Battery cell assembly and battery module

Abstract

The utility model belongs to the technical field of power batteries, and discloses a battery cell assembly and a battery module. The battery cell assembly comprises a battery cell row, the battery cell row comprises a plurality of battery cells arranged in the first direction, in the battery cell row, a first heat insulation part is arranged between every two adjacent battery cells, each first heat insulation part comprises a longitudinal heat insulation part and a transverse heat insulation part, and the longitudinal heat insulation parts vertically extend and are fixed to the battery cells on the two sides respectively; the transverse heat insulation part horizontally extends and is respectively fixed with the battery cells on the two sides, and the transverse heat insulation part is positioned at the bottom ends of the battery cells. The transverse heat insulation parts can block the heat conduction structural adhesive placed below the battery cells, the heat insulation effect between the battery cells is good, and the safety of the battery module is good.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to a battery core assembly and a battery module. Background Art

[0002] With the development of the new energy industry, CTP (Cell to Pack) battery packs have become the mainstream of current development, and safety performance has always been one of the important performances of battery packs.

[0003] In current CTP battery packs, in order to prevent thermal runaway of a single cell from causing thermal runaway of the entire battery pack, adjacent cells are generally insulated by aerogel to block the spread of heat from the runaway single cell to the surrounding cells, reducing damage to the battery pack and incidental destructive effects. A thermally conductive structural adhesive is provided at the bottom of the cell to dissipate heat from the cell to prevent thermal runaway due to excessive cell temperature. However, the thermally conductive structural adhesive easily overflows between the cells, affecting the insulation effect and the position accuracy between the cells; and the price of aerogel is expensive, resulting in an increase in the cost of the battery pack. Utility Model Content

[0004] The utility model aims to provide a battery core assembly and a battery module, which can solve the problem that the heat-conducting structural glue overflows between the battery cores and affects the heat insulation effect.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A battery cell assembly includes a battery cell row, wherein the battery cell row includes a plurality of battery cells arranged along a first direction, wherein a first heat insulating member is provided between two adjacent battery cells in the battery cell row, and wherein the first heat insulating member includes:

[0007] A longitudinal heat insulating portion, the longitudinal heat insulating portion extending vertically and being respectively fixed to the battery cells on both sides;

[0008] A transverse heat insulating portion extends horizontally and is respectively fixed to the battery cells at both sides, and the transverse heat insulating portion is located at the bottom end of the battery cell.

[0009] As an optional solution of the above-mentioned battery core assembly, the hardness of the longitudinal heat insulation part is greater than the hardness of the transverse heat insulation part.

[0010] As an optional solution of the above-mentioned battery cell assembly, the number of the longitudinal heat insulating parts is at least two, and the at least two longitudinal heat insulating parts are arranged at intervals along the width direction of the battery cell;

[0011] and / or, the bottom end of the transverse heat insulation portion is not higher than the bottom end of the longitudinal heat insulation portion;

[0012] And / or, the bottom end of the longitudinal insulation part is connected to the transverse insulation part.

[0013] As an optional solution of the above-mentioned battery core assembly, the first thermal insulation member is a foam thermal insulation member;

[0014] And / or, both sides of the first thermal insulation member facing the battery core are provided with adhesive layers, and the adhesive layers fix the first thermal insulation member and the battery core.

[0015] As an optional solution of the above-mentioned battery cell assembly, the number of the battery cell rows is set to at least two, and at least two of the battery cell rows are arranged along a second direction, and the second direction is perpendicular to the first direction;

[0016] A second heat insulating member is arranged between two adjacent rows of battery cells, and the second heat insulating member is respectively fixed to the battery cells on both sides.

[0017] As an optional solution of the above-mentioned battery cell assembly, the second thermal insulation member includes a plurality of lateral thermal insulation portions, and the number of the lateral thermal insulation portions is the same as the number of the battery cells in the battery cell row;

[0018] In two adjacent battery cell rows, the lateral heat insulation portion is disposed between two opposite battery cells.

[0019] As an optional solution of the above-mentioned battery core assembly, the second thermal insulation member includes at least two thermal insulation layers stacked along the second direction, and the battery core is bonded and fixed to the adjacent thermal insulation layers.

[0020] As an optional solution of the above-mentioned battery core assembly, at least one layer of the thermal insulation layer is a polycarbonate thermal insulation layer;

[0021] And / or, at least one of the thermal insulation layers is a polyimide thermal insulation layer.

[0022] As an optional solution of the above-mentioned battery cell assembly, the battery cell assembly also includes insulating end plates, and the insulating end plates are provided at both ends of each battery cell row along the first direction, and the insulating end plates are fixed to the battery cells at the ends of the battery cell row.

[0023] As an optional solution for the above-mentioned battery cell assembly, the insulating end plate includes an insulating plate and a heat insulating sheet that are stacked and connected, and the heat insulating sheet is bonded and fixed to the battery cell.

[0024] As an optional solution of the above-mentioned battery core assembly, the insulating plate is a polycarbonate insulating plate;

[0025] And / or, the thermal insulation sheet is a foam thermal insulation sheet;

[0026] And / or, the insulating plate and the thermal insulation sheet are bonded and fixed.

[0027] A battery module comprises a box body and the above-mentioned battery cell assembly, wherein the box body is provided with a receiving groove, the battery cell assembly is arranged in the receiving groove, and a heat-conducting structural adhesive layer is arranged between the battery cell assembly and the bottom surface of the receiving groove.

[0028] As an optional solution of the above battery module, the box body includes at least two expansion beams, at least two of the expansion beams are arranged at intervals along the first direction, and the accommodating groove is formed between two adjacent expansion beams;

[0029] The battery module further includes an output pole seat, and the output pole seat is arranged on the expansion beam.

[0030] As an optional solution of the above battery module, the battery module further includes a foamed glue layer, and the foamed glue layer is located between the battery cell assembly and the side wall of the accommodating groove.

[0031] Beneficial effects of the utility model:

[0032] In the battery cell assembly provided by the utility model, the first thermal insulation component is used to isolate the heat transfer between two adjacent battery cells. On the one hand, it can prevent the thermal runaway of a single battery cell from spreading to other battery cells; on the other hand, it can keep the battery cells warm, control the temperature difference between the battery cells, and avoid affecting the performance and service life of the battery module due to the large temperature difference.

[0033] In the first thermal insulation member, both the longitudinal thermal insulation part and the transverse thermal insulation part can play a role in thermal insulation, and can be tightly connected to two adjacent battery cells, thereby improving the fixing effect, so that multiple battery cells in the battery cell row are connected as one body, which is convenient for disassembly and assembly. The transverse thermal insulation part is located at the bottom of two adjacent battery cells, and can also play a role in blocking the conductive structural glue at the bottom of the battery cells, preventing the conductive structural glue from overflowing between the battery cells and affecting the thermal insulation effect.

[0034] The battery module provided by the utility model comprises the above-mentioned battery cell assembly, which can solve the problem that the heat-conducting structural glue overflows between the battery cells and affects the heat insulation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of the battery module provided by the utility model;

[0036] Figure 2 It is a schematic diagram of the structure after the box provided by the utility model is assembled with a battery core assembly;

[0037] Figure 3 It is a schematic diagram of the structure of the battery core assembly provided by the utility model in an unassembled state;

[0038] Figure 4 It is a schematic structural diagram of the battery core and the first heat insulating member provided by the utility model after being assembled.

[0039] In the figure:

[0040] 10. Box body; 101. Accommodating groove; 11. Expansion beam; 20. Battery cell assembly; 21. Battery cell; 22. First thermal insulation member; 221. Longitudinal thermal insulation portion; 222. Transverse thermal insulation portion; 23. Insulating end plate; 231. Insulating plate; 232. Thermal insulation sheet; 24. Lateral thermal insulation portion; 30. Output pole seat; 40. Foam rubber layer. DETAILED DESCRIPTION

[0041] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0042] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0044] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0045] like Figure 1 and Figure 2As shown, this embodiment provides a battery module, including a box body 10 and a battery cell assembly 20 disposed in the box body 10. A receiving groove 101 is provided in the box body 10, and the receiving groove 101 is used to place the battery cell assembly 20, so as to position the battery cell assembly 20 and improve the stability of the battery cell assembly 20 in the box body 10.

[0046] The battery cell assembly 20 includes a battery cell row, and the battery cell row includes a plurality of battery cells 21 arranged along a first direction. Figure 1 X direction. The battery cell 21 may be a square battery cell. In order to increase the number of battery cells 21 in each battery cell row in the box 10, the multiple battery cells 21 in the battery cell row are arranged along the thickness direction, that is, the thickness direction of the battery cell 21 coincides with the first direction. Since the thickness of the battery cell 21 is relatively small, by arranging the multiple battery cells 21 along the thickness direction, the number of battery cells 21 in each battery cell row can be increased on the basis of keeping the size of the accommodating groove 101 unchanged, thereby making the battery cell arrangement more compact and increasing the total number of battery cells 21 in the box 10.

[0047] In this embodiment, four accommodating grooves 101 are formed in the box body 10, and a battery cell assembly 20 is arranged in each accommodating groove 101. By dividing the space in the box body 10 into a plurality of accommodating grooves 101, the plurality of battery cell assemblies 20 in the box body 10 can be separated to prevent a failure of a battery cell assembly 20 from affecting other battery cell assemblies 20.

[0048] In order to divide the space inside the box 10 into a plurality of accommodating grooves 101, the box 10 includes a box body and at least two expansion beams 11. The box body is a rectangular parallelepiped structure with an open top. The at least two expansion beams 11 are arranged at intervals along a first direction and are disposed inside the box body, and an accommodating groove 101 is formed between two adjacent expansion beams 11.

[0049] In this embodiment, three expansion beams 11 are provided, and the box body 10 also includes a cross beam perpendicular to the expansion beam 11, which extends along a first direction and is vertically connected to each expansion beam 11. The three expansion beams 11 and one cross beam are in a W shape to cooperate with the inner wall of the box body to form four accommodating grooves 101.

[0050] In order to prevent the battery cell 21 from overheating and causing thermal runaway during operation, a heat dissipation structure is formed in the box 10, and the heat dissipation structure is used to dissipate heat from the battery cell 21 to control the temperature of the battery cell 21. In this embodiment, the heat dissipation structure is a thermally conductive structural adhesive, which has a large thermal conductivity and high thermal conductivity efficiency, and can transfer the heat generated by the battery cell 21 to the outside in time to prevent the battery cell 21 from thermal runaway.

[0051] To ensure the safety of the battery module, in each battery cell row, a first thermal insulation member 22 is arranged between two adjacent battery cells 21. The material of the first thermal insulation member 22 is a thermal insulation material. The first thermal insulation member 22 is used to isolate the heat transfer between two adjacent battery cells 21. On the one hand, it can prevent the thermal runaway of a single battery cell 21 from spreading to other battery cells 21; on the other hand, it can keep the battery cells 21 warm, control the temperature difference between the battery cells 21, and avoid affecting the performance and service life of the battery module due to the large temperature difference.

[0052] In this embodiment, Figure 4 As shown, the first thermal insulation member 22 includes a longitudinal thermal insulation portion 221 and a transverse thermal insulation portion 222. The longitudinal thermal insulation portion 221 extends vertically and is respectively fixed to the battery cells 21 on both sides; the transverse thermal insulation portion 222 extends horizontally and is respectively fixed to the battery cells 21 on both sides, and the transverse thermal insulation portion 222 is located at the bottom of the battery cell 21. Both the longitudinal thermal insulation portion 221 and the transverse thermal insulation portion 222 can play a role in thermal insulation, and can be tightly connected to two adjacent battery cells 21 to improve the fixing effect, so that multiple battery cells 21 in the battery cell row are connected as a whole, which is convenient for disassembly and assembly. The transverse thermal insulation portion 222 is located at the bottom of two adjacent battery cells 21, and can also play a role in blocking the conductive structural glue at the bottom of the battery cell 21 to prevent the conductive structural glue from overflowing between the battery cells 21 and affecting the thermal insulation effect.

[0053] In this embodiment, the first thermal insulation member 22 may be a foam thermal insulation member. Foam has good thermal insulation effect and low price, which is conducive to reducing the thermal insulation cost between the battery cells 21, thereby improving the competitiveness of the battery module. Optionally, the first thermal insulation member 22 may be XPP foam, IXPP foam or PP foam.

[0054] To facilitate the fixing of the first heat insulating member 22 to two adjacent battery cells 21, the first heat insulating member 22 is double-sided adhesive. That is, both sides of the longitudinal heat insulating portion 221 and the transverse heat insulating portion 222 facing the battery cells 21 are provided with adhesive layers, and the corresponding battery cells 21 are bonded by the adhesive layers.

[0055] Preferably, the hardness of the longitudinal heat insulating portion 221 can be greater than the hardness of the transverse heat insulating portion 222. The longitudinal heat insulating portion 221 is relatively hard and can provide sufficient pre-tightening force for two adjacent battery cells 21 to improve the fixing effect of the two adjacent battery cells 21. The pre-tightening force can offset part of the expansion force generated when the battery cell 21 is working, thereby ensuring the position accuracy of multiple battery cells 21 in the same battery cell row and avoiding the misalignment of the battery cells 21. The transverse heat insulating portion 222 has a relatively low hardness and is used as a rubber stopper to buffer the expansion force of the thermal conductive structural glue.

[0056] Combination Figure 3 and Figure 4 As shown, the thickness direction of the battery cell 21 is the first direction, the length direction of the battery cell 21 is the second direction, the first direction is perpendicular to the second direction, and the second direction is Figure 1 The first heat insulating member 22 is attached to the front or back surface of the battery cell 21 with a larger area (ie, the surface formed along the length direction and the height direction), which is hereinafter referred to as the A surface of the battery cell 21.

[0057] In order to improve the fixing effect of adjacent battery cells 21, the number of longitudinal insulation parts 221 on each A surface can be set to at least two, and at least two longitudinal insulation parts 221 are arranged at intervals along the length direction of the A surface, which is beneficial to increase the connection surface between two adjacent battery cells 21 and improve the fixing effect and insulation effect.

[0058] In this embodiment, Figure 4 As shown, there are two longitudinal heat insulating parts 221 on the A surface of the battery cell 21, and the two longitudinal heat insulating parts 221 are respectively located at the two side edges of the A surface to increase the distance between the two longitudinal heat insulating parts 221, and the A surfaces of two adjacent battery cells 21 are fixed by the two side edges to improve the fixing effect. The two longitudinal heat insulating parts 221 and one transverse heat insulating part 222 are arranged roughly in a U shape.

[0059] Optionally, the length of the longitudinal heat insulating portion 221 may be slightly smaller than the height of the battery cell 21 , or the length of the longitudinal heat insulating portion 221 may be equal to the height of the battery cell 21 .

[0060] Optionally, the number of the longitudinal heat insulating portions 221 may also be set to be more than two, such as three, four or more, so as to improve the fixing effect and heat insulating effect between two adjacent battery cells 21 as required.

[0061] In order to improve the blocking effect of the thermal conductive structure adhesive, the transverse thermal insulation adhesive is located at the bottom edge of the battery cell 21 to reduce the contact between the thermal conductive structure adhesive and the A surface of the battery cell 21.

[0062] In this embodiment, the transverse insulation portion 222 is located between the two longitudinal insulation portions 221, and the bottom end of the transverse insulation portion 222 is flush with the bottom end of the longitudinal insulation portion 221, so that the longitudinal insulation portion 221 and the transverse insulation portion 222 cooperate to block the thermal conductive structural adhesive to reduce the contact between the thermal conductive structural adhesive and the A surface of the battery cell 21.

[0063] In other embodiments, the bottom end of the transverse insulation portion 222 may be lower than the bottom end of the longitudinal insulation portion 221 , for example, the entire transverse insulation portion 222 is located below the longitudinal insulation portion 221 , and the thermal conductive structural adhesive is only blocked by the transverse insulation portion 222 .

[0064] In this embodiment, the longitudinal insulation part 221 and the transverse insulation part 222 are split structures, that is, the longitudinal insulation part 221 and the transverse insulation part 222 are not connected, which facilitates the preparation of the longitudinal insulation part 221 and the transverse insulation part 222 with different hardness and reduces the processing difficulty.

[0065] In some embodiments, the bottom end of the longitudinal heat insulation portion 221 may be connected to the transverse heat insulation portion 222 , and the two may be an integrally formed structure or may be connected after forming.

[0066] The longitudinal heat insulating part 221 and the transverse heat insulating part 222 are both long strip structures. In order to avoid wasting materials by mistake when assembling the battery cell row, the width of the longitudinal heat insulating part 221 can be greater than the width of the transverse heat insulating part 222. On the one hand, the transverse heat insulating part 222 and the longitudinal heat insulating part 221 can be distinguished by the width, reducing the probability of assembly errors; on the other hand, the contact area between the longitudinal heat insulating part 221 and the two adjacent battery cells 21 can be increased, thereby improving the fixing effect.

[0067] To increase the number of cells 21 in the cell assembly 20, the number of cell rows in each cell assembly 20 can be set to at least two, and at least two cell rows are arranged along the second direction. In this embodiment, each cell assembly 20 includes two cell rows, and the two cell rows are arranged along the length direction of the cell 21.

[0068] In order to make the arrangement of the battery cell rows more compact, the interval between two battery cells 21 facing each other in two adjacent battery cell rows is small, and may even touch each other.

[0069] In order to improve the thermal insulation effect between adjacent rows of battery cells, a second thermal insulation member is provided between two adjacent rows of battery cells. The second thermal insulation member is made of thermal insulation material and is fixed to the battery cells 21 on both sides. By providing the second thermal insulation member, the heat transfer between the two adjacent rows of battery cells can be isolated, and the thermal runaway of the battery cells 21 in a certain row of battery cells can be prevented from spreading to the adjacent row of battery cells. The second thermal insulation member is respectively connected to the battery cells 21 on both sides, and at least two rows of battery cells in the same battery cell assembly 20 can be connected into one body, so as to improve the modularity of the battery cell assembly 20, improve the position accuracy of the multiple battery cells 21 in the battery cell assembly 20, and facilitate the assembly of the battery cell assembly 20.

[0070] In order to ensure the relative position accuracy of the two battery cell rows, the second thermal insulation component includes a plurality of lateral thermal insulation parts 24. The plurality of lateral thermal insulation parts 24 are split structures. The number of lateral thermal insulation parts 24 is the same as the number of battery cells 21 in the battery cell row, so that a lateral thermal insulation part 24 is provided between every two relatively arranged battery cells 21. By connecting the two relatively arranged battery cells 21 through the lateral thermal insulation parts 24, not only can the thermal insulation effect be achieved, but also the position accuracy of the two battery cells 21 at the corresponding positions can be improved, thereby ensuring that the two adjacent battery cell rows can be arranged directly opposite each other.

[0071] like Figure 3As shown, the lateral heat insulating portion 24 is fixed to the side of the battery cell 21 with a smaller area, that is, the surface formed by the thickness direction and the height direction of the battery cell 21, hereinafter referred to as the B surface of the battery cell 21. In order to improve the heat insulation effect, the shape of the lateral heat insulating portion 24 is the same as the shape of the B surface of the battery cell 21, and the size of the lateral heat insulating portion 24 is equal to or slightly smaller than the size of the B surface of the battery cell 21, so that the lateral heat insulating portion 24 can basically completely cover the B surface of the battery cell 21, thereby improving the heat insulation effect.

[0072] Optionally, the lateral heat insulating portion 24 may be double-sidedly adhesive, that is, both side surfaces of the lateral heat insulating portion 24 facing the adjacent battery cells 21 are provided with adhesive layers, and the lateral heat insulating portion 24 and the battery cells 21 are fixed by the adhesive layers.

[0073] In order to improve the thermal insulation effect, the lateral insulation part 24 includes at least two thermal insulation layers stacked along the second direction. The thermal insulation effect is improved by setting at least two thermal insulation layers, and different thermal insulation materials can be selected to make corresponding thermal insulation layers according to the thermal insulation performance requirements, thereby controlling the thermal insulation cost while meeting the thermal insulation requirements.

[0074] In this embodiment, the lateral heat insulation part 24 includes two heat insulation layers, and the heat insulation materials of the two heat insulation layers are different. The material of one heat insulation layer can be polycarbonate (PC) material, and the material of the other heat insulation layer can be polyimide (PI) material. By compounding the PC material and the PI material to form the side heat insulation part, the heat insulation effect can be ensured, the risk of thermal runaway of the battery cell assembly 20 can be reduced, the cost of the heat insulation material can be reduced, and the competitiveness of the battery module can be improved.

[0075] In other embodiments, the number of insulation layers in the lateral insulation part 24 may be one, three, four or more; the materials of the insulation layers in the lateral insulation part 24 may be the same or different, and the specific materials may be selected according to the cost and insulation requirements.

[0076] Optionally, two adjacent heat-insulating layers may be bonded and fixed by an adhesive layer to facilitate preparation.

[0077] Optionally, in the battery cell assembly 20, in the battery cell row located on the outside, a lateral heat insulation portion 24 may also be bonded to the side surface of the battery cell 21 facing the side wall of the accommodating groove 101. The lateral heat insulation portion 24 can not only play a role in heat insulation, but also prevent the battery cell 21 from directly contacting the box body 10 and short-circuiting, thereby playing an insulating role.

[0078] In this embodiment, the battery cell assembly 20 also includes an insulating end plate 23. Insulating end plates 23 are provided at both ends of each battery cell row along the first direction. The insulating end plates 23 are fixed to the battery cells 21 at the ends of the battery cell row. The insulating end plates 23 are used to insulate the battery cells 21 from the box body 10 to prevent the battery cells 21 from short circuiting.

[0079] In the prior art, the insulating end plate 23 is generally formed by die casting, and the two battery cells 21 at the same end of two adjacent battery cell rows share one insulating end plate 23, which results in a large size of the insulating end plate 23, high mold cost, and great packaging difficulty. To solve the above problems, in this embodiment, each battery cell 21 at the end of each battery cell row is respectively provided with an insulating end plate 23, the insulating end plate 23 has a small specification, low mold opening cost, reduces the difficulty of production and packaging, and is conducive to reducing production costs.

[0080] In this embodiment, the insulating end plate 23 is formed by a die-cutting process. The die-cutting process has a lower cost than the die-casting process, which is conducive to further reducing the production cost.

[0081] Optionally, the insulating end plate 23 includes an insulating plate 231 and a heat insulating sheet 232 which are stacked and connected, and the heat insulating sheet 232 is bonded and fixed to the battery cell 21. The insulating plate 231 is made of an insulating material, and the insulating plate 231 abuts against the inner wall of the receiving groove 101 to achieve insulation between the battery cell 21 and the box body 10; the heat insulating sheet 232 is arranged on the side of the insulating plate 231 facing the battery cell 21, and the heat insulating sheet 232 can play a role in heat preservation and heat insulation to avoid excessive temperature difference between the battery cells 21. Optionally, the insulating plate 231 and the heat insulating sheet 232 can be bonded and fixed to simplify the process.

[0082] Optionally, the insulating plate 231 may be a polycarbonate insulating plate, which has good insulating effect and low cost.

[0083] Optionally, the heat insulating sheet 232 may be a foam heat insulating sheet, which not only has a heat insulating effect, but also can buffer the force exerted on the side wall of the accommodating groove 101 when the battery cell 21 expands, so as to avoid damage to the box body 10 or the battery cell 21. Figure 3 As shown, the insulating plate 231 is in contact with the expansion beam 11 , and the heat insulating sheet 232 made of foam can buffer the force of the battery cell 21 on the expansion beam 11 , thereby preventing the expansion beam 11 from being deformed due to excessive force.

[0084] In order to improve the stability of the battery cell 21 in the box 10, the battery module further includes a foaming glue layer 40, which is located between the battery cell assembly 20 and the side wall of the receiving groove 101. By pouring foaming glue between the battery cell assembly 20 and the receiving groove 101, the foaming glue can be filled in the gap between the battery cell assembly 20 and the receiving groove 101 after foaming, thereby forming the foaming glue layer 40. The foaming glue layer 40 can improve the fixing effect of the battery cell assembly 20 and the box 10, prevent the battery cell assembly 20 from shaking in the box 10, increase the whole package mode, and strengthen the structural strength of the whole package.

[0085] The battery module also includes a signal acquisition component, which is used to connect multiple cells 21 in the cell assembly 20 to achieve series and parallel connection of multiple cells 21. Among them, the signal acquisition component includes an output row and an input row for input and output of electrical signals. In the prior art, the output pole seat 30 is also integrally formed on the die-cast insulating end plate 23, and the output row and the input row are connected to the output pole seat 30. The output pole seat 30 is integrally formed with the insulating end plate 23, which has a complex structure, is difficult to process, and has high cost.

[0086] To solve the above problems, in this embodiment, the battery module further includes an output pole seat 30, which is arranged on the expansion beam 11. By setting the output pole seat 30 and the insulating end plate 23 as a separate structure, the processing difficulty and cost can be reduced. In addition, the output pole seat 30 is located on the expansion beam 11, and the installation space is large, which is convenient for installation, and is conducive to ensuring the fixing effect of the output pole seat 30 and the output row or the input row.

[0087] In order to facilitate the positioning of the output pole seat 30 , a positioning groove is provided on the expansion beam 11 , and the output pole seat 30 is arranged in the positioning groove to facilitate the positioning of the output pole seat 30 .

[0088] Optionally, the output pole seat 30 is detachably connected to the expansion beam 11, which is convenient for maintaining or replacing the output pole seat 30. The output pole seat 30 can be fixed to the expansion beam 11 by screws, which is low in cost and convenient for disassembly and assembly.

[0089] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A battery cell assembly, comprising a battery cell row, wherein the battery cell row comprises a plurality of battery cells (21) arranged along a first direction, characterized in that: In the battery cell row, a first heat insulating member (22) is provided between two adjacent battery cells (21), and the first heat insulating member (22) comprises: A longitudinal heat insulating portion (221), the longitudinal heat insulating portion (221) extending vertically and respectively fixed to the battery cells (21) on both sides; A transverse heat insulating portion (222), the transverse heat insulating portion (222) extending horizontally and respectively fixed to the battery cores (21) on both sides, the transverse heat insulating portion (222) being located at the bottom end of the battery core (21).

2. The battery cell assembly according to claim 1, characterized in that: The hardness of the longitudinal heat insulation part (221) is greater than the hardness of the transverse heat insulation part (222).

3. The battery core assembly according to claim 1, characterized in that: The number of the longitudinal heat insulating portions (221) is at least two, and the at least two longitudinal heat insulating portions (221) are arranged at intervals along the width direction of the battery core (21); and / or, the bottom end of the transverse heat insulation portion (222) is not higher than the bottom end of the longitudinal heat insulation portion (221); And / or, the bottom end of the longitudinal heat insulation part (221) is connected to the transverse heat insulation part (222).

4. The battery core assembly according to claim 1, characterized in that: The first heat insulating member (22) is a foam heat insulating member; And / or, both sides of the first thermal insulation member (22) facing the battery core (21) are provided with adhesive layers, and the adhesive layers fix the first thermal insulation member (22) and the battery core (21).

5. The battery cell assembly according to any one of claims 1 to 4, characterized in that: The number of the battery cell rows is at least two, and at least two of the battery cell rows are arranged along a second direction, and the second direction is perpendicular to the first direction; A second heat insulating member is provided between two adjacent rows of battery cells, and the second heat insulating member is respectively fixed to the battery cells (21) on both sides.

6. The battery cell assembly according to claim 5, characterized in that: The second heat insulating member comprises a plurality of lateral heat insulating portions (24), and the number of the lateral heat insulating portions (24) is the same as the number of the battery cells (21) in the battery cell row; In two adjacent rows of battery cells, the lateral heat insulation portion (24) is provided between two opposing battery cells (21).

7. The battery cell assembly according to claim 5, characterized in that: The second heat insulating member comprises at least two heat insulating layers stacked along a second direction, and the battery core (21) is bonded and fixed to adjacent heat insulating layers.

8. The battery cell assembly according to claim 7, characterized in that: At least one of the heat-insulating layers is a polycarbonate heat-insulating layer; And / or, at least one of the thermal insulation layers is a polyimide thermal insulation layer.

9. The battery cell assembly according to any one of claims 1 to 4, characterized in that: The battery cell assembly further comprises an insulating end plate (23), and both ends of each battery cell row along the first direction are provided with the insulating end plate (23), and the insulating end plate (23) is fixed to the battery cell (21) at the end of the battery cell row.

10. The battery core assembly according to claim 9, characterized in that: The insulating end plate (23) comprises an insulating plate (231) and a heat insulating sheet (232) which are stacked and connected, and the heat insulating sheet (232) is bonded and fixed to the battery core (21).

11. The battery core assembly according to claim 10, characterized in that: The insulating plate (231) is a polycarbonate insulating plate; And / or, the thermal insulation sheet (232) is a foam thermal insulation sheet; And / or, the insulating plate (231) and the heat insulation sheet (232) are bonded and fixed.

12. A battery module, characterized in that: It comprises a box body (10) and a battery cell assembly as described in any one of claims 1 to 11, wherein a receiving groove (101) is arranged in the box body (10), the battery cell assembly is arranged in the receiving groove (101), and a thermal conductive structural adhesive layer is arranged between the battery cell assembly and the bottom surface of the receiving groove (101).

13. The battery module according to claim 12, characterized in that: The box body (10) comprises at least two expansion beams (11), the at least two expansion beams (11) are arranged at intervals along a first direction, and the receiving groove (101) is formed between two adjacent expansion beams (11); The battery module further comprises an output pole seat (30), wherein the output pole seat (30) is arranged on the expansion beam (11).

14. The battery module according to claim 12, characterized in that: The battery module further comprises a foamed adhesive layer (40), wherein the foamed adhesive layer (40) is located between the battery cell assembly and the side wall of the accommodating groove (101).

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