Battery pack and energy storage system

Abstract

The utility model discloses a battery pack and an energy storage system. The battery pack comprises a shell, a battery cell assembly, a circuit board and a first heat insulation part, the shell comprises an upper cover and a lower shell, the lower shell and the upper cover are arranged in the first direction, the lower shell is provided with a containing space and an opening which are communicated with each other, and the upper cover is connected to the lower shell and covers the opening; the battery core assembly is arranged in the accommodating space; the circuit board is arranged in the containing space, the battery cell assembly is connected to the circuit board, the first heat insulation piece is arranged in the first direction, at least part of the first heat insulation piece is located between the circuit board and the upper cover, and the first heat insulation piece abuts against the circuit board and the upper cover. By means of the first heat insulation part, heat transferred to the upper cover from the battery core assembly and the circuit board can be reduced, the phenomenon that the temperature difference between the inside and the outside of the upper cover is too large is reduced, the probability that the upper cover generates condensation is reduced, and the influence on the battery pack is reduced.

Description

Technical Field

[0001] The embodiments of the utility model relate to the field of energy storage technology, and in particular to a battery pack and an energy storage system. Background Art

[0002] A battery pack refers to a device that can store and release energy. A battery pack usually includes a shell, a battery cell assembly, and a connection assembly. The battery cell assembly is fixed inside the shell through the connection assembly. During the operation of the battery cell assembly, the temperature of the battery cell assembly rises and the heat is transferred to the upper cover of the shell through the connection assembly. At the same time, since the upper cover is in contact with the outside air, there is a large temperature difference between the inside and outside of the upper cover, which can easily cause water vapor to condense on the surface inside the upper cover, thereby forming condensation. Due to the effect of its own gravity, condensation can easily drip into the battery cell assembly, damage the battery cell assembly or other key components, and affect the performance and life of the battery pack. Utility Model Content

[0003] The main technical problem solved by the embodiments of the utility model is to provide a battery pack and an energy storage system, which can reduce the heat transferred to the upper cover to reduce the probability of condensation on the upper cover.

[0004] In order to solve the above technical problems, a technical solution adopted in an embodiment of the utility model is: to provide a battery pack, including a shell, a battery cell assembly, a circuit board and a first thermal insulation member; the shell includes an upper cover and a lower shell, the lower shell and the upper cover are arranged along a first direction, the lower shell is provided with a receiving space and an opening that are interconnected, the upper cover is connected to the lower shell and covers the opening; the battery cell assembly is arranged in the receiving space; the circuit board is arranged in the receiving space, the battery cell assembly is connected to the circuit board, the first thermal insulation member is along the first direction, at least part of the first thermal insulation member is located between the circuit board and the upper cover, the first thermal insulation member abuts against the circuit board, and the first thermal insulation member abuts against the upper cover.

[0005] In one or more of the above optional embodiments, the first thermal insulation member is provided with a first groove, and part of the circuit board is arranged in the first groove.

[0006] In one or more of the above optional embodiments, the battery pack also includes a third thermal insulation member, which is arranged on the surface of the upper cover close to the battery cell assembly along the first direction; the third thermal insulation member is connected to the upper cover and the first thermal insulation member, the third thermal insulation member is abutted against the first thermal insulation member, and the thermal conductivity of the third thermal insulation member is smaller than the thermal conductivity of air.

[0007] In one or more of the above optional embodiments, the upper cover includes a connected protrusion and an extension, the protrusion protrudes from the extension in the opposite direction of the first direction, and the first thermal insulation member abuts against the extension; the protrusion is provided with a accommodating space, the battery pack includes an electronic module, and the electronic module is arranged in the accommodating space; the battery pack also includes a fourth thermal insulation member, the fourth thermal insulation member is connected between the protrusion and the battery cell assembly, and the thermal conductivity of the fourth thermal insulation member is less than the thermal conductivity of air.

[0008] In one or more of the above optional embodiments, along the first direction, the third thermal insulation member is provided on the surface of the extension portion facing the circuit board.

[0009] In one or more of the above optional embodiments, the lower shell includes a bottom wall, and along the first direction, the bottom wall and the upper cover are located on both sides of the battery cell assembly; the battery pack includes a second thermal insulation member, and along the first direction, at least part of the second thermal insulation member is located between the circuit board and the bottom wall, the second thermal insulation member abuts against the circuit board, and the second thermal insulation member abuts against the bottom wall.

[0010] In one or more of the above optional embodiments, the battery cell assembly includes a plurality of battery cells arranged along a first direction, each battery cell includes an electrode assembly, a battery cell shell, and an electrode terminal connected to the electrode assembly and led out from the battery cell shell, and the electrode terminal is connected to the circuit board; the battery cell shell includes a main body and a sealing portion, the electrode assembly is arranged in the main body, and the electrode terminal extends from the sealing portion to the main body; the circuit board includes a through opening, at least one electrode terminal is arranged on a side of the circuit board away from the main body after passing through the through opening, and part of the electrode terminal is exposed between the main body and the circuit board.

[0011] In one or more of the above optional embodiments, the thermal conductivity of the first thermal insulation member is smaller than the thermal conductivity of air.

[0012] In one or more of the above optional embodiments, the first thermal insulation element includes foam, and the first thermal insulation element is in a compressed state.

[0013] In order to solve the above technical problems, another technical solution adopted by the embodiment of the utility model is: to provide an energy storage system, including the above battery pack.

[0014] The beneficial effects of the embodiment of the utility model are as follows: Different from the prior art, the embodiment of the utility model provides a battery pack, including a shell, a battery cell assembly, a circuit board and a first thermal insulation member; the shell includes an upper cover and a lower shell, the lower shell and the upper cover are arranged along a first direction, the lower shell is provided with a receiving space and an opening that are interconnected, the upper cover is connected to the lower shell and covers the opening; the battery cell assembly is arranged in the receiving space; the circuit board is arranged in the receiving space, the battery cell assembly is connected to the circuit board, the first thermal insulation member is along the first direction, at least part of the first thermal insulation member is located between the circuit board and the upper cover, the first thermal insulation member abuts against the circuit board, and the first thermal insulation member abuts against the upper cover. Through the above-mentioned first thermal insulation member, it is possible to reduce the heat transfer from the battery cell assembly and the circuit board to the upper cover, thereby reducing the phenomenon of excessive temperature difference between the inside and outside of the upper cover, thereby reducing the probability of condensation on the upper cover, so as to reduce the impact on the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0016] Figure 1 It is a schematic diagram of the overall structure of the battery pack provided by the embodiment of the utility model;

[0017] Figure 2 It is an exploded view of the overall structure of the battery pack provided by the embodiment of the utility model;

[0018] Figure 3 It is a partial structural schematic diagram of a battery pack provided by an embodiment of the utility model;

[0019] Figure 4 yes Figure 2 A partial enlarged view of the middle A;

[0020] Figure 5 yes Figure 2 A partial enlarged view of point B in the middle.

[0021] Description of reference numerals:

[0022] 1 housing, 11 upper cover, 111 convex portion, 112 extension portion, 12 lower housing, 121 bottom wall, 122 first housing, 123 second housing, 2 battery cell assembly, 212 battery cell housing, 212a main body, 212b sealing portion, 213 electrode terminal, 3 circuit board, 30 opening, 31 first portion, 32 second portion, 4 first thermal insulation member, 41 first groove, 5 second thermal insulation member, 51 second groove, 6 third thermal insulation member, 7 fourth thermal insulation member, 8 fifth thermal insulation member;

[0023] X is the first direction, Y is the second direction, and Z is the third direction. DETAILED DESCRIPTION

[0024] In order to facilitate the understanding of the utility model, the utility model is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on another element or there can be one or more centered elements therebetween. When an element is described as "connected" to another element, it can be directly connected to another element or there can be one or more centered elements therebetween. The orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "vertical", "horizontal", etc. used in this specification is based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0025] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by technicians in the technical field of the present invention. The terms used in this specification are only for the purpose of describing specific embodiments and are not used to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.

[0026] See also Figure 1 and Figure 2 The utility model provides an embodiment of a battery pack, including a housing 1 and a battery cell assembly 2, wherein the housing 1 includes an upper cover 11 and a lower housing 12, and the lower housing 12 and the upper cover 11 are arranged along a first direction X. The lower housing 12 is provided with a receiving space and an opening that are interconnected, and the upper cover 11 is connected to the lower housing 12 and covers the opening. The battery cell assembly 2 is arranged in the receiving space.

[0027] In some embodiments, the battery pack includes a circuit board 3 , the circuit board 3 is disposed in the receiving space, and the battery cell assembly 2 is connected to the circuit board 3 .

[0028] In some embodiments, the battery pack includes a first heat insulating member 4, and along the first direction X, at least a portion of the first heat insulating member 4 is located between the circuit board 3 and the upper cover 11, the first heat insulating member 4 abuts against the circuit board 3, and the first heat insulating member 4 abuts against the upper cover 11. The first heat insulating member 4 provides a limiting effect on the circuit board 3 and the upper cover 11, so as to fix the circuit board 3 and the upper cover 11.

[0029] See also Figure 2 and Figure 3In some embodiments, the upper cover 11 includes a protrusion 111 and an extension 112 connected to each other, and the protrusion 111 protrudes from the extension 112 in the opposite direction of the first direction X. The first thermal insulation member 4 abuts against the extension 112. The extension 112 is configured to limit the movement of the battery cell assembly 2 in the first direction X.

[0030] In some embodiments, the convex portion 111 is provided with a receiving space (not shown in the figure), the battery pack includes an electronic module (not shown in the figure), and the electronic module (not shown in the figure) is arranged in the receiving space (not shown in the figure). In some embodiments, the electronic module includes a circuit board 3 and electronic components arranged in the receiving space.

[0031] See also Figure 2 and Figure 4 In some embodiments, the first thermal insulation member 4 is provided with a first groove 41, and a portion of the circuit board 3 is provided in the first groove 41. In the above manner, the circuit board 3 and the first thermal insulation member 4 are conveniently fixed. Optionally, the circuit board 3 is clamped to the first thermal insulation member 4. Optionally, the circuit board 3 is bonded to the first thermal insulation member 4.

[0032] In some embodiments, the thermal conductivity of the first thermal insulation member 4 is smaller than that of air, which reduces the heat of the battery cell assembly 2 transferred to the upper cover 11 through the first thermal insulation member 4 and reduces the condensation caused by the large temperature difference between the inner and outer surfaces of the upper cover 11.

[0033] In some embodiments, the first heat insulating member 4 includes foam, and the first heat insulating member 4 is in a compressed state, which can provide a limiting function for the circuit board 3 .

[0034] It should be understood that in other embodiments, the material of the first thermal insulation component 4 may also be configured to include but not limited to materials such as silicone or rubber.

[0035] See also Figure 2 and Figure 3 In some embodiments, the lower shell 12 includes a bottom wall 121, and along the first direction X, the bottom wall 121 and the upper cover 11 are located on both sides of the battery cell assembly 2. Optionally, the bottom wall 121 carries the battery cell assembly 2.

[0036] In some embodiments, the lower shell 12 includes a first shell 122 and a second shell 123 arranged along the third direction Z, and the bottom wall 121, the first shell 122 and the second shell 123 are connected to each other to enclose a receiving space.

[0037] In some embodiments, the battery pack includes a second thermal insulation member 5, and along the first direction X, at least a portion of the second thermal insulation member 5 is located between the circuit board 3 and the bottom wall 121, the second thermal insulation member 5 abuts against the circuit board 3, and the second thermal insulation member 5 abuts against the bottom wall 121. The second thermal insulation member 5 provides a limiting effect on the circuit board 3 and the bottom wall 121, so as to fix the circuit board 3 and the bottom wall 121.

[0038] See also Figure 2 and Figure 5 In some embodiments, the second thermal insulation member 5 is provided with a second groove 51, and part of the circuit board 3 is provided in the second groove 51. This is conducive to fixing the circuit board 3 and the second thermal insulation member 5. Optionally, the circuit board 3 is clamped to the second thermal insulation member 5. Optionally, the circuit board 3 is bonded to the second thermal insulation member 5. In some embodiments, the thermal conductivity of the second thermal insulation member 5 is smaller than the thermal conductivity of air, which can reduce the heat of the battery cell assembly 2 transferred to the bottom wall 121 through the second thermal insulation member 5, and reduce the condensation caused by the large temperature difference between the inner surface and the outer surface of the bottom wall 121.

[0039] In some embodiments, the second thermal insulation member 5 includes foam, and the second thermal insulation member 5 is in a compressed state, which can provide a buffering effect for the circuit board 3 .

[0040] It should be understood that in other embodiments, the material of the second thermal insulation component 5 may also be configured to include but not limited to materials such as silicone or rubber.

[0041] In the embodiment of the utility model, the abutment method of the first thermal insulation member 4 and the second thermal insulation member 5 is not limited. In other embodiments, the abutment includes but is not limited to being achieved by one or more connection methods such as adhesive connection, clamping connection, magnetic connection or threaded connection.

[0042] See also Figure 2 and Figure 3 The battery pack includes a third thermal insulation member 6. Along the first direction X, the third thermal insulation member 6 is arranged on the surface of the upper cover 11 close to the battery cell assembly 2. The third thermal insulation member 6 is connected to the extension portion 112 and the first thermal insulation member 4. The third thermal insulation member 6 abuts against the first thermal insulation member 4 to provide a limiting effect.

[0043] In some embodiments, the thermal conductivity of the third thermal insulation member 6 is smaller than that of air, which reduces the heat of the circuit board 3 transferred to the upper cover 11 through the third thermal insulation member 6 and reduces the condensation caused by the large temperature difference between the inner and outer surfaces of the upper cover 11.

[0044] In some embodiments, the third heat insulating member 6 is disposed on the surface of the extension portion 112 facing the circuit board 3. Optionally, the third heat insulating member 6 is fixed to the extension portion 112. The fixing method includes but is not limited to one or more of the following connection methods: clamping connection, adhesive connection, clamping connection, magnetic connection, or threaded connection.

[0045] See also Figure 2 and Figure 3 The battery pack includes a fourth heat insulating member 7, and the fourth heat insulating member 7 connects the protrusion 111 and the battery cell assembly 2. The fourth heat insulating member 7 is superimposed on the surface of the battery cell assembly 2 facing the protrusion 111.

[0046] In some embodiments, the thermal conductivity of the fourth thermal insulation member 7 is smaller than that of air, which reduces the heat of the battery cell assembly 2 transferred to the upper cover 11 through the fourth thermal insulation member 7 and reduces the condensation caused by the large temperature difference between the inner and outer surfaces of the upper cover 11.

[0047] In some embodiments, the area of ​​the fourth thermal insulation member 7 is equal to the surface area of ​​the battery cell assembly 2 facing the protrusion 111 .

[0048] See also Figure 2 and Figure 3 The battery pack further includes a fifth heat insulating member 8, which is connected to the bottom wall 121 and the battery cell assembly 2. The fifth heat insulating member 8 is superimposed on the surface of the battery cell assembly 2 facing the bottom wall 121, and the area of ​​the fifth heat insulating member 8 is equal to the surface area of ​​the battery cell assembly 2 facing the bottom wall 121.

[0049] In some embodiments, the third thermal insulation member 6, the fourth thermal insulation member 7 and the fifth thermal insulation member 8 all include foam, and the third thermal insulation member 6, the fourth thermal insulation member 7 and the fifth thermal insulation member 8 are all in a compressed state, which can provide thermal insulation. It should be understood that in other embodiments, the material of the third thermal insulation member 6, the fourth thermal insulation member 7 and the fifth thermal insulation member 8 can also be configured to include but not limited to materials such as silicone or rubber.

[0050] See also Figure 2 and Figure 3 The battery cell assembly 2 includes a plurality of battery cells 21 arranged along a first direction X, each battery cell 21 includes an electrode assembly, a battery cell housing 212, and an electrode terminal 213 connected to the electrode assembly and extending from the battery cell housing 212, and the electrode terminal 213 is connected to the circuit board 3. Optionally, the battery cell 21 is a soft-pack battery cell.

[0051] In some embodiments, the cell housing 212 includes a main body 212 a and a sealing portion 212 b , the electrode assembly is disposed in the main body 212 a , and the electrode terminal 213 extends from the sealing portion 212 b to the main body 212 a .

[0052] In some embodiments, the circuit board 3 includes a through opening 30, and at least one electrode terminal 213 is disposed on a side of the circuit board 3 away from the main body 212a after passing through the through opening 30, and a portion of the electrode terminal 213 is exposed between the main body 2012a and the circuit board 3, and the first thermal insulation member 4 can provide a buffering effect for the electrode terminal 213, reducing the probability of deformation of the electrode terminal 213. In some embodiments, the first thermal insulation member 4 and the second thermal insulation member 5 provide a buffering effect for the circuit board 3, reducing the force on the electrode terminal 213.

[0053] It should be understood that each battery cell 21 can be connected in series or in parallel as a whole, and in order to facilitate the connection of each battery cell 21, the electrode terminals 213 of the same polarity of each battery cell 21 can be arranged on the same side of the battery cell housing 212 along the second direction Y, and the second direction Y is perpendicular to the first direction X.

[0054] See also Figure 3 The circuit board 3 includes a first portion 31 and a second portion 32 that are separated from each other, and the electrode terminals 213 are disposed on the same side of the battery cell housing 212. A portion of the electrode terminals is connected to the first portion 31, and another portion of the electrode terminals is connected to the second portion 32. In other embodiments, the circuit board 3 is an integrated structure.

[0055] The utility model further provides an embodiment of an energy storage system, the energy storage system includes the above-mentioned battery pack, and the specific structure and function of the above-mentioned battery pack can be referred to the above-mentioned embodiment, which will not be described one by one here.

[0056] The battery pack of the embodiment of the utility model includes a shell 1, a battery cell assembly 2, a circuit board 3 and a first heat insulating member 4; the shell 1 includes an upper cover 11 and a lower shell 12, the lower shell 12 and the upper cover 11 are arranged along a first direction X, the lower shell 12 is provided with a receiving space and an opening that are interconnected, and the upper cover 11 is connected to the lower shell 12 and covers the opening; the battery cell assembly 2 is arranged in the receiving space; the circuit board 3 is arranged in the receiving space, the battery cell assembly 2 is connected to the circuit board 3, the first heat insulating member 4 is along the first direction, at least part of the first heat insulating member 4 is located between the circuit board 3 and the upper cover 44, the first heat insulating member 4 abuts against the circuit board 3, and the first heat insulating member 4 abuts against the upper cover 11. Through the above-mentioned first heat insulating member 4, it is possible to reduce the heat transfer from the battery cell assembly 2 and the circuit board 3 to the upper cover 11, thereby reducing the phenomenon of excessive temperature difference between the inside and outside of the upper cover 11, thereby reducing the probability of condensation on the upper cover 11, so as to reduce the impact on the battery pack.

[0057] The above description is only an 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: include: A housing, comprising an upper cover and a lower housing, wherein the lower housing and the upper cover are arranged along a first direction, the lower housing is provided with a receiving space and an opening that are interconnected, and the upper cover is connected to the lower housing and covers the opening; A battery cell assembly is arranged in the receiving space; A circuit board is arranged in the receiving space, and the battery cell assembly is connected to the circuit board. A first thermal insulation member, along the first direction, at least a portion of the first thermal insulation member is located between the circuit board and the upper cover, the first thermal insulation member abuts against the circuit board, and the first thermal insulation member abuts against the upper cover.

2. The battery pack according to claim 1, characterized in that: The first heat insulating member is provided with a first groove, and a portion of the circuit board is arranged in the first groove.

3. The battery pack according to claim 1, characterized in that: The battery pack further comprises a third heat insulating member, and along the first direction, the third heat insulating member is arranged on a surface of the upper cover close to the battery cell assembly; The third thermal insulation member is connected to the upper cover and the first thermal insulation member, the third thermal insulation member is in contact with the first thermal insulation member, and the thermal conductivity of the third thermal insulation member is smaller than the thermal conductivity of air.

4. The battery pack according to claim 3, characterized in that: The upper cover comprises a convex portion and an extending portion connected to each other, the convex portion protrudes from the extending portion in a direction opposite to the first direction, and the first heat insulating member abuts against the extending portion; The convex portion is provided with a receiving space, the battery pack includes an electronic module, and the electronic module is arranged in the receiving space; The battery pack includes a fourth thermal insulation member connected to the protrusion and the battery cell assembly, and the thermal conductivity of the fourth thermal insulation member is smaller than the thermal conductivity of air.

5. The battery pack according to claim 4, characterized in that: Along the first direction, the third heat insulating member is disposed on a surface of the extending portion facing the circuit board.

6. The battery pack according to claim 1, characterized in that: The lower shell comprises a bottom wall, and along the first direction, the bottom wall and the upper cover are located on both sides of the battery core assembly; The battery pack includes a second thermal insulation member. Along the first direction, at least a portion of the second thermal insulation member is located between the circuit board and the bottom wall. The second thermal insulation member abuts against the circuit board. The second thermal insulation member abuts against the bottom wall.

7. The battery pack according to any one of claims 1 to 6, characterized in that: The battery cell assembly includes a plurality of battery cells arranged along the first direction, each of the battery cells includes an electrode assembly, a battery cell shell, and an electrode terminal connected to the electrode assembly and led out from the battery cell shell, wherein the electrode terminal is connected to the circuit board; The battery cell housing comprises a main body and a sealing portion, the electrode assembly is arranged in the main body, and the electrode terminal extends from the sealing portion to the main body; The circuit board comprises a through opening, and at least one of the electrode terminals passes through the through opening and is arranged on a side of the circuit board away from the main body, and a portion of the electrode terminal is exposed between the main body and the circuit board.

8. The battery pack according to claim 7, characterized in that: The thermal conductivity of the first thermal insulation member is smaller than the thermal conductivity of air.

9. The battery pack according to claim 7, characterized in that: The first thermal insulation component includes foam, and the first thermal insulation component is in a compressed state.

10. An energy storage system, characterized in that: A battery pack comprising the battery pack as claimed in any one of claims 1 to 9.

Images