Battery module and power battery pack

Abstract

To provide a battery module that can reduce the internal resistance of a battery and improve high-current charge and discharge performance and safety performance of the battery.SOLUTION: A battery module, a power battery pack and a vehicle are provided. The battery module 1000 comprises n single cells 100. At least two surfaces of a single cell are provided with a first positive terminal 11 and a first negative terminal 12 and with a second positive terminal 13 and a second negative terminal 14, respectively. The n single cells are connected in series and arranged side by side. The single cells have a length L and a width H, where L meets 600 mm<L≤1300 mm, and L and H meet 10<L / H≤20.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] (CROSS REFERENCE TO RELATED APPLICATIONS) This application was filed on June 21, 2019 by BYD Company Limited. , the invention title of which is "Battery module, power battery pack and vehicle" Chinese patent application No. "2019 This application claims priority from US Pat. No. 20942577.2, the entire contents of which are incorporated herein by reference. This application is hereby incorporated by reference.

[0002] The present application relates to the technical field of vehicle manufacturing, in particular to a battery module and a vehicle having the battery module The present invention relates to a power battery pack and a vehicle having the power battery pack. [Background technology]

[0003] In recent years, with the vigorous development of new energy vehicles, the performance requirements for on-board batteries have also increased. The Ministry of Industry and Information Technology, the National Development and Reform Commission, and the Ministry of Science and Technology jointly formulated the "Medium- to Long-Term Development Plan for the Automotive Industry." "By 2020, the specific energy of lithium-ion power battery cells will reach 300W. h / kg, the specific energy of the system reaches 260Wh / kg, and the cost is 1 yuan / Wh, operating environment is -30℃~55℃, 3C charging capability, 2025 Clarify China's power battery target of reaching 350Wh / kg per cell by year.

[0004] To achieve the above goal, the battery capacity and Improving the unitization efficiency of the entire battery pack and the battery cell is currently the main design direction. However, the battery dimensions are too large, and the current is transmitted to the tab side through the current collector before the tab is removed. The current collection path inside the battery electrode sheet is too long, which increases the internal resistance. This will affect the large current charging and discharging performance and safety performance of the power battery. Summary of the Invention

[0005] The present application seeks to solve at least one of the technical problems in the prior art. 2. One object of the present invention is to reduce the internal resistance of a battery, and improve the large current charging and discharging performance and safety performance of the battery. The object of the present invention is to provide a battery module that can improve the above-mentioned.

[0006] The battery modules according to the embodiments of the present application each have a plurality of surfaces and at least two A first positive terminal and a first negative terminal are provided on one of the faces, and at least A second positive terminal and a second negative terminal are provided on the other of the two surfaces. The n number of cells are connected in series and arranged side by side. , the first negative electrode terminal of the (k-1)th cell is connected to the first positive electrode terminal of the kth cell. the first negative terminal of the k-th cell is connected to the (k+1)-th cell; the second negative electrode terminal of the (k-1)-th cell is connected to the first positive electrode terminal of the (k-1)-th cell; The second positive electrode terminal of the k-th cell is connected to the second positive electrode terminal of the k-th cell, and the second negative electrode terminal of the k-th cell is connected to the second positive electrode terminal of the k-th cell. k is connected to the second positive electrode terminal of the (n+1)-th cell, where 2≦k≦n-1, n≧3 and The unit cell includes a core (electrode body) and has a length direction and a width direction perpendicular to the length direction. the core includes a positive electrode sheet, an insulating separator, and a negative electrode sheet, which are laminated in order; A positive electrode tab is electrically connected to each end of the positive electrode sheet along the length direction, Negative electrode tabs are electrically connected to both ends of the negative electrode sheet along the length direction, The positive electrode tab and the negative electrode tab are provided at either end of the width direction so as to be shifted along the width direction. can be.

[0007] In the battery module according to the embodiment of the present application, each cell has at least two pairs of positive and negative terminals. Since the two pairs of positive and negative terminals can be connected to the outside (other cells) at the same time, It reduces internal resistance, realizes bidirectional extraction, increases the current passing capacity of the single cell, and This allows for a reduction in the number of batteries required. Each battery is designed with multiple tabs to draw current, so the inside of the battery The current collection path is shortened, the internal resistance of the battery is reduced, and the battery's large current charging and discharging performance and safety performance are improved. Significantly improve.

[0008] The present application further provides a power battery pack.

[0009] The power battery pack according to the embodiment of the present application includes a battery pack case and a and a plurality of the cells according to any one of the above embodiments attached to the battery.

[0010] The power battery pack according to the embodiment of the present application includes the battery module in the battery pack case. A thermally conductive insulating layer is filled that encases the

[0011] The present application further provides a vehicle.

[0012] A vehicle according to an embodiment of the present application has a power battery pack according to any one of the above embodiments. do.

[0013] The vehicle, the power battery pack and the battery module have the same advantages over the prior art. points, and the description will be omitted here.

[0014] Additional aspects and advantages of the present application are set forth in part in the description that follows and in part in the description that follows. It will become apparent in the description or be learned by the practice of this application. [Brief description of the drawings]

[0015] The above and / or additional aspects and advantages of the present application are described below with reference to the accompanying drawings, in which: This makes it clear and easy to understand.

[0016] [Figure 1] FIG. 2 is a schematic diagram of a single cell of a battery module according to an embodiment of the present application. [Diagram 2] 1 is a schematic diagram of a battery module according to an embodiment of the present application; [Diagram 3] FIG. 2 is a schematic diagram of a preferred embodiment of a core (electrode body). [Figure 4] FIG. 4 is a schematic exploded view of the core in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the present embodiments, examples of which are illustrated in the drawings and referenced throughout. The same or similar reference numbers indicate the same or similar parts or parts having the same or similar functions. The embodiments described below with reference to the drawings are illustrative and are not intended to be limiting of the present application. These are merely examples and should not be construed as limiting the present application.

[0018] Hereinafter, a battery module 1000 according to an embodiment of the present application will be described with reference to FIGS. The battery module 1000 has at least two pairs of positive and negative terminals. Since the positive and negative terminals of the battery 100 can be connected to the outside (another battery 100) at the same time, 00's current passing capacity, realizing bidirectional extraction, and reducing the internal resistance of the single cell 100 This reduces the number of batteries required and allows for a series connection.

[0019] As shown in FIG. 1 and FIG. 2, a battery module 1000 according to an embodiment of the present application includes n single batteries. Includes 100 ponds.

[0020] The cell 100 has a plurality of faces, and a first positive electrode is disposed on one of at least two faces. A terminal 11 and a first negative terminal 12 are provided, and another surface of the at least two surfaces A second positive electrode terminal 13 and a second negative electrode terminal 14 are provided on the first electrode 11 .

[0021] The cell 100 includes a first positive terminal 11, a first negative terminal 12, a second positive terminal 13, and It can be electrically connected to the outside (another cell 100) via the second negative electrode terminal 14. .

[0022] The unit cell has a first end surface and a second end surface, and is disposed so that the first end surface and the second end surface face each other. a first positive terminal and a first negative terminal are provided on the first end surface, and a second positive terminal and A second negative electrode terminal is provided on the second end surface, and thus the first positive electrode terminal 1 1 and the second positive electrode terminal 13 are spaced apart, and the first negative electrode terminal 12 and the second negative electrode terminal 14 are spaced apart. Therefore, the contact between the first positive electrode terminal 11 and the second positive electrode terminal 13 and the contact between the first negative electrode terminal 12 and the second This prevents the negative electrode terminals 14 from coming into contact with each other, avoids the situation in which the cells 100 are short-circuited, and improves the use of the cells 100. The safety of use can be improved, and two adjacent unit cells 100 can be connected to each other by the connection sheet 10. 1 makes it easier to connect.

[0023] As shown in FIG. 2, the first positive electrode terminals 11 of the two adjacent cells 100 is connected to the second first negative terminal 12, and the first negative terminals of the two adjacent cells 100 are connected to the second first negative terminals 12. The second positive electrode terminal 13 is connected to the second negative electrode terminal 14. The portion is in communication with the first positive electrode terminal 11 and the first negative electrode terminal 12, and is also in communication with the second positive electrode terminal 13 and the second negative terminal 14.

[0024] In this way, two adjacent cells 100 are connected via two pairs of electrode terminals, and a current The passing ability can be improved, and the safety and stability of the use of the cell 100 can be improved. In addition, the single battery 100 realizes bidirectional extraction, shortens the current transmission path, and reduces the internal resistance of the battery. This significantly reduces the resistance and improves the current passing efficiency.

[0025] The single cell 100 is designed with four electrode terminals to reduce the size of the single electrode terminal and To reduce the difficulty of sealing and manufacturing one electrode terminal, to facilitate manufacturing, and to reduce production costs. It is possible.

[0026] As shown in FIG. 2 , n cells 100 are connected in series and arranged side by side, the first negative electrode terminal 12 of the (k-1)th cell 100 is connected to the first positive electrode terminal 11 of the kth cell 100, the first negative electrode terminal 12 of the kth cell 100 is connected to the first positive electrode terminal 11 of the (k+1)th cell 100, the second negative electrode terminal 14 of the (k-1)th cell 100 is connected to the second positive electrode terminal 13 of the kth cell 100, and the second negative electrode terminal 14 of the kth cell 100 is connected to the second positive electrode terminal 13 of the (k+1)th cell 100, where 2≦k≦n-1, n≧3, i.e., the number of cells 100 is at least three. In this way, n cells 100are connected together in sequence via the negative and positive terminals, and the positive and negative terminals of two adjacent cells 100 are electrically connected via a connection sheet 101, so that the current passing capacity of the battery module 1000 is higher. In some embodiments, as shown in FIG. 2, there are six cells 100, and the six cells 100 are connected in series and arranged side by side, with the first negative terminal 12 of the first cell 100 connected to the first positive terminal 11 of the second cell 100, and the first negative terminal 12 of the second cell 100 connected to the first positive terminal 11 of the third cell 100. The second negative terminal 14 of the first cell 100 is connected to the second positive terminal 13 of the second cell 100, and the second negative terminal 14 of the second cell 100 is connected to the second positive terminal 13 of the third cell 100.

[0027] In this manner, the six cells 100 are connected to each other via the first negative terminal 12 and the first positive terminal 11. That is, the current passes through the first negative terminal 12 and the first positive terminal 11. Also, they are connected together in sequence via the second negative terminal 14 and the second positive terminal 13, i.e. Current passes through the second negative terminal 14 and the second positive terminal 13. This allows the cell 100 is designed with four electrode terminals, reducing the size of a single electrode terminal and The difficulty of sealing and manufacturing the terminals can be reduced, and the current passing capacity can be improved, The safety and stability of the use of the battery 100 can be improved, and the battery 100 is bidirectional. It realizes the extraction, shortens the current transmission path, greatly reduces the internal resistance of the battery, and improves the current passing Efficiency can be improved.

[0028] The cell 100 includes a core (electrode body) and is formed in a length direction and a width direction perpendicular to the length direction. The core includes a positive electrode sheet, an insulating separator, and a negative electrode sheet, which are laminated in order. The positive electrode tabs are electrically connected to both ends of the positive electrode sheet along the length direction. The negative electrode tabs are electrically connected to both ends of the negative electrode sheet. The positive electrode tab and the negative electrode tab are provided offset in the width direction.

[0029] According to the embodiment of the present application 100 batteries has at least two pairs of positive and negative electrode terminals, and the two pairs of positive and negative electrode terminals can be connected to the outside (other single cells 100) at the same time, which increases the current passing capacity of the single cells 100, enables bidirectional extraction, reduces the internal resistance of the single cells 100, and enables series connection, thereby reducing the number of batteries.

[0030] In some embodiments, the battery module 1000 includes n cells 100 .

[0031] The cell 100 includes a case and a core.

[0032] The core is located within a case, the case having a first end face and a second end face, and a first positive electrode The terminal 11 and the first negative electrode terminal 12 are provided on the first end face, and the second positive electrode terminal 13 and The second negative terminal 14 is provided on the second end face, and the core has a first end and a second end. A plurality of first positive electrode tabs and a first negative electrode tab extend from the first end, and the first positive electrode tabs The first positive electrode tab is connected to the first negative electrode terminal 12, and the second negative electrode tab is connected to the first positive electrode terminal 13. A plurality of second positive electrode tabs and second negative electrode tabs extend from the end of the second positive electrode tab. The first tab is connected to a positive terminal 13 and the second negative tab is connected to a second negative terminal 14.

[0033] In some embodiments, a first end plate and a second end plate are disposed opposite each other on opposite ends of the case. A first positive electrode terminal 11 and a first negative electrode terminal 12 are provided on the first end plate, and A second positive terminal 13 and a second negative terminal 14 are provided on the second end plate, i.e., each cell 10 A first positive terminal 11 and a first negative terminal 12 are provided on a first end plate of each of the cells 10. A second positive terminal 13 and a second negative terminal 14 are provided on a second end plate of the battery 10. 0 is a first positive electrode terminal 11, a first negative electrode terminal 12, a second positive electrode terminal 13, and a second negative electrode terminal The cell 100 can be electrically connected to the outside (another cell 100) via the terminal 14.

[0034] As shown in FIG. 2, the electrode terminals pass through the corresponding end plates and are connected to a first positive terminal 11 and a first The negative electrode terminal 12 passes through the first end plate, and the second positive electrode terminal 13 and the second negative electrode terminal 14 are , the second end plate is penetrated, that is, both ends of the electrode terminal are respectively located on both sides of the end plate, and the electrode terminal The first end of the capacitor is located within the case to electrically connect the capacitor to the storage element within the mounting cavity. and the second end of the electrode terminal is located outside the case. It is used to electrically connect to an external power consuming device, and thus, The electrical energy can be output to an external power consuming device. The ends of the cells 100 are connected to adjacent cells 100 to connect the cells 100 in series, and This allows a plurality of cells 100 to be charged and discharged simultaneously, thereby improving the efficiency of use of the battery pack.

[0035] In this way, two adjacent cells 100 are connected via two pairs of electrode terminals, and a current The passing ability can be improved, and the safety and stability of the use of the cell 100 can be improved. In addition, the single battery 100 realizes bidirectional extraction, shortens the current transmission path, and reduces the internal resistance of the battery. This significantly reduces the resistance and improves the current passing efficiency.

[0036] As shown in FIG. 2, n single cells 100 are connected in series and arranged side by side. The first positive terminal 11 and the first negative terminal 12 penetrate the first end plate, and the second positive terminal 1 3 and the second negative terminal 14 penetrate the second end plate. The first negative terminal 12 of the (k - 1)-th single cell 100 is connected to the first positive terminal 11 of the k-th single cell 100, and the first negative terminal 12 of the k-th single cell 100 is connected to the first positive terminal 11 of the (k + 1)-th single cell 100. The second negative terminal 14 of the (k - 1)-th single cell 100 is connected to the second positive terminal 13 of the k-th single cell 100, and the second negative terminal 14 of the k-th single cell 100 is connected to the second positive terminal 13 of the (k + 1)-th single cell 100, where 2 ≤ k ≤ n - 1 and n ≥ 3, that is, there are at least three single cells 100. In this way, the n single cells 100 are integrally connected in sequence via negative terminals and positive terminals, and the positive and negative terminals of two adjacent single cells 100 are electrically connected via a connection sheet 101.

[0037] In some embodiments, the length of the single cell 100 is L, the width is H, and the thickness is T, satisfying 10 < L / H, and in some specific implementations, 10 < L / H ≤ 20, 23 ≤ L / T ≤ 200. For example, L / H = 12, L / T = 60, or L / H = 14, L / T = 120, or L / H = 18, L / T = 180. Thus, when the design dimensions of the single cell 100 are within this range, the overall structure of the single cell 100 conforms to a standardized design and can be applied to different power batteries Module 1000, thereby expanding the scope of application.

[0038] The ratio design of the length, width, and thickness dimensions of the single cell 100 helps to improve the energy density of the entire power battery pack, and a more preferable volume ratio is obtained.

[0039] The length of the cell 100 satisfies 600mm≦L≦1300mm, and in actual implementation For example, L = 800 mm or L = 90 If the size of the cell 100 is too large, the current This tends to decrease the passing ability and increase the resistance of the current collector. The meter is within a reasonable range, the output current of the single cell 100 is large, and the current passing through the single cell 100 To ensure high capacity and reduce the design and sealing difficulties of the cell 100. can be done.

[0040] In some embodiments, the cell 100 includes a case and a core.

[0041] The end plates of the case are provided with electrode terminals for electrical connection to the outside, and the end plates are The housing includes a first end plate and a second end plate provided at both ends thereof, the first end plate and the second end plate being: The first end plate and the second end plate are arranged opposite each other, and each end plate has a positive terminal and a negative terminal. For example, a first positive terminal 11 and a first negative terminal 12 are provided on the first end plate of each cell 100. A terminal 12 is provided, and a second positive terminal 13 and a second negative terminal 14 are provided on the second end plate of each cell 100. The battery 100 is provided with a first positive terminal 11, a first negative terminal 12, a third terminal 13, and a fourth terminal 14. The positive electrode terminal 13 of the first cell 100 and the negative electrode terminal 14 of the second cell 100 are electrically connected to the outside (other cells 100). It can be connected.

[0042] The positive and negative terminals pass through the first and second end plates, and are connected to the first positive terminal 11 and The first end plate is connected to the first positive terminal 13 and the second negative terminal 12. 14 penetrates the second end plate, that is, both ends of the electrode terminal are located on both sides of the end plate, The first end of the pole terminal is located within the case to connect to the storage element within the mounting cavity. The second end of the electrode terminal is electrically connected to the case and is located outside the case. The power supply 10 is used to electrically connect to an external power consuming device. The electrical energy within the device can be output to an external power consuming device.

[0043] The core is housed in a case and acts as a storage element within the case, charging and discharging to the outside. A positive electrode tab and a negative electrode tab are provided on both ends of the anode. a positive electrode tab connected to a corresponding positive terminal and a negative electrode tab connected to a corresponding negative terminal. The ends of the electrode terminals that extend into the end plates are electrically connected to the corresponding tabs. One end of the core is electrically connected to a positive terminal via a positive tab, and the other end of the core is electrically connected to a negative terminal. Since it is electrically connected to the negative terminal through the core, it is possible to conduct current between the core and the external circuit. This can be done.

[0044] In some embodiments, the core comprises multiple subcores (electrodes).

[0045] The sub-core includes a positive electrode sheet and a negative electrode sheet, and has an insulating layer between the positive electrode sheet and the negative electrode sheet. A separator is provided, and the insulating separator effectively separates the positive electrode sheet from the negative electrode sheet. This allows both the positive and negative electrode sheets to maintain a normal current flow state, Prevents mutual interference between the positive and negative electrode sheets, and prevents the positive and negative electrode sheets from coming into contact and shorting out. This avoids the above problem and improves the safety of the cell 100. The insulating separator effectively separates the positive and negative electrodes. The distance can be effectively increased.

[0046] The positive electrode tab is electrically connected to the positive electrode sheet, and the negative electrode tab is electrically connected to the negative electrode sheet. In some embodiments, the core includes at least two sub-cores, The positive electrode sheet of one of the sub-cores is adjacent to the negative electrode sheet of the other sub-core. In this way, the core is formed by alternately stacking a plurality of positive electrode sheets and a plurality of negative electrode sheets. This effectively increases the battery capacity of the single cell 100 and realizes current draw from the core. Easy to do.

[0047] The direction in which the positive and negative tabs are pulled out from adjacent sub-cores is , positive electrode tab, negative electrode tab, positive electrode tab, negative electrode tab, etc., are reversed. The tabs are pulled out from different sides, facilitating the distribution of the entire structure of the cell 100. , making the distribution of the entire structure of the cell 100 more uniform.

[0048] The sub-cores are stacked in the thickness direction of the cell 100 .

[0049] 3 and 4, in some embodiments, the cell 100 may include two sub-cells. The two sub-cores are stacked in the thickness direction of the cell 100. The arrangement direction of the sub-cores is the same as the lamination arrangement direction of the corresponding positive electrode sheets and negative electrode sheets. Therefore, each sub-core is in stable contact with the other sub-cores and is stably held within the case. The positive and negative electrode tabs of each sub-core are fixed relative to each other. In this way, the positions of the positive electrode tabs and the negative electrode tabs are concentrated. Avoid overheating, prevent short circuit caused by contact between positive and negative electrode sheets, and The safety of the pond 100 can be provided.

[0050] For example, in a specific implementation, the core 100a of the cell 100 includes a first sub-core 10 and a second subcore 20.

[0051] The first sub-core 10 is made up of a first negative electrode sheet 130, an insulating separator 131, and a second negative electrode sheet 132. The positive electrode sheet 110 includes a first positive electrode sheet 120 and a second positive electrode sheet 110 .

[0052] The second sub-core 20 is made up of a second negative electrode sheet 230, an insulating separator 240, and a second negative electrode sheet 240, which are laminated in this order. The core 100a includes a second negative electrode sheet 220 and a second positive electrode sheet 210. The electrode sheet 230 is disposed adjacent to the first positive electrode sheet 110 and is sandwiched between the insulating separator 120. (or 220).

[0053] First positive electrode tabs 1101 are provided on both ends of the first positive electrode sheet 110 along the length direction. The two first positive electrode tabs 1101 are arranged on one side of the first positive electrode sheet 110 in the width direction. In other words, the two first positive electrode tabs 1101 are adjacent to the edge of the first positive electrode sheet 11. 0, which makes it easier to provide the tab offset along the width direction.

[0054] A first negative electrode tab 1301 is provided at each end of the first negative electrode sheet 130 along the length direction, and the two first negative electrode tabs 1301 are 130In other words, the two first negative electrode tabs 1301 are offset from the center in the width direction of the first negative electrode sheet 130. After , an insulating separator 120 and a first positive electrode sheet 110 are continuously stacked, The first positive electrode tab 1101 and the first negative electrode tab 1301 are located on both sides in the width direction, that is, are offset from each other.

[0055] Similarly, second positive electrode tabs 21 are provided at both ends of the second positive electrode sheet 210 along the length direction. 01 is provided, and two second positive electrode tabs 2101 are provided in the width direction of the second positive electrode sheet 210. In other words, the two second positive electrode tabs 2101 are adjacent to the edge of one side of the second positive electrode slot. 210, the tabs are offset from the center in the width direction of the sheet 210, making it easier to offset the tabs along the width direction. stomach.

[0056] A second negative electrode tab 2301 is provided at each end of the second negative electrode sheet 230 along the length direction, and the two second negative electrode tabs 2301 are 230 In other words, the two second negative electrode tabs 2301 are offset from the center in the width direction of the second negative electrode sheet 230. In the second subcore 20, the second positive electrode tab 2101 and the second negative electrode tab 2301 are located on both sides in the width direction, i.e., offset, behind the second negative electrode sheet 230, the insulating separator 220, and the second positive electrode sheet 210.

[0057] Adjacent tabs of the first subcore 10 and the second subcore 20 are the first positive electrode tab 1101 and a second negative electrode tab 2301, and the first positive electrode tab 1101 and the second negative electrode tab 2301 The pull-out directions are on both sides of the width direction, i.e., the pull-out directions are opposite and offset. It is also possible to do this.

[0058] The width of the positive or negative tab is H1, and the width of the positive or negative sheet in the core is H 2. 35%≦H1 / H2≦45% is satisfied. For example, H1 / H2=37%, or H1 / H2=40%, or H1 / H2=42%, i.e., the width of the tab is the same as that of the positive electrode sheet or the negative electrode sheet. The width of the positive electrode sheet or the negative electrode sheet is smaller than the width of the positive electrode sheet or the negative electrode sheet. When the tab is connected to the positive or negative electrode sheet, the contact width is the width of the tab. It is possible to stably conduct electric current to the electrode sheet or the negative electrode sheet.

[0059] The current passing width of the positive electrode sheet or the negative electrode sheet is larger than the current passing width of the tab. The width of the electrode terminal is larger than the width of the electrode terminal, and the thickness of the electrode terminal is large. The core, tabs and electrode terminals all have excellent current passing capabilities, and thus the single cell The battery 100 has excellent charging and discharging capabilities, and can also output electrical energy to an external power consuming device. It also improves the charging efficiency of the device itself, reducing the charging and discharging time required by the user. It saves time, reduces costs, and is easy for users to use.

[0060] The tab and the core each have a large contact surface, and the electrode terminal, the tab and the core are attached. When the tab and the electrode terminal are mated, the tab and the core have a large contact area. Thus, the current passing efficiency between the electrode terminal, the tab, and the core is improved. Both of these make it easy to attach and fix the tab, core, and electrode terminal, and they can be used safely for a long time. This maintains a stable contact state, improves assembly efficiency, extends the service life, and This reduces the design accuracy and process difficulty of 0 and increases the current passing capacity.

[0061] In some embodiments, the cell 100 further comprises an insulating spacer.

[0062] The insulating spacer is provided between the end plate and the core, i.e., the insulating spacer is disposed at the end of the core. , which has good insulation performance and separates the positive electrode tab and the negative electrode tab, thus This prevents the positive and negative tabs from coming into direct contact with each other. All the tabs maintain a normal current flow state, preventing mutual interference between the positive and negative tabs. The electrode tab and the negative electrode tab are prevented from coming into contact with each other and causing a short circuit, thereby improving the safety of the single cell 100. .

[0063] The insulating spacer has a partition plate, the partition plate extends toward the core, and the insulating spacer The positive electrode tab and the negative electrode tab are disposed in a direction gradually approaching the core from the positive electrode tab toward the side surface of the core. The positive and negative tabs are located on both sides of the partition plate and are in contact with the surface of the partition plate. The area is larger than the area of ​​the positive and negative tabs, so that the positive and negative tabs can be effectively This prevents the positive and negative tabs from interfering with each other and prevents the positive and negative tabs from coming into contact and shorting out. This avoids the occurrence of the above problem, thereby improving the safety of the cell 100.

[0064] The free end of the partition plate is adapted to be pressed against the core, thereby separating the positive and negative tabs. Ensure there are no gaps between the positive and negative tabs and that they do not completely conduct current. The safety of the battery 100 is improved.

[0065] In some embodiments, the separator is multiple, and the multiple separators separate the positive and negative tabs. The partitions are arranged at a distance from each other along the connecting direction, and the distance between two adjacent partitions is The thickness of the partition plate is larger than the thickness of the battery body. Thus, the battery cell 100 vibrates under the force. When the partition is deformed, the space between the two partitions allows for some deformation of the partition. Since the positive and negative tabs do not exceed the interval, the positive and negative tabs do not come into contact with each other. This more effectively prevents the battery from collapsing, thereby improving the safety of the battery 100.

[0066] A plurality of escape holes are provided in the insulating spacer, and the positive electrode tab or the negative electrode tab passes through the escape holes. The insulating spacer is adapted to be connected to a corresponding positive or negative terminal by a The insulation protection is provided for the positive and negative electrode tabs, and the tabs and electrode terminals are properly connected. It does not affect the communication and further ensures that the core is connected to the electrode terminal via the tab, Charging and discharging the battery 100 is easy to achieve.

[0067] In some embodiments, at least one of the two end plates is provided with a puller sheet. The lead sheet is provided on the side facing the core and is directly electrically connected to the tab and the electrode terminal. That is, the inner end of the lead sheet is electrically connected to the tab, and the outer end is electrically connected to the electrode terminal. In this way, the core and the electrode terminal are electrically connected by the tab and the lead sheet. By providing the lead sheet in this manner, the length of the electrode terminal or tab can be shortened. This reduces poor contact caused by excessive pulling out of the tabs and electrode terminals. 1. Ensure effective contact with the sheet and improve the stability of current conduction of the cell 100; Easy to use in the long term.

[0068] The width of the tab is the contact width between the pull-out sheet and the tab, and the width of the pull-out sheet is the contact width between the pull-out sheet and the tab. Since the contact width is greater than the contact width, the current passing width between the lead sheet and the tab is the width of the tab itself, The width of the tab is large. In this way, excellent current passing efficiency is achieved between the lead sheet and the tab. This ensures that the cell 100 has a high current passing capacity.

[0069] The tab 12 is integrated with the current collector, and the tab 12 and the current collector are made of copper foil or aluminum foil. On the one hand, the tab 12 can be formed quickly, reducing process costs, since the tab 12 is formed by cutting. On the other hand, the integration of the tab and the current collector improves the current transmission performance, and the tab 12 The shape can be die-cut according to actual needs, making it easy to mold the structure and easy to utilize. It is possible.

[0070] In some embodiments, the electrode sheets in core 15 further include a current collector.

[0071] The current collector includes a cover region and an insulating region, the insulating region being disposed between the tab and the cover region. The insulating layer is made of insulating rubber or inorganic ceramic particle material. It is made of a material that insulates and protects the tab, preventing the structure of the tab from being destroyed. This can prevent accidental contact and improve the safety of using the tab.

[0072] In some embodiments, the cell 100 further includes an explosion-proof valve.

[0073] The explosion-proof valve is provided on the end plate and is located outside the two electrode terminals, and serves as a pressure reducing device for the unit cell 100. When the pressure inside the cell 100 is abnormal and too high, the pressure can be reduced and the cell can be installed. The pressure in the cavity is kept within a safe range, thus preventing the internal pressure of the cell 100 from increasing. This prevents the battery from expanding and deforming as a whole, thereby improving the safety and stability of the battery 100. It can be raised.

[0074] In some embodiments, the case contains a single core having one end connected to a positive terminal. The other end is electrically connected to the negative terminal. That is, the core may be formed by stacking a plurality of electrode sheets, and thus each electrode sheet The ends of the core are electrically connected to the electrode terminals at both ends, and the core and the electrode terminals are well connected. Naturally, the core may be a wound core. well as a current conducting role.

[0075] The present application further provides another battery module 1000.

[0076] The battery module 1000 according to the embodiment of the present application includes two cells 100 .

[0077] A first positive terminal 11 and a first negative terminal 12 are provided on a first end plate of each unit cell 100. A second positive terminal 13 and a second negative terminal 14 are provided on the second end plate of each unit cell 100. The two cells 100 are connected in series and arranged side by side, and the first cell 100 The first negative electrode terminal 12 of the first cell 100 is connected to the first positive electrode terminal 11 of the second cell 100. The second negative terminal 14 of the first cell 100 is connected to the second positive terminal 13 of the second cell 100. In this way, the single cell 100 realizes bidirectional extraction and provides a current transmission path. This shortens the time required for each battery, greatly reducing the internal resistance of the battery and improving the current passing efficiency. By designing four electrode terminals in the pond 100, the size of a single electrode terminal is reduced, and a single This can reduce the difficulty of sealing and manufacturing the electrode terminals.

[0078] The present application further provides a power battery pack.

[0079] The power battery pack according to the embodiment of the present application comprises a battery pack case and a plurality of the above-mentioned embodiments. The battery includes a single battery 100.

[0080] The battery cell 100 is mounted in a battery pack case, and the multiple batteries 100 are arranged in order. The upper and lower ends of the plurality of unit cells 100 are held in the same plane. The electrode terminals of the multiple cells 100 can be connected in series by a connection sheet 101. A plurality of cells 100 are simultaneously charged and discharged, improving the charging and discharging efficiency of the power battery pack, and The battery capacity of the battery pack can be improved.

[0081] The battery pack case is filled with a heat conductive insulating layer that encases the battery module 1000. The insulating layer effectively separates the battery module 1000 from the battery pack case, The battery module 1000 is provided with a plurality of cells 100 each having a different capacity. By providing protection against excessive pressure on the battery module 1000, the structure is It can prevent deformation and improve the safety of the power battery pack. The layer may be made of a rubber material.

[0082] The present application further provides a vehicle.

[0083] A vehicle according to an embodiment of the present application is provided with the power battery pack of the above embodiment. If one of the cells 100 fails, the other cells 100 can still be used normally. This ensures that the vehicle always outputs stable power, improving the practicality and safety of the entire vehicle. This makes it easy to maintain the power battery pack. EXAMPLES

[0084] The cell includes a case and a core located within the case, and the core is provided on each of two sides of the case. Electrode terminals are provided which are electrically connected to the armature and extend from the case to draw out current. There are two electrode terminals on the surface, and the core is provided with tabs. The electrode terminals are connected to the core by the tabs. where L is the length of the cell and H is the width of the cell, where L / H = 11, L = 400 mm, and the cell is denoted as S1. EXAMPLES

[0085] Compared with Example 1, L / H=13, L=600 mm, and the single cell is designated as S2. Things are different. EXAMPLES

[0086] Compared with Example 1, L / H=15, L=800 mm, and the single cell is designated as S3. Things are different. EXAMPLES

[0087] Compared with Example 1, L / H=17, L=1000 mm, and the single cell is designated as S4. The differences are: EXAMPLES

[0088] Compared with Example 1, L / H=23, L=1300mm, L / T=50, and the single cell The difference is that it is written as S5. EXAMPLES

[0089] Compared with Example 1, L / H=11, L=1300mm, L / T=100, and the single-phase The difference is that the pond is written as S6.

[0090] Working Example 7 Example 12 The battery module includes n cells (each of the cells is one of S1 to S6), each of the cells having a plurality of surfaces, a first positive electrode terminal and a first negative electrode terminal provided on one of the at least two surfaces, and a second positive electrode terminal and a second negative electrode terminal provided on the other of the at least two surfaces; The n cells are connected in series and arranged side by side, the first negative terminal of the (k-1)th cell is connected to the first positive terminal of the kth cell, and the first negative terminal of the kth cell is connected to the first positive terminal of the (k+1)th cell; The second negative electrode terminal of the (k-1)th cell is connected to the second positive electrode terminal of the kth cell, and the second negative electrode terminal of the kth cell is connected to the second positive electrode terminal (13) of the (k+1)th cell (100), where 2≦k≦n-1, n=6, and the battery modules are denoted as Z6 to Z12, respectively.

[0091] Comparative Example 1 Compared to Example 2, there is a pair of tabs on each end of the core, and the two opposing faces of the case The difference is that each cell has one electrode terminal, and the single cell is written as D1.

[0092] Comparative Example 2 Compared to Example 3, there is a pair of tabs on each end of the core, and the two opposing faces of the case The difference is that each cell has one electrode terminal, and the single cell is written as D2.

[0093] Comparative Example 3 Compared with Example 1, L / H=2.5, L=400 mm, and the single cell is designated as D3. The differences are:

[0094] In Comparative Examples 4 to 6, n number of single cells (one of D1, D2, and D3) are connected in series. Thus, battery modules are obtained, and the battery modules are designated as D4 to D6, respectively.

[0095] 1) Test Method :single Battery DC resistance (DCIR) Test equipment: Charge / discharge test equipment Test method: The device was adjusted to be at room temperature, and discharge DCIR parameters were measured under conditions of 50% SOC and 1.5C@30s. The test results for Examples 1 to 7 and Comparative Examples 1 to 3 are shown in Table 1 (the test method is a common method in this field).

[0096] 2) Heating up due to current flow Test equipment: Charge / discharge test equipment, thermocouple, Agilent data collector Test method: Adjust the device to be in an insulated environment and under 2C continuous charge / discharge test conditions, and then The temperature rise parameters of the terminal and the lead sheet were measured, and Examples 1 to 6 and Comparative Examples 1 to The test results of Example 3 are shown in Table 1 (the test methods are common methods in this field).

[0097] 3) Energy Efficiency Testing Test equipment: Charge / discharge test equipment Test method: The charge / discharge test device is electrically connected, and the battery is charged and discharged three times continuously at 1C. The parameters of the charge and discharge energy efficiency after the test were measured, and the results are shown in Examples 1 to 6 and Comparative Examples 1 to The test results of Example 3 are shown in Table 1 (the test methods are common methods in this field).

[0098] 4) DCIR of battery module Test equipment: Charge / discharge test equipment Test method: The device was adjusted to be under the conditions of room temperature, 50% SOC, and 1.5C@30s, and the DCIR parameters during discharge were measured. 12, the battery modules in Comparative Examples 4 to 6 were tested, and the test results are shown in Table 1 (the test method is a common method in this field).

[0099]

Table 1

[0100] The battery module (1000) according to the embodiment of the present application has a plurality of surfaces respectively, and at least one of the at least two surfaces is provided with a first positive electrode terminal (11) and a first negative electrode terminal (12), and the other of the at least two surfaces is provided with a second positive electrode terminal (13) and a second negative electrode terminal (14), and includes n single cells (100). The n single cells (100) are connected in series and arranged side by side. The first negative electrode terminal (12) of the (k - 1)-th single cell (100) is connected to the first positive electrode terminal (11) of the k-th single cell (100), and the first negative electrode terminal ( 12) of the k-th single cell (100) is connected to the first positive electrode terminal ( 11) of the (k + 1)-th single cell (100). The second negative electrode terminal (14) of the (k - 1)-th single cell (100) is connected to the second positive electrode terminal (13) of the k-th single cell (100), and the second negative electrode terminal ( 14) of the k-th single cell (100) is connected to the second positive electrode terminal ( 13) of the (k + 1)-th single cell (100), where 2 ≤ k ≤ n - 1 and n ≥ 3. The single cell (100) has a length L and a width H, and the L satisfies 600 mm < L ≤ 1300 mm, and the L and H satisfy 10 < L / H ≤ 20. In the battery module (1000) according to the embodiment of the present application, the single cells are arranged oppositely.

[0101] The first positive electrode terminal (11) and the first negative electrode terminal (12) have a first end surface and a second end surface disposed thereon. A terminal (12) is provided on the first end surface, and the second positive terminal (13) and the second A negative electrode terminal (14) is provided on the second end surface.

[0102] In the battery module (1000) according to the embodiment of the present application, the unit cell (100) is The core includes a case and a core positioned within the case, the case having a first end face and a second end face. The first positive terminal (11) and the first negative terminal (12) are disposed on the first end the second positive electrode terminal (13) and the second negative electrode terminal (14) are provided on the second surface of the The core has a first end and a second end, and the first end is A plurality of first positive electrode tabs and a first negative electrode tab extend therefrom, the first positive electrode tabs being in contact with the first negative electrode tabs. The first negative electrode tab is connected to the first negative electrode terminal (11), and the first negative electrode tab is connected to the first negative electrode terminal (12). a plurality of second positive electrode tabs and a second negative electrode tab extend from the second end; The positive electrode tab is connected to the second positive electrode terminal (13), and the second negative electrode tab is connected to the second negative It is connected to the pole terminal (14).

[0103] In the battery module (1000) according to the embodiment of the present application, A first end plate and a second end plate are provided, the first positive terminal (11) and the upper The first negative electrode terminal (12) is provided on the first end plate and passes through the first end plate. The second positive terminal (13) and the second negative terminal (14) are provided on the second end plate. can be done.

[0104] In the battery module (1000) according to the embodiment of the present application, the cores are each The positive electrode sheet includes a plurality of sub-cores each having an insulating separator and a negative electrode sheet. A positive electrode tab is electrically connected to the negative electrode sheet, and a negative electrode tab is electrically connected to the negative electrode sheet. The adjacent tabs of the two sub-cores are located on opposite sides in the width direction. .

[0105] In the battery module (1000) according to the embodiment of the present application, the plurality of sub-cores are The sub-cores are laminated in the thickness direction of the battery cell (100), The positive electrode tab and the negative electrode tab are offset from each other in the width direction of the cell (100).

[0106] The battery module (1000) according to the embodiment of the present application is provided between the end plate and the core. and an insulating spacer separating the positive electrode tab from the negative electrode tab.

[0107] In the battery module (1000) according to the embodiment of the present application, the insulating spacer is A divider plate extends toward the core and is positioned between the positive and negative electrode tabs.

[0108] In the battery module (1000) according to the embodiment of the present application, the partition plate is a plurality of The partition plates are spaced apart from each other along a direction connecting the positive electrode tab and the negative electrode tab. .

[0109] In the battery module (1000) according to the embodiment of the present application, the insulating spacer is provided with a plurality of The positive electrode tab or the negative electrode tab is inserted through the corresponding relief hole. It is suitable for being connected to the positive terminal or the negative terminal.

[0110] In the battery module (1000) according to the embodiment of the present application, 35% ≤ H1 / H2 ≤ 45 %, where H1 is the width of the positive electrode tab or the negative electrode tab, and H2 is the width of the positive electrode sheet or the negative electrode sheet.

[0111] In the battery module (1000) according to the embodiment of the present application, the electrode sheet in the core further includes a current collector, and the positive electrode tab or the negative electrode tab is integrated with the corresponding current collector.

[0112] The further battery module (1000) according to the present application includes two single cells (100) each provided with a first positive electrode terminal (11) and a first negative electrode terminal (12) on each first end plate, and a second positive electrode terminal (13) and a second negative electrode terminal (14) on each second end plate. The two single cells (100) are connected in series and arranged side by side. The first negative electrode terminal (12) of the first single cell (100) is connected to the first positive electrode terminal (11) of the second single cell (100), and the second negative electrode terminal (14) of the first single cell (100) is connected to the second positive electrode terminal (13) of the second single cell (100). The single cell (100) has a length L and a width H, where 600 mm < L ≤ 1300 mm is satisfied, and L and H satisfy 10 < L / H ≤ 20.

[0113] The power battery pack according to the present application includes a battery pack case and the battery module (1000) according to any one of the above items mounted in the battery pack case.

[0114] The power battery pack according to the embodiment of the present application is filled with a heat-conducting insulating layer that wraps the battery module (1000) in the battery pack case. ​

[0115] The vehicle according to the present application has the power battery pack described in the above embodiment.

[0116] In the description herein, the terms "in one embodiment," "in some embodiments," "exemplary implementations," and "exemplary embodiments" may be used interchangeably. Reference to the description "examples," "examples," "specific examples," or "several examples" means that the examples or examples are The specific features, structures, materials, or characteristics described in the examples may be incorporated in at least one of the present application. In the present specification, the term "invention" is used interchangeably with "example". The present invention is not necessarily limited to the same embodiment or example. Any features, structures, materials, or characteristics may be suitably combined in any one or more embodiments or examples. It can be combined.

[0117] Although embodiments of the present application have been illustrated and described, it will be understood by those skilled in the art that the principles and Various changes, modifications, substitutions and variations may be made to these embodiments without departing from the spirit of the invention. The scope of the present application is limited only by the claims and their equivalents. [Explanation of symbols]

[0118] Battery module 1000, single cell 100, first positive electrode terminal 11, first negative electrode terminal 12, The second positive electrode terminal 13, the second negative electrode terminal 14, the connection sheet 101, the core 100a, the first A battery core 10, a first positive electrode sheet 110, an insulating separator 120, and a first negative electrode sheet 130. , first positive electrode tab 1101, first negative electrode tab 1301, second sub-core 20, second positive electrode Sheet 210, insulating separator 220, second negative electrode sheet 230, second positive electrode tab 210 1, second negative electrode tab 2301

Claims

1. A battery module including n single cells (100), each of which has a plurality of faces, a first positive electrode terminal (11) and a first negative electrode terminal (12) disposed on one of the at least two faces, and a second positive electrode terminal (13) and a second negative electrode terminal (14) disposed on the other of the at least two faces, The n cells (100) are connected in series and arranged side by side, The first negative electrode terminal (12) of the (k-1)th cell (100) is connected to the first positive electrode terminal (11) of the kth cell (100), and the first negative electrode terminal (12) of the kth cell (100) is connected to the first positive electrode terminal (11) of the (k+1)th cell (100); The second negative electrode terminal (14) of the (k-1)th cell (100) is connected to the second positive electrode terminal (13) of the kth cell (100), and the second negative electrode terminal (14) of the kth cell (100) is connected to the second positive electrode terminal (13) of the (k+1)th cell (100); 2≦k≦n−1, n≧3, The cell (100) has a length L and a width H, where L satisfies 600 mm<L≦1300 mm, and L and H satisfy 10<L / H≦20; The cell includes a core having a plurality of sub-cores, each of the sub-cores having a positive electrode sheet, an insulating separator, and a negative electrode sheet; The core has first and second longitudinally opposed ends, Each of the positive electrode sheets is electrically connected to a first positive electrode tab at the first end and to a second positive electrode tab at the second end, a plurality of the first positive electrode tabs are each connected to the first positive electrode terminal (11), and a plurality of the second positive electrode tabs are each connected to the second positive electrode terminal (13); Each of the negative electrode sheets is electrically connected to a first negative electrode tab at the first end and to a second negative electrode tab at the second end, a plurality of the first negative electrode tabs are each connected to the first negative electrode terminal (12), and a plurality of the second negative electrode tabs are each connected to the second negative electrode terminal (14). Battery module (1000).

2. The single battery has a first end face and a second end face arranged opposite to each other, the first positive electrode terminal (11) and the first negative electrode terminal (12) are provided on the first end face, and the second positive electrode terminal (13) and the second negative electrode terminal (14) are provided on the second end face. The battery module (1000) of claim 1.

3. The cell (100) is The present invention further includes a case, the core being located within the case; The case has a first end surface and a second end surface, the first positive electrode terminal (11) and the first negative electrode terminal (12) are provided on the first end surface, and the second positive electrode terminal (13) and the second negative electrode terminal (14) are provided on the second end surface, the core has a plurality of first positive electrode tabs and a plurality of first negative electrode tabs extending from the first end, and a plurality of second positive electrode tabs and a plurality of second negative electrode tabs extending from the second end; The battery module (1000) of claim 1.

4. a first end plate and a second end plate are arranged opposite both ends of the case, the first positive terminal (11) and the first negative terminal (12) are provided on the first end plate and pass through the first end plate, and the second positive terminal (13) and the second negative terminal (14) are provided on the second end plate; The battery module (1000) of claim 3.

5. Adjacent tabs in two adjacent subcores are located on opposite sides in the width direction. The battery module (1000) of claim 4.

6. The plurality of sub-cores are stacked along the thickness direction of the battery cell (100), and the positive electrode tab and the negative electrode tab in each sub-core are shifted along the width direction of the battery cell (100). The battery module (1000) of claim 5.

7. and further comprising at least two insulating spacers provided between the first end plate and the core or between the second end plate and the core, respectively, and used to space the positive electrode tab and the negative electrode tab. The battery module (1000) of claim 5.

8. The insulating spacer has a partition plate extending toward the core and positioned between the positive electrode tab and the negative electrode tab. The battery module (1000) of claim 7.

9. the partition plate is a plurality of partition plates, the plurality of partition plates being spaced apart from each other along a direction connecting the positive electrode tab and the negative electrode tab; The battery module (1000) of claim 8.

10. The insulating spacer is provided with a plurality of escape holes, and the positive electrode tab or the negative electrode tab is adapted to be connected to the corresponding positive electrode terminal or the negative electrode terminal through the escape holes. The battery module (1000) of claim 7.

11. 35%≦H1 / H2≦45%, where H1 is the width of the positive electrode tab or the negative electrode tab, and H2 is the width of the positive electrode sheet or the negative electrode sheet; The battery module (1000) of claim 5.

12. The electrode sheet in the core further includes a current collector, and the positive electrode tab or the negative electrode tab is integrated with the corresponding current collector. The battery module (1000) of claim 5.

13. The battery includes two cells (100), each having a first end plate provided with a first positive terminal (11) and a first negative terminal (12), and each having a second end plate provided with a second positive terminal (13) and a second negative terminal (14); The two cells (100) are connected in series and arranged side by side, with the first negative terminal (12) of the first cell (100) being connected to the first positive terminal (11) of the second cell (100); The second negative terminal (14) of the first cell (100) is connected to the second positive terminal (13) of the second cell (100); The cell (100) has a length L and a width H, where L satisfies 600 mm<L≦1300 mm, and L and H satisfy 10<L / H≦20, The cell includes a core having a plurality of sub-cores, each of the sub-cores having a positive electrode sheet, an insulating separator, and a negative electrode sheet; The core has first and second longitudinally opposed ends, Each of the positive electrode sheets is electrically connected to a first positive electrode tab at the first end and to a second positive electrode tab at the second end, a plurality of the first positive electrode tabs are connected to the first positive electrode terminal (11), and a plurality of the second positive electrode tabs are connected to the second positive electrode terminal (13); Each of the negative electrode sheets is electrically connected to a first negative electrode tab at the first end and to a second negative electrode tab at the second end, a plurality of the first negative electrode tabs are each connected to the first negative electrode terminal (12), and a plurality of the second negative electrode tabs are each connected to the second negative electrode terminal (14). Battery module (1000).

14. A battery pack case; and a battery module (1000) according to any one of claims 1 to 13, which is attached in the battery pack case. Power battery pack.

15. A thermally conductive insulating layer is filled in the battery pack case to encase the battery module (1000); 15. The power battery pack of claim 14.

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