structure of cylindrical batteries, the cylindrical batteries at the beginning and end of the battery pack are prone to being suspended due to the arrangement method. Because of the lack of surrounding shielding from adjacent batteries, part of the outer surface of these batteries is directly exposed to the internal cavity of the battery pack, forming a large heat dissipation or heat-receiving surface, which is not conducive to the stability of the battery pack temperature. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a battery pack that can reduce heat conduction, maintain the temperature stability of the battery pack, and avoid the phenomenon that the safety of the battery pack is reduced due to excessive local temperature difference.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A battery pack includes a battery assembly and a housing. The housing includes a base plate, and the battery assembly is placed on the base plate. The battery assembly includes at least a first battery bar and a second battery bar arranged in a direction perpendicular to the base plate. Both the first battery bar and the second battery bar include at least two stacked cylindrical batteries, and the stacking direction of the cylindrical batteries is perpendicular to the axial direction of the cylindrical batteries.

[0007] A partition plate is provided between the first battery pack and the second battery pack, with the first battery pack disposed on the upper part of the partition plate and the second battery pack disposed on the lower part of the partition plate;

[0008] There is a gap between the side wall of the cylindrical battery located at the end of the second battery pack and the housing. A heat insulation component is also provided in the gap, and the heat insulation component is in contact with the side wall of the cylindrical battery at the end of the second battery pack.

[0009] As can be seen from the above technical solutions, compared with the prior art, the battery pack disclosed in this utility model embodiment not only significantly reduces the heat transfer efficiency from the battery pack to the housing, but also effectively blocks the heat input from the housing to the battery pack. Therefore, the battery pack can maintain the temperature stability of the battery pack, avoid the phenomenon of reduced safety due to excessive local temperature difference of the battery pack, and thus improve the overall life of the battery pack. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0011] Figure 1 This is a partial structural diagram of the battery pack disclosed in the embodiment of this utility model.

[0012] Explanation of reference numerals in the attached figures:

[0013] 100-First battery pack,

[0014] 200 - Second battery pack,

[0015] 300-Divider,

[0016] 400 - Thermal insulation. Detailed Implementation

[0017] In view of this, the purpose of this utility model is to provide a battery pack that can reduce heat conduction, maintain the temperature stability of the battery pack, and avoid the phenomenon that the safety of the battery pack is reduced due to excessive local temperature difference.

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0019] Please refer to Figure 1The battery pack disclosed in this embodiment of the utility model includes a battery pack and a housing. The housing includes a bottom plate, and the battery pack is mounted on the bottom plate. The battery pack includes at least a first battery bar 100 and a second battery bar 200 arranged in a direction perpendicular to the bottom plate. Each of the first battery bar 100 and the second battery bar 200 includes at least two stacked cylindrical batteries. The stacking direction of the cylindrical batteries is perpendicular to the axial direction of the cylindrical batteries.

[0020] A partition plate 300 is provided between the first battery pack 100 and the second battery pack 200. The first battery pack 100 is located on the upper part of the partition plate 300, and the second battery pack 200 is located on the lower part of the partition plate 300. There is a gap between the side wall of the cylindrical battery at the end of the second battery pack 200 and the casing. A heat insulation component 400 is also provided in the gap. The heat insulation component 400 is in contact with the side wall of the battery at the end of the second battery pack 200.

[0021] Compared with the prior art, the battery pack disclosed in this embodiment of the present invention has a heat insulation component 400 that can not only significantly reduce the heat conduction efficiency from the battery pack to the housing, but also effectively block the heat input from the housing to the battery pack. Therefore, the battery pack can maintain the temperature stability of the battery pack and avoid the phenomenon of reduced safety due to excessive local temperature difference of the battery pack, thereby improving the overall life of the battery pack.

[0022] It should be noted that, in the specific arrangement of cylindrical batteries in the first battery pack 100 and the second battery pack 200 disclosed in this utility model embodiment, any cylindrical battery in the first battery pack 100 is disposed between any two adjacent cylindrical batteries in the second battery pack 200.

[0023] It should be noted that the first battery pack 100 and the second battery pack 200 disclosed in this utility model embodiment both include two ends. The gap structure between the two ends and the housing may be the same or different, and the heat insulation component 400 may be adapted to the change of the gap structure.

[0024] This embodiment of the utility model does not limit the specific arrangement of the heat insulation component 400. Any arrangement that meets the usage requirements of this utility model is within the protection scope of this utility model.

[0025] The heat insulation element 400 extends from one end of the cylindrical battery toward the other along the axial direction of the cylindrical battery.

[0026] As a specific embodiment of the present invention, the length of the heat insulation component 400 disclosed in the present invention embodiment is 50% to 100% of the length of the cylindrical battery.

[0027] As one embodiment of the present invention, the length of the heat insulation member 400 disclosed in this embodiment of the present invention is 100% of the length of the cylindrical battery. This structure allows the heat insulation member 400 to completely block the side wall of the cylindrical battery located at the end of the second battery pack 200. Therefore, this arrangement can minimize the heat conduction efficiency between the cylindrical battery at the end of the second battery pack and the inner cavity of the box.

[0028] Of course, as a second embodiment of this utility model, the length of the heat insulation member 400 disclosed in this embodiment is less than 100% and greater than or equal to 50% of the length of the cylindrical battery. For example, the length of the heat insulation member 400 is 60%, 70%, or 80% of the length of the cylindrical battery. In this arrangement, the heat insulation member 400 does not completely block the side wall of the cylindrical battery at the end of the second battery pack 200. Compared with the previous embodiment, the heat conduction efficiency between the cylindrical battery at the end of the second battery pack and the inner cavity of the casing is improved in this embodiment, and those skilled in the art can select according to actual needs.

[0029] For example, when the battery is in a high-rate discharge or fast-charging state, the heat increases. At this time, the unshielded cylindrical battery sidewall of the heat insulation component 400 can act as a "heat dissipation window" to quickly dissipate heat through air convection or contact with heat-conducting components (such as liquid cooling plates), avoiding excessive local temperature rise caused by full shielding. In low-temperature environments, the shielded part can block the influence of low ambient temperature on the cylindrical battery (such as cold air from the outside in winter being conducted through the casing), while the unshielded area has a smaller area and controllable heat loss. Therefore, the temperature of the battery pack can be further balanced.

[0030] As a further embodiment, the positive and negative output terminals of the cylindrical battery disclosed in this utility model embodiment are located at one end in the axial direction of the cylindrical battery, and the heat insulation component 400 is located on the side away from the output terminal of the cylindrical battery, and its length accounts for 50% to 80%. For example, the heat insulation component 400 can account for 60%, 70%, or 75% of the length of the cylindrical battery. This arrangement not only insulates the non-output terminals of the cylindrical battery, but also avoids the phenomenon of thermal runaway caused by overheating of the output terminal due to simultaneously wrapping the output terminal and the non-output terminal of the battery.

[0031] The heat insulation component 400 disclosed in this embodiment can be made of flexible material or rigid material. When the heat insulation component 400 is made of flexible material, heat insulation foam or expanding foam can be used. Specifically, the heat insulation component is filled into the gap. The heat insulation foam or expanding foam can wrap the side wall of the battery at the end of the second battery pack. When the heat insulation component 400 is made of rigid material, the surface of the heat insulation component 400 that contacts the side wall of the battery at the end of the second battery pack can be set as an arc-shaped surface that conforms to the shape of the cylindrical battery, thus achieving the same effect of wrapping the side wall of the battery at the end of the second battery pack.

[0032] The present invention does not limit the specific structure of the partition plate 300. The partition plate 300 can be a horizontal plate or a bent plate. Those skilled in the art can choose according to actual needs.

[0033] As one embodiment of this utility model, the separator 300 disclosed in this embodiment is a horizontal plate, wherein the horizontal plate includes at least a first extension end and a second extension end. The first extension end extends along the axial direction of the battery, and the extension direction of the second extension end is perpendicular to the extension direction of the first extension end. The second extension end extends into the gap, and the heat insulation member 400 is connected to the second extension end. With this configuration, the heat insulation member 400 is connected to the separator 300, which can further improve the stability of the entire battery pack.

[0034] As another embodiment of the present utility model, the partition plate 300 disclosed in this embodiment of the present utility model includes a horizontal plate and a vertical plate. One end of the vertical plate is connected to the horizontal plate at a preset angle, and the other end is connected to the bottom surface of the box. The horizontal plate includes at least a first extension end and a second extension end. The first extension end extends along the axial direction of the battery, and the extension direction of the second extension end is perpendicular to the extension direction of the first extension end. The second extension end extends into the gap, and the vertical plate is connected to the second extension end. A cavity is formed between the second extension end, the vertical plate and the battery, and the heat insulation member 400 is disposed in the cavity.

[0035] Since the separator 300 is usually made of metal, it is easy for heat to be conducted between the battery and the separator 300. Therefore, the setting of the heat insulation component 400 can effectively reduce heat conduction. In addition, the connection between the separator 300 and the bottom of the box can further improve the stability of the connection between the separator, the box and the battery pack.

[0036] This embodiment of the utility model does not specifically limit the extension length of the first extension end. Any extension length that meets the protection scope of this utility model is within the protection scope of this utility model. Those skilled in the art can make the selection according to the actual situation.

[0037] As one embodiment of the present invention, the first extension end disclosed in the present invention can extend to the end of the cylindrical battery. With this configuration, the heat insulation member 400 fills the entire cavity, which can minimize heat conduction.

[0038] Of course, in another embodiment of this utility model, the first extension end may also have a predetermined distance from the end of the cylindrical battery. With this arrangement, the heat insulation member 400 can partially fill the cavity.

[0039] It should be noted that the first extension end and the second extension end disclosed in the embodiments of this utility model are both two. The first extension end extends along the axial direction of the battery and in opposite directions. The extension direction of the second extension end is perpendicular to the extension direction of the first extension end, and the extension directions of the two second extension ends are opposite.

[0040] This embodiment of the utility model does not limit the heat insulation coefficient of the heat insulation component 400. Any heat insulation coefficient that meets the requirements of this utility model is within the protection scope of this utility model.

[0041] As a specific embodiment, the thermal insulation coefficient of the thermal insulation component 400 disclosed in this utility model embodiment is 0.01 W / (m·K) to 0.07 W / (m·K). For example, the thermal insulation coefficient of the thermal insulation component 400 may be 0.02 W / (m·K), 0.03 W / (m·K) or 0.05 W / (m·K).

[0042] This embodiment of the utility model does not limit the specific type of the partition plate 300. The partition plate 300 can be a support plate, a thermally conductive and insulating plate, or a cold plate. Those skilled in the art can choose according to actual needs.

[0043] This embodiment of the invention does not limit the specific structure of the separator 300. The separator 300 can be a serpentine plate or a straight plate. Both structures have their advantages and disadvantages, and those skilled in the art can choose according to the actual situation. Specifically, the serpentine plate can better fix the battery, while the straight plate has a poorer fixing effect but is easier to process and install.

[0044] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the term "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0045] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0046] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery pack, comprising a battery assembly and a housing, the housing including a base plate, the battery assembly being placed on the base plate, characterized in that, The battery pack includes at least a first battery pack and a second battery pack arranged in a direction perpendicular to the base plate. Both the first battery pack and the second battery pack include at least two stacked cylindrical batteries. The stacking direction of the cylindrical batteries is perpendicular to the axis of the cylindrical batteries. A partition plate is provided between the first battery pack and the second battery pack, with the first battery pack disposed on the upper part of the partition plate and the second battery pack disposed on the lower part of the partition plate; There is a gap between the side wall of the cylindrical battery located at the end of the second battery pack and the housing. A heat insulation component is also provided in the gap, and the heat insulation component is in contact with the side wall of the cylindrical battery at the end of the second battery pack.

2. The battery pack according to claim 1, characterized in that, The heat insulation element extends along the axial direction of the cylindrical battery from one end of the cylindrical battery toward the other end.

3. The battery pack according to claim 2, characterized in that, The length of the heat insulation component is 50% to 100% of the length of the cylindrical battery.

4. The battery pack according to claim 1, characterized in that, The positive and negative output terminals of the cylindrical battery are located at one end in the axial direction of the cylindrical battery, and the heat insulation component is located on the side away from the output terminal of the cylindrical battery, with a length ratio of 50% to 80%.

5. The battery pack according to claim 1, characterized in that, The separator is a horizontal plate, which includes at least a first extension end and a second extension end. The first extension end extends along the axial direction of the cylindrical battery, and the extension direction of the second extension end is perpendicular to the extension direction of the first extension end. The second extension end extends into the gap, and the heat insulation element is connected to the second extension end.

6. The battery pack according to claim 1, characterized in that, The partition plate includes a horizontal plate and a vertical plate. One end of the vertical plate is connected to the horizontal plate at a preset angle, and the other end is connected to the bottom surface of the box. The horizontal plate includes at least a first extension end and a second extension end, the first extension end extending along the axial direction of the battery, and the extension direction of the second extension end being perpendicular to the extension direction of the first extension end. The second extension end extends into the gap, the vertical plate is connected to the second extension end, a cavity is formed between the second extension end, the vertical plate and the battery, and the heat insulation element is disposed in the cavity.

7. The battery pack according to claim 5 or 6, characterized in that, The first extension extends to the end of the cylindrical battery.

8. The battery pack according to claim 5 or 6, characterized in that, The first extension end has a predetermined distance from the end of the cylindrical battery.

9. The battery pack according to claim 1, characterized in that, The thermal insulation coefficient of the insulation component is 0.01 W / (m·K) to 0.07 W / (m·K).

10. The battery pack according to claim 1, characterized in that, The partition plate is either a serpentine plate or a straight plate.

Images