Battery pack

Abstract

The utility model provides a kind of battery pack, including at least two electric core modules and two sampling assemblies, at least two electric core modules are arranged in two columns along the first direction, and exhaust passage is formed between two columns of electric core modules;Each electric core module includes multiple electric core monomers stacked along the second direction, the side of each electric core monomer away from exhaust passage is provided with positive pole column and negative pole column, and the electric core monomer in the same column is mutually connected in series by first conductive connecting piece, and the first direction and the second direction are perpendicular to each other;Two sampling assemblies are respectively arranged on the side of two columns of electric core modules away from exhaust passage, and each electric core monomer in corresponding column is electrically connected by sampling line respectively in each sampling assembly, and each sampling assembly is provided with a sampling interface, and the collection of preset signal of electric core monomer in corresponding column is realized by sampling interface.The battery pack of the utility model only needs to set 2 sampling assemblies to complete the collection of preset signal of electric core monomer, and cost can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to a battery pack. Background Technology

[0002] Currently, the short-blade cell battery packs widely used in the energy storage field typically employ a two-row layout design, with cells achieving high energy density and adaptability through end posts on both sides. However, to accurately collect critical data such as cell voltage and temperature to ensure the safe and stable operation of the battery pack, existing short-blade cell battery packs with end posts on both sides require four sampling CCSs (Cells Contact Systems). The sampling CCSs play a crucial role in data acquisition and transmission within the battery pack, enabling real-time acquisition of cell operating status information through their connection with the cells. However, the use of four sampling CCSs inevitably increases the cost of the battery pack, including material costs, manufacturing process costs, and installation and commissioning costs. In today's increasingly competitive market, the higher cost makes the product less price-competitive, limiting its market promotion and application.

[0003] Therefore, while ensuring that the battery pack can accurately collect cell data and effectively achieve thermal isolation to ensure safety, how to reduce the cost of the battery pack has become a key issue that urgently needs to be addressed in the current field of energy storage short-blade cell battery pack technology. Utility Model Content

[0004] This invention provides a battery pack that addresses the problem of high cost in existing battery packs.

[0005] This utility model provides a battery pack, comprising: At least two battery cell modules are arranged in two columns along a first direction, and an exhaust channel is formed between the two columns of battery cell modules; each battery cell module includes multiple battery cell units stacked along a second direction, each battery cell unit has a positive terminal and a negative terminal on the side away from the exhaust channel, and the battery cell units in the same column are connected in series with each other through a first conductive connector, wherein the first direction and the second direction are perpendicular to each other; Two sampling assemblies are respectively located on the side of the two columns of battery cell modules away from the exhaust channel. Each sampling assembly is electrically connected to each battery cell in the corresponding column through a sampling line. Each sampling assembly is provided with a sampling interface, through which the preset signal of the battery cell in the corresponding column is collected.

[0006] Optionally, the battery pack also includes an electrical box located on one side of the cell module along the second direction. The electrical box contains a data acquisition slave board and a transfer cable bundle. The data acquisition slave board is electrically connected to two of the sampling assemblies via the transfer cable bundle. The transfer cable bundle is used to transfer the preset signal acquired by the sampling assembly to the data acquisition slave board.

[0007] Optionally, the battery pack also includes a cold plate tray, a bracket, a crossbeam, and a side beam. The cell module is placed on the cold plate tray. The electrical box and the side beam are arranged opposite to each other at both ends of the cold plate tray along a second direction. The electrical box and the side beam are also connected by two brackets arranged along the second direction. The crossbeam is arranged along a first direction and its two ends are respectively connected to the two brackets. The two adjacent cell modules in the second direction are separated by the crossbeam, and the cold plate tray, the electrical box, the bracket, the crossbeam and the side beam enclose and form a fixed frame assembly for the cell module.

[0008] Optionally, two adjacent battery cells in the same battery cell module along the second direction are bonded together by a sealing aerogel pad. The area of ​​the sealing aerogel pad is the same as the area of ​​the bonding surface of the battery cell. The sealing aerogel pad is used to achieve sealing between the two adjacent battery cells in the first direction.

[0009] Optionally, the sealing aerogel pad includes an aerogel pad and a first sealant layer located on opposite sides of the aerogel pad, the first sealant layer corresponding to opposite sides of the aerogel pad in a first direction.

[0010] Optionally, a sealing filling layer is provided in the gap between the end face of the battery module in the second direction and the adjacent crossbeam, side beam or electrical box sidewall; The battery pack also includes an intermediate sealing plate, which is disposed opposite to the cold plate tray and is bonded to the shoulder of the cell module on the side away from the cold plate tray, corresponding to the exhaust channel. The orthographic projection of the intermediate sealing plate on the cold plate tray covers the orthographic projection of the exhaust channel on the cold plate tray.

[0011] Optionally, the two brackets are respectively bonded to the shoulder of the two rows of battery cell modules on the side away from the exhaust channel; The battery pack also includes a side sealing plate, the four edges of which are respectively bonded to the side beam, the cold plate tray, the bracket and the electrical box. The side sealing plate forms an electrical connection sealing cavity by cooperating with the side beam, the cold plate tray, the bracket and the electrical box.

[0012] Optionally, a second sealant layer is provided at the positions where the bracket overlaps with the side beam and the electrical box, respectively.

[0013] Optionally, the inner side of the side beam is provided with a clearance groove extending along the first direction, and a second conductive connector is provided in the clearance groove, and the two rows of battery cell modules are connected in series through the second conductive connector.

[0014] Optionally, each of the battery cells is provided with a cell explosion-proof valve on the side near the exhaust channel, and a battery explosion-proof valve is provided on the electrical box at the position corresponding to the exhaust channel.

[0015] The above-mentioned technical solution of this utility model has the following beneficial effects: This utility model's battery pack, by placing the positive and negative terminals of each individual cell in the cell module on the side away from the exhaust channel, allows cells in the same row to be connected in series on the same side. Two sampling assemblies are respectively placed on the side of the two rows of cell modules away from the exhaust channel, and each sampling assembly is electrically connected to each cell in the corresponding row via a sampling line. Each sampling assembly has a sampling interface, through which the preset signals of the cells in the corresponding row can be collected. Compared with the traditional scheme of placing terminals on both sides of the cell and sampling through 4 sampling CCSs, this utility model only needs to set up 2 sampling assemblies to complete the collection of preset signals of the cells in the battery pack, reducing sampling and electrical connection costs. Moreover, the sampling and electrical connection areas (i.e., the electrical connection areas between the sampling assembly and the cell, and between cells in the same row) face the outside of the cell module, facilitating later maintenance and fault detection. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 One of the partial structural schematic diagrams of the battery pack provided in the embodiment of this utility model; Figure 2 This is a schematic diagram of the terminal side of a battery cell provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the explosion-proof valve side of a battery cell provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the sealing aerogel pad provided in an embodiment of the present invention; Figure 5A schematic diagram of the exhaust channel and electrical connection sealing cavity of the battery pack provided in an embodiment of this utility model; Figure 6 This is a schematic diagram of the battery pack provided in an embodiment of the present utility model; Figure 7 This is an exploded view of the battery pack structure provided in an embodiment of the present invention; Figure 8 A partial structural schematic diagram of the electrical box provided in an embodiment of this utility model; Figure 9 A side view of the battery pack provided in this embodiment of the present invention when the side sealing plate is not installed; Figure 10 A side view of the battery pack after the side sealing plate is installed, provided for an embodiment of this utility model; Figure 11 for Figure 1 The image shows a magnified view of a portion of region A.

[0018] Figure label: 1. Battery cell module; 2. Sampling assembly; 3. Exhaust channel; 4. First conductive connector; 5. Electrical box; 6. Cold plate tray; 7. Bracket; 8. Crossbeam; 9. Side beam; 10. Intermediate sealing plate; 11. Side sealing plate; 12. Second conductive connector; 13. Maintenance cover plate; 14. Electrical connection sealing cavity; 101. Battery cell; 102. Sealing aerogel pad; 1011. Positive electrode post; 1012. Negative electrode post; 1013. Battery cell explosion-proof valve; 103. Directional explosion-proof isolation plate; 111. Sealing strip; 201. Sampling interface; 501. High-voltage interface; 502. Low-voltage communication interface; 503. Cold plate liquid inlet / outlet interface; 504. Battery explosion-proof valve; 505. Data acquisition board; 506. Wiring harness through hole; 507. Fuse; 901. Clearance groove; 100. Overlap position; 200. Welding position. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] Please see Figures 1-3 , Figure 7 as well as Figure 9This utility model provides a battery pack, including at least two cell modules 1 and two sampling assemblies 2. The sampling assembly 2 (also known as the acquisition integration component or CCS assembly) is a key component of the battery management system (BMS), responsible for collecting the core parameters of the battery in real time and transmitting the data to the BMS for monitoring and protection.

[0021] In this configuration, at least two battery cell modules 1 are arranged in two columns along a first direction, and an exhaust channel 3 is formed between the two columns of battery cell modules 1. Each battery cell module 1 includes multiple battery cell units 101 stacked along a second direction. Each battery cell unit 101 has a positive terminal post 1011 and a negative terminal post 1012 on the side away from the exhaust channel 3, and a battery cell explosion-proof valve 1013 on the side of each battery cell unit 101 close to the exhaust channel 3. The battery cell units 101 in the same column are connected in series with each other through a first conductive connector 4. The first direction (such as the width direction of the battery pack) and the second direction (such as the length direction of the battery pack) are perpendicular to each other.

[0022] Two sampling assemblies 2 are respectively located on the side of the two rows of battery cell modules 1 away from the exhaust channel 3. Each sampling assembly 2 is electrically connected to each individual battery cell 101 in the corresponding row via a sampling line (not shown). Each sampling assembly 2 is provided with a sampling interface 201, through which preset signals of the individual battery cell 101 in the corresponding row can be acquired. The preset signals can be the voltage signal and temperature signal of the individual battery cell 101.

[0023] Since the positive terminal 1011 and negative terminal 1012 of the battery cell 101 are both located on the side of the battery cell 101 away from the exhaust channel 3, the battery cells 101 in the same row can be connected in series on the same side. Therefore, only two sampling assemblies 2 need to be electrically connected to each battery cell 101 in the corresponding row at the series connection point to realize the acquisition of voltage and temperature signals of the battery cells 101 in the corresponding row, which reduces the sampling and electrical connection cost. Moreover, the sampling and electrical connection area (i.e. the electrical connection area between the sampling assembly 2 and the battery cell 101, and between the battery cells 101 in the same row) faces the outside of the battery cell module 1, which facilitates later maintenance and fault detection.

[0024] See Figure 1 , Figure 4 and Figure 5 Two adjacent battery cells 101 in the same battery cell module 1 along the second direction are bonded together by a sealing aerogel pad 102. The area of ​​the sealing aerogel pad 102 is the same as the area of ​​the bonding surface of the battery cell 101. The sealing aerogel pad 102 is used to achieve sealing of the two adjacent battery cells 101 in the first direction, that is, to isolate the middle exhaust channel 3 from the electrical connection sealing cavities 14 on both sides.

[0025] Furthermore, the sealing aerogel pad 102 includes an aerogel pad 1021 and a first sealing layer 1022 located on opposite sides of the aerogel pad 1021. The first sealing layer 1022 corresponds to the opposite sides of the aerogel pad 1021 in the first direction to ensure the airtightness between two adjacent battery cells 101 in the first direction and prevent the high-temperature gas from the exhaust channel 3 from entering the electrical connection sealing cavity 14 on the left and right sides.

[0026] To prevent high-temperature gas or ejected material from damaging other battery cells 101 after a single cell explosion-proof valve 1013 is opened, a directional explosion-proof isolation plate 103 needs to be attached to the bottom of the battery cell 101 on the side with the cell explosion-proof valve 1013. This isolation plate is usually made of mica board. Through design such as serration, the elongated oval plate on the thermal runaway cell explosion-proof valve, which is designed to conform to the shape of the explosion-proof valve, will be ejected when thermal runaway occurs, preventing damage to other cell explosion-proof valves 1013 and covers on the exhaust channel 3.

[0027] See Figures 6-9 This embodiment uses a battery pack with two rows and two columns of cell modules as an example for illustration. The battery pack also includes an electrical box 5, a cold plate tray 6, a bracket 7, a crossbeam 8, and a side beam 9. The cell module 1 is placed on the cold plate tray 6 and fixed to the cold plate tray 6 by thermally conductive structural adhesive. The electrical box 5 and the side beam 9 are arranged opposite each other at both ends of the cold plate tray 6 along the second direction, and the electrical box 5 and the side beam 9 are also connected by two brackets 7 arranged along the second direction. The crossbeam 8 is arranged along the first direction and its two ends are respectively connected to the two brackets 7. Two adjacent cell modules 1 in the second direction are separated by the crossbeam 8. The cold plate tray 6, electrical box 5, bracket 7, crossbeam 8, and side beam 9 together form a fixed frame assembly for the cell module 1.

[0028] The electrical box 5 includes a high-voltage interface 501, a low-voltage communication interface 502, a cold plate inlet / outlet interface 503, and a battery explosion-proof valve 504. The battery explosion-proof valve 504 corresponds to and is connected to the exhaust channel 3. The electrical box 5 also contains a data acquisition slave board 505, a fuse 507, and a transfer harness (not shown). The data acquisition slave board 505 is electrically connected to two sampling assemblies 2 via the transfer harness. The transfer harness is used to transfer the cell voltage and temperature signals acquired by the sampling assemblies 2 to the data acquisition slave board 505. The connectors of the transfer harness are inserted into the sampling interface 201 of the sampling assembly 2 through through holes 506 on both sides of the electrical box 5.

[0029] The crossbeam 8 is provided with an exhaust groove (not shown) at the position corresponding to the exhaust channel 3, so that the front and rear exhaust channels 3 are connected in the second direction, and the exhaust groove is isolated and sealed from the internal cavity of the crossbeam 8 to prevent the high temperature gas of the exhaust channel 3 from entering the electrical connection sealing cavity on the left and right sides.

[0030] After the battery cell module 1 is placed into the enclosure, a sealing filling layer is provided in the gap between the end face of the battery cell module 1 in the second direction and the adjacent crossbeam 8, side beam 9, or side wall of the electrical box 5. This sealing filling layer can be compressed vacuum foam. After the vacuum is broken, the vacuum foam expands and thickens, which can completely fill and seal the gap.

[0031] Continue reading Figure 5 and Figure 6 The battery pack also includes an intermediate sealing plate 10, which is disposed opposite to the cold plate tray 6 and is attached to the shoulder of the cell module 1 on the side away from the cold plate tray 6, corresponding to the exhaust channel 3. The orthogonal projection of the intermediate sealing plate 10 on the cold plate tray 6 covers the orthogonal projection of the exhaust channel 3 on the cold plate tray 6, so that the intermediate sealing plate 10 can completely cover the exhaust channel 3 to ensure the sealing of the exhaust channel 3.

[0032] Both brackets 7 are L-shaped brackets, which are respectively bonded to the shoulder of the two rows of battery cell modules 1 on the side away from the exhaust channel 3 by structural adhesive, and then locked to the electrical box 5, the crossbeam 8 and the side beam 9 by bolts.

[0033] Furthermore, the battery pack also includes a maintenance cover 13, which covers the opening of the electrical box 5.

[0034] See Figure 6 , Figure 7 , Figure 9 and Figure 10 The battery pack also includes a side sealing plate 11, the four edges of which are respectively bonded to the side beam 9, the cold plate tray 6, the bracket 7, and the electrical box 5. The side sealing plate 11, in cooperation with the side beam 9, the cold plate tray 6, the bracket 7, and the electrical box 5, forms an electrical connection sealing cavity 14. The four edges of the side sealing plate 11 are provided with sealing strips 111 to enhance sealing performance.

[0035] Among them, the inner side of the side beam 9 is provided with a relief groove 901 extending along the first direction, and a second conductive connector 12 (such as a long copper busbar) is provided in the relief groove 901. The two battery cell modules 1 are connected in series through the second conductive connector 12.

[0036] Furthermore, such as Figure 11 As shown, to improve the sealing performance of the electrical connection cavity, a second sealing layer is provided at the overlap position 100 between the bracket 7 and the side beam 9 and the electrical box 5, respectively. The flange of the cold plate tray 6 is welded to the electrical box 5 at the welding position 200 for sealing.

[0037] This utility model's battery pack adopts a thermoelectric separation design, ensuring high safety. Furthermore, only two sampling assemblies are needed to collect preset signals from individual battery cells, reducing sampling and electrical connection costs. The sampling and electrical connection areas face outwards, facilitating after-sales maintenance and fault detection. The electrical connection and venting sealing design is simple; compared to conventional large-size integrated battery pack sealing cover solutions, it eliminates the need for a cover mold, provides comparable sealing and protection performance, uses less material, and reduces costs by more than 50%.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery pack, characterized in that, include: At least two battery cell modules are arranged in two columns along a first direction, and an exhaust channel is formed between the two columns of battery cell modules; each battery cell module includes multiple battery cell units stacked along a second direction, each battery cell unit has a positive terminal and a negative terminal on the side away from the exhaust channel, and the battery cell units in the same column are connected in series with each other through a first conductive connector, wherein the first direction and the second direction are perpendicular to each other; Two sampling assemblies are respectively located on the side of the two columns of battery cell modules away from the exhaust channel. Each sampling assembly is electrically connected to each battery cell in the corresponding column through a sampling line. Each sampling assembly is provided with a sampling interface, through which the preset signal of the battery cell in the corresponding column is collected.

2. The battery pack according to claim 1, characterized in that, It also includes an electrical box located on one side of the battery cell module along the second direction. The electrical box contains a data acquisition slave board and a transfer cable bundle. The data acquisition slave board is electrically connected to two of the sampling assemblies through the transfer cable bundle. The transfer cable bundle is used to transfer the preset signal acquired by the sampling assembly to the data acquisition slave board.

3. The battery pack according to claim 2, characterized in that, It also includes a cold plate tray, a bracket, a crossbeam, and a side beam. The battery cell module is placed on the cold plate tray. The electrical box and the side beam are arranged opposite to each other at both ends of the cold plate tray along a second direction. The electrical box and the side beam are also connected by two brackets arranged along the second direction. The crossbeam is arranged along a first direction and its two ends are respectively connected to the two brackets. The two adjacent cell modules in the second direction are separated by the crossbeam, and the cold plate tray, the electrical box, the bracket, the crossbeam and the side beam enclose and form a fixed frame assembly for the cell module.

4. The battery pack according to claim 3, characterized in that, Two adjacent battery cells in the same battery cell module are bonded together in the second direction by a sealing aerogel pad. The area of ​​the sealing aerogel pad is the same as the area of ​​the bonding surface of the battery cell. The sealing aerogel pad is used to achieve sealing between the two adjacent battery cells in the first direction.

5. The battery pack according to claim 4, characterized in that, The sealing aerogel pad includes an aerogel pad and a first sealant layer located on opposite sides of the aerogel pad, the first sealant layer corresponding to opposite sides of the aerogel pad in a first direction.

6. The battery pack according to claim 4, characterized in that, A sealing filling layer is provided in the gap between the end face of the battery module in the second direction and the adjacent crossbeam, side beam or electrical box sidewall; The battery pack also includes an intermediate sealing plate, which is disposed opposite to the cold plate tray and is bonded to the shoulder of the cell module on the side away from the cold plate tray, corresponding to the exhaust channel. The orthographic projection of the intermediate sealing plate on the cold plate tray covers the orthographic projection of the exhaust channel on the cold plate tray.

7. The battery pack according to claim 6, characterized in that, The two brackets are respectively bonded to the shoulder of the two rows of battery cell modules on the side away from the exhaust channel; The battery pack also includes a side sealing plate, the four edges of which are respectively bonded to the side beam, the cold plate tray, the bracket and the electrical box. The side sealing plate forms an electrical connection sealing cavity by cooperating with the side beam, the cold plate tray, the bracket and the electrical box.

8. The battery pack according to claim 7, characterized in that, The bracket is provided with a second sealant layer at the positions where it overlaps with the side beam and the electrical box, respectively.

9. The battery pack according to claim 6, characterized in that, The inner side of the side beam is provided with a clearance groove extending in a first direction, and a second conductive connector is provided in the clearance groove. The two rows of battery cell modules are connected in series through the second conductive connector.

10. The battery pack according to claim 2, characterized in that, Each of the battery cells is provided with a cell explosion-proof valve on the side near the exhaust channel, and the electrical box is provided with a battery explosion-proof valve at the position corresponding to the exhaust channel.

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