Battery pack and energy storage system

Abstract

The utility model provides a battery pack and an energy storage system, and belongs to the technical field of batteries. The battery pack comprises a bottom shell, an upper cover, a battery cell group and an integrated busbar, a containing cavity is defined by the bottom shell and the upper cover. The battery cell group is positioned in the accommodating cavity, and a pole of the battery cell group faces the upper cover. The integrated busbar is arranged between the battery cell group and the upper cover, and the integrated busbar is welded with a pole of the battery cell group. The integrated busbar comprises a plurality of supporting blocks which are used for abutting against the upper cover. In the technical scheme provided by the invention, when the battery pack vibrates and the battery cells of the battery cell group vibrate up and down, the supporting blocks of the integrated busbar can abut against the upper cover, and under the blocking action of the upper cover, the upward deformation quantity of the integrated busbar can be reduced, namely, the pulling of the battery cells to the integrated busbar is reduced, so that the risk of failure of the integrated busbar is reduced.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of batteries, and in particular to a battery pack and an energy storage system. BACKGROUND

[0002] The battery pack includes a cell group and an integrated busbar. The integrated busbar, which can also be referred to as a cell contact system (CCS), is used to connect the cells in the cell group in series and parallel, and to collect information such as the temperature and voltage of each cell for subsequent cell control.

[0003] In a vibration scenario, the cells of the battery pack will pull the integrated busbar due to vibration, causing the integrated busbar to fail. UTILITY MODEL CONTENT

[0004] The present disclosure provides a battery pack and an energy storage system. The integrated busbar of the battery pack includes a plurality of support blocks for abutting against the upper cover. Under the action of the upper cover, the deformation amount of the integrated busbar is reduced, and the reliability of the integrated busbar is improved. The technical solutions of the battery pack and the energy storage system are described below.

[0005] In a first aspect, the present disclosure provides a battery pack. The battery pack includes a bottom shell, an upper cover, a cell group, and an integrated busbar. The bottom shell and the upper cover form an accommodation cavity. The cell group is located in the accommodation cavity, and the pole columns of the cell group face the upper cover. The integrated busbar is arranged between the cell group and the upper cover, and the integrated busbar is welded to the pole columns of the cell group. The integrated busbar includes a plurality of support blocks for abutting against the upper cover.

[0006] The support blocks are made of insulating materials, such as plastic.

[0007] The technical solution provided by the present disclosure is that one side of the integrated busbar is welded to the pole columns of the cell group, and the other side can abut against the upper cover through the plurality of support blocks. In this way, in a vibration scenario of the battery pack, when the cells of the cell group vibrate up and down, the support blocks of the integrated busbar abut against the upper cover, and under the blocking action of the upper cover, the upward deformation amount of the integrated busbar will be smaller, thereby reducing the risk of failure of the integrated busbar.

[0008] In an implementation manner, the cell group includes cells arranged in at least one row, and each row of cells includes pole columns arranged in two rows. The integrated busbar includes at least two conductive rows and a plurality of support blocks. Each conductive row is electrically connected to a row of pole columns, and the conductive row has a gap between the conductive row and the upper cover. Each conductive row includes a plurality of conductive pieces, and each two adjacent conductive pieces have a spacing therebetween. Each support block is located in one spacing.

[0009] The conductive pieces can also be referred to as aluminum bars, and the conductive pieces are used to realize the series connection and / or parallel connection of the cells included in the cell group.

[0010] The technical scheme provided by the present disclosure sets the support block in the interval between the two adjacent conductive sheets, so that the support block does not hinder the function implementation of the existing components in the integrated busbar, and does not increase the area of the integrated busbar.

[0011] In an implementation manner, the support block includes two clamping strips, which are located at one end of the support block away from the upper cover and protrude towards the two conductive sheets on the two sides of the support block respectively. The two clamping strips are clamped between the two conductive sheets and the battery cell group respectively. In this way, the support block and the two conductive sheets on the two sides are fixed together more stably.

[0012] In an implementation manner, the conductive row and the support block are pressed between the hot-pressing upper film and the hot-pressing lower film. The hot-pressing lower film fixes the two clamping strips and the two conductive sheets on the two sides of the support block together respectively.

[0013] In an implementation manner, the clamping strip includes an avoiding slot, and the opening of the avoiding slot faces the pole adjacent to the clamping strip. In this way, the interference between the clamping strip and the pole is avoided.

[0014] In an implementation manner, a part of the pole is located in the avoiding slot. In this way, the interval between the two adjacent poles does not need to be increased due to the introduction of the support block.

[0015] In an implementation manner, the intervals between the plurality of conductive sheets included in each conductive row are arranged in a row, and part of the intervals in each row of intervals has a support block. In this way, the number of support blocks included in the integrated busbar can be avoided to be too large, and the cost and weight of the integrated busbar are reduced.

[0016] In an implementation manner, the two intervals at both ends of each row of intervals respectively have a support block. In this way, the two support blocks in the conductive row abut against the two ends of the upper cover, and the uniformity of the force applied by the upper cover to the integrated busbar is improved.

[0017] In an implementation manner, each row of intervals includes 2N+1 intervals, and the first interval, the N+1 interval and the 2N+1 interval respectively have a support block. Wherein, N is a positive integer greater than or equal to 1. In this way, the plurality of support blocks are more evenly distributed in the integrated busbar, so that the force applied by the upper cover to the integrated busbar is more uniform when the plurality of support blocks abut against the upper cover.

[0018] In an implementation manner, each row of intervals includes 2N+2 intervals, and the first interval and the 2N+2 interval, and one of the N+1 interval or the N+2 interval respectively have a support block. Wherein, N is a positive integer greater than or equal to 1. In this way, the plurality of support blocks are more evenly distributed in the integrated busbar, so that the force applied by the upper cover to the integrated busbar is more uniform when the plurality of support blocks abut against the upper cover.

[0019] In an implementation, the material of the support block is plastic.

[0020] In an implementation, the conductive bar and the support block are fixed together by a hot-pressing film. The support block comprises at least two positioning holes penetrating the support block towards and away from the surface of the upper cover. The positioning holes are used for the positioning column of the hot-pressing equipment to pass through, so as to position the support block during the forming of the integrated busbar, and avoid the movement of the support block.

[0021] In an implementation, the integrated busbar further comprises at least one sampling assembly, each sampling assembly is located between two polar columns included in one row of battery cells and is electrically connected with the two conductive bars. The sampling assembly is a wire harness, a flexible printed circuit assembly (FPCA) or a printed circuit board assembly (PCBA). The sampling assembly is used to collect the temperature and voltage information of each battery cell through the conductive sheet, and send the collected information to the BMS, so as to manage the battery cells by the BMS.

[0022] In an implementation, the battery cells of the battery cell group further comprise a spray valve port located between the two polar columns of the battery cells. The integrated busbar further comprises two groups of supports. The two groups of supports are respectively located at the two ends of each row of battery cells, and the two ends of each sampling assembly are respectively connected with the two groups of supports. The sampling assembly and the spray valve port have a gap therebetween.

[0023] The technical solution provided by the present disclosure is that the sampling assembly and the spray valve port of the battery cell have a gap therebetween, so that the sampling assembly does not block the spray valve port. The sampling assembly and the battery cell group form a channel, which can allow the gas sprayed by the spray valve port to flow, thereby ensuring the pressure relief of the battery cell through the spray valve port. The channel can be referred to as a flue-type channel.

[0024] In an implementation, the conductive sheet comprises a first arching portion arching towards the upper cover, and the sampling assembly is welded to one side of the first arching portion facing the upper cover through an electrical connection sheet. The first arching portion can be stamped and formed.

[0025] The technical solution provided by the present disclosure is that the conductive sheet comprises a first arching portion arching towards the upper cover, so that the first arching portion can be flush or approximately flush with the sampling assembly, thereby facilitating the electrical connection of the two ends of the electrical connection sheet with the first arching portion and the sampling assembly.

[0026] In an implementation, one side of the first arching portion facing the upper cover is a flat surface. The sampling assembly is welded to the flat surface of the first arching portion through an electrical connection sheet. By setting one side of the first arching portion facing the upper cover as a flat surface, and the flat surface is welded with the electrical connection sheet, the reliability of the welding of the electrical connection sheet with the first arching portion is improved.

[0027] In an implementation manner, the at least one conductive sheet further comprises two second arching portions arching towards the upper cover, and the two second arching portions are located on two sides of the first arching portion.

[0028] The technical solution provided by the present disclosure reduces the possibility of fracture of the conductive sheet.

[0029] In an implementation manner, a plurality of groups of openings are formed on the sampling assembly, each group of openings surrounds a region to form a cantilever, and the cantilever is welded with the electrically connecting sheet.

[0030] The technical solution provided by the present disclosure reduces the possibility of fracture of the sampling assembly.

[0031] In a second aspect, the present disclosure provides a power storage system. The power storage system comprises the battery pack and a battery management system (BMS) as described in any one of the first aspect. The BMS is configured to obtain temperature and voltage information of the battery cells through the integrated busbar of the battery pack, and manage the battery pack (e.g., the battery cell group) based on the information. The BMS can be located in the accommodating cavity between the bottom shell and the upper cover, or outside the accommodating cavity. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a schematic diagram of a battery pack in the related art;

[0033] Figure 2 is a schematic diagram of a battery pack provided by an embodiment of the present disclosure;

[0034] Figure 3 is an exploded view of a battery cell group and an integrated busbar provided by an embodiment of the present disclosure;

[0035] Figure 4 is a schematic diagram of a battery cell group and an integrated busbar provided by an embodiment of the present disclosure;

[0036] Figure 5 is a schematic diagram of a conductive sheet and a support block provided by an embodiment of the present disclosure;

[0037] Figure 6 is a schematic diagram of a support block provided by an embodiment of the present disclosure;

[0038] Figure 7is a schematic view of another conductive sheet and support block provided by the embodiments of the present disclosure;

[0039] Figure 8 is a schematic view of the positional relationship of a conductive sheet and a pole provided by the embodiments of the present disclosure;

[0040] Figure 9 is a top view of an integrated busbar provided by the embodiments of the present disclosure;

[0041] Figure 10 is a top view of an integrated busbar with hidden support blocks provided by the embodiments of the present disclosure;

[0042] Figure 11 is a schematic view of the positional relationship of a sampling assembly and a battery cell group provided by the embodiments of the present disclosure;

[0043] Figure 12 is a schematic view of a sampling assembly and a bracket provided by the embodiments of the present disclosure;

[0044] Figure 13 is a partial schematic view of an integrated busbar provided by the embodiments of the present disclosure;

[0045] Figure 14 is a schematic view of a conductive sheet provided by the embodiments of the present disclosure;

[0046] Figure 15 is a schematic view of the connection mode of a sampling assembly and a conductive sheet provided by the embodiments of the present disclosure;

[0047] Figure 16 is another schematic view of the connection mode of a sampling assembly and a conductive sheet provided by the embodiments of the present disclosure.

[0048] Legend

[0049] 1, bottom shell, 10, accommodating cavity;

[0050] 2, upper cover;

[0051] 3, battery cell group, 31, battery cell, 311, pole, 312, spray valve port;

[0052] 4, integrated busbar, 40, spacing, 41, conductive row, 410, conductive sheet, 410a, first conductive sheet, 410b, second conductive sheet, 411, first arch part, 412, second arch part, 42, sampling assembly, 420, opening, 421, electrically connecting sheet, 422, cantilever, 43, support block, 430, avoiding groove, 431, clamping strip, 432, positioning hole, 44, bracket, 45, input and output pole copper row. DETAILED DESCRIPTION

[0053] As Figure 1As shown, the battery pack generally includes a bottom shell 1, an upper cover 2, a cell group 3, and an integrated busbar / CCS 4. The cell group 3 is located in a receiving cavity 10 between the bottom shell 1 and the upper cover 2. The integrated busbar 4 is welded with the pole 311 of the cell group 3. The integrated busbar 4 is used to realize the series and parallel connection of the cells 31 in the cell group 3, and is used to collect the temperature and voltage of each cell 31 and other information, and send the collected information to the BMS. At the same time, the integrated busbar 4 also has the functions of short circuit protection and fault isolation, which plays an important role in ensuring the safety and reliability of the battery pack.

[0054] In the vibration scene of the battery pack, the cells 31 will pull the integrated busbar 4 due to vibration, which is easy to cause the integrated busbar 4 to break and fail.

[0055] In view of the above technical problems, the present embodiment provides a new type of battery pack. As shown in the Figure 2 As shown, the battery pack includes a bottom shell 1, an upper cover 2, a cell group 3, and an integrated busbar 4. The bottom shell 1 and the upper cover 2 form a receiving cavity 10. The cell group 3 is located in the receiving cavity 10, and the pole 311 of the cell group 3 faces the upper cover 2. The integrated busbar 4 is arranged between the cell group 3 and the upper cover 2, and the integrated busbar 4 is welded with the pole 311 of the cell group 3. The integrated busbar 4 includes a plurality of support blocks 43, and the plurality of support blocks 43 are used to abut against the upper cover 2.

[0056] Among them, the battery pack provided by the present embodiment can be an energy storage battery pack, such as a battery pack in a charging pile, a battery pack specially used for storing electric energy. It can also be a power battery pack, such as a battery pack on a vehicle. The integrated busbar 4 includes a plurality of support blocks 43, which can also be understood as the integrated busbar 4 integrated with a plurality of support blocks 43. The plurality of support blocks 43 and other components included in the integrated busbar 4 are fixed. The support block 43 is made of insulating material, for example, plastic.

[0057] The technical scheme provided by the present embodiment is as follows Figure 2 As shown, one side of the integrated busbar 4 is welded with the pole 311 of the cell group 3, and the other side abuts against the upper cover 2 through the support block 43. In this way, in the vibration scene of the battery pack, when the cells 31 of the cell group 3 vibrate up and down, the support block 43 of the integrated busbar 4 will abut against the upper cover 2. Under the blocking action of the upper cover 2, the deformation amount of the integrated busbar 4 upward will be smaller, thereby reducing the risk of failure of the integrated busbar 4.

[0058] It should be noted that the plurality of support blocks 43 can be always in abutting state with the upper cover 2, or the plurality of support blocks 43 can be in abutting state with the upper cover 2 only in the battery pack vibration scene. For example, in the non-vibration working condition, there is a very small gap (such as a gap less than 1mm) between the support block 43 and the upper cover 2, and in the vibration working condition, the cell 31 pulls the integrated busbar 4 so that the support block 43 abuts against the upper cover 2. The advantage of this arrangement is to avoid the support block 43 affecting the normal assembly of the upper cover 2 and the bottom shell 1.

[0059] Next, the implementation of the integrated busbar 4 is exemplarily described.

[0060] As shown in Figure 3 , the cell group 3 includes at least one row of cells 31, and each row of cells 31 includes two rows of pole columns 311. Figure 3 and Figure 4 , the integrated busbar 4 includes at least two conductive rows 41 and a plurality of support blocks 43. Each conductive row 41 is welded with a row of pole columns 311, and the conductive row 41 has a gap with the upper cover 2. Each conductive row 41 includes a plurality of conductive sheets 410, as shown in Figure 5 , each support block 43 is located in a gap 40 between two adjacent conductive sheets 410 and is fixedly connected with the two adjacent conductive sheets 410.

[0061] Among them, the conductive sheet 410 can also be called aluminum bar, and the conductive sheet 410 is used to realize the series and / or parallel connection of the cells 31 included in the cell group 3.

[0062] The technical scheme provided by the embodiments of the present disclosure is that the support block 43 is arranged in the gap 40 between the two adjacent conductive sheets 410, so that the support block 43 does not hinder the function implementation of the existing components (such as the conductive sheet 410 and the sampling assembly 42) in the integrated busbar 4, and does not increase the area of the integrated busbar 4, thereby improving the space utilization of the integrated busbar 4.

[0063] In some examples, as shown in Figure 9 and Figure 10 , the conductive sheet 410 includes two types of conductive sheets, i.e., the first conductive sheet 410a and the second conductive sheet 410b. The pole columns 311 electrically connected with the first conductive sheet 410a are located in the same row. The pole columns 311 connected with the second conductive sheet 410b are located in different rows, and are used to realize the series connection of the cells 31 in different rows. Among them, the second conductive sheet 410b can be considered as being shared by the two conductive rows 41, or it can also be understood that the second conductive sheet 410b includes two parts, and the two parts are located in the two conductive rows 41 respectively. The above-mentioned gap 40 can be located between two first conductive sheets 410a, or can be located between a first conductive sheet 410a and a second conductive sheet 410b. Exemplarily, as shown in Figure 9and Figure 10 As shown in FIG. 4, two intervals 40 are formed between one second conductive sheet 410b and two first conductive sheets 410a.

[0064] In some examples, as shown in FIG. 5, the integrated busbar 4 further comprises at least one sampling assembly 42, each sampling assembly 42 being located between two side poles 311 included in one row of battery cells 31 and being electrically connected to the two side conductive busbars 41. The sampling assembly 42 has a gap with the upper cover 2. Figure 3 and Figure 4 As shown in FIG. 5, the integrated busbar 4 further comprises an input-output pole copper busbar 45, which is electrically connected to the conductive sheet 410 and is used to realize charging and discharging of the battery cell group 3.

[0065] In some examples, the sampling assembly 42 is a wiring harness, a flexible printed circuit assembly (FPCA), or a printed circuit board assembly (PCBA). The sampling assembly 42 is used to collect information such as temperature and voltage of each battery cell 31 through the conductive sheet 410 and send the collected information to the BMS.

[0066] In some examples, as shown in FIG. 5, the integrated busbar 4 further comprises at least one sampling assembly 42, each sampling assembly 42 being located between two side poles 311 included in one row of battery cells 31 and being electrically connected to the two side conductive busbars 41. The sampling assembly 42 has a gap with the upper cover 2. Figure 9 and Figure 10 As shown in FIG. 5, the integrated busbar 4 further comprises an input-output pole copper busbar 45, which is electrically connected to the conductive sheet 410 and is used to realize charging and discharging of the battery cell group 3.

[0067] In some examples, the integrated busbar 4 further comprises a support structure (not shown in the figure). The support structure is used to fix the conductive busbar 41, the sampling assembly 42, and the support block 43 together. In some examples, the support structure is a hot stamping film. For example, the hot stamping film comprises a hot stamping upper film and a hot stamping lower film, and the conductive busbar 41, the sampling assembly 42, and the support block 43 are tightly pressed between the hot stamping upper film and the hot stamping lower film. Correspondingly, as shown in FIG. 6, the support block 43 comprises at least two positioning holes 432, which penetrate the support block 43 towards and away from the face of the upper cover 2, and the positioning holes 432 are used for the positioning column of the hot stamping equipment to pass through, so as to facilitate the hot stamping equipment to position the support block 43 when hot stamping and fixing the integrated busbar 4. Figure 6

[0068] In other examples, the support structure is an injection molded bracket or a vacuum formed bracket.

[0069] Next, the fixing method of the support block 43 and the adjacent two conductive sheets 410 is exemplarily described.

[0070] In some examples, as shown in FIG. 5, the integrated busbar 4 further comprises at least one sampling assembly 42, each sampling assembly 42 being located between two side poles 311 included in one row of battery cells 31 and being electrically connected to the two side conductive busbars 41. The sampling assembly 42 has a gap with the upper cover 2. Figure 6 and Figure 7 ​As shown, the support block 43 includes two clamping strips 431. The two clamping strips 431 are located at the end of the support block 43 away from the upper cover 2, and protrude towards the two conductive sheets 410 on both sides of the support block 43 respectively. The two clamping strips 431 are located between the two conductive sheets 410 and the battery cell group 3 respectively. In this way, the support block 43 is clamped with the two conductive sheets 410 through the two clamping strips 431.

[0071] For the case where the support structure is a hot-pressed film, the hot-pressed film covers the side of the two clamping strips 431 and the two conductive sheets 410 facing the battery cell group 3, so as to achieve the fixed connection of the support block 43 and the two conductive sheets 410.

[0072] In some examples, as shown in Figure 6 and Figure 8 The clamping strip 431 includes an avoidance groove 430. As shown in Figure 8 The opening of the avoidance groove 430 faces the pole 311 adjacent to the clamping strip 431. Since the clamping strip 431 invades the bottom side of the conductive sheet 410, there is a risk of interference between the clamping strip 431 and the pole 311. By providing the avoidance groove 430, the clamping strip 431 avoids the pole 311.

[0073] In some examples, as shown in Figure 8 A part of the pole 311 is located in the avoidance groove 430.

[0074] Next, the number and arrangement of the support blocks 43 are exemplarily described. As shown in Figure 9 and Figure 10 The intervals 40 between the plurality of conductive sheets 410 included in each conductive row 41 are arranged in a row.

[0075] In some examples, all intervals 40 in each row of intervals 40 have a support block 43.

[0076] In other examples, as shown in Figure 9 and Figure 10 Some intervals 40 in each row of intervals 40 have a support block 43. In this way, the number of support blocks 43 can be reduced, and the weight and cost of the integrated busbar 4 can be reduced. Among them, Figure 10 The support block 43 is hidden in the middle.

[0077] In some examples, as shown in Figure 9 and Figure 10 Two intervals 40 at both ends of each row of intervals 40 have a support block 43 respectively. In this way, the two support blocks 43 in each conductive row 41 support the two ends of the upper cover 2 respectively, which improves the reliability of the support block 43 supporting the upper cover 2.

[0078] To further improve the supporting effect of the support block 43 on the upper cover 2, in some examples, one support block 43 is also arranged in a certain interval 40 in the middle of each row of intervals 40. In this way, for three support blocks 43 in each conductive row 41, two of the support blocks 43 abut against two ends of the upper cover 2, and the other support block 43 abuts against the middle part of the upper cover 2. The upper cover 2 exerts a more uniform force on the integrated busbar 4 through the three support blocks 43, and the number of support blocks 43 is not excessive, thereby reducing the weight and cost of the integrated busbar 4.

[0079] In some examples, as shown in Figure 9 and Figure 10 each row of intervals 40 includes 2N+2 intervals 40, the first interval 40 and the 2N+2th interval 40, and one of the N+1th interval 40 or the N+2th interval 40 each has one support block 43. Wherein, N is a positive integer greater than or equal to 1.

[0080] For example, as shown in Figure 9 each row of intervals 40 includes 6 (N equals 2) intervals 40, then the first interval 40, the fourth interval 40 and the sixth interval 40 are provided with support blocks 43 from top to bottom, and the fourth interval 40 is the above-mentioned certain interval 40 in the middle. If counted from bottom to top, the first interval 40, the third interval 40 and the sixth interval 40 are provided with support blocks 43, and the third interval 40 is the above-mentioned certain interval 40 in the middle.

[0081] In some examples, for the case that each row of intervals 40 includes an odd number of intervals 40, that is, each row of intervals 40 includes 2N+1 intervals 40, the first interval 40, the N+1th interval 40 and the 2N+1th interval 40 each have one support block 43. Wherein, the N+1th interval 40 is the above-mentioned certain interval 40 in the middle.

[0082] It should be noted that, Figure 9 the integrated busbar 4 shown in the figure is provided with at least one support block 43 in each row of intervals 40. In other examples, a support block 43 can also be arranged in a certain row of intervals 40. For example, support blocks 43 are arranged in two rows of intervals 40 on both sides, and no support block 43 is arranged in other rows of intervals 40. Or, support blocks 43 are arranged in two rows of intervals 40 on both sides and one row of intervals 40 in the middle, and no support block 43 is arranged in other rows of intervals 40.

[0083] In addition, the number of support blocks 43 arranged in each row of intervals 40 can be the same or different, and the embodiments of the present disclosure do not limit this.

[0084] A vent port 312 is provided between the two poles 311 of the general battery cell 31 for internal pressure relief of the battery cell 31, and the vent port 312 is opposite to the sampling assembly 42. In order to avoid the sampling assembly 42 blocking the internal pressure relief of the battery cell 31, in some examples, as shown in Figure 11 and Figure 12 The integrated busbar 4 also includes two groups of supports 44, which are respectively located at the two ends of each row of battery cells 31. The two ends of each sampling assembly 42 are connected with the two groups of supports 44, and the sampling assembly 42 has a gap with the vent port 312, as shown in Figure 11 The sampling assembly 42 and the battery cell 31 form a channel, which can flow the gas discharged from the battery cell 31, and the channel can be called a flue channel. Each group of supports 44 includes at least one support 44.

[0085] In some examples, as shown in Figure 12 The support 44 is three. One of the supports 44 supports one end of the sampling assembly 42, and the other two supports 44 support the other end of the sampling assembly 42.

[0086] In some examples, as shown in Figure 13 and Figure 14 The conductive sheet 410 includes a first arch 411 arching towards the upper cover 2. One end of the electrically connecting sheet 421 is connected with one side of the first arch 411 facing the upper cover 2, and the other end is electrically connected with the sampling assembly 42. The first arch 411 can be stamped. The electrically connecting sheet 421 can be a nickel sheet. The first arch 411 raises the height of the conductive sheet 410, and the first arch 411 is flush or approximately flush with the sampling assembly 42. Thus, the two ends of the electrically connecting sheet 421 are respectively welded with the sampling assembly 42 and the first arch 411.

[0087] In some examples, as shown in Figure 13 and Figure 14 One side of the first arch 411 facing the upper cover 2 is a plane, so as to facilitate the welding of the first arch 411 and the electrically connecting sheet 421.

[0088] In addition, the battery cell 31 will swell and deform during charging and discharging, and the deformation direction is generally the arrangement direction of the battery cell row. In the long-term application scenario, the swelling and deformation can easily cause the integrated busbar 4 to be pulled and stressed, and then the conductive sheet 410 or the sampling assembly 42 is broken.

[0089] In order to solve the technical problem of the breakage of the conductive sheet 410, in some examples, as shown in Figure 14As shown, the conductive sheet 410 further comprises a second arch portion 412, which arches towards the upper cover 2. In this way, when the conductive sheet 410 is subjected to a pulling force, the second arch portion 412 will be stretched, thereby reducing the possibility of the conductive sheet 410 breaking. It should be noted that the first arch portion 411 described above can also be stretched when the conductive sheet 410 is subjected to a pulling force, and can also play a role in reducing the possibility of the conductive sheet 410 breaking.

[0090] It should be noted that not all conductive sheets 410 need to be provided with a second arch portion 412. For example, as shown in FIG. 6, for some shorter conductive sheets 410 (such as the conductive sheets 410 located at the edges), only the first arch portion 411 is provided. Figure 10

[0091] In some examples, as shown in FIG. 7, the second arch portion 412 is provided with a convex arc surface facing the upper cover 2. In this way, the second arch portion 412 has a greater length of stretching. Figure 14

[0092] In some examples, as shown in FIG. 8, the conductive sheet 410 comprises two second arch portions 412, which are located on both sides of the first arch portion 411. Figure 14

[0093] In order to solve the technical problem of the sampling assembly 42 breaking, in some examples, as shown in FIG. 9 and FIG. 10, the sampling assembly 42 comprises a cantilever 422, which is welded with the electrical connection sheet 421. In this way, when the sampling assembly 42 is subjected to a pulling force, the cantilever 422 can adaptively deform and displace, so as to reduce the possibility of the sampling assembly 42 breaking or the electrical connection sheet 421 breaking. Figure 15 Figure 16 In some examples, as shown in FIG. 11, the sampling assembly 42 is provided with a plurality of groups of openings 420, and each group of openings 420 forms a cantilever 422 around the area surrounded by the group of openings 420. Among them, the openings 420 are arranged such that the cantilever 422 is separated from the main body, and then the cantilever 422 has a strong deformation and displacement capability.

[0094] In some examples, as shown in FIG. 11, the sampling assembly 42 is provided with a plurality of groups of openings 420, and each group of openings 420 forms a cantilever 422 around the area surrounded by the group of openings 420. Among them, the openings 420 are arranged such that the cantilever 422 is separated from the main body, and then the cantilever 422 has a strong deformation and displacement capability. Figure 16

[0095] The embodiments of the present disclosure further provide a storage energy system. The storage energy system comprises the battery pack and a battery management system (BMS). The BMS is electrically connected with the integrated busbar 4 of the battery pack, for example, is electrically connected with the sampling assembly 42 of the integrated busbar 4. In this way, the BMS can collect the temperature and voltage information of the battery cell 31 through the integrated busbar 4, and manage the battery pack based on the information. The storage energy system can also be referred to as a storage energy box. The BMS can be located in the containing cavity 10 between the bottom shell 1 and the upper cover 2, or can be located outside the containing cavity 10.​​​​​

[0096] The terms used in the embodiments of the present disclosure are only for explaining the embodiments of the present disclosure, and are not intended to limit the present disclosure. Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should be understood as the general meaning thereof understood by those having ordinary knowledge in the art to which the present disclosure belongs. The above-described only the optional embodiments of the present disclosure, and is not intended to limit the present disclosure, any modification, equivalent replacement, improvement, etc. made within the principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A battery pack, characterized by, The battery pack comprises a bottom shell (1), an upper cover (2), a battery cell group (3) and an integrated busbar (4); The bottom shell (1) and the upper cover (2) surround to form a containing cavity (10); The battery cell group (3) is located in the containing cavity (10), and the pole column (311) of the battery cell group (3) faces the upper cover (2); The integrated busbar (4) is arranged between the battery cell group (3) and the upper cover (2), the integrated busbar (4) is welded with the pole column (311) of the battery cell group (3), and the integrated busbar (4) comprises a plurality of supporting blocks (43), and the plurality of supporting blocks (43) are used for abutting against the upper cover (2).

2. The battery pack of claim 1, wherein, The battery cell group (3) comprises battery cells (31) arranged in at least one row, and the pole column (311) of each row of battery cells (31) is arranged in two rows; The integrated busbar (4) comprises two conductive rows (41), each conductive row (41) is welded with a row of pole columns (311), and the conductive row (41) has a gap between the conductive row (41) and the upper cover (2); Each conductive row (41) comprises a plurality of conductive sheets (410), and each conductive sheet (410) has a gap (40) between adjacent two conductive sheets (410), and each supporting block (43) is located in one gap (40).

3. The battery pack of claim 2, wherein, The supporting block (43) comprises two clamping strips (431), the two clamping strips (431) are located at one end of the supporting block (43) away from the upper cover (2) and protrude towards two conductive sheets (410) on both sides of the supporting block (43) respectively; The two clamping strips (431) are clamped between the two conductive sheets (410) and the battery cell group (3) respectively.

4. The battery pack of claim 3, wherein, The clamping strip (431) comprises an avoiding groove (430), and the opening of the avoiding groove (430) faces the pole column (311) adjacent to the clamping strip (431).

5. The battery pack of claim 4, wherein, Part of the pole column (311) is located in the avoiding groove (430).

6. The battery pack of any one of claims 2-5, wherein, The gaps (40) between the plurality of conductive sheets (410) of each conductive row (41) are arranged in one row, and part of the gaps (40) in each row of gaps (40) has the supporting block (43).

7. The battery pack of claim 6, wherein, Two gaps (40) at both ends in each row of gaps (40) have a supporting block (43) respectively.

8. The battery pack of claim 7, wherein, Each row of gaps (40) comprises 2N+1 gaps (40), the first gap (40), the N+1th gap (40) and the 2N+1th gap (40) have a supporting block (43) respectively; or, Each row of gaps (40) comprises 2N+2 gaps (40), the first gap (40) and the 2N+2th gap (40), and the N+1th gap (40) or the N+2th gap (40) have a supporting block (43) respectively; Wherein, N is a positive integer greater than or equal to 1.

9. The battery pack of any one of claims 2-5, wherein, The material of the supporting block (43) is plastic.

10. The battery pack of any one of claims 2-5, wherein, The supporting block (43) comprises at least two positioning holes (432), and the positioning holes (432) penetrate the supporting block (43) towards and away from the upper cover (2).

11. The battery pack of any one of claims 2-5, wherein, The integrated busbar (4) further comprises at least one sampling assembly (42), each of the sampling assemblies (42) is located between two polar posts (311) included in one row of the battery cells (31) and is electrically connected with the two-side conductive busbars (41).

12. The battery pack of claim 11, wherein, Each of the battery cells (31) further comprises a spray valve port (312) located between the two polar posts (311) of the battery cell (31). The integrated busbar (4) further comprises two groups of supports (44) respectively located at two ends of each row of the battery cells (31), and two ends of each of the sampling assemblies (42) are connected with the two groups of supports (44), and the sampling assembly (42) has a gap between the spray valve port (312).

13. The battery pack of claim 12, wherein, The conductive sheet (410) comprises a first arch portion (411) arching towards the upper cover (2), and the sampling assembly (42) is welded to one side of the first arch portion (411) facing the upper cover (2) through an electrically connecting sheet (421).

14. The battery pack of claim 13, wherein, At least one of the conductive sheets (410) further comprises two second arch portions (412) arching towards the upper cover (2), and the two second arch portions (412) are located at two sides of the first arch portion (411).

15. The battery pack of claim 13, wherein, A plurality of groups of openings (420) are formed on the sampling assembly (42), and each group of the openings (420) surrounds an area forming a cantilever (422), and the cantilever (422) is welded to the electrically connecting sheet (421).

16. An energy storage system characterized by, The energy storage system comprises the battery pack and the battery management system according to any one of claims 1-15, the battery management system is used to acquire information of the battery cell group (3) through the integrated busbar (4) and manage the battery cell group (3) based on the information.

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