High-voltage battery cell body, battery comprising high-voltage battery cell body and battery module comprising high-voltage battery cell body

Abstract

The utility model provides a high-voltage battery cell body, a battery comprising the high-voltage battery cell body and a battery module comprising the high-voltage battery cell body. The high-voltage battery cell body comprises at least two battery cell units, and each battery cell unit is composed of a positive electrode layer, a positive electrode active material layer, at least one bipolar electrode unit, an isolation dielectric layer, a negative electrode active material layer and a negative electrode layer; wherein the bipolar electrode unit is composed of an isolation dielectric layer, a negative electrode active material layer, a middle electrode layer and a positive electrode active material layer; the positive electrode connecting end is formed by connecting all the positive electrode layers in the at least two battery cell units in parallel; and the negative electrode connecting end is formed by connecting all the negative electrode layers in the at least two battery cell units in parallel. The plurality of battery cell units are connected in parallel to form a high-voltage battery cell body, and the voltage of the high-voltage battery cell body depends on the voltage of the battery cell units. The battery formed by the high-voltage battery cell body has the advantages of high voltage, small working voltage fluctuation, stable and reliable working and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to energy storage technology field especially relates to a high voltage electric core body and contain its battery and battery module. BACKGROUND

[0002] The voltage characteristic of a lithium ion battery is one of its important performance indicators. The standard voltage of a lithium ion battery is usually slightly different depending on the positive and negative electrode materials used, but it is generally between 3.0V and 4.2V. In order to achieve excellent power performance, new energy vehicles currently use a series of batteries to form a high-voltage battery module. For example, several blade batteries (usually dozens or even hundreds) are connected in series to obtain high voltage in the battery packs of several new energy vehicles under the BYD flag. In order to control the temperature of the battery pack, the batteries are tightly bonded together with the cooling plate using thermal conductive adhesive. Most new energy vehicles use similar solutions, which means that if a single battery fails, the entire battery pack will be affected. The entire battery must be replaced, or the battery pack must be disassembled and replaced with a new battery, which is very difficult to disassemble and replace.

[0003] In view of this, the utility model provides a kind of high voltage battery, and the way of pole piece level series parallel hybrid connection is used in single battery, so that single battery maintains voltage stability while obtaining high voltage. When the battery of the utility model is used to build a high-voltage battery module, the number of battery series connection can be greatly reduced, and the series connection of multiple batteries is changed to series-parallel connection in the battery to battery module link, so that the voltage fluctuation of the entire battery pack is smaller. Even if a single battery has defects such as excessive voltage drop, it has little effect on the overall battery pack voltage. Utility model content

[0004] To solve these problems, the utility model provides a high voltage electric core body and a battery and a battery module containing the same, which uses a pole piece level series parallel hybrid connection from the inside of a single battery, fundamentally reduces the impact of a single battery failure on the entire battery module, and improves the voltage stability and service life of the battery module.

[0005] One aspect of the utility model provides a high voltage electric core body, which comprises:

[0006] at least two cell units, each of which is composed of a positive electrode layer, a positive active material layer, at least one bipolar electrode unit, a separation medium layer, a negative active material layer and a negative electrode layer; wherein the bipolar electrode unit is composed of a separation medium layer, a negative active material layer, an intermediate electrode layer and a positive active material layer; a positive electrode connection end, which is composed of all the positive electrode layers in the at least two cell units in parallel; and a negative electrode connection end, which is composed of all the negative electrode layers in the at least two cell units in parallel, the at least two cell units being connected in parallel to form a high-voltage cell body, the voltage of the high-voltage cell body depending on the voltage of the cell units.

[0007] Optionally, the stacking order of the layers in the cell unit is a positive electrode layer, a positive active material layer, at least one bipolar electrode unit, a separation medium layer, a negative active material layer and a negative electrode layer; at this time, the stacking order of the material layers in the bipolar electrode unit is a separation medium layer, a negative active material layer, an intermediate electrode layer and a positive material layer.

[0008] Optionally, the stacking order of the layers in the cell unit is a positive electrode layer, a positive active material layer, a separation medium layer, at least one bipolar electrode unit, a negative active material layer and a negative electrode layer; at this time, the stacking order of the material layers in the bipolar electrode unit is a negative active material layer, an intermediate electrode layer, a positive material layer and a separation medium layer.

[0009] Optionally, each of the material layers in the bipolar electrode unit has a length of 20-1200 mm and a width of 20-300 mm.

[0010] Optionally, the positive electrode layer in the cell unit has a size of 3-30 mm greater than the bipolar electrode unit in at least one of the length direction or the width direction.

[0011] Optionally, the negative electrode layer in the cell unit has a size of 3-30 mm greater than the bipolar electrode unit in at least one of the length direction or the width direction.

[0012] The utility model also provides a battery, its characterized in that, the battery includes any one high-voltage cell body as described above.

[0013] Optionally, the battery is a solid-state battery, and the separation medium layer is a solid-state electrolyte layer.

[0014] Optionally, the battery is a lithium ion battery, and the separation medium layer is a separator layer.

[0015] The utility model also provides a battery module, its characterized in that, the battery module contains the battery as described above.

[0016] The utility model discloses a high voltage battery assembly battery module can greatly reduce the quantity of series connection, reduce the failure rate of battery module performance reduction or failure caused by single battery fault.

[0017] The utility model has at least the following advantages:

[0018] 1, the way of the pole piece level series connection is used in the battery interior to constitute the electric core unit, and the battery voltage can be designed.

[0019] 2, the special design of the stacking order of each layer in the battery interior makes the electron travel short between the positive and negative electrode materials, and large current charging and discharging can be realized.

[0020] 3, the way of multiple electric core units parallel connection is used to constitute the electric core body, and the battery is obtained after encapsulation, and the battery capacity can be designed.

[0021] 4, when the high voltage battery assembly battery module of the utility model is used, the quantity of battery series connection can be greatly reduced, and the battery module failure rate is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a schematic view of the electric core unit in the utility model.

[0023] Figure 2 It is a schematic view of the electric core body of the utility model.

[0024] FIG. No. Explanation:

[0025] 100 electric core body, 10 electric core unit, 11 positive electrode connection end, 12 negative electrode connection end, M bipolar electrode unit, 1 positive electrode layer, 2 positive electrode active material layer, 3 isolation medium layer, 4 negative electrode active material layer, 5 intermediate electrode layer, 6 negative electrode layer. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantage of the utility model more clearly, the following is in combination with the drawings and examples, and the utility model is further explained in detail. It should be understood that the specific examples described here are only used to explain the utility model, and are not used to limit the utility model.

[0027] Reference Figure 1 And Figure 2 , Figure 2Figure 1 is a schematic diagram of a specific embodiment of the electric core body in the utility model. The electric core body 100 in the embodiment is composed of a plurality of electric core units 10 in parallel, and the positive connection end 11 of each electric core unit 10 is connected together, and the negative connection end 12 of each electric core unit 10 is connected together. The standard voltage of the electric core body 100 formed after parallel connection is the same as the voltage of the electric core unit 10.

[0028] Figure 1 Figure 2 is a schematic diagram of a specific embodiment of the electric core unit 10 in the utility model. The electric core unit 10 in the embodiment is composed of a positive electrode layer 1, a positive active material layer 2, a plurality of bipolar electrode units M, a separation medium layer 3, a negative active material layer 4 and a negative electrode layer 6. And each material layer is closely attached. The bipolar electrode unit M is composed of the separation medium layer 3, the negative active material layer 4, the intermediate electrode layer 5 and the positive active material layer 2; the negative active material layer 4 and the positive active material layer 2 are respectively located on the two sides of the intermediate electrode layer 5, and the length and width dimensions of the negative active material layer 4 and the positive active material layer 2 are not greater than the length and width dimensions of the intermediate electrode layer 5. The separation medium layer 3 is located on the side of the negative active material layer 4 away from the intermediate electrode layer 5 and is closely attached to the negative active material layer 4, or the separation medium layer 3 is located on the side of the positive active material layer 2 away from the intermediate electrode layer 5 and is closely attached to the positive active material layer 2.

[0029] Embodiment one

[0030] Adopting as Figure 1The sequence of the material layers in the bipolar electrode unit M is, in order, the separator layer 3, the negative active material layer 4, the intermediate electrode layer 5, and the positive active material layer 2, i.e. the separator layer 3 is located on the side of the negative active material layer 4 away from the intermediate electrode layer 5. The material layers are tightly attached to each other; the length and width of the negative active material layer 4 and the positive active material layer 2 are not greater than the length and width of the intermediate electrode layer 5; the length and width of the separator layer 3 are not less than the length and width of the negative active material layer 4. The battery cell unit 10 comprises N (N is a natural number greater than or equal to 1) bipolar electrode units M, and the sequence of the stacked units is, in order, the positive electrode layer 1, the positive active material layer 2, the first bipolar electrode unit M, the second bipolar electrode unit M, …, the Nth bipolar electrode unit M, the separator layer 3, the negative active material layer 4, and the negative electrode layer 6; the positive active material layer 2 is attached to the separator layer 3 in the first bipolar electrode unit M, the positive active material layer 2 in the first to N-1th bipolar electrode units M is attached to the separator layer 3 in the second to Nth bipolar electrode units, respectively, and the positive active material layer 2 in the Nth bipolar electrode unit M is attached to the separator layer 3 below it. In this embodiment, the positive electrode layer 1 has a size greater than the positive active material layer 2 on at least one side in at least one of the length or width directions; the negative electrode layer 6 has a size greater than the negative active material layer 4 on at least one side in at least one of the length or width directions.

[0031] Example Two

[0032] The sequence of the material layers in the bipolar electrode unit M is, in order, the negative electrode active material layer 4, the intermediate electrode layer 5, the positive electrode active material layer 2, and the isolation medium layer 3, that is, the isolation medium layer 3 is located on the side of the positive electrode active material layer 2 away from the intermediate electrode layer 5. The above-mentioned material layers are tightly attached to each other; the length and width dimensions of the negative electrode active material layer 4 and the positive electrode active material layer 2 are not greater than the length and width dimensions of the intermediate electrode layer 5; and the length and width dimensions of the isolation medium layer 3 are not less than the length and width dimensions of the positive electrode active material layer 2. The battery cell unit 10 comprises N (N is a natural number greater than or equal to 1) of the above-mentioned bipolar electrode units M, and the specific stacking sequence is, in order, the positive electrode layer 1, the positive electrode active material layer 2, the isolation medium layer 3, the first bipolar electrode unit M, the second bipolar electrode unit M, …, the Nth bipolar electrode unit M, the negative electrode active material layer 4, and the negative electrode layer 6; wherein the isolation medium layer 3 is attached to the negative electrode active material layer 4 in the first bipolar electrode unit M, the isolation medium layers 3 in the first to (N-1)th bipolar electrode units M are attached to the negative electrode active material layers 4 in the second to Nth bipolar electrode units, respectively, and the isolation medium layer 3 in the Nth bipolar electrode unit M is attached to the negative electrode active material layer 4 below it. In the embodiment, the positive electrode layer 1 has a dimension greater than that of the positive electrode active material layer 2 on at least one side in at least one of the length or width directions; and the negative electrode layer 6 has a dimension greater than that of the negative electrode active material layer 4 on at least one side in at least one of the length or width directions.

[0033] In the above-mentioned embodiment one and embodiment two, for the convenience of description, only the composition sequence of the bipolar electrode unit M is different, but when the bipolar electrode unit M is stacked to form the battery cell unit 10, the stacking sequence of the material layers in the battery cell unit 10 formed by the embodiment one and the embodiment two is the same, that is, the embodiment one and the embodiment two are essentially the same. Assuming that the standard voltage of the selected positive and negative electrode materials is 3.7 V, then the standard voltage of the battery cell unit 10 in the embodiment is 3.7x(N+1) V, that is, N+1 times the standard voltage of the conventional lithium ion battery produced by the stacking method. By connecting the positive electrode connection ends 11 of the battery cell units 10 to each other and connecting the negative electrode connection ends 12 of the battery cell units 10 to each other through parallel connection of the plurality of battery cell units 10, a battery cell body 100 is formed, and the voltage of the battery cell body is also 3.7x(N+1) V, that is, N+1 times the standard voltage of the conventional battery produced by the stacking method.

[0034] It can be found from the above that the battery cell body 100 provided in the embodiment has the characteristics of high voltage, voltage designability, capacity designability, and the like.

[0035] When the single battery constructed by the battery cell body 100 is used to build a power battery pack, due to the high voltage characteristics of the single battery, the number of series connection between the single batteries can be greatly reduced, and the series connection + parallel connection mode can be formed between the single batteries in the power battery pack.

[0036] The structure of the battery cell body 100 in the utility model is not limited to lithium ion batteries, and can also be applied to solid-state batteries. When the structure of the battery cell body 100 in the utility model is used for lithium ion batteries, the material of the isolation medium layer 3 is a battery separator; when the structure of the battery cell body 100 in the utility model is used for solid-state batteries, the material of the isolation medium layer 3 is a solid-state electrolyte. The positive electrode layer 1, the intermediate electrode layer 5 and the negative electrode layer 6 in the utility model are current collectors, and the material thereof can be copper foil, aluminum foil, carbon-based materials (such as carbon cloth, graphene paper, three-dimensional carbon and carbon nanotubes, etc.), or a combination of the above materials.

[0037] It should be understood that the above description is only a preferred embodiment of the utility model, and is not intended to limit the utility model, and any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A high voltage cell body, characterized by, The high-voltage cell body comprises: at least 2 cell units, each cell unit being composed of a positive electrode layer, a positive active material layer, at least 1 bipolar electrode unit, a separation medium layer, a negative active material layer, and a negative electrode layer; wherein the bipolar electrode unit is composed of a separation medium layer, a negative active material layer, an intermediate electrode layer, and a positive active material layer; a positive electrode connection end, the positive electrode connection end being in parallel connection with all positive electrode layers in the at least 2 cell units; and a negative electrode connection end, the negative electrode connection end being in parallel connection with all negative electrode layers in the at least 2 cell units, the at least 2 cell units are connected in parallel to form a high-voltage cell body, and the voltage of the high-voltage cell body depends on the voltage of the cell units.

2. The high voltage cell body of claim 1, wherein: The stacking order of the layers in the cell unit is a positive electrode layer, a positive active material layer, at least 1 bipolar electrode unit, a separation medium layer, a negative active material layer, and a negative electrode layer; at this time, the stacking order of the material layers in the bipolar electrode unit is a separation medium layer, a negative active material layer, an intermediate electrode layer, and a positive material layer.

3. The high voltage core of claim 1, wherein: The stacking order of the layers in the cell unit is a positive electrode layer, a positive active material layer, a separation medium layer, at least 1 bipolar electrode unit, a negative active material layer, and a negative electrode layer; at this time, the stacking order of the material layers in the bipolar electrode unit is a negative active material layer, an intermediate electrode layer, a positive material layer, and a separation medium layer.

4. The high voltage core of claim 1, wherein: Each material layer in the bipolar electrode unit has a length of 20-1200 mm and a width of 20-300 mm.

5. The high voltage core of claim 1, wherein: The positive electrode layer in the cell unit has a size of 3-30 mm larger than the bipolar electrode unit in at least one of the length direction or the width direction.

6. The high voltage core of claim 1, wherein: The negative electrode layer in the cell unit has a size of 3-30 mm larger than the bipolar electrode unit in at least one of the length direction or the width direction.

7. A battery, characterized by The battery comprises the high-voltage cell body according to any one of claims 1-6.

8. The battery of claim 7, wherein: The battery is a solid-state battery, and the separation medium layer is a solid-state electrolyte layer.

9. The battery of claim 7, wherein: The battery is a lithium ion battery, and the separation medium layer is a separator layer.

10. A battery module, characterized by The battery module comprises the battery according to claim 7.

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