Battery cell assembly, battery module and battery pack

Abstract

The utility model provides a battery cell assembly, a battery module and a battery pack, and the battery cell assembly comprises: a battery pack comprising at least two battery cells stacked along a first direction; the fixing plate is connected to at least one end of the battery pack in the first direction; the fastener penetrates through the fixing plate from the top of the fixing plate, and the upper portion of the fastener abuts against the fixing plate; the bridging bar sheet is erected above the fixed plate and is electrically connected with the pole; and an insulating gap and / or an insulating part are / is arranged between the bridging bar sheet and the upper part of the fastener. According to the battery cell assembly, the battery module and the battery pack provided by the invention, the insulating gap and / or the insulating part are / is arranged between the bridging piece and the upper part of the fastener, so that the insulating property between the bridging piece and the upper part of the fastener can be effectively improved. Even if the battery cell in the battery pack is in thermal runaway, the short-circuit arcing phenomenon between the bridging bar sheet and the fastener can be effectively inhibited, and the safety performance of the battery cell assembly can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power batteries, and in particular to a battery cell assembly, a battery module and a battery pack. BACKGROUND

[0002] With the increasing demand for the energy density of the battery pack, the number of battery cells arranged in the battery pack is also increasing. In order to reliably fix each battery cell in the battery pack, the battery cells can be stacked into a battery module, and an end plate is arranged at the end of the battery module in the stacking direction of the battery cells, so as to be connected with the box of the battery pack through the end plate.

[0003] When a plurality of battery modules are arranged into a long module along the stacking direction of the battery cells, a middle plate can be arranged between two battery modules to improve the overall rigidity of the long module. The adjacent battery modules in the long module can be electrically connected through the bar piece spanning the middle plate. However, based on the assembly requirement, the head of the bolt for fixing the middle plate is usually arranged on the same side (usually the top of the middle plate) of the bar piece arranged on the middle plate, which causes the risk of short circuit and arc between the metal bolt and the metal bar piece. UTILITY MODEL CONTENT

[0004] Therefore, the present application aims to provide a battery cell assembly, a battery module and a battery pack to at least partially solve the problem of short circuit and arc between the head of the bolt for fixing the middle plate and the bar piece.

[0005] To achieve the above purpose, the present application provides a battery cell assembly in the first aspect, comprising: a battery module comprising at least two battery cells stacked along a first direction, each battery cell comprising a battery cell body and a pole, the pole being connected to the top of the battery cell body; a fixing plate connected to at least one end of the battery module along the first direction; a fastener passing through the fixing plate from the top of the fixing plate, the upper part of the fastener abutting against the fixing plate; a cross-bar piece erected above the fixing plate and electrically connected with the pole; and an insulating gap and / or an insulating piece arranged between the cross-bar piece and the upper part of the fastener.

[0006] Optionally, the fixing plate is formed with a receiving cavity, the top of the fixing plate is provided with a receiving opening communicating with the receiving cavity, and the upper part of the fastener is adapted to be arranged in the receiving cavity through the receiving opening; along the height direction of the fixing plate, the gap between the upper part of the fastener and the cross-bar piece is configured as the insulating gap.

[0007] Optionally, the upper part of the fastener is located above the fixing plate and abuts against the top of the fixing plate; the middle part of the bridging plate is arranged at one side of the upper part of the fastener along a second direction; along the second direction, a gap between the upper part of the fastener and the middle part of the bridging plate is configured as the insulation gap; the second direction, the first direction and the height direction of the fixing plate are perpendicular to each other.

[0008] Optionally, the insulation member comprises a covering body covering the upper part of the fastener.

[0009] Optionally, the insulation member comprises an insulation high-temperature-resistant layer attached to the surface of the fixing plate and located at least between the fixing plate and the bridging plate.

[0010] Optionally, the insulation high-temperature-resistant layer comprises a top covering part attached to the top of the fixing plate and two side covering parts attached to the two side walls of the fixing plate arranged opposite to each other along the first direction, and the top covering part is connected to the two side covering parts respectively.

[0011] Optionally, the top of the fixing plate is provided with a receiving opening, and the top covering part is provided with an avoiding opening avoiding the receiving opening.

[0012] Optionally, the insulation high-temperature-resistant layer further comprises a folding part, only one side edge of the folding part is connected to the side covering part or the top covering part; the folding part has an open state separated from the top of the fixing plate and a connected state connected to the top of the fixing plate and covering the receiving opening.

[0013] Optionally, the battery cell assembly comprises at least two battery groups arranged at intervals along the first direction, the fixing plate comprises a middle plate connected between two adjacent battery groups and / or an end plate connected to a battery cell at the head end or a battery cell at the tail end along the first direction.

[0014] Based on the same inventive concept, the second aspect of the present application further provides a battery module comprising the battery cell assembly according to the first aspect.

[0015] Based on the same inventive concept, the third aspect of the present application further provides a battery pack comprising the battery cell assembly according to the first aspect.

[0016] From the above, it can be seen that the electric cell assembly, the battery module and the battery pack provided by the application can effectively improve the insulation performance between the jumper bar and the upper part of the fastener by arranging the insulation gap and / or the insulating piece between the jumper bar and the upper part of the fastener. Even if the electric cell in the battery pack appears thermal runaway, the short circuit arc phenomenon between the jumper bar and the fastener can be effectively inhibited, which helps to improve the safety performance of the electric cell assembly. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the application or the related art, the drawings needed to be used in the embodiments or the related art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 The first structure of the electric cell assembly is shown in the schematic diagram.

[0019] Figure 2 The second structure of the electric cell assembly is shown in the schematic diagram.

[0020] Figure 3 The third structure of the electric cell assembly is shown in the schematic diagram.

[0021] Figure 4 The first structure of the A part is shown in the enlarged schematic diagram. Figure 3

[0022] The second structure of the A part is shown in the enlarged schematic diagram. Figure 5 Figure 3 The third structure of the A part is shown in the enlarged schematic diagram.

[0023] Figure 6 Figure 3 The schematic diagram of installing the fastener to the fixed plate is shown in the enlarged schematic diagram.

[0024] Figure 7 The schematic diagram of switching the folded part to the connected state is shown in the enlarged schematic diagram.

[0025] Figure 8 The schematic diagram of switching the folded part to the connected state is shown in the enlarged schematic diagram.

[0026] Explanation of reference signs:

[0027] 100, battery pack; 110, electric cell; 111, electric cell body; 112, pole;

[0028] 200, fixed plate; 210, middle plate; 220, end plate; 230, accommodating cavity; 240, accommodating opening;

[0029] ​​300, fastener; 310, upper part of fastener;

[0030] 400, cross-over tab;

[0031] 510, cover; 520, insulating high-temperature-resistant layer; 521, top cover part; 5211, avoiding opening; 522, side cover part; 523, folding part;

[0032] 600, connecting tab. DETAILED DESCRIPTION

[0033] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the embodiments and the accompanying drawings.

[0034] It should be noted that the relative arrangement of the components, numerical expressions and values set forth in these embodiments are not intended to limit the scope of the present application unless otherwise specified.

[0035] It should be understood that the sizes of the various parts shown in the drawings are not necessarily drawn to scale for the sake of convenience of description.

[0036] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the scope of the application or its application or uses.

[0037] It should be noted that unless otherwise defined, technical or scientific terms used in the embodiments of the present application should be understood as their common meanings to those skilled in the art. The terms "first", "second" and similar terms used in the embodiments of the present application do not represent any order, number or importance, but are only used to distinguish different components. The terms "include" or "contain" and similar terms mean that the elements or objects before the terms encompass the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connected" or "linked" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right" and the like are only used to represent relative positional relationships, and when the absolute positions of the described objects are changed, the relative positional relationships may also be changed accordingly.

[0038] Figure 1 A schematic view of the first structure of the battery cell assembly is shown.

[0039] As Figure 1 The embodiments of the present application provide a battery cell assembly, comprising: a battery pack 100, comprising a plurality of battery cells 110 arranged along a first direction (such as the length direction of the battery pack 100) and a plurality of connecting tabs 600 arranged along a second direction (such as the width direction of the battery pack 100) perpendicular to the first direction. Figure 1The battery pack 100 includes at least two electric cells 110 stacked along a first direction (e.g., the X direction in the figure), each of which includes an electric cell body 111 and a pole 112 connected to the top of the electric cell body 111.

[0040] Exemplarily, the pole 112 includes a positive pole and a negative pole connected to the top of the same electric cell 110 body.

[0041] Exemplarily, in the same battery pack 100, two adjacent electric cells 110 can be electrically connected through a connecting tab 600. For example, the connecting tab 600 can be directly connected to the positive pole of one of the electric cells 110 and the negative pole of the other electric cell 110, respectively, so as to connect the two electric cells 110 in series.

[0042] In order to reliably fix the battery pack 100 in the box of the battery pack, the electric cell assembly further includes a fixing plate 200 connected to at least one end of the battery pack 100 along the first direction, and a fastener 300 passing through the fixing plate 200 from the top of the fixing plate 200, the upper part 310 of the fastener abutting against the fixing plate 200.

[0043] Exemplarily, the top of the fixing plate 200 is provided with a through hole penetrating downward, and the fastener 300 can pass through the through hole, and the lower end of the fastener 300 can extend out of the fixing plate 200 and be connected to the box of the battery pack.

[0044] Exemplarily, the fastener 300 can be a long bolt or a threaded column connected with a nut.

[0045] Exemplarily, when the fastener 300 is a long bolt, the upper part 310 of the fastener is a nut (or a bolt head); when the fastener 300 is a threaded column connected with a nut, the upper part 310 of the fastener is a screwed nut. By abutting the upper part 310 of the fastener against the fixing plate 200, the fixing plate 200 can be reliably connected to the box of the battery pack (e.g., the bottom plate or the bottom beam of the lower box).

[0046] Exemplarily, the upper part 310 of the fastener can protrude out of the top of the fixing plate 200, in which case the upper part 310 of the fastener abuts against the top of the fixing plate 200 to achieve the downward pressing and fixing of the fixing plate 200; or the upper part 310 of the fastener can be located inside the fixing plate 200, in which case the upper part 310 of the fastener abuts against the internal structure of the fixing plate 200 to achieve the downward pressing and fixing of the fixing plate 200. In other words, the upper part 310 of the fastener in the embodiment includes but is not limited to the part of the fastener 300 protruding out of the top of the fixing plate 200, or the upper end part of the fastener 300 (i.e., the part close to the top of the fixing plate 200).

[0047] Exemplarily, the fixing plate 200 can be a metal structure, an insulating structure, or a metal structure coated with an insulating material layer.

[0048] In order to enable the battery pack 100 to be electrically connected with an external circuit (including an external device or another battery pack 100), the cell assembly can further include a jumper bar 400 arranged above the fixing plate 200 and electrically connected with the pole 112.

[0049] Exemplarily, the jumper bar 400 can be electrically connected with the pole 112 by welding, bonding, or clamping.

[0050] The applicant has found that, taking a bolt as an example, in order to facilitate rotation of the bolt, a nut can be arranged on the top of the fixing plate 200. Since the jumper bar 400 is arranged above the fixing plate 200, when the cell 110 is internally short-circuited or mechanically damaged, a chain reaction (i.e., thermal runaway) occurs, and the cell 110 generates intense heat or gas. At this time, due to a potential difference between the nut and the jumper bar 400, the medium between the two metal structures can be broken down and discharged intensely, and an arc can be generated, i.e., a short-circuit arc phenomenon can occur between the two.

[0051] In order to reduce the risk of the short-circuit arc phenomenon, the embodiment of the present application insulates the jumper bar 400 and the upper portion 310 of the fastener, and specifically, an insulating gap and / or an insulating member is arranged between the jumper bar 400 and the upper portion 310 of the fastener.

[0052] Exemplarily, the jumper bar 400 and the upper portion 310 of the fastener can be spaced apart along the height direction (e.g., the Z direction in the figure) of the fixing plate 200 and / or along the top plane direction of the fixing plate 200, so as to form an insulating gap between the jumper bar 400 and the upper portion 310 of the fastener. Figure 1

[0053] Exemplarily, the insulating member can be connected to at least one of the fastener 300, the fixing plate 200, and the jumper bar 400 by bonding, sleeving, or clamping.

[0054] The cell assembly provided by the embodiment can effectively improve the insulation performance between the jumper bar 400 and the upper portion 310 of the fastener. Even if the cell 110 in the battery pack 100 is in thermal runaway, the short-circuit arc phenomenon between the jumper bar 400 and the fastener 300 can be effectively suppressed, which helps to improve the safety performance of the cell assembly.

[0055] As shown in Figure 1 ​In some embodiments, the upper portion 310 of the fastener is located above the fixing plate 200 and abuts against the top of the fixing plate 200; the middle portion of the jumper bar 400 is disposed at one side of the upper portion 310 of the fastener along the second direction (e.g., the Y direction in FIG. 1); and the gap between the upper portion 310 of the fastener and the middle portion of the jumper bar 400 along the second direction is configured as an insulating gap; the second direction, the first direction, and the height direction of the fixing plate 200 are perpendicular to each other. Figure 1

[0056] For example, the jumper bar 400 is electrically connected to the respective pole 112 or external circuit at positions close to the two ends.

[0057] For example, the middle portion of the jumper bar 400 is located between the upper portion 310 of the fastener and the center of the top surface of the fixing plate 200, and the space between the upper portion 310 of the fastener and the center of the top surface of the fixing plate 200 is relatively spacious, which allows the jumper bar 400 to have a larger width, thereby helping to increase the flow area of the jumper bar 400.

[0058] In the present embodiment, the middle portion of the jumper bar 400 bypasses the upper portion 310 of the fastener to form an insulating gap therebetween, thereby improving the insulation performance therebetween. At the same time, since the jumper bar 400 and the upper portion 310 of the fastener are spaced apart along the second direction, the overall size of the battery cell assembly in the height direction of the fixing plate 200 can be reduced, which helps to reduce the space occupied by the battery cell assembly in the battery pack, thereby improving the internal space utilization and energy density of the battery pack.

[0059] Figure 2 A schematic view of a battery cell assembly with a second structure is shown.

[0060] For example, the insulating member includes a cover 510 covering the upper portion 310 of the fastener. Figure 2

[0061] For example, the cover 510 can be made of insulating plastic, insulating rubber, or flexible insulating tape.

[0062] For example, the cover 510 can cover the entire outer surface of the upper portion 310 of the fastener.

[0063] In the present embodiment, the cover 510 covering the upper portion 310 of the fastener can provide comprehensive insulation protection for the upper portion 310 of the fastener, thereby effectively improving the insulation performance between the jumper bar 400 and the upper portion 310 of the fastener. Even when the battery cell 110 experiences thermal runaway, the risk of short circuit and arc discharge between the two can be effectively reduced.

[0064] ​​Meanwhile, the covering body 510 can also provide covering protection for the upper portion 310 of the fastener, which helps to improve the service life of the fastener 300 and ensure that the battery cell assembly can be more reliably fixed at the preset position in the battery pack.

[0065] Figure 3 a schematic view of a third structure of a battery cell assembly is shown, Figure 4 a schematic view of a fourth structure of a battery cell assembly is shown, Figure 3 a first structure of a battery cell assembly is shown.

[0066] As Figure 3 and Figure 4 In some embodiments, the fixing plate 200 is formed with a receiving cavity 230, and the top of the fixing plate 200 is provided with a receiving opening 240 in communication with the receiving cavity 230, and the upper portion 310 of the fastener is adapted to be arranged in the receiving cavity 230 through the receiving opening 240; along the height direction of the fixing plate 200, the gap between the upper portion 310 of the fastener and the jumper tab 400 is configured as an insulating gap.

[0067] In this embodiment, the receiving cavity 230 for accommodating the upper portion 310 of the fastener is arranged on the top of the fixing plate 200, and the upper portion 310 of the fastener enters the receiving cavity 230 from above the fixing plate 200 through the receiving opening 240, and when the connection between the fastener 300 and the box is completed, the upper portion 310 of the fastener remains in the receiving cavity 230 and abuts against the bottom of the receiving cavity 230. At this time, the upper portion 310 of the fastener is located in the fixing plate 200, and the jumper tab 400 is located above the top surface of the fixing plate 200, and the gap between the upper portion 310 of the fastener and the jumper tab 400 can be configured as an insulating gap, thereby improving the insulation performance between the two.

[0068] Meanwhile, since the upper portion 310 of the fastener is located in the fixing plate 200, when the jumper tab 400 is arranged, it is not necessary to consider avoiding the upper portion 310 of the fastener, which helps to reduce the design difficulty and extension length of the jumper tab 400, thereby reducing the manufacturing cost of the jumper tab 400 and making the appearance of the battery cell assembly more simple.

[0069] As Figure 4 In some embodiments, the insulating member includes an insulating high-temperature-resistant layer 520, which is attached to the surface of the fixing plate 200 and located at least between the fixing plate 200 and the jumper tab 400.

[0070] For example, the insulating high-temperature-resistant layer 520 can be an insulating fireproof adhesive tape.

[0071] The applicant finds that, in order to ensure that the fixed plate 200 has high structural strength and low manufacturing cost, the fixed plate 200 can be processed from a metal profile. Since the jumper bar 400 is erected above the fixed plate 200, if the top surface of the metal fixed plate 200 is exposed, there will be a risk of short circuit and arc between the top of the fixed plate 200 and the jumper bar 400 when the battery cell 110 is in thermal runaway.

[0072] To solve the above problems, the embodiment sets an insulating high-temperature-resistant layer 520 between the fixed plate 200 and the jumper bar 400. The exposed surface of the fixed plate 200 is covered by the insulating high-temperature-resistant layer 520, thereby effectively improving the insulation performance between the fixed plate 200 and the jumper bar 400. Even when the battery cell 110 is in thermal runaway, the insulating high-temperature-resistant layer 520 can maintain insulation effect in a high-temperature environment, effectively reducing the risk of short circuit and arc between the fixed plate 200 and the jumper bar 400.

[0073] At the same time, the insulating high-temperature-resistant layer 520 can also cover and protect the fixed plate 200, which helps to improve the service life of the fixed plate 200.

[0074] For example, Figure 3 In some embodiments, the insulating high-temperature-resistant layer 520 includes a top covering part 521 and two side covering parts 522, the top covering part 521 is attached to the top of the fixed plate 200, and the two side covering parts 522 are correspondingly attached to the two side walls of the fixed plate 200 arranged in the first direction, and the top covering part 521 is connected with the two side covering parts 522 respectively.

[0075] For example, the top covering part 521 and the side covering part 522 are integrally formed.

[0076] In combination with the foregoing, the jumper bar 400 is located above the fixed plate 200, so the top covering part 521 is attached to the top of the fixed plate 200, and the insulation between the fixed plate 200 and the jumper bar 400 can be realized through the top covering part 521. Since the fixed plate 200 is connected to the end of the battery pack 100 in the first direction, the side covering part 522 is attached to the side wall of the fixed plate 200 in the first direction, and the insulation between the fixed plate 200 and the battery pack 100, or the insulation between the fixed plate 200 and the external circuit, can be realized through the side covering part 522.

[0077] At the same time, the connection of the top covering part 521 and the side covering part 522 can prevent gaps between the top covering part 521 and the side covering part 522, reduce the exposed surface of the fixed plate 200, and help to further improve the insulation performance of the battery cell assembly and reduce the risk of short circuit and arc between the fixed plate 200 and the jumper bar 400.

[0078] In addition, when the insulating high-temperature-resistant layer 520 is attached to the fixed plate 200, since the top cover portion 521 is connected with the side cover portion 522, as long as one of the two side cover portions 522 and the top cover portion 521 is aligned with the fixed plate 200, the other two can be aligned with the fixed plate 200, which can effectively reduce the assembly difficulty of the battery cell assembly and help improve the assembly efficiency.

[0079] Figure 5 An enlarged schematic view of the second structure in part A is shown. Figure 3

[0080] As shown in FIG. 2, the fixed plate 200 is provided with a plurality of accommodating cavities 230, and each accommodating cavity 230 is provided with an accommodating opening 240. Figure 5 In some embodiments, the top of the fixed plate 200 is provided with an accommodating opening 240, and the top cover portion 521 is provided with an avoiding opening 5211 which avoids the accommodating opening 240.

[0081] For example, the orthographic projection of the avoiding opening 5211 on the top of the fixed plate 200 can coincide with the accommodating opening 240.

[0082] For example, the accommodating opening 240 can be located within the orthographic projection of the avoiding opening 5211 on the top of the fixed plate 200.

[0083] For example, the avoiding opening 5211 extends to the side cover portion 522 along a first direction and extends to the adjacent edge of the top of the fixed plate 200 along a second direction.

[0084] In the present embodiment, in order to facilitate the disassembly of the fastener 300, the avoiding opening 5211 is arranged on the top cover portion 521 to expose the accommodating opening 240. When disassembling the fastener 300, the tool matched with the fastener 300 can directly extend into the accommodating cavity 230 through the exposed accommodating opening 240 and act on the upper portion 310 of the fastener. The other part of the top cover portion 521 except the avoiding opening 5211 can still have an insulating effect on the fixed plate 200 and the jumper plate 400.

[0085] Figure 6 An enlarged schematic view of the third structure in part A is shown. Figure 3

[0086] As shown in FIG. 3, the insulating high-temperature-resistant layer 520 further comprises a folding portion 523, and only one side edge of the folding portion 523 is connected with the side cover portion 522 or the top cover portion 521. Figure 6 In some embodiments, the folding portion 523 has an open state in which only one side edge of the folding portion 523 is connected with the side cover portion 522 or the top cover portion 521, and a connected state in which the folding portion 523 is connected with the top of the fixed plate 200 and covers the accommodating opening 240.

[0087] For example, the folding portion 523 in the connected state can completely cover the avoiding opening 5211.

[0088] ​​Take the connection between the folding part 523 and the side cover part 522 as an example. When the folding part 523 is in the open state, the folding part 523 is away from the top surface of the fixed plate 200, so that the accommodation opening 240 is exposed. Figure 6 .

[0089] Figure 7 A schematic diagram of installing the fastener 300 on the fixed plate 200 is shown. As shown in Figure 7 When the folding part 523 is in the open state, the fastener 300 can be inserted into the accommodation cavity 230 through the exposed accommodation opening 240 until the upper part 310 of the fastener enters the accommodation cavity 230.

[0090] After that, the connection between the fastener 300 and the lower box body of the battery pack is completed, at this time, the upper part 310 of the fastener is fixed in the accommodation cavity 230, and the fixed plate 200 is pressed downward.

[0091] Figure 8 A schematic diagram of switching the folding part 523 to the connected state is shown. As shown in Figure 8 After the connection of the fastener 300 is completed, the folding part 523 can be moved to the avoidance opening 5211 until the folding part 523 is connected with the surface of the fixed plate 200 at the avoidance opening 5211. At this time, the folding part 523 can cover at least the accommodation opening 240, that is, the folding part 523 is above the fastener 300. The folding part 523 can further improve the insulation effect between the upper part 310 of the fastener and the jumper plate 400. At the same time, the folding part 523 can also provide covering protection for the upper part 310 of the fastener in the accommodation cavity 230, which helps to improve the service life of the fastener 300.

[0092] As shown in Figure 1 In some embodiments, the battery cell assembly includes at least two battery groups 100 arranged in a first direction, and the fixed plate 200 includes a middle plate 210 and / or an end plate 220, the middle plate 210 is connected between the adjacent two battery groups 100, and the end plate 220 is connected to the battery cell 110 at the head end or the battery cell 110 at the tail end in the first direction.

[0093] As shown in the structure and direction shown in Figure 1 The middle plate 210 is located between the adjacent two battery groups 100, and the jumper plate 400 erected above the middle plate 210 can realize the electrical connection of the adjacent two battery groups 100. For Figure 1In terms of the structure of two battery packs 100, the cell 110 located at the leftmost side in the first direction can be defined as the cell 110 at the head end, and the cell 110 located at the rightmost side can be defined as the cell 110 at the tail end. One of the two end plates 220 is connected with the cell 110 at the head end, and the other is connected with the cell 110 at the tail end. The cross-bridge 400 (not shown in the figure) erected above the end plate 220 can realize the electrical connection between the battery pack 100 and the external circuit.

[0094] No matter the middle plate 210 or the end plate 220, the insulation performance of the cell assembly can be improved by setting an insulation gap and / or an insulating piece between the upper part 310 of the fastener and the cross-bridge 400, and the phenomenon of short circuit arc in the cell assembly is reduced, thereby effectively improving the safety performance of the cell assembly.

[0095] Based on the same inventive concept, in combination with the description of the cell assembly of each of the above embodiments, the present embodiment provides a battery module, which has the corresponding technical effects of the cell assembly of each of the above embodiments, which will not be described here.

[0096] A battery module comprises the cell assembly of each of the above embodiments.

[0097] Based on the same inventive concept, in combination with the description of the cell assembly of each of the above embodiments, the present embodiment provides a battery pack, which has the corresponding technical effects of the cell assembly of each of the above embodiments, which will not be described here.

[0098] A battery pack comprises the cell assembly of each of the above embodiments.

[0099] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims.

[0100] Each of the embodiments in the present application is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be mutually referred to.

[0101] The description in the present application is given for example and description, and is not exhaustive or limits the present application to the disclosed forms. Many modifications and changes are obvious to those skilled in the art. The embodiments are selected and described in order to better illustrate the principles and practical application of the present application, and to enable those skilled in the art to understand the present application so as to design various embodiments with various modifications suitable for specific purposes.

[0102] Those skilled in the art should understand: the discussion of the above any embodiment is only exemplary, and is not intended to imply that the scope of the application is limited to these examples; in the idea of the present application, the above embodiments or the technical features in different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the embodiments of the present application as described above, which are not provided in details for the sake of brevity.

[0103] Although the present application has been described in conjunction with the specific embodiments thereof, it is to be understood that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description.

[0104] Embodiments of the present application are intended to cover all such alternatives, modifications, and variations which fall within the scope of the present application. Accordingly, any omission, modification, equivalent replacement, improvement, etc. made in the spirit and principle of the embodiments of the present application should be included in the protection scope of the present application.

Claims

1. An electrochemical cell assembly, comprising: The application relates to a battery pack and a battery module. The battery pack comprises at least two battery cells stacked along a first direction, each of the battery cells comprising a battery cell body and a pole, and the pole is connected to the top of the battery cell body. A fixing plate is connected to at least one end of the battery pack along the first direction. A fastener passes through the fixing plate from the top of the fixing plate, and the upper part of the fastener is in abutment with the fixing plate. A jumper bar is arranged above the fixing plate and is electrically connected to the pole, and an insulation gap and / or an insulation member is arranged between the upper part of the fastener and the jumper bar.

2. The cell assembly of claim 1, wherein, The fixing plate is provided with a receiving cavity, and the top of the fixing plate is provided with a receiving opening in communication with the receiving cavity, and the upper part of the fastener is adapted to be arranged in the receiving cavity through the receiving opening; along the height direction of the fixing plate, the gap between the upper part of the fastener and the jumper bar is configured as the insulation gap.

3. The cell assembly of claim 1, wherein, The upper part of the fastener is above the fixing plate and in abutment with the top of the fixing plate; the middle part of the jumper bar is arranged on one side of the upper part of the fastener along a second direction; along the second direction, the gap between the upper part of the fastener and the middle part of the jumper bar is configured as the insulation gap; the second direction, the first direction and the height direction of the fixing plate are perpendicular to each other.

4. The cell assembly of claim 1 or 3, wherein, The insulation member comprises a covering body, and the covering body covers the upper part of the fastener.

5. The cell assembly of claim 1 or 2, wherein, The insulation member comprises an insulation high-temperature-resistant layer, and the insulation high-temperature-resistant layer is attached to the surface of the fixing plate and is arranged between the fixing plate and the jumper bar.

6. The cell assembly of claim 5, wherein, The insulation high-temperature-resistant layer comprises a top covering part and two side covering parts, the top covering part is attached to the top of the fixing plate, and the two side covering parts are correspondingly attached to the two side walls of the fixing plate arranged oppositely along the first direction, and the top covering part is connected to the two side covering parts respectively.

7. The cell assembly of claim 6, wherein, The top of the fixing plate is provided with a receiving opening, and the top covering part is provided with an avoiding opening avoiding the receiving opening.

8. The cell assembly of claim 7, wherein, The insulation high-temperature-resistant layer further comprises a folding part, and only one side edge of the folding part is connected to the side covering part or the top covering part. The folding part has an open state separated from the top of the fixing plate and a connected state connected to the top of the fixing plate and covering the receiving opening.

9. The cell assembly of claim 1, wherein, The battery module comprises at least two battery packs arranged along a first direction, and the fixing plate comprises a middle plate and / or an end plate, the middle plate is connected between two adjacent battery packs, and the end plate is connected to the battery cell at the head end or the battery cell at the tail end along the first direction.

10. A battery module, characterized by The battery module comprises the battery cell assembly according to any one of claims 1 to 9.

11. A battery pack, characterized by, The battery module comprises the battery cell assembly according to any one of claims 1 to 9.

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