Battery pack and energy storage system

Abstract

Embodiments of the present invention relate to the technical field of energy storage. Disclosed are a battery pack and an energy storage device. The battery pack comprises a housing and a battery cell module; the housing comprises an accommodating cavity; the battery cell module is located in the accommodating cavity; the battery cell module comprises a first end wall, a second end wall, and a battery cell assembly; in a first direction, the battery cell assembly is located between the first end wall and the second end wall; the first end wall, the second end wall, and the battery cell assembly are fixed; the first end wall and the second end wall are fixed to the housing; and the battery cell module is configured to be detachably fixed to the housing. By means of the mode, the embodiments of the present invention can facilitate disassembly of the battery cell module, thereby facilitating maintenance or replacement of the battery cell module.

Description

A battery pack and energy storage system Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to a battery pack and energy storage system. Background Technology

[0002] During the assembly and production of battery packs, to facilitate assembly efficiency, the cell modules are usually bonded and fixed inside the casing using adhesives. However, as the battery pack is used for a longer period of time, it is inevitable that the battery pack will malfunction and require repair or replacement of internal components such as cell modules, circuit boards, or wiring harnesses. Using adhesives to fix the cell modules inside the casing makes it difficult to disassemble the cell modules, causing inconvenience for the repair or replacement of parts of the battery pack. Summary of the Invention

[0003] The main technical problem solved by the embodiments of the present invention is to provide a battery pack and energy storage system that allows for easy disassembly of the battery cell modules for maintenance or replacement.

[0004] To solve the above-mentioned technical problems, one technical solution adopted in this embodiment of the invention is: providing a battery pack, the battery pack including a housing and a cell module, the housing including a receiving cavity; the cell module is located in the receiving cavity, the cell module including a first end wall, a second end wall and a cell assembly, the cell assembly being located between the first end wall and the second end wall along a first direction, the first end wall, the second end wall and the cell assembly being fixed; the first end wall and the second end wall are fixed to the housing, and the cell module is configured to be detachably fixed to the housing. The cell module can be removed, thereby facilitating the repair or replacement of the cell module.

[0005] In one or more of the above optional embodiments, the battery pack includes a first fastener and a second fastener. A first hole is provided on the first end wall, and a second hole is provided on the second end wall. The housing includes a bottom wall, and the bottom wall and the battery cell module are arranged along a second direction. The bottom wall has a first protrusion and a second protrusion. The first fastener passes through the first hole and fixes the first end wall and the first protrusion. The second fastener passes through the second hole and fixes the second end wall and the second protrusion. The second direction is perpendicular to the first direction. The battery cell module is fixed to the bottom wall of the housing using the first and second fasteners, resulting in a simple structure and convenient operation.

[0006] 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 a battery cell housing and an electrode assembly. The battery cell housing includes a main body portion, and the electrode assembly is located within the main body portion. The battery pack includes two first fasteners, and a first end wall is provided with two first holes. Along the first direction, the projection of the main body portion is located between the projections of the two first fasteners. Positioning the main body portion between the projections of the two first fasteners facilitates the joint fixation of the battery cell module by the first fasteners and the first end wall, reducing the risk of the battery cell module shaking.

[0007] In one or more of the above optional embodiments, the battery cell assembly includes a plurality of battery cells, each battery cell including a battery cell housing, and each battery cell housing and bottom wall are configured to be separately disposed. This configuration eliminates the need for adhesives to bond the battery cell housing to the bottom wall, facilitating the disassembly of the battery cell module. Furthermore, it reduces the risk of direct contact between the battery cell housing and the housing, thereby reducing heat transfer from the battery cell to the housing.

[0008] In one or more of the above optional embodiments, at least a portion of each cell housing is located between the first protrusion and the second protrusion, which facilitates the first protrusion and the second protrusion in supporting the cell module and reduces the risk of cell module shaking.

[0009] In one or more of the above optional embodiments, the battery cell module includes a bracket fixed to the battery cell assembly. The bracket is fixed to at least one of a first end wall and a second end wall, and the bracket and the bottom wall are respectively located on opposite sides of the battery cell assembly. This facilitates the fixation of the battery cell module.

[0010] In one or more of the above optional embodiments, each battery cell includes a battery cell housing and an electrode assembly. The battery cell housing includes a main body portion, and the electrode assembly is located within the main body portion. The support includes a base portion, which is bonded to the battery cell housing. By bonding and fixing the base portion to the battery cell assembly, assembly is simple and convenient, thereby protecting the battery cell housing and restricting relative movement between the battery cells. The battery cell housings can transmit forces to each other and to the first end wall and the second end wall, which in turn transmit the forces to the housing, enhancing the protection of the battery cell module.

[0011] In one or more of the above optional embodiments, the base is bonded to the main body to achieve fixation between the base and the main body.

[0012] In one or more of the above optional embodiments, the battery pack includes a first insulating member located between the main body and the bracket. The main body and the first insulating member are bonded together, and the first insulating member and the bracket are bonded together. By providing a first insulating member between the bracket and the cell assembly, the insulation performance between the cell housing and the bracket can be improved, reducing the risk of the bracket short-circuiting the cell assembly.

[0013] 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 a battery cell housing, an electrode assembly, and an electrode terminal; the battery cell housing includes a main body portion, a first sealing portion, and a second sealing portion; the first sealing portion is connected to the main body portion; the electrode assembly is located inside the main body portion and is connected to the electrode terminal; the electrode terminal extends out from the first sealing portion; and the second sealing portion is connected to the main body portion; a bracket is bonded to the main body portion and the second sealing portion to restrict the mutual movement between the battery cells.

[0014] In one or more of the above optional embodiments, the bracket includes an extension and a bent portion connecting the base and the extension. The base and the cell assembly are fixed, and at least one of the first end wall and the second end wall is fixed to the extension. The extension extends beyond the base in a second direction. By fixing the base to the cell assembly and fixing at least one of the first and second end walls, the stability of the fixation between the cell assembly and the first or second end wall can be improved, and the risk of movement of the cell assembly relative to the first or second end wall in a third direction can be reduced.

[0015] In one or more of the above optional embodiments, the extension includes a first extension and a second extension, the first extension and the first end wall are fixed, and the second extension and the second end wall are fixed, thereby improving the stability of the fixation between the cell assembly and the first end wall and between the cell assembly and the second end wall.

[0016] In one or more of the above optional embodiments, the battery cell module includes a first circuit board fixed to the base, the first circuit board being electrically connected to the battery cell assembly, and the first circuit board and the battery cell assembly being located on opposite sides of the base.

[0017] In one or more of the above optional embodiments, the battery pack includes a connection portion configured to connect to an external device; the battery pack also includes a wiring harness connecting the first circuit board and the connection portion, the wiring harness being fixed to the side of the base away from the cell assembly. By fixing the wiring harness to the side of the base away from the cell assembly, it is convenient to connect the wiring harness to the first circuit board; furthermore, fixing the wiring harness reduces movement of the wiring harness, lowering the risk of detachment between the wiring harness and the first circuit board, and between the wiring harness and the connection portion.

[0018] In one or more of the above optional embodiments, the battery cell module includes a fixing member that surrounds the outside of the first end wall and the second end wall, and the fixing member fixes the battery cell assembly, the first end wall and the second end wall.

[0019] In one or more of the above optional embodiments, the fixing member includes a first fixing member and a second fixing member, and along the second direction, the projection of the base is between the projection of the first fixing member and the projection of the second fixing member. By providing the first fixing member and the second fixing member, the stability of the fixing between the first end wall, the cell assembly and the second end wall can be improved.

[0020] In one or more of the above optional embodiments, the battery cell module includes a second circuit board, and the battery cell includes electrode terminals connected to the second circuit board. The second circuit board is fixed to the first end wall and / or the second end wall. The second circuit board can collect information from the battery cell, including temperature, current, voltage, etc., to facilitate monitoring of the battery cell and improve the safety performance of the battery pack.

[0021] In one or more of the above optional embodiments, the electrode terminals include positive electrode terminals and negative electrode terminals, which are located on both sides of the cell housing along a third direction. The second circuit board includes a first sub-circuit board and a second sub-circuit board, which are located on both sides of the cell housing along a third direction. In each cell's positive and negative electrode terminals, one is connected to the first sub-circuit board and the other is connected to the second sub-circuit board. The first sub-circuit board is fixed to the first end wall and / or the second end wall, and the second sub-circuit board is fixed to the first end wall and / or the second end wall, thereby improving the stability of the fixation between the first end wall and / or the second end wall and the cell assembly.

[0022] In one or more of the above optional embodiments, the housing includes a top cover, a bottom wall, a first side wall, a second side wall, a third side wall, and a fourth side wall. The top cover, bottom wall, first side wall, second side wall, third side wall, and fourth side wall together enclose a receiving cavity. The top cover and bottom wall are disposed opposite each other along a second direction, and the first side wall and third side wall are disposed opposite each other along a first direction.

[0023] In one or more of the above optional embodiments, the first end wall and the second end wall are fixed to the bottom wall. The first end wall is configured to be separate from the top cover, the first side wall, the second side wall, the third side wall, and the fourth side wall; the second end wall is configured to be separate from the top cover, the bottom wall, the first side wall, the second side wall, the third side wall, and the fourth side wall. Configuring the first and second end walls to be separate from the top cover, the first side wall, the second side wall, the third side wall, and the fourth side wall facilitates the disassembly of the battery cell module, making it convenient for repair or replacement.

[0024] To solve the above-mentioned technical problems, another technical solution adopted in the embodiments of the present invention is to provide an energy storage device, including the above-mentioned battery pack.

[0025] The beneficial effects of the embodiments of the present invention are as follows: Unlike the prior art, the embodiments of the present invention can detach the battery cell module by detachably fixing the first end wall and the second end wall to the housing, which facilitates the repair or replacement of the battery cell module. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in specific embodiments of the present invention or the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0027] Figure 1 is a schematic diagram of the battery pack provided in an embodiment of the present invention;

[0028] Figure 2 is an exploded structural diagram of the battery pack provided in an embodiment of the present invention;

[0029] Figure 3 is a partial structural schematic diagram of the battery pack provided in an embodiment of the present invention;

[0030] Figure 4 is a schematic diagram of the structure of the battery cell module provided in an embodiment of the present invention;

[0031] Figure 5 is a cross-sectional schematic diagram of a partial structure of the battery pack provided in an embodiment of the present invention;

[0032] Figure 6 is a schematic diagram of the structure of the bottom wall, the first fastener and the second fastener provided in the embodiment of the present invention;

[0033] Figure 7 is an exploded structural diagram of a portion of the battery cell module provided in an embodiment of the present invention.

[0034] Figure 8 is a schematic diagram of the battery cell provided in an embodiment of the present invention;

[0035] Figure 9 is an exploded structural diagram of the battery cell module provided in an embodiment of the present invention;

[0036] Figure 10 is a schematic diagram of the energy storage device provided in an embodiment of the present invention.

[0037] Attached icon number Detailed Implementation

[0038] To facilitate understanding of the present invention, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "upper," "lower," "inner," "outer," "vertical," "horizontal," etc., used in this specification indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0040] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0041] In existing battery packs, battery cell modules are typically glued and fixed to the casing using adhesives, with circuit boards and wiring harnesses usually housed within the cell modules. However, as battery packs age, these components require repair or replacement. Using adhesives to fix the cell modules to the casing makes disassembly difficult, hindering the repair or replacement of the wiring harnesses, cell modules, and circuit boards by technicians.

[0042] To address the aforementioned issues, this application provides a battery pack and energy storage system that allows the cell module to be disassembled from the housing, facilitating the disassembly or replacement of components such as the cell module, circuit board, and wiring harness.

[0043] The following provides a detailed description of the specific structure and function of the battery pack and energy storage system provided in this application.

[0044] Please refer to Figures 1, 2 and 3. The battery pack 100 includes a housing 1 and a cell module 2. The housing 1 includes a receiving cavity 11, and the cell module 2 is housed in the receiving cavity 11.

[0045] In some embodiments, referring to FIG4, the battery module 2 includes a first end wall 21, a second end wall 22, and a battery assembly 23. The first end wall 21, the second end wall 22, and the battery assembly 23 are stacked along a first direction X, and the battery assembly 23 is located between the first end wall 21 and the second end wall 22. The first end wall 21, the second end wall 22, and the battery assembly 23 are fixed. The first end wall 21 is fixed to the housing 1, and the second end wall 22 is fixed to the housing 1.

[0046] In some embodiments, the battery cell module 2 is configured to be detachably connected to the housing 1. A first end wall 21 is detachably fixed to the housing 1, and a second end wall 22 is detachably fixed to the housing 1. The battery cell module 2 can be removed for easy inspection, repair, or replacement.

[0047] In some embodiments, referring to Figures 5-7, the battery pack 100 includes a first fastener 3, and the first end wall 21 includes a first hole 211. The housing 1 includes a bottom wall 12, and the bottom wall 12 and the cell module 2 are arranged along a second direction Y, wherein the second direction Y is perpendicular to the first direction X.

[0048] The bottom wall 12 includes a first protrusion 121, a first end wall 21 abutting against the first protrusion 121, and a first fastener 3 passing through a first hole 211. The first fastener 3 fixes the first end wall 21 and the first protrusion 121, thus securing the bottom wall 12 and the first end wall 21. The first fastener 3 can be removed from the first protrusion 121, facilitating the detachable fixing of the second fastener 4 between the battery module 2 and the housing 1. The first fastener 3 includes, but is not limited to, studs, screws, bolts, etc.

[0049] In some embodiments, please refer to Figures 5 and 6. The first fastener 3 is a stud, and the first protrusion 121 includes a first threaded groove 1211. The first threaded groove 1211 is provided with an internal thread. After the first fastener 3 passes through the first hole 211, it is screwed and fixed to the first threaded groove 1211, thereby realizing the detachable fixation between the first end wall 21 and the first protrusion 121.

[0050] In some embodiments, the first protrusion 121 and the bottom wall 12 are integrally formed. In other embodiments, the first protrusion 121 is fixed to the bottom wall 12, and the fixing method includes, but is not limited to, welding, screw fixing, bonding, snap-fitting, etc.

[0051] In some embodiments, the bottom wall 12 does not have a first protrusion 121, and the first end wall 21 is fixed to the bottom wall 12. In some embodiments, referring to Figures 5-7, the battery pack 100 includes a second fastener 4, and the second end wall 22 includes a second hole 221. The bottom wall 12 includes a second protrusion 122, the second end wall 22 abuts against the second protrusion 122, and the second fastener 4 passes through the second hole 221, fixing the second end wall 22 and the second protrusion 122. The second fastener 4 can be removed from the second protrusion 122, which facilitates the detachable fixing between the cell module 2 and the housing 1. Optionally, the second fastener 4 includes a screw, including but not limited to studs, screws, bolts, etc.

[0052] In some embodiments, referring to Figures 5 and 6, the second fastener 4 is a stud, and the second protrusion 122 includes a second threaded groove 1221 with an internal thread. The second fastener 4 passes through the second hole 221 and is screwed to the second threaded groove 1221, thereby achieving a detachable fixation between the second end wall 22 and the second protrusion 122.

[0053] In some embodiments, the second protrusion 122 and the bottom wall 12 are integrally formed. In other embodiments, the second protrusion 122 is fixed to the bottom wall 12, and the fixing method includes, but is not limited to, welding, screw fixing, bonding, snap-fitting, etc.

[0054] In some embodiments, the bottom wall 12 is not provided with the second protrusion 122, and the second end wall 21 is fixed to the bottom wall 12.

[0055] In some embodiments, please refer to Figures 5, 6 and 7, the bottom wall 12 is provided with a third protrusion 123, which is distributed at intervals with the first protrusion 121 along the third direction Z, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0056] The battery pack 100 includes two first fasteners 3, and the first end wall 21 includes two first holes 211. One first fastener 3 corresponds to a first protrusion 121, and the first fastener 3 passes through a first hole 211 and is screwed into a first threaded groove 1211 on the first protrusion 121. The other first fastener 3 corresponds to a third protrusion 123, and the first fastener 3 passes through another first hole 211 and is screwed into a third threaded groove 1231 on the third protrusion 123. In this embodiment, by providing multiple first fasteners 3, the stability of the fixation between the cell module 2 and the housing 1 can be improved.

[0057] In some embodiments, referring to Figures 5, 6, and 7, the bottom wall 12 is provided with a fourth protrusion 134, and the fourth protrusion 124 and the second protrusion 122 are distributed at intervals along the third direction Z. The battery pack 100 includes at least two second fasteners 4, and the second end wall 22 includes at least two second holes 221. One second fastener 4 corresponds to the second protrusion 122, and the second fastener 4 passes through a second hole 221 and is screwed into a second threaded groove 1221 on the second protrusion 122. The other second fastener 4 corresponds to the fourth protrusion 124, and the second fastener 4 passes through another second hole 221 and is screwed into a fourth threaded groove 1241 on the fourth protrusion 124. In this embodiment, by providing multiple second fasteners 4, the stability of the fixation between the cell module 2 and the housing 1 can be improved.

[0058] In some embodiments, referring to Figures 5 and 7, the battery cell assembly 23 includes a plurality of battery cells 231 stacked along a first direction X. Each battery cell 231 includes a battery cell housing 2311 and an electrode assembly (not shown). The battery cell housing 2311 includes a main body portion 23111, and the electrode assembly is housed within the main body portion 23111. The electrode assembly includes a positive electrode plate, a negative electrode plate, and a separator, with the separator located between the positive and negative electrode plates.

[0059] In some embodiments, the multiple cells 231 may be connected in series, in parallel or in a mixed manner, and this application does not limit this.

[0060] In some embodiments, referring to Figures 7 and 8, each cell 231 includes an electrode terminal 2314. The cell housing 2311 includes a first sealing portion 23112 and a second sealing portion 23113. The first sealing portion 23112 is connected to one end of the main body portion 23111, one end of the electrode terminal 2314 is connected to an electrode assembly, and the other end of the electrode terminal 2314 extends from the first sealing portion 23112. The second sealing portion 23113 is connected to the main body portion 23111, and the second sealing portion 23113 and the first sealing portion 23112 are located on different sides of the main body portion 23111. The first sealing portion 23112 and the second sealing portion 23113 together seal the main body portion 23111, thereby reducing the risk of electrolyte leakage within the main body portion 23111.

[0061] In some embodiments, please refer to FIG8, the battery cell housing 2311 includes two second sealing portions 23113, which are located on both sides of the main body portion 23111 along the second direction Y.

[0062] In some embodiments, the battery cell 231 includes a pouch cell, and the battery cell housing 2311 includes an aluminum-plastic film.

[0063] In some embodiments, the electrode terminal 2314 includes a positive electrode terminal 2314a and a negative electrode terminal 2314b. Referring to FIG7, along the third direction Z, the positive electrode terminal 2314a and the negative electrode terminal 2314b are located on both sides of the cell housing 2311, respectively.

[0064] The cell housing 2311 includes two first sealing portions 23112, which are respectively disposed on both sides of the main body 2311 along a third direction Z. A positive electrode terminal 2314a extends from one of the first sealing portions 23112, and a negative electrode terminal 2314b extends from the other first sealing portion 23112, facilitating electrical connection between the positive and negative electrode terminals 2314a and 2314b and other components (such as the first circuit board 6 or the second circuit board 9 hereinafter). In other embodiments, the cell housing 2311 includes one first sealing portion 23112, from which the positive electrode terminal 2314a and the negative electrode terminal 2314a extend.

[0065] In some embodiments, referring to Figures 6 and 7, the battery pack 100 includes two first fasteners 3. Along the first direction X, the projection of each main body portion 23111 is located between the projections of the two first fasteners 3, which is beneficial for the first fasteners 3 and the first end wall 21 to jointly fix the cell module 2 and reduce the risk of the cell module 2 shaking.

[0066] In some embodiments, referring to Figures 6 and 7, the battery pack 100 includes two second fasteners 4, with the projection of each main body portion 23111 located between the projections of the two second fasteners 4 along the first direction X. This facilitates the second fasteners 4 and the second end wall 22 in jointly securing the cell module 2, reducing the risk of the cell module 2 shaking.

[0067] In some embodiments, please refer to FIG5, each cell housing 2311 is configured to be separated from the bottom wall 12. This configuration reduces the adhesive from bonding the cell housing 2311 to the bottom wall 12, facilitating the disassembly of the cell module 2. On the other hand, it reduces the risk of direct contact between the cell housing 2311 and the housing 1, thereby reducing the heat transferred from the cell 231 to the housing 1.

[0068] In some embodiments, the separation configuration includes contact connection between the cell housing 2311 and the bottom wall 12. During disassembly, each cell 231 can be directly separated from the bottom wall 12.

[0069] In some embodiments, the separation configuration includes a gap formed between the cell housing 2311 and the bottom wall 12, and the cell housing 2311 and the bottom wall 12 are not connected.

[0070] In some embodiments, the separation includes a second insulating member 120 between the cell housing 2311 and the bottom wall 12, and the cell housing 2311 and the second insulating member 120 are not bonded together. For example, the cell housing 2311 and the second insulating member 120 may be in contact or connected, or a gap may be formed between the cell housing 2311 and the second insulating member 120.

[0071] In some embodiments, referring to Figures 6 and 7, at least a portion of each cell housing 2311 is located between the first protrusion 121 and the second protrusion 122 along the first direction X, so that the first protrusion 121 and the second protrusion 122 can support the cell module 2 and reduce the risk of the cell module 2 shaking.

[0072] In some embodiments, referring to FIG4, the cell module 2 includes a fixing member 24 surrounding the outside of the first end wall 21 and the second end wall 22, and the fixing member 24 binds and fixes the first end wall 21, the cell assembly 23, and the second end wall 22. The first end wall 21 and the second end wall 22 provide pressure to the cell 231 to limit the expansion of the cell 231. Optionally, the fixing member 24 includes a steel strip.

[0073] In some embodiments, referring to FIG4, the fixing member 24 includes a first fixing member 241 and a second fixing member 242. Along a third direction Z, the first fixing member 241 and the second fixing member 242 are spaced apart. The first fixing member 241 surrounds the outer sides of the first end wall 21 and the second end wall 22, and the second fixing member 242 surrounds the outer sides of the first end wall 21 and the second end wall 22 to fix the first end wall 21, the cell assembly 23, and the second end wall 22 together. In this embodiment, by providing the first fixing member 241 and the second fixing member 242, the stability of the fixation between the first end wall 21, the cell assembly 23, and the second end wall 22 can be improved.

[0074] In some embodiments, referring to Figures 4 and 5, the cell module 20 includes a bracket 5, which is fixed to the cell assembly 23. The bracket 5 is fixed to at least one of the first end wall 21 and the second end wall 22. Along the second direction Y, the bracket 5 and the bottom wall 12 are located on opposite sides of the cell assembly 23. This facilitates the fixation of the cell module 2.

[0075] In some embodiments, referring to FIG9, the bracket 5 includes a base 51, which is bonded and fixed to the cell housing 2311. In this embodiment, by bonding and fixing the base 51 to the cell assembly 23, assembly is simple and convenient, thereby protecting the cell housing 2311 and restricting the relative movement between the cells 231. The cell housings 2311 can transmit forces to each other and to the first end wall 21 and the second end wall 22, which in turn transmit the forces to the housing 1, thereby enhancing the protection of the cell module 2. Optionally, the base 51 is bonded and fixed to a portion of the cell housing 2311. Optionally, the base 51 is bonded and fixed to each cell housing 2311, further improving the protection of the cell module 2.

[0076] In some embodiments, the base 51 is bonded to the cell housing 2311 by an adhesive 101, which has a thermal conductivity of 0.1-0.5 (W / m·K) at 25 degrees Celsius. The cell housing 2311 is bonded to the support 5 by the adhesive 101, which also transfers heat and reduces the temperature difference between the individual cells 231. Optionally, the adhesive 101 may include a two-component structural adhesive, such as polyurethane adhesive.

[0077] In some embodiments, the base 51 is bonded to the main body 23111, which helps to strengthen the fixing effect between each cell 231.

[0078] In some embodiments, the bracket 5 is bonded to the main body portion 23111 and the second sealing portion 23113 to restrict the relative movement between the individual cells 231. Optionally, the bracket 5 is bonded to the main body portion 23111 and the second sealing portion 23113 of each cell 231. Optionally, the bracket 5 is bonded to the main body portion 23111 and the second sealing portion 23113 of a portion of the cells 231.

[0079] In some embodiments, referring to FIG9, the battery pack 100 includes a first insulating member 50, a cell housing 2311 and the first insulating member 50 are bonded and fixed, and a base 51 is bonded and fixed to the first insulating member 50. By providing the first insulating member 50 between the bracket 5 and the cell assembly 23, the insulation performance between the cell housing 2311 and the bracket 5 can be improved, reducing the risk of the bracket 5 short-circuiting the cell assembly 23.

[0080] In some embodiments, the first insulating member 50 is an insulating film that is bonded to the surface of the base 51 facing the cell assembly 23.

[0081] In some embodiments, the first insulating element 50 is made of at least one material selected from polycarbonate and epoxy resin.

[0082] In some embodiments, referring to Figures 4 and 9, the bracket 5 includes an extension 52 and a bend 53. One end of the bend 53 is connected to the base 51, and the other end of the bend 53 is connected to the extension 52. The base 51 is fixed to the cell assembly 23, and at least one of the first end wall 21 and the second end wall 22 is fixed to the extension 52. Along the second direction Y, the extension 52 extends beyond the base 51 so that the extension 52 can provide the space required to be fixed to the first end wall 21 or the second end wall 22.

[0083] In this embodiment, by fixing the base 51 to the cell assembly 23 and fixing at least one of the first end wall 21 and the second end wall 22, the stability of the fixation between the cell assembly 23 and the first end wall 21 or the second end wall 22 can be improved, and the risk of the cell assembly 23 moving relative to the first end wall 21 or the second end wall 22 in the third direction Z can be reduced.

[0084] In some embodiments, referring to FIG9, the extension 52 includes a first extension 521 and a second extension 522, the first extension 521 and the second extension 522 being opposite to each other along a first direction X, the first extension 521 being fixed to the first end wall 21, and the second extension 522 being fixed to the second end wall 22, thereby improving the stability of the fixation between the cell assembly 23 and the first end wall 21 and between the cell assembly 23 and the second end wall 22.

[0085] In some embodiments, the bending portion 53 includes a first bending portion 531 and a second bending portion 532. One end of the first bending portion 531 is connected to the base portion 51, and the other end of the first bending portion 531 is connected to the first extension portion 521. The second bending portion 532 is opposite to the first bending portion 531 along a first direction X. One end of the second bending portion 532 is connected to the base portion 51, and the other end of the second bending portion 532 is connected to the second extension portion 522.

[0086] In some embodiments, the base 51, the first bend 531, the second bend 532, the first extension 521, and the second extension 522 are integrally formed.

[0087] In some embodiments, the bracket 5 is made of metal material, which has high strength and can improve the stability of the fixation between the battery cell assembly 23 and the first end wall 21 and the second end wall 22.

[0088] In some embodiments, referring to FIG4, along the second direction Y, the projection of the base 51 is between the projection of the first fixing member 241 and the projection of the second fixing member 242. While strengthening the fixation of the battery cell module 2, it can also reduce the impact of the first fixing member 241 and the second fixing member 242 on the adhesive fixation between the base 51 and the battery cell assembly 23.

[0089] In some embodiments, referring to FIG9, the battery module 2 includes a first circuit board 6 fixed to the base 51, the first circuit board 6 being electrically connected to the battery assembly 23. Along the second direction Y, the first circuit board 6 and the battery assembly 23 are located on opposite sides of the base 51.

[0090] In some embodiments, the first circuit board 6 is configured to control the input / output current and voltage of the battery cell assembly 23. Optionally, the first circuit board 6 includes a BMS component.

[0091] In some embodiments, referring to FIG9, the base 51 includes a plurality of protrusions 511 spaced apart on the surface of the base 51 facing away from the cell assembly 23. The first circuit board 6 abuts against the plurality of protrusions 511 and is fixed to the plurality of protrusions 511 by screws (not shown). In this embodiment, by providing a plurality of protrusions 511, a gap can be created between the first circuit board 6 and the base 51 to avoid the pins of electronic components on the first circuit board 6, reducing the risk of the base 51 short-circuiting the first circuit board 6.

[0092] In some embodiments, referring to FIG1, the battery pack 100 includes a connection portion 7 disposed on the housing 1, the connection portion 7 being electrically connected to the cell assembly 23, at least a portion of the connection portion 7 being exposed to the outside, and the portion of the connection portion 7 exposed to the outside being configured to be connected to an external device.

[0093] In some embodiments, referring to Figures 1 and 3, the battery pack 100 includes a wiring harness 8 that connects a first circuit board 6 and a connecting portion 7 to achieve an electrical connection between the first circuit board 6 and the cell assembly 23. The wiring harness 8 is fixed to the side of the base 51 facing away from the cell assembly 23. In this embodiment, by fixing the wiring harness 8 to the side of the base 51 facing away from the cell assembly 23, it is convenient to connect the wiring harness 8 to the first circuit board 6. Furthermore, fixing the wiring harness 8 reduces movement of the wiring harness 8, thereby reducing the risk of the wiring harness 8 becoming detached from the first circuit board 6 and from the connecting portion 7.

[0094] In some embodiments, referring to Figures 3 and 4, the bracket 5 includes a first edge portion 55 and a second edge portion 56, both of which are connected to the base 51. Along the third direction Z, the first edge portion 55 and the second edge portion 56 are distributed on both sides of the base 51. A portion of the wiring harness 8 is fixed to the first edge portion 55, and a portion of the wiring harness 8 is fixed to the second edge portion 56. Along the second direction Y, there are clearance spaces 57 between the first edge portion 55 and the battery cell assembly 23, and between the second edge portion 56 and the battery cell assembly 23. At least a portion of the first fixing member 241 is received within the clearance space 57 formed by the first edge portion 55 and the battery cell assembly 23, and at least a portion of the second fixing member 242 is received within the clearance space 57 formed by the second edge portion 56 and the battery cell assembly 23. This reduces the impact of the bracket 5 on the layout of the first fixing member 241 and the second fixing member 242.

[0095] In some embodiments, please refer to Figures 4 and 9. The cell module 2 includes a second circuit board 9. The electrode terminal 2314 is connected to the second circuit board 9. The second circuit board 9 is fixed to at least one of the first end wall 21 and the second end wall 22. The second circuit board 9 can collect information of the cell 231, including temperature, current, voltage and other information, so as to facilitate the monitoring of the cell 231 and improve the safety performance of the battery pack 100.

[0096] In some embodiments, referring to Figures 4 and 9, the second circuit board 9 includes a first sub-circuit board 91 and a second sub-circuit board 92. Along the third direction Z, the first sub-circuit board 91 and the second sub-circuit board 92 are respectively located on both sides of the cell housing 2311. In each cell 231, one of the positive electrode terminals 2314a and the other of the negative electrode terminals 2314b are connected to the first sub-circuit board 91, and the other is connected to the second sub-circuit board 92. Both the first sub-circuit board 91 and the second sub-circuit board 92 can collect information such as temperature, current, and voltage of each cell 231. The first sub-circuit board 91 is fixed to at least one of the first end wall 21 and the second end wall 22, and the second sub-circuit board 92 is fixed to at least one of the first end wall 21 and the second end wall 22.

[0097] In some embodiments, referring to FIG4, the first sub-circuit board 91 is fixed to at least one of the first end wall 21 and the second end wall 22, thereby improving the stability of the fixation between the first end wall 21 and / or the second end wall 22 and the cell assembly 23.

[0098] In some embodiments, the first sub-circuit board 91 is fixed to the first end wall 21 and the first sub-circuit board 91 is fixed to the second end wall 22, which can improve the stability of the fixation between the first end wall 21, the second end wall 22 and the cell assembly 23.

[0099] In some embodiments, referring to FIG4, the second sub-circuit board 92 is fixed to at least one of the first end wall 21 and the second end wall 22, which can further improve the stability of the fixation between the first end wall 21 and / or the second end wall 22 and the cell assembly 23.

[0100] In some embodiments, the second sub-circuit board 92 is fixed to the first end wall 21 and the second end wall 22, which can improve the stability of the fixation between the first end wall 21, the second end wall 22 and the cell assembly 23.

[0101] In some embodiments, referring to Figures 2 and 3, the housing 1 includes a top cover 13, a bottom wall 12, a first side wall 14, a second side wall 15, a third side wall 16, and a fourth side wall 17. The bottom wall 12, the first side wall 14, the second side wall 15, the third side wall 16, and the fourth side wall 17 together enclose the aforementioned receiving cavity 11. The top cover 13 detachably covers the receiving cavity 11, wherein the top cover 13 and the bottom wall 12 are opposite each other along the second direction Y, the first side wall 14 and the third side wall 16 are opposite each other along the first direction X, and the second side wall 15 and the fourth side wall 17 are opposite each other along the third direction Z.

[0102] In some embodiments, referring to Figures 2 and 5, the first end wall 21 is fixed to the bottom wall 12, and the second end wall 22 is fixed to the bottom wall 12. The first end wall 21 is configured to be separate from the top cover 13, the first side wall 14, the second side wall 15, the third side wall 16, and the fourth side wall 17. The second end wall 22 is also configured to be separate from the top cover 13, the first side wall 14, the second side wall 15, the third side wall 16, and the fourth side wall 17. Both the first end wall 21 and the second end wall 22 are only fixed to the bottom wall 12. When installing or removing the battery cell module 2, it is only necessary to fix the first end wall 21 and the second end wall 22 to the bottom wall 12, or to remove the first end wall 21 and the second end wall 22 from the bottom wall 12, which facilitates the installation or removal of the battery cell module 2.

[0103] Referring to Figures 2 and 4, the bracket 5 includes a shielding portion 58, which is connected to the first extension portion 5211. The shielding portion 58 is disposed opposite to the first end wall 21, which is closer to the first side wall 14 than the second end wall 22. Along the first direction X, the projection of the first circuit board 6 is located within the projection of the shielding portion 58. When the battery pack 100 is placed with the first side wall 14 facing the ground, the shielding portion 58 can prevent water droplets condensed on the third side wall 16 from dripping onto the first circuit board 6, thereby reducing the risk of short circuit of the first circuit board 6.

[0104] In some embodiments, please refer to FIG2, the battery pack 100 includes a plurality of cell modules 2, which are detachably fixed to the bottom wall 12 of the housing 1. The plurality of cell modules 2 can be connected in series, in parallel or in a mixed manner to increase the capacity of the battery pack 100.

[0105] The present invention further provides an embodiment of an energy storage device. The energy storage device 1000 includes the aforementioned battery pack 100. For the specific structure and function of the battery pack 100, please refer to the above embodiments, which will not be repeated here. It is understood that the energy storage device 1000 may include one or more battery packs 100. When there are multiple battery packs 100, the multiple battery packs 100 may be connected in series, in parallel, or in a mixed connection.

[0106] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A battery pack, characterized in that, include: The housing includes a receiving cavity; A battery cell module is located within the receiving cavity. The battery cell module includes a first end wall, a second end wall, and a battery cell assembly. Along a first direction, the battery cell assembly is located between the first end wall and the second end wall. The first end wall, the second end wall, and the battery cell assembly are fixed. The first end wall and the second end wall are fixed to the housing, and the battery cell module is configured to be detachably fixed to the housing.

2. The battery pack according to claim 1, characterized in that, The battery pack includes a first fastener and a second fastener, the first end wall is provided with a first hole, and the second end wall is provided with a second hole. The housing includes a bottom wall, the bottom wall and the battery cell module are arranged along a second direction, the bottom wall is provided with a first protrusion and a second protrusion, the first fastener passes through the first hole and fixes the first end wall and the first protrusion, the second fastener passes through the second hole and fixes the second end wall and the second protrusion; wherein, the second direction is perpendicular to the first direction.

3. The battery pack according to claim 2, characterized in that, The battery cell assembly includes a plurality of battery cells arranged along a first direction, each battery cell including a battery cell housing and an electrode assembly, the battery cell housing including a main body portion, and the electrode assembly located within the main body portion; The battery pack includes two first fasteners, and the first end wall is provided with two first holes. Along the first direction, the projection of the main body is located between the projections of the two first fasteners.

4. The battery pack according to claim 2 or 3, characterized in that, The battery cell assembly includes a plurality of battery cells, each battery cell including a battery cell housing, and each battery cell housing and the bottom wall are configured to be separately disposed.

5. The battery pack according to claim 4, characterized in that, At least a portion of each of the cell housings is located between the first protrusion and the second protrusion.

6. The battery pack according to any one of claims 2-5, characterized in that, The battery cell module includes a bracket fixed to the battery cell assembly. The bracket is fixed to at least one of the first end wall and the second end wall. The bracket and the bottom wall are respectively located on opposite sides of the battery cell assembly.

7. The battery pack according to claim 6, characterized in that, Each of the battery cells includes a battery cell housing and an electrode assembly, the battery cell housing including a main body portion, and the electrode assembly located within the main body portion; The bracket includes a base, which is bonded to the battery cell housing.

8. The battery pack according to claim 6, characterized in that, The base is bonded to the main body.

9. The battery pack according to any one of claims 7 or 8, characterized in that, The battery pack includes a first insulating member located between the main body and the bracket. The main body and the first insulating member are bonded together, and the first insulating member and the bracket are bonded together.

10. The battery pack according to any one of claims 7-9, characterized in that, The battery cell assembly includes a plurality of battery cells, which are arranged along a first direction; Each of the battery cells includes a battery cell housing, an electrode assembly, and an electrode terminal. The battery cell housing includes a main body, a first sealing part, and a second sealing part. The first sealing part is connected to the main body. The electrode assembly is located inside the main body and is connected to the electrode terminal. The electrode terminal extends out from the first sealing part. The second sealing part is connected to the main body. The bracket is bonded to the main body and the second sealing part.

11. The battery pack according to any one of claims 7-10, characterized in that, The bracket includes an extension and a bent portion connecting the base and the extension. The base and the cell assembly are fixed. At least one of the first end wall and the second end wall is fixed to the extension. The extension extends beyond the base along the second direction.

12. The battery pack according to claim 11, characterized in that, The extension includes a first extension and a second extension, wherein the first extension is fixed to the first end wall and the second extension is fixed to the second end wall.

13. The battery pack according to any one of claims 7-12, characterized in that, The battery cell module includes a first circuit board fixed to the base, the first circuit board being electrically connected to the battery cell assembly, and the first circuit board and the battery cell assembly being located on opposite sides of the base.

14. The battery pack according to claim 13, characterized in that, The battery pack includes a connection portion configured to connect to an external device; The battery pack includes a wiring harness that connects the first circuit board and the connecting portion, and the wiring harness is fixed to the base on the side opposite to the cell assembly.

15. The battery pack according to any one of claims 7-14, characterized in that, The battery cell module includes a fixing member that surrounds the outside of the first end wall and the second end wall, and the fixing member fixes the battery cell assembly, the first end wall and the second end wall.

16. The battery pack according to claim 15, characterized in that, The fastener includes a first fastener and a second fastener, and along the second direction, the projection of the base lies between the projection of the first fastener and the projection of the second fastener.

17. The battery pack according to any one of claims 1-16, characterized in that, The battery cell module includes a second circuit board. The battery cell includes electrode terminals, which are connected to the second circuit board, and the second circuit board is fixed to the first end wall and / or the second end wall.

18. The battery pack according to claim 17, characterized in that, The electrode terminals include positive electrode terminals and negative electrode terminals, and along a third direction, the positive electrode terminals and the negative electrode terminals are located on both sides of the cell housing; The second circuit board includes a first sub-circuit board and a second sub-circuit board. Along a third direction, the first sub-circuit board and the second sub-circuit board are located on both sides of the cell housing. In each positive electrode terminal and negative electrode terminal of the cell, one is connected to the first sub-circuit board and the other is connected to the second sub-circuit board. The first sub-circuit board is fixed to the first end wall and / or the second end wall, and the second sub-circuit board is fixed to the first end wall and / or the second end wall.

19. The battery pack according to claims 1-18, characterized in that, The housing includes a top cover, a bottom wall, a first side wall, a second side wall, a third side wall, and a fourth side wall. The top cover, the bottom wall, the first side wall, the second side wall, the third side wall, and the fourth side wall together enclose the receiving cavity. The top cover and the bottom wall are disposed opposite each other along a second direction, and the first side wall and the third side wall are disposed opposite each other along the first direction.

20. The battery pack according to claim 19, characterized in that, The first end wall and the second end wall are fixed to the bottom wall. The first end wall is configured to be separate from the top cover, the first side wall, the second side wall, the third side wall and the fourth side wall. The second end wall is configured to be separate from the top cover, the bottom wall, the first side wall, the second side wall, the third side wall and the fourth side wall.

21. An energy storage device, characterized in that, The battery pack includes any one of claims 1-20.

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